./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem03_label51.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6a47aea7 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label51.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 74edf29578da59b17de672f50e10ed8f88a3850b8ffae9884ae020db50745360 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:50:23,260 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:50:23,265 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:50:23,327 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:50:23,328 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:50:23,334 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:50:23,336 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:50:23,341 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:50:23,347 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:50:23,356 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:50:23,358 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:50:23,360 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:50:23,361 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:50:23,364 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:50:23,367 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:50:23,376 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:50:23,380 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:50:23,381 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:50:23,384 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:50:23,393 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:50:23,397 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:50:23,399 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:50:23,403 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:50:23,405 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:50:23,420 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:50:23,421 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:50:23,422 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:50:23,425 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:50:23,425 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:50:23,427 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:50:23,428 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:50:23,429 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:50:23,432 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:50:23,434 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:50:23,436 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:50:23,436 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:50:23,438 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:50:23,438 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:50:23,438 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:50:23,440 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:50:23,441 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:50:23,442 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 16:50:23,486 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:50:23,486 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:50:23,487 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:50:23,487 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:50:23,488 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:50:23,488 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:50:23,489 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:50:23,489 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:50:23,489 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:50:23,490 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 16:50:23,490 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:50:23,490 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:50:23,490 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 16:50:23,491 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 16:50:23,491 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:50:23,491 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 16:50:23,492 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 16:50:23,492 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 16:50:23,493 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:50:23,493 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:50:23,493 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 16:50:23,494 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:50:23,494 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:50:23,494 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:50:23,495 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:50:23,495 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:50:23,495 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:50:23,495 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:50:23,496 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:50:23,496 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:50:23,496 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:50:23,497 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:50:23,497 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:50:23,497 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:50:23,498 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:50:23,498 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:50:23,498 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 16:50:23,498 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 16:50:23,499 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:50:23,499 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:50:23,499 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:50:23,500 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 74edf29578da59b17de672f50e10ed8f88a3850b8ffae9884ae020db50745360 [2021-11-23 16:50:23,826 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:50:23,863 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:50:23,866 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:50:23,868 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:50:23,869 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:50:23,870 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/eca-rers2012/Problem03_label51.c [2021-11-23 16:50:23,958 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/data/3e914c9b3/c8ed06e792f24e93a9d2dbb200c151c7/FLAG65352e4c0 [2021-11-23 16:50:24,869 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:50:24,870 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/sv-benchmarks/c/eca-rers2012/Problem03_label51.c [2021-11-23 16:50:24,898 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/data/3e914c9b3/c8ed06e792f24e93a9d2dbb200c151c7/FLAG65352e4c0 [2021-11-23 16:50:24,984 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/data/3e914c9b3/c8ed06e792f24e93a9d2dbb200c151c7 [2021-11-23 16:50:24,987 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:50:24,988 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:50:24,990 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:50:24,991 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:50:24,997 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:50:24,998 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:50:24" (1/1) ... [2021-11-23 16:50:24,999 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@682b51b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:24, skipping insertion in model container [2021-11-23 16:50:24,999 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:50:24" (1/1) ... [2021-11-23 16:50:25,008 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:50:25,127 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:50:25,940 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_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/sv-benchmarks/c/eca-rers2012/Problem03_label51.c[59610,59623] [2021-11-23 16:50:25,986 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:50:26,000 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:50:26,337 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_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/sv-benchmarks/c/eca-rers2012/Problem03_label51.c[59610,59623] [2021-11-23 16:50:26,349 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:50:26,375 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:50:26,376 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:26 WrapperNode [2021-11-23 16:50:26,376 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:50:26,377 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:50:26,378 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:50:26,378 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:50:26,387 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:26" (1/1) ... [2021-11-23 16:50:26,452 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:26" (1/1) ... [2021-11-23 16:50:26,583 INFO L137 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 1771 [2021-11-23 16:50:26,584 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:50:26,586 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:50:26,586 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:50:26,586 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:50:26,597 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:26" (1/1) ... [2021-11-23 16:50:26,598 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:26" (1/1) ... [2021-11-23 16:50:26,653 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:26" (1/1) ... [2021-11-23 16:50:26,653 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:26" (1/1) ... [2021-11-23 16:50:26,738 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:26" (1/1) ... [2021-11-23 16:50:26,769 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:26" (1/1) ... [2021-11-23 16:50:26,797 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:26" (1/1) ... [2021-11-23 16:50:26,816 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:50:26,818 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:50:26,818 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:50:26,819 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:50:26,820 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:26" (1/1) ... [2021-11-23 16:50:26,830 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:50:26,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:50:26,865 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:50:26,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:50:26,923 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:50:26,923 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 16:50:26,924 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:50:26,924 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:50:27,065 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:50:27,068 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:50:29,084 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:50:29,126 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 16:50:29,132 INFO L158 Benchmark]: Toolchain (without parser) took 4141.89ms. Allocated memory was 109.1MB in the beginning and 136.3MB in the end (delta: 27.3MB). Free memory was 71.5MB in the beginning and 52.4MB in the end (delta: 19.2MB). Peak memory consumption was 66.0MB. Max. memory is 16.1GB. [2021-11-23 16:50:29,133 INFO L158 Benchmark]: CDTParser took 0.36ms. Allocated memory is still 109.1MB. Free memory was 62.3MB in the beginning and 62.3MB in the end (delta: 84.1kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 16:50:29,134 INFO L158 Benchmark]: CACSL2BoogieTranslator took 1386.04ms. Allocated memory was 109.1MB in the beginning and 136.3MB in the end (delta: 27.3MB). Free memory was 71.5MB in the beginning and 60.1MB in the end (delta: 11.4MB). Peak memory consumption was 37.7MB. Max. memory is 16.1GB. [2021-11-23 16:50:29,135 INFO L158 Benchmark]: Boogie Procedure Inliner took 207.62ms. Allocated memory is still 136.3MB. Free memory was 60.1MB in the beginning and 45.5MB in the end (delta: 14.7MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. [2021-11-23 16:50:29,136 INFO L158 Benchmark]: Boogie Preprocessor took 230.90ms. Allocated memory is still 136.3MB. Free memory was 45.5MB in the beginning and 93.6MB in the end (delta: -48.1MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. [2021-11-23 16:50:29,137 INFO L158 Benchmark]: RCFGBuilder took 2311.28ms. Allocated memory is still 136.3MB. Free memory was 93.6MB in the beginning and 52.4MB in the end (delta: 41.2MB). Peak memory consumption was 61.0MB. Max. memory is 16.1GB. [2021-11-23 16:50:29,141 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.36ms. Allocated memory is still 109.1MB. Free memory was 62.3MB in the beginning and 62.3MB in the end (delta: 84.1kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 1386.04ms. Allocated memory was 109.1MB in the beginning and 136.3MB in the end (delta: 27.3MB). Free memory was 71.5MB in the beginning and 60.1MB in the end (delta: 11.4MB). Peak memory consumption was 37.7MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 207.62ms. Allocated memory is still 136.3MB. Free memory was 60.1MB in the beginning and 45.5MB in the end (delta: 14.7MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. * Boogie Preprocessor took 230.90ms. Allocated memory is still 136.3MB. Free memory was 45.5MB in the beginning and 93.6MB in the end (delta: -48.1MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. * RCFGBuilder took 2311.28ms. Allocated memory is still 136.3MB. Free memory was 93.6MB in the beginning and 52.4MB in the end (delta: 41.2MB). Peak memory consumption was 61.0MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 16:50:29,205 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label51.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 74edf29578da59b17de672f50e10ed8f88a3850b8ffae9884ae020db50745360 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:50:32,198 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:50:32,202 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:50:32,274 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:50:32,275 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:50:32,276 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:50:32,279 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:50:32,281 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:50:32,284 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:50:32,294 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:50:32,295 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:50:32,297 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:50:32,297 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:50:32,299 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:50:32,301 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:50:32,302 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:50:32,304 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:50:32,311 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:50:32,314 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:50:32,325 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:50:32,327 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:50:32,332 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:50:32,337 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:50:32,339 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:50:32,343 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:50:32,344 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:50:32,344 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:50:32,345 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:50:32,346 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:50:32,348 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:50:32,348 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:50:32,359 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:50:32,361 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:50:32,362 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:50:32,364 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:50:32,365 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:50:32,366 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:50:32,366 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:50:32,366 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:50:32,369 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:50:32,370 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:50:32,371 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 16:50:32,444 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:50:32,445 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:50:32,446 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:50:32,446 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:50:32,447 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:50:32,447 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:50:32,448 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:50:32,448 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:50:32,448 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:50:32,448 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:50:32,450 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:50:32,450 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:50:32,452 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:50:32,452 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:50:32,453 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:50:32,453 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:50:32,453 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:50:32,453 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:50:32,454 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:50:32,454 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 16:50:32,454 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 16:50:32,454 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 16:50:32,455 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:50:32,455 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:50:32,455 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:50:32,455 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:50:32,456 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:50:32,456 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 16:50:32,456 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:50:32,456 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:50:32,457 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:50:32,457 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:50:32,458 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:50:32,458 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 16:50:32,458 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 16:50:32,458 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:50:32,459 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:50:32,459 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:50:32,459 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 74edf29578da59b17de672f50e10ed8f88a3850b8ffae9884ae020db50745360 [2021-11-23 16:50:32,950 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:50:32,981 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:50:32,984 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:50:32,986 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:50:32,987 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:50:32,989 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/eca-rers2012/Problem03_label51.c [2021-11-23 16:50:33,068 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/data/c4334c892/4e639c3bd12046418effb5dd656cb0c5/FLAGac8b804d2 [2021-11-23 16:50:34,048 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:50:34,049 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/sv-benchmarks/c/eca-rers2012/Problem03_label51.c [2021-11-23 16:50:34,080 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/data/c4334c892/4e639c3bd12046418effb5dd656cb0c5/FLAGac8b804d2 [2021-11-23 16:50:34,137 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/data/c4334c892/4e639c3bd12046418effb5dd656cb0c5 [2021-11-23 16:50:34,152 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:50:34,154 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:50:34,159 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:50:34,159 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:50:34,164 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:50:34,166 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:50:34" (1/1) ... [2021-11-23 16:50:34,167 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6cf04551 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:34, skipping insertion in model container [2021-11-23 16:50:34,167 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:50:34" (1/1) ... [2021-11-23 16:50:34,177 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:50:34,289 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:50:35,118 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_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/sv-benchmarks/c/eca-rers2012/Problem03_label51.c[59610,59623] [2021-11-23 16:50:35,154 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:50:35,169 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:50:35,539 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_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/sv-benchmarks/c/eca-rers2012/Problem03_label51.c[59610,59623] [2021-11-23 16:50:35,550 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:50:35,575 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:50:35,575 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:35 WrapperNode [2021-11-23 16:50:35,576 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:50:35,577 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:50:35,577 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:50:35,577 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:50:35,586 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:35" (1/1) ... [2021-11-23 16:50:35,632 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:35" (1/1) ... [2021-11-23 16:50:35,824 INFO L137 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 1769 [2021-11-23 16:50:35,825 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:50:35,826 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:50:35,827 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:50:35,827 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:50:35,838 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:35" (1/1) ... [2021-11-23 16:50:35,838 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:35" (1/1) ... [2021-11-23 16:50:35,867 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:35" (1/1) ... [2021-11-23 16:50:35,867 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:35" (1/1) ... [2021-11-23 16:50:35,951 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:35" (1/1) ... [2021-11-23 16:50:35,983 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:35" (1/1) ... [2021-11-23 16:50:35,999 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:35" (1/1) ... [2021-11-23 16:50:36,016 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:50:36,018 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:50:36,019 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:50:36,020 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:50:36,025 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:35" (1/1) ... [2021-11-23 16:50:36,034 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:50:36,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:50:36,066 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:50:36,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:50:36,150 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:50:36,150 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 16:50:36,153 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:50:36,153 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:50:36,285 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:50:36,287 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:50:39,235 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:50:39,260 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 16:50:39,260 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 16:50:39,265 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:50:39 BoogieIcfgContainer [2021-11-23 16:50:39,265 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 16:50:39,269 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 16:50:39,269 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 16:50:39,273 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 16:50:39,274 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 04:50:34" (1/3) ... [2021-11-23 16:50:39,275 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2312091 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:50:39, skipping insertion in model container [2021-11-23 16:50:39,275 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:35" (2/3) ... [2021-11-23 16:50:39,275 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2312091 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:50:39, skipping insertion in model container [2021-11-23 16:50:39,276 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:50:39" (3/3) ... [2021-11-23 16:50:39,278 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem03_label51.c [2021-11-23 16:50:39,286 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 16:50:39,286 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 16:50:39,370 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 16:50:39,383 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=FINITE_AUTOMATA, 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 [2021-11-23 16:50:39,383 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 16:50:39,425 INFO L276 IsEmpty]: Start isEmpty. Operand has 302 states, 300 states have (on average 1.73) internal successors, (519), 301 states have internal predecessors, (519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:39,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-11-23 16:50:39,469 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:39,470 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:50:39,471 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:39,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:39,479 INFO L85 PathProgramCache]: Analyzing trace with hash 951431538, now seen corresponding path program 1 times [2021-11-23 16:50:39,501 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:39,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1409794914] [2021-11-23 16:50:39,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:39,504 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:39,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:39,508 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:39,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 16:50:39,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:39,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 16:50:39,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:59,710 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:59,711 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:59,712 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:59,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1409794914] [2021-11-23 16:50:59,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1409794914] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:59,713 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:59,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 16:50:59,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149426390] [2021-11-23 16:50:59,716 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:59,722 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 16:50:59,723 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:59,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 16:50:59,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-23 16:50:59,759 INFO L87 Difference]: Start difference. First operand has 302 states, 300 states have (on average 1.73) internal successors, (519), 301 states have internal predecessors, (519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 9 states, 9 states have (on average 20.88888888888889) internal successors, (188), 8 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:05,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:05,288 INFO L93 Difference]: Finished difference Result 718 states and 1265 transitions. [2021-11-23 16:51:05,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 16:51:05,291 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 20.88888888888889) internal successors, (188), 8 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 188 [2021-11-23 16:51:05,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:05,307 INFO L225 Difference]: With dead ends: 718 [2021-11-23 16:51:05,308 INFO L226 Difference]: Without dead ends: 352 [2021-11-23 16:51:05,313 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=62, Invalid=120, Unknown=0, NotChecked=0, Total=182 [2021-11-23 16:51:05,317 INFO L933 BasicCegarLoop]: 339 mSDtfsCounter, 431 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 2341 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 431 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 2445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 2341 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:05,319 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [431 Valid, 464 Invalid, 2445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 2341 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2021-11-23 16:51:05,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2021-11-23 16:51:05,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 352. [2021-11-23 16:51:05,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 352 states, 351 states have (on average 1.4586894586894588) internal successors, (512), 351 states have internal predecessors, (512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:05,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 512 transitions. [2021-11-23 16:51:05,389 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 512 transitions. Word has length 188 [2021-11-23 16:51:05,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:05,391 INFO L470 AbstractCegarLoop]: Abstraction has 352 states and 512 transitions. [2021-11-23 16:51:05,391 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 20.88888888888889) internal successors, (188), 8 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:05,391 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 512 transitions. [2021-11-23 16:51:05,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2021-11-23 16:51:05,396 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:05,396 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:05,409 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2021-11-23 16:51:05,601 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:05,602 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:05,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:05,605 INFO L85 PathProgramCache]: Analyzing trace with hash -1302577763, now seen corresponding path program 1 times [2021-11-23 16:51:05,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:05,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [808107084] [2021-11-23 16:51:05,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:05,641 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:05,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:05,651 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:05,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 16:51:05,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:05,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 16:51:05,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:28,342 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:28,343 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:28,343 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:28,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [808107084] [2021-11-23 16:51:28,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [808107084] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:28,344 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:28,345 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-23 16:51:28,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811336982] [2021-11-23 16:51:28,351 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:28,353 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 16:51:28,354 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:28,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 16:51:28,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-23 16:51:28,355 INFO L87 Difference]: Start difference. First operand 352 states and 512 transitions. Second operand has 11 states, 11 states have (on average 17.727272727272727) internal successors, (195), 10 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:37,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:37,400 INFO L93 Difference]: Finished difference Result 1139 states and 1872 transitions. [2021-11-23 16:51:37,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 16:51:37,401 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 17.727272727272727) internal successors, (195), 10 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 195 [2021-11-23 16:51:37,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:37,409 INFO L225 Difference]: With dead ends: 1139 [2021-11-23 16:51:37,409 INFO L226 Difference]: Without dead ends: 902 [2021-11-23 16:51:37,411 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=73, Invalid=137, Unknown=0, NotChecked=0, Total=210 [2021-11-23 16:51:37,412 INFO L933 BasicCegarLoop]: 189 mSDtfsCounter, 1374 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 5023 mSolverCounterSat, 249 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1374 SdHoareTripleChecker+Valid, 372 SdHoareTripleChecker+Invalid, 5272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 249 IncrementalHoareTripleChecker+Valid, 5023 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:37,413 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1374 Valid, 372 Invalid, 5272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [249 Valid, 5023 Invalid, 0 Unknown, 0 Unchecked, 8.3s Time] [2021-11-23 16:51:37,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 902 states. [2021-11-23 16:51:37,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 902 to 899. [2021-11-23 16:51:37,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 899 states, 898 states have (on average 1.2360801781737194) internal successors, (1110), 898 states have internal predecessors, (1110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:37,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 899 states to 899 states and 1110 transitions. [2021-11-23 16:51:37,475 INFO L78 Accepts]: Start accepts. Automaton has 899 states and 1110 transitions. Word has length 195 [2021-11-23 16:51:37,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:37,476 INFO L470 AbstractCegarLoop]: Abstraction has 899 states and 1110 transitions. [2021-11-23 16:51:37,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 17.727272727272727) internal successors, (195), 10 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:37,477 INFO L276 IsEmpty]: Start isEmpty. Operand 899 states and 1110 transitions. [2021-11-23 16:51:37,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2021-11-23 16:51:37,480 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:37,481 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:37,505 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:37,693 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:37,694 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:37,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:37,694 INFO L85 PathProgramCache]: Analyzing trace with hash 1802692540, now seen corresponding path program 1 times [2021-11-23 16:51:37,701 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:37,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1511096129] [2021-11-23 16:51:37,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:37,702 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:37,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:37,704 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:37,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 16:51:37,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:37,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:51:37,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:41,982 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:51:41,982 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:41,983 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:41,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1511096129] [2021-11-23 16:51:41,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1511096129] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:41,983 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:41,983 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:51:41,984 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966690274] [2021-11-23 16:51:41,984 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:41,985 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:51:41,985 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:41,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:51:41,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:51:41,986 INFO L87 Difference]: Start difference. First operand 899 states and 1110 transitions. Second operand has 4 states, 4 states have (on average 49.5) internal successors, (198), 3 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:43,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:43,534 INFO L93 Difference]: Finished difference Result 1310 states and 1812 transitions. [2021-11-23 16:51:43,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:51:43,542 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 49.5) internal successors, (198), 3 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 203 [2021-11-23 16:51:43,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:43,549 INFO L225 Difference]: With dead ends: 1310 [2021-11-23 16:51:43,549 INFO L226 Difference]: Without dead ends: 887 [2021-11-23 16:51:43,551 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:51:43,554 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 354 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 849 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 354 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 1015 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 849 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:43,556 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [354 Valid, 78 Invalid, 1015 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 849 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-23 16:51:43,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 887 states. [2021-11-23 16:51:43,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 887 to 887. [2021-11-23 16:51:43,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 887 states, 886 states have (on average 1.1997742663656885) internal successors, (1063), 886 states have internal predecessors, (1063), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:43,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 887 states to 887 states and 1063 transitions. [2021-11-23 16:51:43,597 INFO L78 Accepts]: Start accepts. Automaton has 887 states and 1063 transitions. Word has length 203 [2021-11-23 16:51:43,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:43,598 INFO L470 AbstractCegarLoop]: Abstraction has 887 states and 1063 transitions. [2021-11-23 16:51:43,598 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 49.5) internal successors, (198), 3 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:43,598 INFO L276 IsEmpty]: Start isEmpty. Operand 887 states and 1063 transitions. [2021-11-23 16:51:43,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2021-11-23 16:51:43,603 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:43,604 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:43,618 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:43,816 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:43,816 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:43,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:43,817 INFO L85 PathProgramCache]: Analyzing trace with hash -1209124904, now seen corresponding path program 1 times [2021-11-23 16:51:43,819 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:43,819 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [576606484] [2021-11-23 16:51:43,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:43,819 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:43,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:43,820 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:43,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 16:51:43,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:43,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:51:43,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:44,328 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:44,328 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:44,328 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:44,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [576606484] [2021-11-23 16:51:44,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [576606484] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:44,328 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:44,328 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:51:44,329 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374465978] [2021-11-23 16:51:44,329 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:44,329 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:51:44,329 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:44,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:51:44,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:44,331 INFO L87 Difference]: Start difference. First operand 887 states and 1063 transitions. Second operand has 3 states, 3 states have (on average 72.0) internal successors, (216), 2 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:45,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:45,800 INFO L93 Difference]: Finished difference Result 1330 states and 1741 transitions. [2021-11-23 16:51:45,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:51:45,801 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 72.0) internal successors, (216), 2 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 216 [2021-11-23 16:51:45,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:45,806 INFO L225 Difference]: With dead ends: 1330 [2021-11-23 16:51:45,806 INFO L226 Difference]: Without dead ends: 687 [2021-11-23 16:51:45,808 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 214 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:45,809 INFO L933 BasicCegarLoop]: 160 mSDtfsCounter, 189 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 559 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 650 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 559 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:45,809 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [189 Valid, 192 Invalid, 650 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 559 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-23 16:51:45,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 687 states. [2021-11-23 16:51:45,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 687 to 684. [2021-11-23 16:51:45,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 684 states, 683 states have (on average 1.225475841874085) internal successors, (837), 683 states have internal predecessors, (837), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:45,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 684 states to 684 states and 837 transitions. [2021-11-23 16:51:45,832 INFO L78 Accepts]: Start accepts. Automaton has 684 states and 837 transitions. Word has length 216 [2021-11-23 16:51:45,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:45,832 INFO L470 AbstractCegarLoop]: Abstraction has 684 states and 837 transitions. [2021-11-23 16:51:45,833 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 72.0) internal successors, (216), 2 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:45,833 INFO L276 IsEmpty]: Start isEmpty. Operand 684 states and 837 transitions. [2021-11-23 16:51:45,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2021-11-23 16:51:45,837 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:45,837 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:45,849 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Ended with exit code 0 [2021-11-23 16:51:46,049 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:46,051 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:46,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:46,052 INFO L85 PathProgramCache]: Analyzing trace with hash 888630209, now seen corresponding path program 1 times [2021-11-23 16:51:46,054 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:46,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1466644217] [2021-11-23 16:51:46,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:46,055 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:46,060 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:46,061 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:46,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 16:51:46,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:46,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:51:46,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:50,564 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 30 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:50,564 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:50,564 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:50,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1466644217] [2021-11-23 16:51:50,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1466644217] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:50,576 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:50,576 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:51:50,576 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587525104] [2021-11-23 16:51:50,577 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:50,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:51:50,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:50,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:51:50,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:51:50,578 INFO L87 Difference]: Start difference. First operand 684 states and 837 transitions. Second operand has 4 states, 4 states have (on average 54.75) internal successors, (219), 3 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:52,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:52,498 INFO L93 Difference]: Finished difference Result 1711 states and 2262 transitions. [2021-11-23 16:51:52,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:51:52,499 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 54.75) internal successors, (219), 3 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 219 [2021-11-23 16:51:52,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:52,506 INFO L225 Difference]: With dead ends: 1711 [2021-11-23 16:51:52,506 INFO L226 Difference]: Without dead ends: 1097 [2021-11-23 16:51:52,507 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 216 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:51:52,508 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 273 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 1060 mSolverCounterSat, 216 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 1276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 216 IncrementalHoareTripleChecker+Valid, 1060 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:52,509 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [273 Valid, 166 Invalid, 1276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [216 Valid, 1060 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-23 16:51:52,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1097 states. [2021-11-23 16:51:52,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1097 to 1096. [2021-11-23 16:51:52,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1096 states, 1095 states have (on average 1.2264840182648402) internal successors, (1343), 1095 states have internal predecessors, (1343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:52,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1096 states to 1096 states and 1343 transitions. [2021-11-23 16:51:52,540 INFO L78 Accepts]: Start accepts. Automaton has 1096 states and 1343 transitions. Word has length 219 [2021-11-23 16:51:52,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:52,540 INFO L470 AbstractCegarLoop]: Abstraction has 1096 states and 1343 transitions. [2021-11-23 16:51:52,541 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 54.75) internal successors, (219), 3 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:52,541 INFO L276 IsEmpty]: Start isEmpty. Operand 1096 states and 1343 transitions. [2021-11-23 16:51:52,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2021-11-23 16:51:52,546 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:52,547 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:51:52,565 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:52,768 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:52,769 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:52,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:52,769 INFO L85 PathProgramCache]: Analyzing trace with hash 13432839, now seen corresponding path program 1 times [2021-11-23 16:51:52,771 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:52,771 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [569870295] [2021-11-23 16:51:52,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:52,772 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:52,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:52,772 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:52,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 16:51:52,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:52,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 16:51:52,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:17,415 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 39 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:17,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:01,115 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 2 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:01,115 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:01,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [569870295] [2021-11-23 16:53:01,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [569870295] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:01,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1194122979] [2021-11-23 16:53:01,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:01,116 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:01,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:53:01,118 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:53:01,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (8)] Waiting until timeout for monitored process [2021-11-23 16:53:01,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:01,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:53:01,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:01,961 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 95 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:01,961 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:53:01,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1194122979] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:53:01,962 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:53:01,962 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [10, 10] total 20 [2021-11-23 16:53:01,962 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407278842] [2021-11-23 16:53:01,962 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:53:01,963 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:53:01,963 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:01,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:53:01,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:53:01,967 INFO L87 Difference]: Start difference. First operand 1096 states and 1343 transitions. Second operand has 3 states, 3 states have (on average 94.66666666666667) internal successors, (284), 3 states have internal predecessors, (284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:03,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:03,116 INFO L93 Difference]: Finished difference Result 2775 states and 3498 transitions. [2021-11-23 16:53:03,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:53:03,117 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 94.66666666666667) internal successors, (284), 3 states have internal predecessors, (284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 284 [2021-11-23 16:53:03,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:03,128 INFO L225 Difference]: With dead ends: 2775 [2021-11-23 16:53:03,128 INFO L226 Difference]: Without dead ends: 1923 [2021-11-23 16:53:03,130 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 849 GetRequests, 831 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:53:03,131 INFO L933 BasicCegarLoop]: 246 mSDtfsCounter, 81 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 529 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 648 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 529 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:03,132 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 271 Invalid, 648 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 529 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 16:53:03,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1923 states. [2021-11-23 16:53:03,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1923 to 1922. [2021-11-23 16:53:03,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1922 states, 1921 states have (on average 1.194169703279542) internal successors, (2294), 1921 states have internal predecessors, (2294), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:03,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1922 states to 1922 states and 2294 transitions. [2021-11-23 16:53:03,184 INFO L78 Accepts]: Start accepts. Automaton has 1922 states and 2294 transitions. Word has length 284 [2021-11-23 16:53:03,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:03,185 INFO L470 AbstractCegarLoop]: Abstraction has 1922 states and 2294 transitions. [2021-11-23 16:53:03,186 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 94.66666666666667) internal successors, (284), 3 states have internal predecessors, (284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:03,186 INFO L276 IsEmpty]: Start isEmpty. Operand 1922 states and 2294 transitions. [2021-11-23 16:53:03,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2021-11-23 16:53:03,194 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:03,195 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:53:03,212 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:03,414 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (8)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:03,609 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:03,609 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:03,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:03,609 INFO L85 PathProgramCache]: Analyzing trace with hash 1280797368, now seen corresponding path program 1 times [2021-11-23 16:53:03,611 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:03,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [831232526] [2021-11-23 16:53:03,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:03,612 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:03,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:03,613 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:03,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 16:53:03,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:03,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 16:53:03,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:26,891 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 21 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:26,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:17,866 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 2 proven. 99 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:17,866 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:17,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [831232526] [2021-11-23 16:54:17,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [831232526] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:17,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1176424595] [2021-11-23 16:54:17,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:17,867 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:54:17,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:54:17,870 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:54:17,873 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-11-23 16:54:18,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:18,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:54:18,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:18,634 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 101 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:18,634 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:54:18,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1176424595] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:54:18,634 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:54:18,635 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [9, 9] total 19 [2021-11-23 16:54:18,635 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791495143] [2021-11-23 16:54:18,635 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:54:18,635 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:54:18,636 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:18,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:54:18,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=246, Unknown=0, NotChecked=0, Total=342 [2021-11-23 16:54:18,637 INFO L87 Difference]: Start difference. First operand 1922 states and 2294 transitions. Second operand has 3 states, 3 states have (on average 96.66666666666667) internal successors, (290), 3 states have internal predecessors, (290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:20,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:20,105 INFO L93 Difference]: Finished difference Result 5235 states and 6333 transitions. [2021-11-23 16:54:20,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:54:20,106 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 96.66666666666667) internal successors, (290), 3 states have internal predecessors, (290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 290 [2021-11-23 16:54:20,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:20,127 INFO L225 Difference]: With dead ends: 5235 [2021-11-23 16:54:20,128 INFO L226 Difference]: Without dead ends: 3557 [2021-11-23 16:54:20,131 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 867 GetRequests, 850 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=96, Invalid=246, Unknown=0, NotChecked=0, Total=342 [2021-11-23 16:54:20,132 INFO L933 BasicCegarLoop]: 228 mSDtfsCounter, 51 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 555 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 655 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 555 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:20,133 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 259 Invalid, 655 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 555 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-23 16:54:20,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3557 states. [2021-11-23 16:54:20,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3557 to 3554. [2021-11-23 16:54:20,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3554 states, 3553 states have (on average 1.1730931607092598) internal successors, (4168), 3553 states have internal predecessors, (4168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:20,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3554 states to 3554 states and 4168 transitions. [2021-11-23 16:54:20,252 INFO L78 Accepts]: Start accepts. Automaton has 3554 states and 4168 transitions. Word has length 290 [2021-11-23 16:54:20,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:20,253 INFO L470 AbstractCegarLoop]: Abstraction has 3554 states and 4168 transitions. [2021-11-23 16:54:20,254 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 96.66666666666667) internal successors, (290), 3 states have internal predecessors, (290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:20,254 INFO L276 IsEmpty]: Start isEmpty. Operand 3554 states and 4168 transitions. [2021-11-23 16:54:20,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2021-11-23 16:54:20,264 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:20,265 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:54:20,276 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:20,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:20,676 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:54:20,676 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:20,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:20,677 INFO L85 PathProgramCache]: Analyzing trace with hash 355292115, now seen corresponding path program 1 times [2021-11-23 16:54:20,679 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:20,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1725890509] [2021-11-23 16:54:20,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:20,680 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:20,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:20,680 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:20,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 16:54:20,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:20,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:54:20,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:21,589 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 99 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:54:21,589 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:54:21,590 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:21,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1725890509] [2021-11-23 16:54:21,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1725890509] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:54:21,590 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:54:21,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:54:21,591 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77762906] [2021-11-23 16:54:21,591 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:54:21,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:54:21,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:21,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:54:21,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:54:21,592 INFO L87 Difference]: Start difference. First operand 3554 states and 4168 transitions. Second operand has 3 states, 3 states have (on average 96.0) internal successors, (288), 2 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:22,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:22,834 INFO L93 Difference]: Finished difference Result 9923 states and 11743 transitions. [2021-11-23 16:54:22,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:54:22,834 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 96.0) internal successors, (288), 2 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 290 [2021-11-23 16:54:22,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:22,864 INFO L225 Difference]: With dead ends: 9923 [2021-11-23 16:54:22,865 INFO L226 Difference]: Without dead ends: 6613 [2021-11-23 16:54:22,870 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 288 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:54:22,871 INFO L933 BasicCegarLoop]: 203 mSDtfsCounter, 130 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 625 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 691 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 625 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:22,871 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 226 Invalid, 691 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 625 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-23 16:54:22,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6613 states. [2021-11-23 16:54:23,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6613 to 6601. [2021-11-23 16:54:23,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6601 states, 6600 states have (on average 1.143939393939394) internal successors, (7550), 6600 states have internal predecessors, (7550), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:23,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6601 states to 6601 states and 7550 transitions. [2021-11-23 16:54:23,037 INFO L78 Accepts]: Start accepts. Automaton has 6601 states and 7550 transitions. Word has length 290 [2021-11-23 16:54:23,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:23,038 INFO L470 AbstractCegarLoop]: Abstraction has 6601 states and 7550 transitions. [2021-11-23 16:54:23,038 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 96.0) internal successors, (288), 2 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:23,039 INFO L276 IsEmpty]: Start isEmpty. Operand 6601 states and 7550 transitions. [2021-11-23 16:54:23,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 312 [2021-11-23 16:54:23,051 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:23,052 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:54:23,069 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:23,264 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:54:23,265 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:23,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:23,265 INFO L85 PathProgramCache]: Analyzing trace with hash -1840359658, now seen corresponding path program 1 times [2021-11-23 16:54:23,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:23,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2009966999] [2021-11-23 16:54:23,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:23,268 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:23,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:23,269 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:23,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 16:54:23,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:23,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:54:23,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:23,820 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 148 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:23,820 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:54:23,820 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:23,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2009966999] [2021-11-23 16:54:23,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2009966999] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:54:23,821 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:54:23,821 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:54:23,821 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269274095] [2021-11-23 16:54:23,821 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:54:23,822 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:54:23,822 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:23,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:54:23,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:54:23,823 INFO L87 Difference]: Start difference. First operand 6601 states and 7550 transitions. Second operand has 3 states, 3 states have (on average 103.66666666666667) internal successors, (311), 3 states have internal predecessors, (311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:24,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:24,950 INFO L93 Difference]: Finished difference Result 12758 states and 14646 transitions. [2021-11-23 16:54:24,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:54:24,951 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 103.66666666666667) internal successors, (311), 3 states have internal predecessors, (311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 311 [2021-11-23 16:54:24,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:24,973 INFO L225 Difference]: With dead ends: 12758 [2021-11-23 16:54:24,973 INFO L226 Difference]: Without dead ends: 6401 [2021-11-23 16:54:24,980 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 309 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:54:24,981 INFO L933 BasicCegarLoop]: 257 mSDtfsCounter, 241 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 549 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 281 SdHoareTripleChecker+Invalid, 619 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 549 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:24,981 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [241 Valid, 281 Invalid, 619 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 549 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 16:54:24,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6401 states. [2021-11-23 16:54:25,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6401 to 6398. [2021-11-23 16:54:25,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6398 states, 6397 states have (on average 1.113647022041582) internal successors, (7124), 6397 states have internal predecessors, (7124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:25,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6398 states to 6398 states and 7124 transitions. [2021-11-23 16:54:25,152 INFO L78 Accepts]: Start accepts. Automaton has 6398 states and 7124 transitions. Word has length 311 [2021-11-23 16:54:25,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:25,153 INFO L470 AbstractCegarLoop]: Abstraction has 6398 states and 7124 transitions. [2021-11-23 16:54:25,153 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 103.66666666666667) internal successors, (311), 3 states have internal predecessors, (311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:25,153 INFO L276 IsEmpty]: Start isEmpty. Operand 6398 states and 7124 transitions. [2021-11-23 16:54:25,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2021-11-23 16:54:25,168 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:25,169 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:54:25,185 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:25,381 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:54:25,382 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:25,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:25,383 INFO L85 PathProgramCache]: Analyzing trace with hash 805326339, now seen corresponding path program 1 times [2021-11-23 16:54:25,386 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:25,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [716530223] [2021-11-23 16:54:25,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:25,387 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:25,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:25,389 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:25,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 16:54:25,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:25,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:54:25,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:25,898 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 130 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 16:54:25,899 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:54:25,899 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:25,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [716530223] [2021-11-23 16:54:25,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [716530223] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:54:25,899 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:54:25,899 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:54:25,899 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451551148] [2021-11-23 16:54:25,899 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:54:25,900 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:54:25,900 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:25,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:54:25,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:54:25,901 INFO L87 Difference]: Start difference. First operand 6398 states and 7124 transitions. Second operand has 3 states, 3 states have (on average 97.33333333333333) internal successors, (292), 3 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:27,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:27,066 INFO L93 Difference]: Finished difference Result 15803 states and 17833 transitions. [2021-11-23 16:54:27,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:54:27,067 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 97.33333333333333) internal successors, (292), 3 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 314 [2021-11-23 16:54:27,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:27,106 INFO L225 Difference]: With dead ends: 15803 [2021-11-23 16:54:27,106 INFO L226 Difference]: Without dead ends: 9649 [2021-11-23 16:54:27,114 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 312 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:54:27,115 INFO L933 BasicCegarLoop]: 360 mSDtfsCounter, 232 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 527 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 232 SdHoareTripleChecker+Valid, 388 SdHoareTripleChecker+Invalid, 642 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 527 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:27,116 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [232 Valid, 388 Invalid, 642 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 527 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 16:54:27,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9649 states. [2021-11-23 16:54:27,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9649 to 9646. [2021-11-23 16:54:27,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9646 states, 9645 states have (on average 1.0965266977708656) internal successors, (10576), 9645 states have internal predecessors, (10576), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:27,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9646 states to 9646 states and 10576 transitions. [2021-11-23 16:54:27,345 INFO L78 Accepts]: Start accepts. Automaton has 9646 states and 10576 transitions. Word has length 314 [2021-11-23 16:54:27,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:27,346 INFO L470 AbstractCegarLoop]: Abstraction has 9646 states and 10576 transitions. [2021-11-23 16:54:27,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 97.33333333333333) internal successors, (292), 3 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:27,347 INFO L276 IsEmpty]: Start isEmpty. Operand 9646 states and 10576 transitions. [2021-11-23 16:54:27,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2021-11-23 16:54:27,364 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:27,365 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:54:27,377 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:27,576 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:54:27,578 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:27,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:27,578 INFO L85 PathProgramCache]: Analyzing trace with hash -768612039, now seen corresponding path program 1 times [2021-11-23 16:54:27,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:27,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2063140354] [2021-11-23 16:54:27,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:27,580 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:27,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:27,581 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:27,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 16:54:27,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:27,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:54:27,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:28,250 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 131 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 16:54:28,250 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:54:28,250 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:28,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2063140354] [2021-11-23 16:54:28,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2063140354] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:54:28,250 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:54:28,251 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:54:28,251 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109019876] [2021-11-23 16:54:28,251 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:54:28,251 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:54:28,251 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:28,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:54:28,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:54:28,253 INFO L87 Difference]: Start difference. First operand 9646 states and 10576 transitions. Second operand has 3 states, 3 states have (on average 97.33333333333333) internal successors, (292), 2 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:29,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:29,628 INFO L93 Difference]: Finished difference Result 19049 states and 20907 transitions. [2021-11-23 16:54:29,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:54:29,629 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 97.33333333333333) internal successors, (292), 2 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 320 [2021-11-23 16:54:29,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:29,646 INFO L225 Difference]: With dead ends: 19049 [2021-11-23 16:54:29,647 INFO L226 Difference]: Without dead ends: 9647 [2021-11-23 16:54:29,652 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:54:29,652 INFO L933 BasicCegarLoop]: 186 mSDtfsCounter, 160 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 568 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 627 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 568 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:29,653 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [160 Valid, 211 Invalid, 627 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 568 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-23 16:54:29,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9647 states. [2021-11-23 16:54:29,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9647 to 9646. [2021-11-23 16:54:29,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9646 states, 9645 states have (on average 1.0823224468636599) internal successors, (10439), 9645 states have internal predecessors, (10439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:29,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9646 states to 9646 states and 10439 transitions. [2021-11-23 16:54:29,785 INFO L78 Accepts]: Start accepts. Automaton has 9646 states and 10439 transitions. Word has length 320 [2021-11-23 16:54:29,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:29,786 INFO L470 AbstractCegarLoop]: Abstraction has 9646 states and 10439 transitions. [2021-11-23 16:54:29,786 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 97.33333333333333) internal successors, (292), 2 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:29,786 INFO L276 IsEmpty]: Start isEmpty. Operand 9646 states and 10439 transitions. [2021-11-23 16:54:29,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 342 [2021-11-23 16:54:29,805 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:29,806 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:54:29,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:30,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:54:30,018 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:30,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:30,019 INFO L85 PathProgramCache]: Analyzing trace with hash -812241996, now seen corresponding path program 1 times [2021-11-23 16:54:30,021 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:30,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1748917458] [2021-11-23 16:54:30,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:30,021 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:30,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:30,025 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:30,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 16:54:30,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:30,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:54:30,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:31,033 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 159 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:54:31,033 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:54:31,034 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:31,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1748917458] [2021-11-23 16:54:31,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1748917458] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:54:31,034 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:54:31,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:54:31,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373369496] [2021-11-23 16:54:31,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:54:31,035 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:54:31,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:31,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:54:31,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:54:31,035 INFO L87 Difference]: Start difference. First operand 9646 states and 10439 transitions. Second operand has 4 states, 4 states have (on average 84.5) internal successors, (338), 3 states have internal predecessors, (338), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:33,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:33,138 INFO L93 Difference]: Finished difference Result 29039 states and 31625 transitions. [2021-11-23 16:54:33,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:54:33,139 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 84.5) internal successors, (338), 3 states have internal predecessors, (338), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 341 [2021-11-23 16:54:33,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:33,176 INFO L225 Difference]: With dead ends: 29039 [2021-11-23 16:54:33,177 INFO L226 Difference]: Without dead ends: 19637 [2021-11-23 16:54:33,188 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 338 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:54:33,189 INFO L933 BasicCegarLoop]: 248 mSDtfsCounter, 373 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 1206 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 373 SdHoareTripleChecker+Valid, 315 SdHoareTripleChecker+Invalid, 1339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 1206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:33,189 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [373 Valid, 315 Invalid, 1339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 1206 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-11-23 16:54:33,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19637 states. [2021-11-23 16:54:33,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19637 to 19617. [2021-11-23 16:54:33,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19617 states, 19616 states have (on average 1.0719820554649266) internal successors, (21028), 19616 states have internal predecessors, (21028), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:33,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19617 states to 19617 states and 21028 transitions. [2021-11-23 16:54:33,525 INFO L78 Accepts]: Start accepts. Automaton has 19617 states and 21028 transitions. Word has length 341 [2021-11-23 16:54:33,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:33,526 INFO L470 AbstractCegarLoop]: Abstraction has 19617 states and 21028 transitions. [2021-11-23 16:54:33,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 84.5) internal successors, (338), 3 states have internal predecessors, (338), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:33,526 INFO L276 IsEmpty]: Start isEmpty. Operand 19617 states and 21028 transitions. [2021-11-23 16:54:33,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2021-11-23 16:54:33,577 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:33,579 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:54:33,597 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:33,792 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:54:33,793 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:33,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:33,793 INFO L85 PathProgramCache]: Analyzing trace with hash 9023021, now seen corresponding path program 1 times [2021-11-23 16:54:33,795 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:33,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1209382063] [2021-11-23 16:54:33,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:33,795 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:33,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:33,796 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:33,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 16:54:34,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:34,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 469 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:54:34,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:34,574 INFO L134 CoverageAnalysis]: Checked inductivity of 191 backedges. 159 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:54:34,574 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:54:34,574 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:34,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1209382063] [2021-11-23 16:54:34,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1209382063] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:54:34,575 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:54:34,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:54:34,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924540567] [2021-11-23 16:54:34,575 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:54:34,576 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:54:34,576 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:34,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:54:34,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:54:34,576 INFO L87 Difference]: Start difference. First operand 19617 states and 21028 transitions. Second operand has 3 states, 3 states have (on average 104.66666666666667) internal successors, (314), 3 states have internal predecessors, (314), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:35,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:35,809 INFO L93 Difference]: Finished difference Result 36954 states and 39682 transitions. [2021-11-23 16:54:35,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:54:35,810 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 104.66666666666667) internal successors, (314), 3 states have internal predecessors, (314), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 344 [2021-11-23 16:54:35,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:35,840 INFO L225 Difference]: With dead ends: 36954 [2021-11-23 16:54:35,840 INFO L226 Difference]: Without dead ends: 17581 [2021-11-23 16:54:35,857 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:54:35,858 INFO L933 BasicCegarLoop]: 238 mSDtfsCounter, 69 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 553 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 628 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 553 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:35,858 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 267 Invalid, 628 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 553 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 16:54:35,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17581 states. [2021-11-23 16:54:36,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17581 to 17369. [2021-11-23 16:54:36,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17369 states, 17368 states have (on average 1.0652924919391986) internal successors, (18502), 17368 states have internal predecessors, (18502), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:36,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17369 states to 17369 states and 18502 transitions. [2021-11-23 16:54:36,192 INFO L78 Accepts]: Start accepts. Automaton has 17369 states and 18502 transitions. Word has length 344 [2021-11-23 16:54:36,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:36,193 INFO L470 AbstractCegarLoop]: Abstraction has 17369 states and 18502 transitions. [2021-11-23 16:54:36,193 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 104.66666666666667) internal successors, (314), 3 states have internal predecessors, (314), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:36,194 INFO L276 IsEmpty]: Start isEmpty. Operand 17369 states and 18502 transitions. [2021-11-23 16:54:36,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2021-11-23 16:54:36,292 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:36,293 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:54:36,349 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:36,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:54:36,513 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:36,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:36,514 INFO L85 PathProgramCache]: Analyzing trace with hash -114174243, now seen corresponding path program 1 times [2021-11-23 16:54:36,518 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:36,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1187069939] [2021-11-23 16:54:36,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:36,519 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:36,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:36,533 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:36,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 16:54:36,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:36,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:54:36,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:37,385 INFO L134 CoverageAnalysis]: Checked inductivity of 236 backedges. 226 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:54:37,385 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:54:37,385 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:37,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1187069939] [2021-11-23 16:54:37,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1187069939] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:54:37,386 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:54:37,386 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:54:37,386 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437537026] [2021-11-23 16:54:37,387 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:54:37,387 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:54:37,388 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:37,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:54:37,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:54:37,388 INFO L87 Difference]: Start difference. First operand 17369 states and 18502 transitions. Second operand has 4 states, 4 states have (on average 89.25) internal successors, (357), 4 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:38,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:38,721 INFO L93 Difference]: Finished difference Result 32429 states and 34579 transitions. [2021-11-23 16:54:38,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:54:38,722 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 89.25) internal successors, (357), 4 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 365 [2021-11-23 16:54:38,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:38,749 INFO L225 Difference]: With dead ends: 32429 [2021-11-23 16:54:38,749 INFO L226 Difference]: Without dead ends: 15304 [2021-11-23 16:54:38,760 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 362 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:54:38,761 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 582 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 686 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 582 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 779 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 686 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:38,762 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [582 Valid, 51 Invalid, 779 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 686 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-23 16:54:38,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15304 states. [2021-11-23 16:54:38,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15304 to 15304. [2021-11-23 16:54:38,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15304 states, 15303 states have (on average 1.0543684244919296) internal successors, (16135), 15303 states have internal predecessors, (16135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:39,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15304 states to 15304 states and 16135 transitions. [2021-11-23 16:54:39,021 INFO L78 Accepts]: Start accepts. Automaton has 15304 states and 16135 transitions. Word has length 365 [2021-11-23 16:54:39,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:39,022 INFO L470 AbstractCegarLoop]: Abstraction has 15304 states and 16135 transitions. [2021-11-23 16:54:39,022 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 89.25) internal successors, (357), 4 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:39,022 INFO L276 IsEmpty]: Start isEmpty. Operand 15304 states and 16135 transitions. [2021-11-23 16:54:39,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 372 [2021-11-23 16:54:39,041 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:39,041 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:54:39,057 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:39,254 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:54:39,255 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:39,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:39,255 INFO L85 PathProgramCache]: Analyzing trace with hash -1247764675, now seen corresponding path program 1 times [2021-11-23 16:54:39,258 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:39,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [521467272] [2021-11-23 16:54:39,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:39,258 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:39,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:39,259 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:39,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 16:54:39,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:39,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 16:54:39,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:59,549 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 103 proven. 158 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:59,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:41,941 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 96 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:41,942 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:41,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [521467272] [2021-11-23 16:55:41,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [521467272] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:41,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [834842427] [2021-11-23 16:55:41,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:41,942 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:41,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:41,944 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:41,945 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-23 16:55:42,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:42,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:55:42,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:42,859 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 180 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-23 16:55:42,859 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:55:42,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [834842427] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:55:42,859 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:55:42,860 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [12, 12] total 25 [2021-11-23 16:55:42,860 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543418973] [2021-11-23 16:55:42,860 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:55:42,861 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:55:42,861 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:42,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:55:42,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=456, Unknown=0, NotChecked=0, Total=600 [2021-11-23 16:55:42,862 INFO L87 Difference]: Start difference. First operand 15304 states and 16135 transitions. Second operand has 3 states, 3 states have (on average 98.33333333333333) internal successors, (295), 3 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:44,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:44,041 INFO L93 Difference]: Finished difference Result 34426 states and 36515 transitions. [2021-11-23 16:55:44,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:55:44,042 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 98.33333333333333) internal successors, (295), 3 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 371 [2021-11-23 16:55:44,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:44,069 INFO L225 Difference]: With dead ends: 34426 [2021-11-23 16:55:44,070 INFO L226 Difference]: Without dead ends: 19366 [2021-11-23 16:55:44,078 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1110 GetRequests, 1087 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=144, Invalid=456, Unknown=0, NotChecked=0, Total=600 [2021-11-23 16:55:44,079 INFO L933 BasicCegarLoop]: 191 mSDtfsCounter, 71 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 547 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 600 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:44,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 199 Invalid, 600 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 547 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 16:55:44,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19366 states. [2021-11-23 16:55:44,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19366 to 18958. [2021-11-23 16:55:44,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18958 states, 18957 states have (on average 1.0624571398428022) internal successors, (20141), 18957 states have internal predecessors, (20141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:44,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18958 states to 18958 states and 20141 transitions. [2021-11-23 16:55:44,357 INFO L78 Accepts]: Start accepts. Automaton has 18958 states and 20141 transitions. Word has length 371 [2021-11-23 16:55:44,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:44,358 INFO L470 AbstractCegarLoop]: Abstraction has 18958 states and 20141 transitions. [2021-11-23 16:55:44,358 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 98.33333333333333) internal successors, (295), 3 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:44,358 INFO L276 IsEmpty]: Start isEmpty. Operand 18958 states and 20141 transitions. [2021-11-23 16:55:44,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2021-11-23 16:55:44,380 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:44,381 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:55:44,397 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:44,595 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:44,794 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:44,794 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:44,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:44,795 INFO L85 PathProgramCache]: Analyzing trace with hash 765164126, now seen corresponding path program 1 times [2021-11-23 16:55:44,797 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:44,798 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1133528523] [2021-11-23 16:55:44,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:44,798 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:44,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:44,799 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:44,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 16:55:45,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:45,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:55:45,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:45,877 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 317 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 16:55:45,877 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:55:45,878 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:45,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1133528523] [2021-11-23 16:55:45,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1133528523] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:55:45,878 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:55:45,878 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:55:45,878 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890773798] [2021-11-23 16:55:45,879 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:55:45,879 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:55:45,879 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:45,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:55:45,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:55:45,880 INFO L87 Difference]: Start difference. First operand 18958 states and 20141 transitions. Second operand has 4 states, 4 states have (on average 93.25) internal successors, (373), 3 states have internal predecessors, (373), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:47,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:47,638 INFO L93 Difference]: Finished difference Result 38486 states and 40917 transitions. [2021-11-23 16:55:47,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:55:47,639 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 93.25) internal successors, (373), 3 states have internal predecessors, (373), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 407 [2021-11-23 16:55:47,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:47,655 INFO L225 Difference]: With dead ends: 38486 [2021-11-23 16:55:47,655 INFO L226 Difference]: Without dead ends: 19772 [2021-11-23 16:55:47,663 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 404 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:55:47,664 INFO L933 BasicCegarLoop]: 155 mSDtfsCounter, 281 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 874 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 970 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 874 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:47,664 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [281 Valid, 177 Invalid, 970 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 874 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-23 16:55:47,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19772 states. [2021-11-23 16:55:47,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19772 to 19770. [2021-11-23 16:55:47,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19770 states, 19769 states have (on average 1.0590824017400982) internal successors, (20937), 19769 states have internal predecessors, (20937), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:47,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19770 states to 19770 states and 20937 transitions. [2021-11-23 16:55:47,945 INFO L78 Accepts]: Start accepts. Automaton has 19770 states and 20937 transitions. Word has length 407 [2021-11-23 16:55:47,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:47,946 INFO L470 AbstractCegarLoop]: Abstraction has 19770 states and 20937 transitions. [2021-11-23 16:55:47,946 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 93.25) internal successors, (373), 3 states have internal predecessors, (373), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:47,946 INFO L276 IsEmpty]: Start isEmpty. Operand 19770 states and 20937 transitions. [2021-11-23 16:55:47,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 414 [2021-11-23 16:55:47,967 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:47,967 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:55:47,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:48,173 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:55:48,173 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:48,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:48,174 INFO L85 PathProgramCache]: Analyzing trace with hash -75029632, now seen corresponding path program 1 times [2021-11-23 16:55:48,176 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:48,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [64223176] [2021-11-23 16:55:48,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:48,177 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:48,177 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:48,177 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:48,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 16:55:48,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:48,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 552 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 16:55:48,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:50,927 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 244 proven. 72 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-23 16:55:50,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:54,082 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 244 proven. 72 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-23 16:55:54,082 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:54,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [64223176] [2021-11-23 16:55:54,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [64223176] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:54,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [241580727] [2021-11-23 16:55:54,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:54,083 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:54,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:54,088 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:54,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-23 16:55:54,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:54,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 552 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:55:54,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:55,088 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 309 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-23 16:55:55,088 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:55:55,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [241580727] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:55:55,088 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:55:55,089 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6, 6] total 12 [2021-11-23 16:55:55,089 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024776753] [2021-11-23 16:55:55,089 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:55:55,090 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:55:55,090 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:55,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:55:55,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2021-11-23 16:55:55,091 INFO L87 Difference]: Start difference. First operand 19770 states and 20937 transitions. Second operand has 3 states, 3 states have (on average 112.33333333333333) internal successors, (337), 3 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:56,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:56,309 INFO L93 Difference]: Finished difference Result 40524 states and 43019 transitions. [2021-11-23 16:55:56,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:55:56,309 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 112.33333333333333) internal successors, (337), 3 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 413 [2021-11-23 16:55:56,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:56,329 INFO L225 Difference]: With dead ends: 40524 [2021-11-23 16:55:56,330 INFO L226 Difference]: Without dead ends: 20998 [2021-11-23 16:55:56,341 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1236 GetRequests, 1226 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2021-11-23 16:55:56,342 INFO L933 BasicCegarLoop]: 292 mSDtfsCounter, 180 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 520 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 304 SdHoareTripleChecker+Invalid, 623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:56,343 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [180 Valid, 304 Invalid, 623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 520 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 16:55:56,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20998 states. [2021-11-23 16:55:56,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20998 to 20988. [2021-11-23 16:55:56,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20988 states, 20987 states have (on average 1.056606470672321) internal successors, (22175), 20987 states have internal predecessors, (22175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:56,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20988 states to 20988 states and 22175 transitions. [2021-11-23 16:55:56,645 INFO L78 Accepts]: Start accepts. Automaton has 20988 states and 22175 transitions. Word has length 413 [2021-11-23 16:55:56,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:56,645 INFO L470 AbstractCegarLoop]: Abstraction has 20988 states and 22175 transitions. [2021-11-23 16:55:56,645 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 112.33333333333333) internal successors, (337), 3 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:56,645 INFO L276 IsEmpty]: Start isEmpty. Operand 20988 states and 22175 transitions. [2021-11-23 16:55:56,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 420 [2021-11-23 16:55:56,665 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:56,666 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:55:56,679 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:56,880 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:57,079 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:57,079 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:57,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:57,080 INFO L85 PathProgramCache]: Analyzing trace with hash -98839132, now seen corresponding path program 1 times [2021-11-23 16:55:57,082 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:57,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1400928935] [2021-11-23 16:55:57,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:57,083 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:57,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:57,084 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:57,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 16:55:57,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:57,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 577 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 16:55:57,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:59,591 INFO L134 CoverageAnalysis]: Checked inductivity of 417 backedges. 271 proven. 72 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-23 16:55:59,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:02,138 INFO L134 CoverageAnalysis]: Checked inductivity of 417 backedges. 271 proven. 72 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-23 16:56:02,139 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:56:02,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1400928935] [2021-11-23 16:56:02,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1400928935] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:02,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [958174185] [2021-11-23 16:56:02,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:02,139 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:56:02,139 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:56:02,140 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:56:02,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-23 16:56:02,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:02,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 577 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:56:02,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:06,495 INFO L134 CoverageAnalysis]: Checked inductivity of 417 backedges. 72 proven. 264 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-23 16:56:06,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:11,233 INFO L134 CoverageAnalysis]: Checked inductivity of 417 backedges. 72 proven. 264 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-23 16:56:11,234 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [958174185] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:11,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [672880818] [2021-11-23 16:56:11,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:11,234 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:56:11,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:56:11,239 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:56:11,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 16:56:11,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:11,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 577 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 16:56:11,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:14,022 INFO L134 CoverageAnalysis]: Checked inductivity of 417 backedges. 271 proven. 72 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-23 16:56:14,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:16,564 INFO L134 CoverageAnalysis]: Checked inductivity of 417 backedges. 271 proven. 72 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-23 16:56:16,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [672880818] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:16,564 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:56:16,565 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 6, 6, 6, 6] total 24 [2021-11-23 16:56:16,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359003167] [2021-11-23 16:56:16,566 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:56:16,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 16:56:16,569 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:56:16,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 16:56:16,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=440, Unknown=0, NotChecked=0, Total=600 [2021-11-23 16:56:16,570 INFO L87 Difference]: Start difference. First operand 20988 states and 22175 transitions. Second operand has 25 states, 25 states have (on average 40.52) internal successors, (1013), 24 states have internal predecessors, (1013), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:56,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:56:56,488 INFO L93 Difference]: Finished difference Result 184129 states and 194863 transitions. [2021-11-23 16:56:56,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 196 states. [2021-11-23 16:56:56,489 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 40.52) internal successors, (1013), 24 states have internal predecessors, (1013), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 419 [2021-11-23 16:56:56,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:56:56,700 INFO L225 Difference]: With dead ends: 184129 [2021-11-23 16:56:56,701 INFO L226 Difference]: Without dead ends: 163385 [2021-11-23 16:56:56,750 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2685 GetRequests, 2485 SyntacticMatches, 0 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18589 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=6855, Invalid=33747, Unknown=0, NotChecked=0, Total=40602 [2021-11-23 16:56:56,751 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 13884 mSDsluCounter, 769 mSDsCounter, 0 mSdLazyCounter, 19629 mSolverCounterSat, 3084 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 23.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13884 SdHoareTripleChecker+Valid, 840 SdHoareTripleChecker+Invalid, 22713 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 3084 IncrementalHoareTripleChecker+Valid, 19629 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 28.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:56:56,751 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13884 Valid, 840 Invalid, 22713 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [3084 Valid, 19629 Invalid, 0 Unknown, 0 Unchecked, 28.3s Time] [2021-11-23 16:56:57,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163385 states. [2021-11-23 16:56:58,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163385 to 97840. [2021-11-23 16:56:58,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97840 states, 97839 states have (on average 1.0557241999611606) internal successors, (103291), 97839 states have internal predecessors, (103291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:58,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97840 states to 97840 states and 103291 transitions. [2021-11-23 16:56:58,917 INFO L78 Accepts]: Start accepts. Automaton has 97840 states and 103291 transitions. Word has length 419 [2021-11-23 16:56:58,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:56:58,918 INFO L470 AbstractCegarLoop]: Abstraction has 97840 states and 103291 transitions. [2021-11-23 16:56:58,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 40.52) internal successors, (1013), 24 states have internal predecessors, (1013), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:58,918 INFO L276 IsEmpty]: Start isEmpty. Operand 97840 states and 103291 transitions. [2021-11-23 16:56:58,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 425 [2021-11-23 16:56:58,955 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:56:58,956 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:56:58,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:59,171 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:59,394 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-11-23 16:56:59,569 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:56:59,570 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:56:59,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:56:59,570 INFO L85 PathProgramCache]: Analyzing trace with hash 1837434584, now seen corresponding path program 1 times [2021-11-23 16:56:59,573 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:56:59,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [545089768] [2021-11-23 16:56:59,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:59,574 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:56:59,574 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:56:59,576 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:56:59,577 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 16:56:59,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:59,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:56:59,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:04,363 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 331 proven. 11 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 16:57:04,363 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:09,317 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 283 proven. 59 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 16:57:09,317 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:57:09,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [545089768] [2021-11-23 16:57:09,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [545089768] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:09,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [235801877] [2021-11-23 16:57:09,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:09,318 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:57:09,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:57:09,330 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:57:09,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-23 16:57:09,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:09,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:57:09,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:10,506 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 336 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 16:57:10,506 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:57:10,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [235801877] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:57:10,506 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:57:10,506 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5, 5] total 10 [2021-11-23 16:57:10,507 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789708883] [2021-11-23 16:57:10,507 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:57:10,507 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:57:10,507 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:57:10,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:57:10,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-23 16:57:10,509 INFO L87 Difference]: Start difference. First operand 97840 states and 103291 transitions. Second operand has 3 states, 3 states have (on average 130.0) internal successors, (390), 3 states have internal predecessors, (390), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:12,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:12,343 INFO L93 Difference]: Finished difference Result 200714 states and 211730 transitions. [2021-11-23 16:57:12,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:57:12,344 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 130.0) internal successors, (390), 3 states have internal predecessors, (390), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 424 [2021-11-23 16:57:12,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:12,520 INFO L225 Difference]: With dead ends: 200714 [2021-11-23 16:57:12,521 INFO L226 Difference]: Without dead ends: 103118 [2021-11-23 16:57:12,580 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1269 GetRequests, 1261 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-23 16:57:12,581 INFO L933 BasicCegarLoop]: 249 mSDtfsCounter, 155 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:12,582 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [155 Valid, 265 Invalid, 530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 16:57:12,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103118 states. [2021-11-23 16:57:14,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103118 to 102509. [2021-11-23 16:57:14,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102509 states, 102508 states have (on average 1.0527178366566512) internal successors, (107912), 102508 states have internal predecessors, (107912), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:14,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102509 states to 102509 states and 107912 transitions. [2021-11-23 16:57:14,979 INFO L78 Accepts]: Start accepts. Automaton has 102509 states and 107912 transitions. Word has length 424 [2021-11-23 16:57:14,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:14,980 INFO L470 AbstractCegarLoop]: Abstraction has 102509 states and 107912 transitions. [2021-11-23 16:57:14,980 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 130.0) internal successors, (390), 3 states have internal predecessors, (390), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:14,980 INFO L276 IsEmpty]: Start isEmpty. Operand 102509 states and 107912 transitions. [2021-11-23 16:57:15,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 435 [2021-11-23 16:57:15,014 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:15,014 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:57:15,020 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (27)] Ended with exit code 0 [2021-11-23 16:57:15,225 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Ended with exit code 0 [2021-11-23 16:57:15,416 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:57:15,417 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:15,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:15,418 INFO L85 PathProgramCache]: Analyzing trace with hash -1391731963, now seen corresponding path program 1 times [2021-11-23 16:57:15,421 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:15,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [95805437] [2021-11-23 16:57:15,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:15,422 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:15,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:15,423 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:15,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 16:57:15,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:15,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 594 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:57:15,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:16,841 INFO L134 CoverageAnalysis]: Checked inductivity of 467 backedges. 461 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:57:16,841 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:57:16,841 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:57:16,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [95805437] [2021-11-23 16:57:16,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [95805437] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:57:16,841 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:57:16,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:57:16,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386021195] [2021-11-23 16:57:16,842 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:57:16,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:57:16,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:57:16,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:57:16,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:57:16,843 INFO L87 Difference]: Start difference. First operand 102509 states and 107912 transitions. Second operand has 5 states, 5 states have (on average 85.8) internal successors, (429), 5 states have internal predecessors, (429), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:19,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:19,972 INFO L93 Difference]: Finished difference Result 316399 states and 333286 transitions. [2021-11-23 16:57:19,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:57:19,973 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 85.8) internal successors, (429), 5 states have internal predecessors, (429), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 434 [2021-11-23 16:57:19,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:20,545 INFO L225 Difference]: With dead ends: 316399 [2021-11-23 16:57:20,545 INFO L226 Difference]: Without dead ends: 213322 [2021-11-23 16:57:20,612 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 430 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:57:20,620 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 919 mSDsluCounter, 341 mSDsCounter, 0 mSdLazyCounter, 819 mSolverCounterSat, 199 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 919 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 1018 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 199 IncrementalHoareTripleChecker+Valid, 819 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:20,620 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [919 Valid, 459 Invalid, 1018 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [199 Valid, 819 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-23 16:57:20,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213322 states. [2021-11-23 16:57:24,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213322 to 208038. [2021-11-23 16:57:24,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208038 states, 208037 states have (on average 1.05352413272639) internal successors, (219172), 208037 states have internal predecessors, (219172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:25,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208038 states to 208038 states and 219172 transitions. [2021-11-23 16:57:25,006 INFO L78 Accepts]: Start accepts. Automaton has 208038 states and 219172 transitions. Word has length 434 [2021-11-23 16:57:25,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:25,007 INFO L470 AbstractCegarLoop]: Abstraction has 208038 states and 219172 transitions. [2021-11-23 16:57:25,007 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 85.8) internal successors, (429), 5 states have internal predecessors, (429), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:25,007 INFO L276 IsEmpty]: Start isEmpty. Operand 208038 states and 219172 transitions. [2021-11-23 16:57:25,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 442 [2021-11-23 16:57:25,049 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:25,049 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:57:25,067 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:25,264 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:57:25,265 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:25,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:25,266 INFO L85 PathProgramCache]: Analyzing trace with hash 864622115, now seen corresponding path program 1 times [2021-11-23 16:57:25,271 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:25,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [220192805] [2021-11-23 16:57:25,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:25,271 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:25,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:25,273 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:25,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 16:57:25,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:25,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 592 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:57:25,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:26,148 INFO L134 CoverageAnalysis]: Checked inductivity of 476 backedges. 428 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 16:57:26,148 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:57:26,149 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:57:26,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [220192805] [2021-11-23 16:57:26,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [220192805] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:57:26,149 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:57:26,149 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:57:26,149 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906058388] [2021-11-23 16:57:26,149 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:57:26,150 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:57:26,150 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:57:26,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:57:26,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:57:26,151 INFO L87 Difference]: Start difference. First operand 208038 states and 219172 transitions. Second operand has 4 states, 4 states have (on average 98.75) internal successors, (395), 4 states have internal predecessors, (395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:29,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:29,868 INFO L93 Difference]: Finished difference Result 481177 states and 507709 transitions. [2021-11-23 16:57:29,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:57:29,868 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 98.75) internal successors, (395), 4 states have internal predecessors, (395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 441 [2021-11-23 16:57:29,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:30,257 INFO L225 Difference]: With dead ends: 481177 [2021-11-23 16:57:30,257 INFO L226 Difference]: Without dead ends: 273180 [2021-11-23 16:57:30,360 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 438 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:57:30,360 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 651 mSDsluCounter, 228 mSDsCounter, 0 mSdLazyCounter, 673 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 651 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 791 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 673 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:30,361 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [651 Valid, 314 Invalid, 791 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 673 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-23 16:57:30,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273180 states. [2021-11-23 16:57:35,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273180 to 256839. [2021-11-23 16:57:35,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256839 states, 256838 states have (on average 1.056124872487716) internal successors, (271253), 256838 states have internal predecessors, (271253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:35,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256839 states to 256839 states and 271253 transitions. [2021-11-23 16:57:35,986 INFO L78 Accepts]: Start accepts. Automaton has 256839 states and 271253 transitions. Word has length 441 [2021-11-23 16:57:35,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:35,987 INFO L470 AbstractCegarLoop]: Abstraction has 256839 states and 271253 transitions. [2021-11-23 16:57:35,987 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 98.75) internal successors, (395), 4 states have internal predecessors, (395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:35,987 INFO L276 IsEmpty]: Start isEmpty. Operand 256839 states and 271253 transitions. [2021-11-23 16:57:36,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 456 [2021-11-23 16:57:36,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:36,023 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:57:36,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:36,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:57:36,224 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:36,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:36,224 INFO L85 PathProgramCache]: Analyzing trace with hash 1479646632, now seen corresponding path program 1 times [2021-11-23 16:57:36,227 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:36,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [687305841] [2021-11-23 16:57:36,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:36,228 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:36,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:36,228 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:36,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dcb3b3e-d0ab-4a73-a396-d011d9fadd29/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 16:57:36,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:36,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 573 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 16:57:36,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:17,425 INFO L134 CoverageAnalysis]: Checked inductivity of 448 backedges. 64 proven. 384 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:17,426 INFO L328 TraceCheckSpWp]: Computing backward predicates...