./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label05.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_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/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_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label05.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/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_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/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 55a25aaba499ad6f05f5b24cde70628308432569fd1f75e76cd806a685179688 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:19:33,319 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:19:33,321 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:19:33,355 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:19:33,356 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:19:33,357 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:19:33,359 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:19:33,362 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:19:33,364 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:19:33,365 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:19:33,367 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:19:33,368 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:19:33,369 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:19:33,371 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:19:33,372 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:19:33,374 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:19:33,376 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:19:33,377 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:19:33,380 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:19:33,383 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:19:33,385 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:19:33,387 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:19:33,389 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:19:33,390 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:19:33,395 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:19:33,395 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:19:33,396 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:19:33,397 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:19:33,398 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:19:33,400 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:19:33,400 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:19:33,402 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:19:33,403 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:19:33,404 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:19:33,406 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:19:33,406 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:19:33,408 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:19:33,408 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:19:33,409 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:19:33,410 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:19:33,411 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:19:33,415 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:19:33,467 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:19:33,468 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:19:33,468 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:19:33,469 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:19:33,470 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:19:33,470 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:19:33,470 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:19:33,471 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:19:33,471 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:19:33,471 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:19:33,471 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:19:33,472 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:19:33,472 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:19:33,472 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:19:33,472 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:19:33,473 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:19:33,473 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:19:33,473 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:19:33,474 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:19:33,475 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:19:33,475 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:19:33,475 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:19:33,475 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:19:33,476 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:19:33,476 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:19:33,476 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:19:33,476 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:19:33,477 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:19:33,477 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:19:33,477 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:19:33,477 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:19:33,478 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:19:33,480 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:19:33,481 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:19:33,481 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:19:33,482 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:19:33,482 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:19:33,482 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:19:33,483 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:19:33,483 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:19:33,483 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:19:33,483 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_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 55a25aaba499ad6f05f5b24cde70628308432569fd1f75e76cd806a685179688 [2021-11-23 17:19:33,817 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:19:33,854 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:19:33,857 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:19:33,859 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:19:33,860 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:19:33,861 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label05.c [2021-11-23 17:19:33,944 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/data/9f8dbdb43/e59c64203df14c04bb5a53624b530b51/FLAG66ade4062 [2021-11-23 17:19:34,916 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:19:34,917 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label05.c [2021-11-23 17:19:34,967 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/data/9f8dbdb43/e59c64203df14c04bb5a53624b530b51/FLAG66ade4062 [2021-11-23 17:19:35,343 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/data/9f8dbdb43/e59c64203df14c04bb5a53624b530b51 [2021-11-23 17:19:35,346 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:19:35,347 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:19:35,349 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:19:35,349 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:19:35,354 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:19:35,355 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:19:35" (1/1) ... [2021-11-23 17:19:35,357 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e1ffe5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:35, skipping insertion in model container [2021-11-23 17:19:35,358 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:19:35" (1/1) ... [2021-11-23 17:19:35,364 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:19:35,535 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:19:36,056 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_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label05.c[6391,6404] [2021-11-23 17:19:36,169 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_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label05.c[13327,13340] [2021-11-23 17:19:37,255 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:19:37,266 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:19:37,320 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_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label05.c[6391,6404] [2021-11-23 17:19:37,351 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_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label05.c[13327,13340] [2021-11-23 17:19:38,245 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:19:38,281 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:19:38,282 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:38 WrapperNode [2021-11-23 17:19:38,282 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:19:38,284 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:19:38,284 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:19:38,284 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:19:38,294 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:38" (1/1) ... [2021-11-23 17:19:38,429 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:38" (1/1) ... [2021-11-23 17:19:38,893 INFO L137 Inliner]: procedures = 33, calls = 19, calls flagged for inlining = 14, calls inlined = 14, statements flattened = 4977 [2021-11-23 17:19:38,894 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:19:38,895 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:19:38,895 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:19:38,895 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:19:38,909 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:38" (1/1) ... [2021-11-23 17:19:38,918 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:38" (1/1) ... [2021-11-23 17:19:39,033 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:38" (1/1) ... [2021-11-23 17:19:39,033 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:38" (1/1) ... [2021-11-23 17:19:39,348 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:38" (1/1) ... [2021-11-23 17:19:39,396 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:38" (1/1) ... [2021-11-23 17:19:39,492 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:38" (1/1) ... [2021-11-23 17:19:39,575 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:19:39,576 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:19:39,577 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:19:39,577 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:19:39,578 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:38" (1/1) ... [2021-11-23 17:19:39,588 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:19:39,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:19:39,624 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:19:39,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:19:39,684 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:19:39,684 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:19:39,684 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:19:39,685 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:19:39,837 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:19:39,839 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:19:45,555 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:19:45,653 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 17:19:45,666 INFO L158 Benchmark]: Toolchain (without parser) took 10315.88ms. Allocated memory was 88.1MB in the beginning and 599.8MB in the end (delta: 511.7MB). Free memory was 51.4MB in the beginning and 360.1MB in the end (delta: -308.7MB). Peak memory consumption was 205.0MB. Max. memory is 16.1GB. [2021-11-23 17:19:45,667 INFO L158 Benchmark]: CDTParser took 0.35ms. Allocated memory is still 88.1MB. Free memory is still 63.6MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:19:45,670 INFO L158 Benchmark]: CACSL2BoogieTranslator took 2933.72ms. Allocated memory was 88.1MB in the beginning and 153.1MB in the end (delta: 65.0MB). Free memory was 51.0MB in the beginning and 69.6MB in the end (delta: -18.6MB). Peak memory consumption was 46.7MB. Max. memory is 16.1GB. [2021-11-23 17:19:45,671 INFO L158 Benchmark]: Boogie Procedure Inliner took 610.75ms. Allocated memory is still 153.1MB. Free memory was 69.6MB in the beginning and 60.4MB in the end (delta: 9.2MB). Peak memory consumption was 46.2MB. Max. memory is 16.1GB. [2021-11-23 17:19:45,673 INFO L158 Benchmark]: Boogie Preprocessor took 679.97ms. Allocated memory was 153.1MB in the beginning and 299.9MB in the end (delta: 146.8MB). Free memory was 60.4MB in the beginning and 184.9MB in the end (delta: -124.5MB). Peak memory consumption was 24.1MB. Max. memory is 16.1GB. [2021-11-23 17:19:45,674 INFO L158 Benchmark]: RCFGBuilder took 6085.86ms. Allocated memory was 299.9MB in the beginning and 599.8MB in the end (delta: 299.9MB). Free memory was 184.9MB in the beginning and 360.1MB in the end (delta: -175.3MB). Peak memory consumption was 125.7MB. Max. memory is 16.1GB. [2021-11-23 17:19:45,686 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.35ms. Allocated memory is still 88.1MB. Free memory is still 63.6MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 2933.72ms. Allocated memory was 88.1MB in the beginning and 153.1MB in the end (delta: 65.0MB). Free memory was 51.0MB in the beginning and 69.6MB in the end (delta: -18.6MB). Peak memory consumption was 46.7MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 610.75ms. Allocated memory is still 153.1MB. Free memory was 69.6MB in the beginning and 60.4MB in the end (delta: 9.2MB). Peak memory consumption was 46.2MB. Max. memory is 16.1GB. * Boogie Preprocessor took 679.97ms. Allocated memory was 153.1MB in the beginning and 299.9MB in the end (delta: 146.8MB). Free memory was 60.4MB in the beginning and 184.9MB in the end (delta: -124.5MB). Peak memory consumption was 24.1MB. Max. memory is 16.1GB. * RCFGBuilder took 6085.86ms. Allocated memory was 299.9MB in the beginning and 599.8MB in the end (delta: 299.9MB). Free memory was 184.9MB in the beginning and 360.1MB in the end (delta: -175.3MB). Peak memory consumption was 125.7MB. 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 17:19:45,723 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/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_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/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_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label05.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/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_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/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 55a25aaba499ad6f05f5b24cde70628308432569fd1f75e76cd806a685179688 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:19:48,653 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:19:48,656 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:19:48,733 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:19:48,734 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:19:48,739 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:19:48,742 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:19:48,747 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:19:48,750 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:19:48,759 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:19:48,761 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:19:48,763 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:19:48,764 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:19:48,767 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:19:48,769 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:19:48,772 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:19:48,774 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:19:48,775 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:19:48,781 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:19:48,793 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:19:48,796 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:19:48,797 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:19:48,801 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:19:48,803 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:19:48,814 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:19:48,815 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:19:48,816 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:19:48,818 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:19:48,819 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:19:48,820 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:19:48,821 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:19:48,822 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:19:48,825 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:19:48,826 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:19:48,828 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:19:48,828 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:19:48,830 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:19:48,830 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:19:48,830 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:19:48,833 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:19:48,834 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:19:48,835 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:19:48,889 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:19:48,889 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:19:48,890 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:19:48,890 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:19:48,891 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:19:48,892 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:19:48,892 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:19:48,892 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:19:48,893 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:19:48,893 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:19:48,894 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:19:48,894 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:19:48,896 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:19:48,896 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:19:48,897 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:19:48,897 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:19:48,897 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:19:48,897 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:19:48,898 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:19:48,898 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:19:48,898 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:19:48,898 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:19:48,899 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:19:48,899 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:19:48,899 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:19:48,899 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:19:48,900 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:19:48,900 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:19:48,900 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:19:48,900 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:19:48,901 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:19:48,901 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:19:48,902 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:19:48,902 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:19:48,902 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:48,902 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:19:48,903 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:19:48,903 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:19:48,903 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_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 55a25aaba499ad6f05f5b24cde70628308432569fd1f75e76cd806a685179688 [2021-11-23 17:19:49,398 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:19:49,433 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:19:49,436 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:19:49,437 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:19:49,438 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:19:49,440 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label05.c [2021-11-23 17:19:49,515 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/data/b764d0a41/1b204c5152b94b738853beb357402776/FLAG81ce81f3a [2021-11-23 17:19:50,458 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:19:50,459 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label05.c [2021-11-23 17:19:50,504 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/data/b764d0a41/1b204c5152b94b738853beb357402776/FLAG81ce81f3a [2021-11-23 17:19:50,917 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/data/b764d0a41/1b204c5152b94b738853beb357402776 [2021-11-23 17:19:50,921 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:19:50,923 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:19:50,927 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:19:50,927 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:19:50,931 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:19:50,933 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:19:50" (1/1) ... [2021-11-23 17:19:50,936 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@42df5af6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:50, skipping insertion in model container [2021-11-23 17:19:50,936 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:19:50" (1/1) ... [2021-11-23 17:19:50,945 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:19:51,154 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:19:51,678 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_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label05.c[6391,6404] [2021-11-23 17:19:51,805 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_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label05.c[13327,13340] [2021-11-23 17:19:53,153 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:19:53,172 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:19:53,223 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_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label05.c[6391,6404] [2021-11-23 17:19:53,239 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_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label05.c[13327,13340] [2021-11-23 17:19:53,942 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:19:53,999 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:19:54,000 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:54 WrapperNode [2021-11-23 17:19:54,000 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:19:54,002 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:19:54,002 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:19:54,002 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:19:54,011 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:54" (1/1) ... [2021-11-23 17:19:54,106 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:54" (1/1) ... [2021-11-23 17:19:54,284 INFO L137 Inliner]: procedures = 34, calls = 19, calls flagged for inlining = 14, calls inlined = 14, statements flattened = 4958 [2021-11-23 17:19:54,284 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:19:54,286 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:19:54,286 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:19:54,286 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:19:54,296 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:54" (1/1) ... [2021-11-23 17:19:54,296 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:54" (1/1) ... [2021-11-23 17:19:54,342 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:54" (1/1) ... [2021-11-23 17:19:54,354 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:54" (1/1) ... [2021-11-23 17:19:54,490 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:54" (1/1) ... [2021-11-23 17:19:54,565 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:54" (1/1) ... [2021-11-23 17:19:54,583 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:54" (1/1) ... [2021-11-23 17:19:54,612 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:19:54,614 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:19:54,614 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:19:54,615 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:19:54,616 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:54" (1/1) ... [2021-11-23 17:19:54,623 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:19:54,635 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:19:54,652 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:19:54,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:19:54,746 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:19:54,746 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:19:54,746 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:19:54,746 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:19:54,860 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:19:54,862 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:20:25,817 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:20:25,842 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:20:25,842 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 17:20:25,846 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:20:25 BoogieIcfgContainer [2021-11-23 17:20:25,846 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:20:25,848 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:20:25,849 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:20:25,851 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:20:25,852 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:19:50" (1/3) ... [2021-11-23 17:20:25,852 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@db0ce9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:20:25, skipping insertion in model container [2021-11-23 17:20:25,852 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:19:54" (2/3) ... [2021-11-23 17:20:25,853 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@db0ce9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:20:25, skipping insertion in model container [2021-11-23 17:20:25,853 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:20:25" (3/3) ... [2021-11-23 17:20:25,854 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label05.c [2021-11-23 17:20:25,859 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:20:25,860 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 17:20:25,911 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:20:25,919 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 17:20:25,919 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 17:20:25,958 INFO L276 IsEmpty]: Start isEmpty. Operand has 878 states, 875 states have (on average 1.904) internal successors, (1666), 877 states have internal predecessors, (1666), 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 17:20:25,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 17:20:25,967 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:25,967 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:20:25,968 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:25,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:25,974 INFO L85 PathProgramCache]: Analyzing trace with hash 975463267, now seen corresponding path program 1 times [2021-11-23 17:20:25,987 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:25,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [400575115] [2021-11-23 17:20:25,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:25,989 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:25,989 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:25,992 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:26,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:20:26,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:26,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 17:20:26,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:26,293 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 17:20:26,293 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:20:26,294 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:26,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [400575115] [2021-11-23 17:20:26,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [400575115] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:20:26,296 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:20:26,296 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:20:26,298 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969945774] [2021-11-23 17:20:26,299 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:20:26,304 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 17:20:26,318 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:26,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 17:20:26,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:20:26,370 INFO L87 Difference]: Start difference. First operand has 878 states, 875 states have (on average 1.904) internal successors, (1666), 877 states have internal predecessors, (1666), 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 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 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 17:20:26,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:26,506 INFO L93 Difference]: Finished difference Result 1734 states and 3292 transitions. [2021-11-23 17:20:26,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 17:20:26,513 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 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 26 [2021-11-23 17:20:26,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:26,550 INFO L225 Difference]: With dead ends: 1734 [2021-11-23 17:20:26,550 INFO L226 Difference]: Without dead ends: 812 [2021-11-23 17:20:26,556 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:20:26,560 INFO L933 BasicCegarLoop]: 1600 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 1600 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:26,561 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 1600 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:20:26,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 812 states. [2021-11-23 17:20:26,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 812 to 812. [2021-11-23 17:20:26,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 812 states, 810 states have (on average 1.8925925925925926) internal successors, (1533), 811 states have internal predecessors, (1533), 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 17:20:26,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 812 states to 812 states and 1533 transitions. [2021-11-23 17:20:26,685 INFO L78 Accepts]: Start accepts. Automaton has 812 states and 1533 transitions. Word has length 26 [2021-11-23 17:20:26,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:26,686 INFO L470 AbstractCegarLoop]: Abstraction has 812 states and 1533 transitions. [2021-11-23 17:20:26,686 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 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 17:20:26,687 INFO L276 IsEmpty]: Start isEmpty. Operand 812 states and 1533 transitions. [2021-11-23 17:20:26,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 17:20:26,688 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:26,688 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:20:26,710 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:26,904 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:20:26,905 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:26,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:26,906 INFO L85 PathProgramCache]: Analyzing trace with hash 157814817, now seen corresponding path program 1 times [2021-11-23 17:20:26,909 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:26,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [317127314] [2021-11-23 17:20:26,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:26,910 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:26,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:26,913 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:26,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:20:27,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:27,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:20:27,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:27,191 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 17:20:27,191 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:20:27,191 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:27,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [317127314] [2021-11-23 17:20:27,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [317127314] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:20:27,192 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:20:27,192 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:20:27,193 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000165840] [2021-11-23 17:20:27,193 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:20:27,194 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:20:27,194 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:27,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:20:27,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:20:27,196 INFO L87 Difference]: Start difference. First operand 812 states and 1533 transitions. Second operand has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 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 17:20:27,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:27,408 INFO L93 Difference]: Finished difference Result 888 states and 1649 transitions. [2021-11-23 17:20:27,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:20:27,409 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 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 26 [2021-11-23 17:20:27,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:27,416 INFO L225 Difference]: With dead ends: 888 [2021-11-23 17:20:27,416 INFO L226 Difference]: Without dead ends: 848 [2021-11-23 17:20:27,417 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:20:27,419 INFO L933 BasicCegarLoop]: 1529 mSDtfsCounter, 58 mSDsluCounter, 4566 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 6095 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:27,420 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 6095 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:20:27,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 848 states. [2021-11-23 17:20:27,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 848 to 812. [2021-11-23 17:20:27,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 812 states, 810 states have (on average 1.8728395061728396) internal successors, (1517), 811 states have internal predecessors, (1517), 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 17:20:27,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 812 states to 812 states and 1517 transitions. [2021-11-23 17:20:27,455 INFO L78 Accepts]: Start accepts. Automaton has 812 states and 1517 transitions. Word has length 26 [2021-11-23 17:20:27,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:27,455 INFO L470 AbstractCegarLoop]: Abstraction has 812 states and 1517 transitions. [2021-11-23 17:20:27,456 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 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 17:20:27,456 INFO L276 IsEmpty]: Start isEmpty. Operand 812 states and 1517 transitions. [2021-11-23 17:20:27,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 17:20:27,458 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:27,459 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] [2021-11-23 17:20:27,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:27,673 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:20:27,673 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:27,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:27,674 INFO L85 PathProgramCache]: Analyzing trace with hash -1324654887, now seen corresponding path program 1 times [2021-11-23 17:20:27,676 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:27,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [810352669] [2021-11-23 17:20:27,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:27,678 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:27,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:27,680 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:27,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:20:27,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:27,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:20:27,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:27,952 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 17:20:27,953 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:20:27,953 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:27,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [810352669] [2021-11-23 17:20:27,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [810352669] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:20:27,954 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:20:27,954 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:20:27,954 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087308362] [2021-11-23 17:20:27,954 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:20:27,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:20:27,955 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:27,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:20:27,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:20:27,956 INFO L87 Difference]: Start difference. First operand 812 states and 1517 transitions. Second operand has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 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 17:20:28,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:28,057 INFO L93 Difference]: Finished difference Result 878 states and 1619 transitions. [2021-11-23 17:20:28,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:20:28,071 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 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 41 [2021-11-23 17:20:28,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:28,077 INFO L225 Difference]: With dead ends: 878 [2021-11-23 17:20:28,077 INFO L226 Difference]: Without dead ends: 842 [2021-11-23 17:20:28,078 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 39 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 17:20:28,080 INFO L933 BasicCegarLoop]: 1559 mSDtfsCounter, 1485 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1485 SdHoareTripleChecker+Valid, 1613 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:28,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1485 Valid, 1613 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:20:28,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 842 states. [2021-11-23 17:20:28,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 842 to 840. [2021-11-23 17:20:28,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 840 states, 838 states have (on average 1.8627684964200477) internal successors, (1561), 839 states have internal predecessors, (1561), 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 17:20:28,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 840 states to 840 states and 1561 transitions. [2021-11-23 17:20:28,141 INFO L78 Accepts]: Start accepts. Automaton has 840 states and 1561 transitions. Word has length 41 [2021-11-23 17:20:28,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:28,142 INFO L470 AbstractCegarLoop]: Abstraction has 840 states and 1561 transitions. [2021-11-23 17:20:28,142 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 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 17:20:28,142 INFO L276 IsEmpty]: Start isEmpty. Operand 840 states and 1561 transitions. [2021-11-23 17:20:28,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 17:20:28,144 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:28,144 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] [2021-11-23 17:20:28,173 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:28,369 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:20:28,369 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:28,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:28,370 INFO L85 PathProgramCache]: Analyzing trace with hash 1376027727, now seen corresponding path program 1 times [2021-11-23 17:20:28,370 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:28,371 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1435092445] [2021-11-23 17:20:28,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:28,371 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:28,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:28,373 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:28,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:20:28,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:28,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:20:28,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:29,144 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 17:20:29,145 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:20:29,145 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:29,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1435092445] [2021-11-23 17:20:29,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1435092445] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:20:29,146 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:20:29,146 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:20:29,146 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119975579] [2021-11-23 17:20:29,146 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:20:29,147 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:20:29,147 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:29,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:20:29,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:20:29,148 INFO L87 Difference]: Start difference. First operand 840 states and 1561 transitions. Second operand has 5 states, 5 states have (on average 8.2) internal successors, (41), 5 states have internal predecessors, (41), 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 17:20:29,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:29,344 INFO L93 Difference]: Finished difference Result 1096 states and 1961 transitions. [2021-11-23 17:20:29,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:20:29,346 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.2) internal successors, (41), 5 states have internal predecessors, (41), 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 41 [2021-11-23 17:20:29,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:29,355 INFO L225 Difference]: With dead ends: 1096 [2021-11-23 17:20:29,356 INFO L226 Difference]: Without dead ends: 1032 [2021-11-23 17:20:29,362 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 37 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 17:20:29,366 INFO L933 BasicCegarLoop]: 1511 mSDtfsCounter, 1678 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1678 SdHoareTripleChecker+Valid, 1680 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:29,367 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1678 Valid, 1680 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:20:29,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1032 states. [2021-11-23 17:20:29,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1032 to 964. [2021-11-23 17:20:29,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 964 states, 962 states have (on average 1.8222453222453223) internal successors, (1753), 963 states have internal predecessors, (1753), 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 17:20:29,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 964 states to 964 states and 1753 transitions. [2021-11-23 17:20:29,415 INFO L78 Accepts]: Start accepts. Automaton has 964 states and 1753 transitions. Word has length 41 [2021-11-23 17:20:29,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:29,415 INFO L470 AbstractCegarLoop]: Abstraction has 964 states and 1753 transitions. [2021-11-23 17:20:29,416 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.2) internal successors, (41), 5 states have internal predecessors, (41), 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 17:20:29,416 INFO L276 IsEmpty]: Start isEmpty. Operand 964 states and 1753 transitions. [2021-11-23 17:20:29,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 17:20:29,425 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:29,425 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] [2021-11-23 17:20:29,444 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:29,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:20:29,639 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:29,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:29,639 INFO L85 PathProgramCache]: Analyzing trace with hash -1902982177, now seen corresponding path program 1 times [2021-11-23 17:20:29,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:29,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [465980133] [2021-11-23 17:20:29,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:29,640 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:29,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:29,645 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:29,687 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:20:29,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:29,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:20:29,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:29,941 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 17:20:29,942 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:20:29,942 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:29,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [465980133] [2021-11-23 17:20:29,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [465980133] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:20:29,943 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:20:29,943 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:20:29,943 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438383536] [2021-11-23 17:20:29,943 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:20:29,944 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:20:29,944 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:29,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:20:29,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:20:29,945 INFO L87 Difference]: Start difference. First operand 964 states and 1753 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 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 17:20:30,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:30,029 INFO L93 Difference]: Finished difference Result 1242 states and 2182 transitions. [2021-11-23 17:20:30,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:20:30,030 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 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 43 [2021-11-23 17:20:30,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:30,039 INFO L225 Difference]: With dead ends: 1242 [2021-11-23 17:20:30,039 INFO L226 Difference]: Without dead ends: 1054 [2021-11-23 17:20:30,040 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 41 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 17:20:30,041 INFO L933 BasicCegarLoop]: 1514 mSDtfsCounter, 1469 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1469 SdHoareTripleChecker+Valid, 1565 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:30,042 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1469 Valid, 1565 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:20:30,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1054 states. [2021-11-23 17:20:30,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1054 to 1052. [2021-11-23 17:20:30,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1052 states, 1050 states have (on average 1.7942857142857143) internal successors, (1884), 1051 states have internal predecessors, (1884), 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 17:20:30,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1052 states to 1052 states and 1884 transitions. [2021-11-23 17:20:30,089 INFO L78 Accepts]: Start accepts. Automaton has 1052 states and 1884 transitions. Word has length 43 [2021-11-23 17:20:30,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:30,091 INFO L470 AbstractCegarLoop]: Abstraction has 1052 states and 1884 transitions. [2021-11-23 17:20:30,091 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 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 17:20:30,092 INFO L276 IsEmpty]: Start isEmpty. Operand 1052 states and 1884 transitions. [2021-11-23 17:20:30,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 17:20:30,093 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:30,093 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] [2021-11-23 17:20:30,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:30,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:20:30,307 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:30,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:30,308 INFO L85 PathProgramCache]: Analyzing trace with hash -47574589, now seen corresponding path program 1 times [2021-11-23 17:20:30,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:30,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2009280337] [2021-11-23 17:20:30,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:30,309 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:30,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:30,311 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:30,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:20:30,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:30,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:20:30,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:30,555 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 17:20:30,555 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:20:30,555 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:30,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2009280337] [2021-11-23 17:20:30,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2009280337] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:20:30,556 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:20:30,556 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:20:30,556 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376922877] [2021-11-23 17:20:30,556 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:20:30,557 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:20:30,557 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:30,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:20:30,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:20:30,558 INFO L87 Difference]: Start difference. First operand 1052 states and 1884 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 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 17:20:30,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:30,621 INFO L93 Difference]: Finished difference Result 1546 states and 2636 transitions. [2021-11-23 17:20:30,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:20:30,621 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 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 43 [2021-11-23 17:20:30,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:30,632 INFO L225 Difference]: With dead ends: 1546 [2021-11-23 17:20:30,632 INFO L226 Difference]: Without dead ends: 1272 [2021-11-23 17:20:30,633 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 41 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 17:20:30,634 INFO L933 BasicCegarLoop]: 1541 mSDtfsCounter, 1477 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1477 SdHoareTripleChecker+Valid, 1603 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:30,635 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1477 Valid, 1603 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:20:30,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1272 states. [2021-11-23 17:20:30,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1272 to 1270. [2021-11-23 17:20:30,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1270 states, 1268 states have (on average 1.7389589905362777) internal successors, (2205), 1269 states have internal predecessors, (2205), 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 17:20:30,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1270 states to 1270 states and 2205 transitions. [2021-11-23 17:20:30,692 INFO L78 Accepts]: Start accepts. Automaton has 1270 states and 2205 transitions. Word has length 43 [2021-11-23 17:20:30,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:30,693 INFO L470 AbstractCegarLoop]: Abstraction has 1270 states and 2205 transitions. [2021-11-23 17:20:30,693 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 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 17:20:30,693 INFO L276 IsEmpty]: Start isEmpty. Operand 1270 states and 2205 transitions. [2021-11-23 17:20:30,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 17:20:30,694 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:30,694 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] [2021-11-23 17:20:30,712 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:30,908 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:20:30,909 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:30,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:30,909 INFO L85 PathProgramCache]: Analyzing trace with hash 1199933027, now seen corresponding path program 1 times [2021-11-23 17:20:30,910 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:30,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [797988967] [2021-11-23 17:20:30,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:30,910 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:30,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:30,911 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:30,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:20:30,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:30,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:20:30,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:31,157 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 17:20:31,157 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:20:31,157 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:31,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [797988967] [2021-11-23 17:20:31,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [797988967] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:20:31,158 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:20:31,158 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:20:31,158 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012497140] [2021-11-23 17:20:31,158 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:20:31,159 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:20:31,159 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:31,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:20:31,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:20:31,160 INFO L87 Difference]: Start difference. First operand 1270 states and 2205 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 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 17:20:31,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:31,235 INFO L93 Difference]: Finished difference Result 2146 states and 3509 transitions. [2021-11-23 17:20:31,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:20:31,236 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 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 43 [2021-11-23 17:20:31,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:31,248 INFO L225 Difference]: With dead ends: 2146 [2021-11-23 17:20:31,248 INFO L226 Difference]: Without dead ends: 1654 [2021-11-23 17:20:31,250 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 41 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 17:20:31,251 INFO L933 BasicCegarLoop]: 1554 mSDtfsCounter, 1481 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1481 SdHoareTripleChecker+Valid, 1612 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:31,251 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1481 Valid, 1612 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:20:31,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1654 states. [2021-11-23 17:20:31,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1654 to 1652. [2021-11-23 17:20:31,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1652 states, 1650 states have (on average 1.6654545454545455) internal successors, (2748), 1651 states have internal predecessors, (2748), 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 17:20:31,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1652 states to 1652 states and 2748 transitions. [2021-11-23 17:20:31,359 INFO L78 Accepts]: Start accepts. Automaton has 1652 states and 2748 transitions. Word has length 43 [2021-11-23 17:20:31,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:31,359 INFO L470 AbstractCegarLoop]: Abstraction has 1652 states and 2748 transitions. [2021-11-23 17:20:31,360 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 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 17:20:31,360 INFO L276 IsEmpty]: Start isEmpty. Operand 1652 states and 2748 transitions. [2021-11-23 17:20:31,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 17:20:31,361 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:31,361 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] [2021-11-23 17:20:31,382 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:31,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:20:31,574 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:31,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:31,576 INFO L85 PathProgramCache]: Analyzing trace with hash -1511296967, now seen corresponding path program 1 times [2021-11-23 17:20:31,576 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:31,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1393424732] [2021-11-23 17:20:31,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:31,577 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:31,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:31,578 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:31,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:20:31,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:31,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:20:31,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:31,771 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 17:20:31,771 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:20:31,772 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:31,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1393424732] [2021-11-23 17:20:31,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1393424732] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:20:31,772 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:20:31,773 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:20:31,773 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636236700] [2021-11-23 17:20:31,773 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:20:31,774 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:20:31,774 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:31,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:20:31,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:20:31,775 INFO L87 Difference]: Start difference. First operand 1652 states and 2748 transitions. Second operand has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 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 17:20:31,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:31,988 INFO L93 Difference]: Finished difference Result 2498 states and 3940 transitions. [2021-11-23 17:20:31,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:20:31,989 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 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 44 [2021-11-23 17:20:31,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:32,006 INFO L225 Difference]: With dead ends: 2498 [2021-11-23 17:20:32,007 INFO L226 Difference]: Without dead ends: 2496 [2021-11-23 17:20:32,008 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:20:32,009 INFO L933 BasicCegarLoop]: 1534 mSDtfsCounter, 139 mSDsluCounter, 4544 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 6078 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:32,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 6078 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:20:32,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2496 states. [2021-11-23 17:20:32,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2496 to 1736. [2021-11-23 17:20:32,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1736 states, 1734 states have (on average 1.6309111880046137) internal successors, (2828), 1735 states have internal predecessors, (2828), 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 17:20:32,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1736 states to 1736 states and 2828 transitions. [2021-11-23 17:20:32,114 INFO L78 Accepts]: Start accepts. Automaton has 1736 states and 2828 transitions. Word has length 44 [2021-11-23 17:20:32,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:32,114 INFO L470 AbstractCegarLoop]: Abstraction has 1736 states and 2828 transitions. [2021-11-23 17:20:32,114 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 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 17:20:32,115 INFO L276 IsEmpty]: Start isEmpty. Operand 1736 states and 2828 transitions. [2021-11-23 17:20:32,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 17:20:32,116 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:32,116 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:20:32,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:32,331 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:20:32,332 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:32,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:32,332 INFO L85 PathProgramCache]: Analyzing trace with hash -1100178715, now seen corresponding path program 1 times [2021-11-23 17:20:32,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:32,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [890084997] [2021-11-23 17:20:32,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:32,333 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:32,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:32,335 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:32,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:20:32,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:32,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:20:32,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:32,679 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 17:20:32,679 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:20:32,679 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:32,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [890084997] [2021-11-23 17:20:32,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [890084997] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:20:32,680 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:20:32,680 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:20:32,680 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902024394] [2021-11-23 17:20:32,680 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:20:32,681 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:20:32,681 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:32,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:20:32,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:20:32,682 INFO L87 Difference]: Start difference. First operand 1736 states and 2828 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 2 states have internal predecessors, (60), 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 17:21:12,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:12,940 INFO L93 Difference]: Finished difference Result 3240 states and 5701 transitions. [2021-11-23 17:21:12,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:21:12,941 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 2 states have internal predecessors, (60), 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 60 [2021-11-23 17:21:12,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:12,960 INFO L225 Difference]: With dead ends: 3240 [2021-11-23 17:21:12,960 INFO L226 Difference]: Without dead ends: 2487 [2021-11-23 17:21:12,962 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 58 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 17:21:12,963 INFO L933 BasicCegarLoop]: 618 mSDtfsCounter, 814 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2197 mSolverCounterSat, 664 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 33.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 814 SdHoareTripleChecker+Valid, 625 SdHoareTripleChecker+Invalid, 2861 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 664 IncrementalHoareTripleChecker+Valid, 2197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 40.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:12,963 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [814 Valid, 625 Invalid, 2861 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [664 Valid, 2197 Invalid, 0 Unknown, 0 Unchecked, 40.1s Time] [2021-11-23 17:21:12,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2487 states. [2021-11-23 17:21:13,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2487 to 2487. [2021-11-23 17:21:13,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2487 states, 2485 states have (on average 1.5030181086519114) internal successors, (3735), 2486 states have internal predecessors, (3735), 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 17:21:13,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2487 states to 2487 states and 3735 transitions. [2021-11-23 17:21:13,081 INFO L78 Accepts]: Start accepts. Automaton has 2487 states and 3735 transitions. Word has length 60 [2021-11-23 17:21:13,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:13,082 INFO L470 AbstractCegarLoop]: Abstraction has 2487 states and 3735 transitions. [2021-11-23 17:21:13,083 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 2 states have internal predecessors, (60), 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 17:21:13,083 INFO L276 IsEmpty]: Start isEmpty. Operand 2487 states and 3735 transitions. [2021-11-23 17:21:13,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:21:13,084 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:13,085 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:21:13,106 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:13,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:21:13,302 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:13,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:13,303 INFO L85 PathProgramCache]: Analyzing trace with hash -213997176, now seen corresponding path program 1 times [2021-11-23 17:21:13,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:13,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [327439538] [2021-11-23 17:21:13,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:13,304 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:13,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:13,305 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:13,347 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:21:13,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:13,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:13,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:14,881 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:14,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:15,831 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:15,832 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:15,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [327439538] [2021-11-23 17:21:15,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [327439538] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:15,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2071926746] [2021-11-23 17:21:15,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:15,833 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:15,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:21:15,838 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:21:15,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-11-23 17:21:15,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:15,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:21:15,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:16,159 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:16,159 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:21:16,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2071926746] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:21:16,160 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:21:16,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 17:21:16,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654525864] [2021-11-23 17:21:16,160 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:21:16,161 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:21:16,161 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:16,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:21:16,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:21:16,168 INFO L87 Difference]: Start difference. First operand 2487 states and 3735 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 17:21:16,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:16,250 INFO L93 Difference]: Finished difference Result 3447 states and 5101 transitions. [2021-11-23 17:21:16,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:21:16,251 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 64 [2021-11-23 17:21:16,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:16,268 INFO L225 Difference]: With dead ends: 3447 [2021-11-23 17:21:16,268 INFO L226 Difference]: Without dead ends: 2489 [2021-11-23 17:21:16,271 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:21:16,272 INFO L933 BasicCegarLoop]: 1538 mSDtfsCounter, 33 mSDsluCounter, 1504 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 3042 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:16,273 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 3042 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:21:16,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2489 states. [2021-11-23 17:21:16,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2489 to 2487. [2021-11-23 17:21:16,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2487 states, 2485 states have (on average 1.495774647887324) internal successors, (3717), 2486 states have internal predecessors, (3717), 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 17:21:16,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2487 states to 2487 states and 3717 transitions. [2021-11-23 17:21:16,386 INFO L78 Accepts]: Start accepts. Automaton has 2487 states and 3717 transitions. Word has length 64 [2021-11-23 17:21:16,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:16,387 INFO L470 AbstractCegarLoop]: Abstraction has 2487 states and 3717 transitions. [2021-11-23 17:21:16,387 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 17:21:16,387 INFO L276 IsEmpty]: Start isEmpty. Operand 2487 states and 3717 transitions. [2021-11-23 17:21:16,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:21:16,388 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:16,390 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:21:16,408 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:16,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:16,803 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:16,804 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:16,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:16,804 INFO L85 PathProgramCache]: Analyzing trace with hash 1584307858, now seen corresponding path program 1 times [2021-11-23 17:21:16,804 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:16,805 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [663496125] [2021-11-23 17:21:16,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:16,805 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:16,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:16,806 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:16,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 17:21:16,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:16,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:16,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:18,089 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:18,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:18,970 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:18,970 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:18,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [663496125] [2021-11-23 17:21:18,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [663496125] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:18,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1941645483] [2021-11-23 17:21:18,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:18,971 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:18,971 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:21:18,977 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:21:18,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-23 17:21:19,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:19,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:19,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:19,936 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:19,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:20,526 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:20,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1941645483] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:20,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [505647376] [2021-11-23 17:21:20,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:20,527 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:20,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:21:20,534 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:21:20,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 17:21:20,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:20,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:20,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:21,610 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:21,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:22,268 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:22,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [505647376] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:22,269 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:21:22,269 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:21:22,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130687426] [2021-11-23 17:21:22,270 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:21:22,271 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:21:22,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:22,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:21:22,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:21:22,272 INFO L87 Difference]: Start difference. First operand 2487 states and 3717 transitions. Second operand has 16 states, 16 states have (on average 6.9375) internal successors, (111), 15 states have internal predecessors, (111), 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 17:21:22,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:22,755 INFO L93 Difference]: Finished difference Result 3184 states and 4707 transitions. [2021-11-23 17:21:22,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:21:22,756 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 6.9375) internal successors, (111), 15 states have internal predecessors, (111), 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 64 [2021-11-23 17:21:22,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:22,772 INFO L225 Difference]: With dead ends: 3184 [2021-11-23 17:21:22,773 INFO L226 Difference]: Without dead ends: 2510 [2021-11-23 17:21:22,775 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 364 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:21:22,776 INFO L933 BasicCegarLoop]: 1502 mSDtfsCounter, 7271 mSDsluCounter, 7609 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7271 SdHoareTripleChecker+Valid, 9111 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 53 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:22,776 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7271 Valid, 9111 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 47 Invalid, 0 Unknown, 53 Unchecked, 0.1s Time] [2021-11-23 17:21:22,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2510 states. [2021-11-23 17:21:22,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2510 to 2509. [2021-11-23 17:21:22,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2509 states, 2507 states have (on average 1.4930195452732349) internal successors, (3743), 2508 states have internal predecessors, (3743), 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 17:21:22,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2509 states to 2509 states and 3743 transitions. [2021-11-23 17:21:22,884 INFO L78 Accepts]: Start accepts. Automaton has 2509 states and 3743 transitions. Word has length 64 [2021-11-23 17:21:22,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:22,884 INFO L470 AbstractCegarLoop]: Abstraction has 2509 states and 3743 transitions. [2021-11-23 17:21:22,885 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 6.9375) internal successors, (111), 15 states have internal predecessors, (111), 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 17:21:22,885 INFO L276 IsEmpty]: Start isEmpty. Operand 2509 states and 3743 transitions. [2021-11-23 17:21:22,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:21:22,886 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:22,886 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:21:22,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:23,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:23,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:23,509 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:23,509 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:23,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:23,509 INFO L85 PathProgramCache]: Analyzing trace with hash -2129817016, now seen corresponding path program 1 times [2021-11-23 17:21:23,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:23,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1254140737] [2021-11-23 17:21:23,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:23,510 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:23,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:23,512 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:23,549 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 17:21:23,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:23,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:23,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:25,180 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:25,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:25,801 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:25,801 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:25,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1254140737] [2021-11-23 17:21:25,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1254140737] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:25,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1735596218] [2021-11-23 17:21:25,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:25,802 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:25,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:21:25,807 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:21:25,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-23 17:21:25,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:25,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:21:25,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:26,089 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:26,089 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:21:26,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1735596218] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:21:26,090 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:21:26,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 17:21:26,090 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69705283] [2021-11-23 17:21:26,090 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:21:26,091 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:21:26,091 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:26,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:21:26,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:21:26,092 INFO L87 Difference]: Start difference. First operand 2509 states and 3743 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 17:21:26,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:26,182 INFO L93 Difference]: Finished difference Result 2991 states and 4418 transitions. [2021-11-23 17:21:26,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:21:26,182 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 64 [2021-11-23 17:21:26,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:26,196 INFO L225 Difference]: With dead ends: 2991 [2021-11-23 17:21:26,196 INFO L226 Difference]: Without dead ends: 2033 [2021-11-23 17:21:26,198 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:21:26,199 INFO L933 BasicCegarLoop]: 1531 mSDtfsCounter, 27 mSDsluCounter, 1496 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 3027 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:26,200 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 3027 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:21:26,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2033 states. [2021-11-23 17:21:26,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2033 to 2031. [2021-11-23 17:21:26,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2031 states, 2029 states have (on average 1.5086249383932973) internal successors, (3061), 2030 states have internal predecessors, (3061), 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 17:21:26,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2031 states to 2031 states and 3061 transitions. [2021-11-23 17:21:26,282 INFO L78 Accepts]: Start accepts. Automaton has 2031 states and 3061 transitions. Word has length 64 [2021-11-23 17:21:26,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:26,283 INFO L470 AbstractCegarLoop]: Abstraction has 2031 states and 3061 transitions. [2021-11-23 17:21:26,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 17:21:26,283 INFO L276 IsEmpty]: Start isEmpty. Operand 2031 states and 3061 transitions. [2021-11-23 17:21:26,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:21:26,287 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:26,288 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:21:26,307 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:26,509 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:26,703 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:26,703 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:26,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:26,704 INFO L85 PathProgramCache]: Analyzing trace with hash 947164882, now seen corresponding path program 1 times [2021-11-23 17:21:26,704 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:26,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1470094727] [2021-11-23 17:21:26,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:26,704 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:26,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:26,706 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:26,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 17:21:26,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:26,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:26,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:28,473 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:28,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:29,101 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:29,101 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:29,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1470094727] [2021-11-23 17:21:29,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1470094727] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:29,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1494156570] [2021-11-23 17:21:29,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:29,102 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:29,102 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:21:29,107 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:21:29,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-23 17:21:29,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:29,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:29,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:30,506 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:30,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:30,915 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:30,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1494156570] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:30,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1069638315] [2021-11-23 17:21:30,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:30,916 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:30,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:21:30,922 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:21:30,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 17:21:31,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:31,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:31,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:32,168 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:32,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:32,587 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:32,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1069638315] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:32,588 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:21:32,588 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:21:32,589 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195304273] [2021-11-23 17:21:32,589 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:21:32,589 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:21:32,590 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:32,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:21:32,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:21:32,591 INFO L87 Difference]: Start difference. First operand 2031 states and 3061 transitions. Second operand has 16 states, 16 states have (on average 7.3125) internal successors, (117), 15 states have internal predecessors, (117), 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 17:21:33,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:33,062 INFO L93 Difference]: Finished difference Result 2398 states and 3570 transitions. [2021-11-23 17:21:33,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:21:33,063 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.3125) internal successors, (117), 15 states have internal predecessors, (117), 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 64 [2021-11-23 17:21:33,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:33,077 INFO L225 Difference]: With dead ends: 2398 [2021-11-23 17:21:33,077 INFO L226 Difference]: Without dead ends: 2060 [2021-11-23 17:21:33,079 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 364 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:21:33,080 INFO L933 BasicCegarLoop]: 1500 mSDtfsCounter, 5847 mSDsluCounter, 10537 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5847 SdHoareTripleChecker+Valid, 12037 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 83 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:33,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5847 Valid, 12037 Invalid, 158 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [4 Valid, 71 Invalid, 0 Unknown, 83 Unchecked, 0.1s Time] [2021-11-23 17:21:33,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2060 states. [2021-11-23 17:21:33,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2060 to 2041. [2021-11-23 17:21:33,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2041 states, 2039 states have (on average 1.5071113290828837) internal successors, (3073), 2040 states have internal predecessors, (3073), 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 17:21:33,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2041 states to 2041 states and 3073 transitions. [2021-11-23 17:21:33,163 INFO L78 Accepts]: Start accepts. Automaton has 2041 states and 3073 transitions. Word has length 64 [2021-11-23 17:21:33,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:33,164 INFO L470 AbstractCegarLoop]: Abstraction has 2041 states and 3073 transitions. [2021-11-23 17:21:33,164 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.3125) internal successors, (117), 15 states have internal predecessors, (117), 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 17:21:33,164 INFO L276 IsEmpty]: Start isEmpty. Operand 2041 states and 3073 transitions. [2021-11-23 17:21:33,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:21:33,170 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:33,170 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:21:33,191 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:33,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:33,610 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:33,786 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:33,786 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:33,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:33,786 INFO L85 PathProgramCache]: Analyzing trace with hash -1514914168, now seen corresponding path program 1 times [2021-11-23 17:21:33,787 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:33,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1777887591] [2021-11-23 17:21:33,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:33,787 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:33,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:33,788 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:33,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 17:21:33,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:33,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:21:33,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:34,038 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:34,038 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:21:34,038 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:34,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1777887591] [2021-11-23 17:21:34,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1777887591] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:21:34,038 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:21:34,039 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:21:34,039 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150025702] [2021-11-23 17:21:34,039 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:21:34,039 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:21:34,039 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:34,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:21:34,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:21:34,040 INFO L87 Difference]: Start difference. First operand 2041 states and 3073 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 17:21:34,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:34,081 INFO L93 Difference]: Finished difference Result 2233 states and 3335 transitions. [2021-11-23 17:21:34,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:21:34,082 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 64 [2021-11-23 17:21:34,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:34,105 INFO L225 Difference]: With dead ends: 2233 [2021-11-23 17:21:34,111 INFO L226 Difference]: Without dead ends: 1753 [2021-11-23 17:21:34,113 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 62 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 17:21:34,114 INFO L933 BasicCegarLoop]: 1525 mSDtfsCounter, 17 mSDsluCounter, 1496 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 3021 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:34,114 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 3021 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:21:34,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1753 states. [2021-11-23 17:21:34,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1753 to 1745. [2021-11-23 17:21:34,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1745 states, 1743 states have (on average 1.5249569707401032) internal successors, (2658), 1744 states have internal predecessors, (2658), 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 17:21:34,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1745 states to 1745 states and 2658 transitions. [2021-11-23 17:21:34,178 INFO L78 Accepts]: Start accepts. Automaton has 1745 states and 2658 transitions. Word has length 64 [2021-11-23 17:21:34,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:34,179 INFO L470 AbstractCegarLoop]: Abstraction has 1745 states and 2658 transitions. [2021-11-23 17:21:34,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 17:21:34,179 INFO L276 IsEmpty]: Start isEmpty. Operand 1745 states and 2658 transitions. [2021-11-23 17:21:34,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:21:34,180 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:34,180 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:21:34,201 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:34,394 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:21:34,395 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:34,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:34,395 INFO L85 PathProgramCache]: Analyzing trace with hash -2009059564, now seen corresponding path program 1 times [2021-11-23 17:21:34,395 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:34,395 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1036369501] [2021-11-23 17:21:34,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:34,395 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:34,396 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:34,396 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:34,398 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:21:34,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:34,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:21:34,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:34,903 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:21:34,903 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:21:34,903 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:34,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1036369501] [2021-11-23 17:21:34,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1036369501] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:21:34,904 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:21:34,904 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:21:34,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608113677] [2021-11-23 17:21:34,904 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:21:34,904 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:21:34,904 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:34,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:21:34,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:21:34,905 INFO L87 Difference]: Start difference. First operand 1745 states and 2658 transitions. Second operand has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 5 states have internal predecessors, (61), 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 17:21:34,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:34,986 INFO L93 Difference]: Finished difference Result 1921 states and 2899 transitions. [2021-11-23 17:21:34,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:21:34,987 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 5 states have internal predecessors, (61), 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 64 [2021-11-23 17:21:34,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:34,992 INFO L225 Difference]: With dead ends: 1921 [2021-11-23 17:21:34,993 INFO L226 Difference]: Without dead ends: 1745 [2021-11-23 17:21:34,994 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:21:34,995 INFO L933 BasicCegarLoop]: 1506 mSDtfsCounter, 2899 mSDsluCounter, 1510 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2899 SdHoareTripleChecker+Valid, 3016 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 14 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:34,995 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2899 Valid, 3016 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 13 Invalid, 0 Unknown, 14 Unchecked, 0.0s Time] [2021-11-23 17:21:34,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1745 states. [2021-11-23 17:21:35,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1745 to 1745. [2021-11-23 17:21:35,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1745 states, 1743 states have (on average 1.5243832472748136) internal successors, (2657), 1744 states have internal predecessors, (2657), 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 17:21:35,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1745 states to 1745 states and 2657 transitions. [2021-11-23 17:21:35,081 INFO L78 Accepts]: Start accepts. Automaton has 1745 states and 2657 transitions. Word has length 64 [2021-11-23 17:21:35,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:35,081 INFO L470 AbstractCegarLoop]: Abstraction has 1745 states and 2657 transitions. [2021-11-23 17:21:35,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 5 states have internal predecessors, (61), 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 17:21:35,082 INFO L276 IsEmpty]: Start isEmpty. Operand 1745 states and 2657 transitions. [2021-11-23 17:21:35,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:21:35,083 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:35,083 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:21:35,098 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:35,298 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:21:35,298 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:35,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:35,299 INFO L85 PathProgramCache]: Analyzing trace with hash 740302356, now seen corresponding path program 1 times [2021-11-23 17:21:35,299 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:35,300 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1605232301] [2021-11-23 17:21:35,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:35,300 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:35,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:35,301 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:35,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 17:21:35,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:35,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:21:35,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:35,860 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:21:35,860 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:21:35,861 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:35,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1605232301] [2021-11-23 17:21:35,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1605232301] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:21:35,861 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:21:35,861 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:21:35,862 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155217537] [2021-11-23 17:21:35,862 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:21:35,862 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:21:35,863 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:35,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:21:35,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:21:35,864 INFO L87 Difference]: Start difference. First operand 1745 states and 2657 transitions. Second operand has 6 states, 6 states have (on average 10.0) internal successors, (60), 5 states have internal predecessors, (60), 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 17:21:35,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:35,974 INFO L93 Difference]: Finished difference Result 1925 states and 2903 transitions. [2021-11-23 17:21:35,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:21:35,975 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.0) internal successors, (60), 5 states have internal predecessors, (60), 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 64 [2021-11-23 17:21:35,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:35,980 INFO L225 Difference]: With dead ends: 1925 [2021-11-23 17:21:35,981 INFO L226 Difference]: Without dead ends: 1745 [2021-11-23 17:21:35,982 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:21:35,984 INFO L933 BasicCegarLoop]: 1509 mSDtfsCounter, 2902 mSDsluCounter, 1505 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2902 SdHoareTripleChecker+Valid, 3014 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 11 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:35,985 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2902 Valid, 3014 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 11 Unchecked, 0.0s Time] [2021-11-23 17:21:35,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1745 states. [2021-11-23 17:21:36,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1745 to 1745. [2021-11-23 17:21:36,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1745 states, 1743 states have (on average 1.5238095238095237) internal successors, (2656), 1744 states have internal predecessors, (2656), 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 17:21:36,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1745 states to 1745 states and 2656 transitions. [2021-11-23 17:21:36,038 INFO L78 Accepts]: Start accepts. Automaton has 1745 states and 2656 transitions. Word has length 64 [2021-11-23 17:21:36,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:36,039 INFO L470 AbstractCegarLoop]: Abstraction has 1745 states and 2656 transitions. [2021-11-23 17:21:36,039 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.0) internal successors, (60), 5 states have internal predecessors, (60), 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 17:21:36,039 INFO L276 IsEmpty]: Start isEmpty. Operand 1745 states and 2656 transitions. [2021-11-23 17:21:36,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:21:36,040 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:36,041 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:21:36,062 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:36,254 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:21:36,254 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:36,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:36,255 INFO L85 PathProgramCache]: Analyzing trace with hash -261059308, now seen corresponding path program 1 times [2021-11-23 17:21:36,255 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:36,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [7570018] [2021-11-23 17:21:36,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:36,256 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:36,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:36,257 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:36,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:21:36,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:36,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:21:36,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:36,844 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:21:36,845 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:21:36,845 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:36,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [7570018] [2021-11-23 17:21:36,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [7570018] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:21:36,845 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:21:36,845 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:21:36,846 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761596975] [2021-11-23 17:21:36,846 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:21:36,846 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:21:36,846 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:36,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:21:36,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:21:36,847 INFO L87 Difference]: Start difference. First operand 1745 states and 2656 transitions. Second operand has 6 states, 6 states have (on average 9.833333333333334) internal successors, (59), 5 states have internal predecessors, (59), 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 17:21:36,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:36,978 INFO L93 Difference]: Finished difference Result 1915 states and 2891 transitions. [2021-11-23 17:21:36,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:21:36,979 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.833333333333334) internal successors, (59), 5 states have internal predecessors, (59), 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 64 [2021-11-23 17:21:36,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:36,984 INFO L225 Difference]: With dead ends: 1915 [2021-11-23 17:21:36,984 INFO L226 Difference]: Without dead ends: 1731 [2021-11-23 17:21:36,985 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:21:36,987 INFO L933 BasicCegarLoop]: 1512 mSDtfsCounter, 1457 mSDsluCounter, 3040 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1457 SdHoareTripleChecker+Valid, 4552 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 49 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:36,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1457 Valid, 4552 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 49 Unchecked, 0.1s Time] [2021-11-23 17:21:36,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1731 states. [2021-11-23 17:21:37,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1731 to 1731. [2021-11-23 17:21:37,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1731 states, 1729 states have (on average 1.5263157894736843) internal successors, (2639), 1730 states have internal predecessors, (2639), 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 17:21:37,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1731 states to 1731 states and 2639 transitions. [2021-11-23 17:21:37,057 INFO L78 Accepts]: Start accepts. Automaton has 1731 states and 2639 transitions. Word has length 64 [2021-11-23 17:21:37,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:37,058 INFO L470 AbstractCegarLoop]: Abstraction has 1731 states and 2639 transitions. [2021-11-23 17:21:37,058 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.833333333333334) internal successors, (59), 5 states have internal predecessors, (59), 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 17:21:37,058 INFO L276 IsEmpty]: Start isEmpty. Operand 1731 states and 2639 transitions. [2021-11-23 17:21:37,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 17:21:37,059 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:37,059 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:21:37,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:37,273 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:21:37,274 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:37,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:37,274 INFO L85 PathProgramCache]: Analyzing trace with hash -2023735102, now seen corresponding path program 1 times [2021-11-23 17:21:37,275 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:37,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [891039111] [2021-11-23 17:21:37,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:37,276 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:37,276 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:37,277 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:37,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 17:21:37,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:37,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:37,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:38,804 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:38,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:39,522 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:39,523 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:39,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [891039111] [2021-11-23 17:21:39,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [891039111] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:39,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [812364133] [2021-11-23 17:21:39,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:39,524 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:39,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:21:39,527 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:21:39,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-23 17:21:39,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:39,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:39,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:40,896 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:40,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:41,358 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:41,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [812364133] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:41,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668787015] [2021-11-23 17:21:41,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:41,359 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:41,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:21:41,361 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:21:41,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-23 17:21:41,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:41,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:41,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:42,614 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:42,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:43,076 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:43,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [668787015] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:43,077 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:21:43,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:21:43,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924799997] [2021-11-23 17:21:43,077 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:21:43,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:21:43,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:43,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:21:43,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:21:43,079 INFO L87 Difference]: Start difference. First operand 1731 states and 2639 transitions. Second operand has 16 states, 16 states have (on average 7.6875) internal successors, (123), 15 states have internal predecessors, (123), 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 17:21:43,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:43,408 INFO L93 Difference]: Finished difference Result 1913 states and 2892 transitions. [2021-11-23 17:21:43,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:21:43,409 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.6875) internal successors, (123), 15 states have internal predecessors, (123), 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 65 [2021-11-23 17:21:43,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:43,413 INFO L225 Difference]: With dead ends: 1913 [2021-11-23 17:21:43,413 INFO L226 Difference]: Without dead ends: 1743 [2021-11-23 17:21:43,414 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 370 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:21:43,414 INFO L933 BasicCegarLoop]: 1500 mSDtfsCounter, 5831 mSDsluCounter, 10548 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5831 SdHoareTripleChecker+Valid, 12048 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 62 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:43,414 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5831 Valid, 12048 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 47 Invalid, 0 Unknown, 62 Unchecked, 0.1s Time] [2021-11-23 17:21:43,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1743 states. [2021-11-23 17:21:43,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1743 to 1743. [2021-11-23 17:21:43,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1743 states, 1741 states have (on average 1.5249856404365307) internal successors, (2655), 1742 states have internal predecessors, (2655), 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 17:21:43,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1743 states to 1743 states and 2655 transitions. [2021-11-23 17:21:43,462 INFO L78 Accepts]: Start accepts. Automaton has 1743 states and 2655 transitions. Word has length 65 [2021-11-23 17:21:43,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:43,463 INFO L470 AbstractCegarLoop]: Abstraction has 1743 states and 2655 transitions. [2021-11-23 17:21:43,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.6875) internal successors, (123), 15 states have internal predecessors, (123), 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 17:21:43,463 INFO L276 IsEmpty]: Start isEmpty. Operand 1743 states and 2655 transitions. [2021-11-23 17:21:43,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 17:21:43,465 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:43,465 INFO L514 BasicCegarLoop]: trace histogram [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 17:21:43,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:43,708 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:43,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:44,084 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:44,085 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:44,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:44,085 INFO L85 PathProgramCache]: Analyzing trace with hash -94088951, now seen corresponding path program 1 times [2021-11-23 17:21:44,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:44,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1959565133] [2021-11-23 17:21:44,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:44,086 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:44,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:44,087 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:44,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 17:21:44,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:44,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:21:44,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:44,635 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:21:44,635 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:21:44,636 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:44,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1959565133] [2021-11-23 17:21:44,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1959565133] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:21:44,636 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:21:44,637 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:21:44,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871865606] [2021-11-23 17:21:44,637 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:21:44,637 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:21:44,638 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:44,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:21:44,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:21:44,639 INFO L87 Difference]: Start difference. First operand 1743 states and 2655 transitions. Second operand has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 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 17:21:44,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:44,804 INFO L93 Difference]: Finished difference Result 1979 states and 2977 transitions. [2021-11-23 17:21:44,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:21:44,806 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 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 66 [2021-11-23 17:21:44,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:44,811 INFO L225 Difference]: With dead ends: 1979 [2021-11-23 17:21:44,811 INFO L226 Difference]: Without dead ends: 1809 [2021-11-23 17:21:44,812 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 62 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 17:21:44,813 INFO L933 BasicCegarLoop]: 1569 mSDtfsCounter, 3060 mSDsluCounter, 1611 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3060 SdHoareTripleChecker+Valid, 3180 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:44,814 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3060 Valid, 3180 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:21:44,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1809 states. [2021-11-23 17:21:44,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1809 to 1743. [2021-11-23 17:21:44,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1743 states, 1741 states have (on average 1.5215393452039059) internal successors, (2649), 1742 states have internal predecessors, (2649), 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 17:21:44,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1743 states to 1743 states and 2649 transitions. [2021-11-23 17:21:44,863 INFO L78 Accepts]: Start accepts. Automaton has 1743 states and 2649 transitions. Word has length 66 [2021-11-23 17:21:44,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:44,864 INFO L470 AbstractCegarLoop]: Abstraction has 1743 states and 2649 transitions. [2021-11-23 17:21:44,864 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 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 17:21:44,864 INFO L276 IsEmpty]: Start isEmpty. Operand 1743 states and 2649 transitions. [2021-11-23 17:21:44,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 17:21:44,865 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:44,866 INFO L514 BasicCegarLoop]: trace histogram [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 17:21:44,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:45,080 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:21:45,080 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:45,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:45,081 INFO L85 PathProgramCache]: Analyzing trace with hash 1408270156, now seen corresponding path program 1 times [2021-11-23 17:21:45,081 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:45,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1010517154] [2021-11-23 17:21:45,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:45,082 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:45,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:45,084 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:45,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 17:21:45,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:45,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:21:45,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:45,647 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:21:45,647 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:21:45,648 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:45,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1010517154] [2021-11-23 17:21:45,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1010517154] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:21:45,648 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:21:45,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:21:45,649 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108642973] [2021-11-23 17:21:45,649 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:21:45,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:21:45,650 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:45,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:21:45,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:21:45,651 INFO L87 Difference]: Start difference. First operand 1743 states and 2649 transitions. Second operand has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 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 17:21:45,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:45,812 INFO L93 Difference]: Finished difference Result 1923 states and 2897 transitions. [2021-11-23 17:21:45,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:21:45,813 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 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 66 [2021-11-23 17:21:45,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:45,816 INFO L225 Difference]: With dead ends: 1923 [2021-11-23 17:21:45,816 INFO L226 Difference]: Without dead ends: 1865 [2021-11-23 17:21:45,817 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 62 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 17:21:45,818 INFO L933 BasicCegarLoop]: 1575 mSDtfsCounter, 1601 mSDsluCounter, 1645 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1601 SdHoareTripleChecker+Valid, 3220 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:45,818 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1601 Valid, 3220 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:21:45,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1865 states. [2021-11-23 17:21:45,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1865 to 1803. [2021-11-23 17:21:45,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1803 states, 1801 states have (on average 1.5141588006662965) internal successors, (2727), 1802 states have internal predecessors, (2727), 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 17:21:45,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1803 states to 1803 states and 2727 transitions. [2021-11-23 17:21:45,855 INFO L78 Accepts]: Start accepts. Automaton has 1803 states and 2727 transitions. Word has length 66 [2021-11-23 17:21:45,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:45,855 INFO L470 AbstractCegarLoop]: Abstraction has 1803 states and 2727 transitions. [2021-11-23 17:21:45,855 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 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 17:21:45,855 INFO L276 IsEmpty]: Start isEmpty. Operand 1803 states and 2727 transitions. [2021-11-23 17:21:45,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 17:21:45,856 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:45,856 INFO L514 BasicCegarLoop]: trace histogram [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 17:21:45,866 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:46,057 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:21:46,057 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:46,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:46,057 INFO L85 PathProgramCache]: Analyzing trace with hash 52806377, now seen corresponding path program 1 times [2021-11-23 17:21:46,058 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:46,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1666382213] [2021-11-23 17:21:46,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:46,058 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:46,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:46,059 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:46,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 17:21:46,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:46,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:21:46,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:46,614 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:21:46,614 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:21:46,615 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:46,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1666382213] [2021-11-23 17:21:46,615 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1666382213] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:21:46,615 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:21:46,615 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:21:46,615 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111599915] [2021-11-23 17:21:46,615 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:21:46,616 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:21:46,616 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:46,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:21:46,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:21:46,617 INFO L87 Difference]: Start difference. First operand 1803 states and 2727 transitions. Second operand has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 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 17:21:46,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:46,787 INFO L93 Difference]: Finished difference Result 1983 states and 2975 transitions. [2021-11-23 17:21:46,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:21:46,788 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 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 66 [2021-11-23 17:21:46,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:46,793 INFO L225 Difference]: With dead ends: 1983 [2021-11-23 17:21:46,793 INFO L226 Difference]: Without dead ends: 1925 [2021-11-23 17:21:46,794 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 62 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 17:21:46,795 INFO L933 BasicCegarLoop]: 1572 mSDtfsCounter, 1594 mSDsluCounter, 1667 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1594 SdHoareTripleChecker+Valid, 3239 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:46,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1594 Valid, 3239 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:21:46,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1925 states. [2021-11-23 17:21:46,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1925 to 1863. [2021-11-23 17:21:46,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1863 states, 1861 states have (on average 1.507254164427727) internal successors, (2805), 1862 states have internal predecessors, (2805), 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 17:21:46,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1863 states to 1863 states and 2805 transitions. [2021-11-23 17:21:46,852 INFO L78 Accepts]: Start accepts. Automaton has 1863 states and 2805 transitions. Word has length 66 [2021-11-23 17:21:46,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:46,852 INFO L470 AbstractCegarLoop]: Abstraction has 1863 states and 2805 transitions. [2021-11-23 17:21:46,852 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 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 17:21:46,853 INFO L276 IsEmpty]: Start isEmpty. Operand 1863 states and 2805 transitions. [2021-11-23 17:21:46,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 17:21:46,862 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:46,862 INFO L514 BasicCegarLoop]: trace histogram [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 17:21:46,877 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:47,077 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:21:47,077 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:47,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:47,078 INFO L85 PathProgramCache]: Analyzing trace with hash -791645332, now seen corresponding path program 1 times [2021-11-23 17:21:47,078 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:47,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1473220033] [2021-11-23 17:21:47,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:47,078 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:47,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:47,080 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:47,112 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 17:21:47,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:47,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:21:47,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:50,776 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:50,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:53,389 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:53,389 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:53,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1473220033] [2021-11-23 17:21:53,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1473220033] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:53,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1989121702] [2021-11-23 17:21:53,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:53,390 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:53,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:21:53,403 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:21:53,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-23 17:21:53,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:53,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:21:53,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:56,252 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:56,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:57,090 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:57,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1989121702] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:57,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1640855788] [2021-11-23 17:21:57,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:57,091 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:57,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:21:57,092 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:21:57,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-23 17:21:57,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:57,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:21:57,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:00,983 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:00,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:02,382 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:02,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1640855788] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:02,383 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:02,383 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 22, 20, 18, 17] total 56 [2021-11-23 17:22:02,383 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646766279] [2021-11-23 17:22:02,383 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:02,384 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-23 17:22:02,384 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:02,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-23 17:22:02,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=2714, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 17:22:02,387 INFO L87 Difference]: Start difference. First operand 1863 states and 2805 transitions. Second operand has 56 states, 56 states have (on average 3.392857142857143) internal successors, (190), 56 states have internal predecessors, (190), 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 17:22:03,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:03,604 INFO L93 Difference]: Finished difference Result 2110 states and 3122 transitions. [2021-11-23 17:22:03,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:22:03,607 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.392857142857143) internal successors, (190), 56 states have internal predecessors, (190), 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 67 [2021-11-23 17:22:03,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:03,611 INFO L225 Difference]: With dead ends: 2110 [2021-11-23 17:22:03,611 INFO L226 Difference]: Without dead ends: 1992 [2021-11-23 17:22:03,613 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 344 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1297 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=446, Invalid=2976, Unknown=0, NotChecked=0, Total=3422 [2021-11-23 17:22:03,614 INFO L933 BasicCegarLoop]: 1520 mSDtfsCounter, 14548 mSDsluCounter, 24559 mSDsCounter, 0 mSdLazyCounter, 301 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14548 SdHoareTripleChecker+Valid, 26079 SdHoareTripleChecker+Invalid, 562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 301 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 240 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:03,615 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14548 Valid, 26079 Invalid, 562 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 301 Invalid, 0 Unknown, 240 Unchecked, 0.5s Time] [2021-11-23 17:22:03,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1992 states. [2021-11-23 17:22:03,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1992 to 1869. [2021-11-23 17:22:03,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1869 states, 1867 states have (on average 1.5061596143545795) internal successors, (2812), 1868 states have internal predecessors, (2812), 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 17:22:03,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1869 states to 1869 states and 2812 transitions. [2021-11-23 17:22:03,677 INFO L78 Accepts]: Start accepts. Automaton has 1869 states and 2812 transitions. Word has length 67 [2021-11-23 17:22:03,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:03,677 INFO L470 AbstractCegarLoop]: Abstraction has 1869 states and 2812 transitions. [2021-11-23 17:22:03,678 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 3.392857142857143) internal successors, (190), 56 states have internal predecessors, (190), 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 17:22:03,678 INFO L276 IsEmpty]: Start isEmpty. Operand 1869 states and 2812 transitions. [2021-11-23 17:22:03,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 17:22:03,679 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:03,679 INFO L514 BasicCegarLoop]: trace histogram [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 17:22:03,686 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:03,907 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:04,091 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Ended with exit code 0 [2021-11-23 17:22:04,282 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:04,282 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:04,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:04,283 INFO L85 PathProgramCache]: Analyzing trace with hash 138650479, now seen corresponding path program 1 times [2021-11-23 17:22:04,283 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:04,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1264585733] [2021-11-23 17:22:04,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:04,283 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:04,284 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:04,284 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:04,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-23 17:22:04,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:04,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:22:04,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:07,328 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:07,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:08,965 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:08,965 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:08,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1264585733] [2021-11-23 17:22:08,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1264585733] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:08,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1925057856] [2021-11-23 17:22:08,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:08,966 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:08,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:08,967 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:08,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-11-23 17:22:09,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:09,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:22:09,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:11,472 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:11,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:12,209 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:12,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1925057856] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:12,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [195621106] [2021-11-23 17:22:12,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:12,209 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:12,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:12,210 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:12,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-23 17:22:12,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:12,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:22:12,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:15,761 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:15,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:17,171 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:17,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [195621106] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:17,171 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:17,171 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 20, 18, 18, 18] total 55 [2021-11-23 17:22:17,172 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652598902] [2021-11-23 17:22:17,172 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:17,173 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 17:22:17,173 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:17,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 17:22:17,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=2600, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:22:17,176 INFO L87 Difference]: Start difference. First operand 1869 states and 2812 transitions. Second operand has 55 states, 55 states have (on average 3.4909090909090907) internal successors, (192), 55 states have internal predecessors, (192), 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 17:22:18,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:18,279 INFO L93 Difference]: Finished difference Result 2118 states and 3129 transitions. [2021-11-23 17:22:18,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 17:22:18,279 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.4909090909090907) internal successors, (192), 55 states have internal predecessors, (192), 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 67 [2021-11-23 17:22:18,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:18,284 INFO L225 Difference]: With dead ends: 2118 [2021-11-23 17:22:18,284 INFO L226 Difference]: Without dead ends: 1990 [2021-11-23 17:22:18,287 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 344 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1399 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=453, Invalid=2853, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 17:22:18,288 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 11673 mSDsluCounter, 27375 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11673 SdHoareTripleChecker+Valid, 28896 SdHoareTripleChecker+Invalid, 559 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 260 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:18,288 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11673 Valid, 28896 Invalid, 559 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 283 Invalid, 0 Unknown, 260 Unchecked, 0.5s Time] [2021-11-23 17:22:18,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1990 states. [2021-11-23 17:22:18,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1990 to 1855. [2021-11-23 17:22:18,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1855 states, 1853 states have (on average 1.5083648138154344) internal successors, (2795), 1854 states have internal predecessors, (2795), 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 17:22:18,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1855 states to 1855 states and 2795 transitions. [2021-11-23 17:22:18,353 INFO L78 Accepts]: Start accepts. Automaton has 1855 states and 2795 transitions. Word has length 67 [2021-11-23 17:22:18,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:18,353 INFO L470 AbstractCegarLoop]: Abstraction has 1855 states and 2795 transitions. [2021-11-23 17:22:18,353 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.4909090909090907) internal successors, (192), 55 states have internal predecessors, (192), 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 17:22:18,354 INFO L276 IsEmpty]: Start isEmpty. Operand 1855 states and 2795 transitions. [2021-11-23 17:22:18,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:22:18,355 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:18,355 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:22:18,407 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:18,611 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Ended with exit code 0 [2021-11-23 17:22:18,804 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (35)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:19,003 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:19,003 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:19,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:19,004 INFO L85 PathProgramCache]: Analyzing trace with hash -14785480, now seen corresponding path program 1 times [2021-11-23 17:22:19,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:19,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1282596170] [2021-11-23 17:22:19,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:19,004 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:19,004 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:19,005 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:19,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-23 17:22:19,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:19,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:22:19,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:19,389 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:22:19,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:19,635 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:22:19,635 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:19,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1282596170] [2021-11-23 17:22:19,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1282596170] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:19,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [618127314] [2021-11-23 17:22:19,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:19,636 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:19,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:19,637 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:19,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-23 17:22:19,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:19,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:22:19,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:20,178 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:22:20,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:20,458 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:22:20,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [618127314] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:20,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [346956137] [2021-11-23 17:22:20,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:20,459 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:20,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:20,460 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:20,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-23 17:22:20,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:20,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:22:20,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:20,889 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:22:20,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:21,124 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:22:21,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [346956137] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:21,124 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:21,124 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 6 [2021-11-23 17:22:21,125 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098051928] [2021-11-23 17:22:21,125 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:21,125 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:22:21,125 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:21,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:22:21,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:22:21,126 INFO L87 Difference]: Start difference. First operand 1855 states and 2795 transitions. Second operand has 6 states, 6 states have (on average 21.5) internal successors, (129), 6 states have internal predecessors, (129), 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 17:22:21,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:21,242 INFO L93 Difference]: Finished difference Result 2611 states and 3781 transitions. [2021-11-23 17:22:21,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:22:21,242 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.5) internal successors, (129), 6 states have internal predecessors, (129), 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 68 [2021-11-23 17:22:21,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:21,247 INFO L225 Difference]: With dead ends: 2611 [2021-11-23 17:22:21,247 INFO L226 Difference]: Without dead ends: 2329 [2021-11-23 17:22:21,249 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 395 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:22:21,250 INFO L933 BasicCegarLoop]: 1536 mSDtfsCounter, 1587 mSDsluCounter, 1687 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1587 SdHoareTripleChecker+Valid, 3223 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 16 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:21,250 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1587 Valid, 3223 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 22 Invalid, 0 Unknown, 16 Unchecked, 0.0s Time] [2021-11-23 17:22:21,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2329 states. [2021-11-23 17:22:21,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2329 to 2261. [2021-11-23 17:22:21,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2261 states, 2259 states have (on average 1.467020805666224) internal successors, (3314), 2260 states have internal predecessors, (3314), 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 17:22:21,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2261 states to 2261 states and 3314 transitions. [2021-11-23 17:22:21,349 INFO L78 Accepts]: Start accepts. Automaton has 2261 states and 3314 transitions. Word has length 68 [2021-11-23 17:22:21,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:21,350 INFO L470 AbstractCegarLoop]: Abstraction has 2261 states and 3314 transitions. [2021-11-23 17:22:21,350 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.5) internal successors, (129), 6 states have internal predecessors, (129), 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 17:22:21,350 INFO L276 IsEmpty]: Start isEmpty. Operand 2261 states and 3314 transitions. [2021-11-23 17:22:21,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:22:21,351 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:21,352 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:22:21,392 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:21,575 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Ended with exit code 0 [2021-11-23 17:22:21,767 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Ended with exit code 0 [2021-11-23 17:22:21,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:21,967 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:21,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:21,967 INFO L85 PathProgramCache]: Analyzing trace with hash -1574375839, now seen corresponding path program 1 times [2021-11-23 17:22:21,967 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:21,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2017460448] [2021-11-23 17:22:21,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:21,968 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:21,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:21,969 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:21,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-23 17:22:22,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:22,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:22:22,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:26,600 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:26,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:29,793 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:29,793 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:29,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2017460448] [2021-11-23 17:22:29,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2017460448] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:29,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1379628316] [2021-11-23 17:22:29,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:29,793 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:29,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:29,794 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:29,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-23 17:22:29,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:29,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:22:29,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:32,824 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:32,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:33,735 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:33,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1379628316] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:33,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [178387424] [2021-11-23 17:22:33,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:33,736 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:33,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:33,737 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:33,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-23 17:22:33,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:33,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:22:33,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:39,756 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:39,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:41,754 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:41,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [178387424] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:41,754 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:41,755 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18, 11, 9, 23, 20] total 68 [2021-11-23 17:22:41,755 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [168818244] [2021-11-23 17:22:41,755 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:41,756 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-23 17:22:41,756 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:41,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-23 17:22:41,758 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=555, Invalid=4001, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 17:22:41,758 INFO L87 Difference]: Start difference. First operand 2261 states and 3314 transitions. Second operand has 68 states, 68 states have (on average 3.8529411764705883) internal successors, (262), 68 states have internal predecessors, (262), 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 17:22:42,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:42,771 INFO L93 Difference]: Finished difference Result 2516 states and 3643 transitions. [2021-11-23 17:22:42,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:22:42,772 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 3.8529411764705883) internal successors, (262), 68 states have internal predecessors, (262), 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 68 [2021-11-23 17:22:42,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:42,776 INFO L225 Difference]: With dead ends: 2516 [2021-11-23 17:22:42,776 INFO L226 Difference]: Without dead ends: 2288 [2021-11-23 17:22:42,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 336 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2137 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=610, Invalid=4220, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 17:22:42,780 INFO L933 BasicCegarLoop]: 1494 mSDtfsCounter, 11676 mSDsluCounter, 21062 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11676 SdHoareTripleChecker+Valid, 22556 SdHoareTripleChecker+Invalid, 348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 118 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:42,781 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11676 Valid, 22556 Invalid, 348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 215 Invalid, 0 Unknown, 118 Unchecked, 0.4s Time] [2021-11-23 17:22:42,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2288 states. [2021-11-23 17:22:42,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2288 to 2267. [2021-11-23 17:22:42,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2267 states, 2265 states have (on average 1.466225165562914) internal successors, (3321), 2266 states have internal predecessors, (3321), 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 17:22:42,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2267 states to 2267 states and 3321 transitions. [2021-11-23 17:22:42,917 INFO L78 Accepts]: Start accepts. Automaton has 2267 states and 3321 transitions. Word has length 68 [2021-11-23 17:22:42,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:42,917 INFO L470 AbstractCegarLoop]: Abstraction has 2267 states and 3321 transitions. [2021-11-23 17:22:42,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 3.8529411764705883) internal successors, (262), 68 states have internal predecessors, (262), 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 17:22:42,918 INFO L276 IsEmpty]: Start isEmpty. Operand 2267 states and 3321 transitions. [2021-11-23 17:22:42,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:22:42,919 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:42,919 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:22:42,939 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:43,136 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (41)] Ended with exit code 0 [2021-11-23 17:22:43,356 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2021-11-23 17:22:43,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:43,535 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:43,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:43,535 INFO L85 PathProgramCache]: Analyzing trace with hash 1310661252, now seen corresponding path program 1 times [2021-11-23 17:22:43,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:43,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [320331521] [2021-11-23 17:22:43,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:43,536 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:43,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:43,537 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:43,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-23 17:22:43,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:43,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:22:43,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:47,252 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:47,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:49,891 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:49,891 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:49,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [320331521] [2021-11-23 17:22:49,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [320331521] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:49,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [640369410] [2021-11-23 17:22:49,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:49,892 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:49,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:49,894 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:49,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-23 17:22:50,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:50,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:22:50,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:54,662 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:54,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:57,510 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:57,510 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [640369410] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:57,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [213339618] [2021-11-23 17:22:57,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:57,511 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:57,511 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:57,512 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:57,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-23 17:22:57,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:57,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:22:57,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:01,322 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:01,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:02,868 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:02,868 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [213339618] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:02,868 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:02,869 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 22, 20, 16, 15] total 87 [2021-11-23 17:23:02,869 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912969129] [2021-11-23 17:23:02,869 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:02,869 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-23 17:23:02,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:02,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-23 17:23:02,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=848, Invalid=6634, Unknown=0, NotChecked=0, Total=7482 [2021-11-23 17:23:02,873 INFO L87 Difference]: Start difference. First operand 2267 states and 3321 transitions. Second operand has 87 states, 87 states have (on average 3.3448275862068964) internal successors, (291), 87 states have internal predecessors, (291), 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 17:23:04,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:04,892 INFO L93 Difference]: Finished difference Result 3071 states and 4332 transitions. [2021-11-23 17:23:04,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 17:23:04,892 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 3.3448275862068964) internal successors, (291), 87 states have internal predecessors, (291), 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 68 [2021-11-23 17:23:04,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:04,898 INFO L225 Difference]: With dead ends: 3071 [2021-11-23 17:23:04,898 INFO L226 Difference]: Without dead ends: 2380 [2021-11-23 17:23:04,903 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 410 GetRequests, 321 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4121 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=971, Invalid=7219, Unknown=0, NotChecked=0, Total=8190 [2021-11-23 17:23:04,904 INFO L933 BasicCegarLoop]: 1528 mSDtfsCounter, 7522 mSDsluCounter, 36250 mSDsCounter, 0 mSdLazyCounter, 556 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7522 SdHoareTripleChecker+Valid, 37778 SdHoareTripleChecker+Invalid, 938 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 556 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 360 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:04,905 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7522 Valid, 37778 Invalid, 938 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [22 Valid, 556 Invalid, 0 Unknown, 360 Unchecked, 0.9s Time] [2021-11-23 17:23:04,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2380 states. [2021-11-23 17:23:04,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2380 to 2137. [2021-11-23 17:23:04,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2137 states, 2135 states have (on average 1.4744730679156908) internal successors, (3148), 2136 states have internal predecessors, (3148), 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 17:23:04,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2137 states to 2137 states and 3148 transitions. [2021-11-23 17:23:04,993 INFO L78 Accepts]: Start accepts. Automaton has 2137 states and 3148 transitions. Word has length 68 [2021-11-23 17:23:04,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:04,994 INFO L470 AbstractCegarLoop]: Abstraction has 2137 states and 3148 transitions. [2021-11-23 17:23:04,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 3.3448275862068964) internal successors, (291), 87 states have internal predecessors, (291), 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 17:23:04,994 INFO L276 IsEmpty]: Start isEmpty. Operand 2137 states and 3148 transitions. [2021-11-23 17:23:04,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 17:23:04,995 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:04,997 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:23:05,018 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:05,213 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (44)] Ended with exit code 0 [2021-11-23 17:23:05,437 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2021-11-23 17:23:05,612 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:05,613 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:05,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:05,613 INFO L85 PathProgramCache]: Analyzing trace with hash 1846619806, now seen corresponding path program 1 times [2021-11-23 17:23:05,613 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:05,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1751826492] [2021-11-23 17:23:05,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:05,614 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:05,614 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:05,615 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:05,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-23 17:23:05,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:05,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:23:05,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:06,042 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:23:06,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:06,293 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:23:06,293 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:06,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1751826492] [2021-11-23 17:23:06,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1751826492] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:06,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1679114757] [2021-11-23 17:23:06,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:06,293 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:06,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:06,294 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:06,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (47)] Waiting until timeout for monitored process [2021-11-23 17:23:06,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:06,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:23:06,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:06,488 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:23:06,488 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:23:06,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1679114757] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:23:06,488 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:23:06,488 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 17:23:06,488 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897811404] [2021-11-23 17:23:06,489 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:23:06,489 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:23:06,489 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:06,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:23:06,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:23:06,490 INFO L87 Difference]: Start difference. First operand 2137 states and 3148 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 17:23:06,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:06,568 INFO L93 Difference]: Finished difference Result 2660 states and 3822 transitions. [2021-11-23 17:23:06,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:23:06,569 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 69 [2021-11-23 17:23:06,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:06,571 INFO L225 Difference]: With dead ends: 2660 [2021-11-23 17:23:06,571 INFO L226 Difference]: Without dead ends: 2158 [2021-11-23 17:23:06,573 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 199 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:23:06,573 INFO L933 BasicCegarLoop]: 1515 mSDtfsCounter, 1484 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1484 SdHoareTripleChecker+Valid, 1564 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:06,574 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1484 Valid, 1564 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:23:06,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2158 states. [2021-11-23 17:23:06,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2158 to 2107. [2021-11-23 17:23:06,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2107 states, 2105 states have (on average 1.4764845605700712) internal successors, (3108), 2106 states have internal predecessors, (3108), 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 17:23:06,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2107 states to 2107 states and 3108 transitions. [2021-11-23 17:23:06,659 INFO L78 Accepts]: Start accepts. Automaton has 2107 states and 3108 transitions. Word has length 69 [2021-11-23 17:23:06,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:06,660 INFO L470 AbstractCegarLoop]: Abstraction has 2107 states and 3108 transitions. [2021-11-23 17:23:06,660 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 17:23:06,660 INFO L276 IsEmpty]: Start isEmpty. Operand 2107 states and 3108 transitions. [2021-11-23 17:23:06,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 17:23:06,661 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:06,662 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:23:06,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:06,882 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (47)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:07,076 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:07,077 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:07,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:07,077 INFO L85 PathProgramCache]: Analyzing trace with hash 1362739138, now seen corresponding path program 1 times [2021-11-23 17:23:07,077 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:07,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [730591388] [2021-11-23 17:23:07,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:07,078 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:07,078 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:07,079 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:07,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 17:23:07,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:07,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:23:07,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:08,961 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:08,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:09,428 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:09,429 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:09,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [730591388] [2021-11-23 17:23:09,429 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [730591388] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:09,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1995575064] [2021-11-23 17:23:09,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:09,429 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:09,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:09,430 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:09,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2021-11-23 17:23:09,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:09,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:23:09,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:11,130 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:11,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:11,404 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:11,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1995575064] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:11,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1150727503] [2021-11-23 17:23:11,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:11,405 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:11,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:11,406 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:11,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-23 17:23:11,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:11,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:23:11,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:13,012 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:13,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:13,275 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:13,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1150727503] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:13,276 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:13,277 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 10, 9] total 18 [2021-11-23 17:23:13,277 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019181629] [2021-11-23 17:23:13,277 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:13,278 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:23:13,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:13,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:23:13,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:23:13,280 INFO L87 Difference]: Start difference. First operand 2107 states and 3108 transitions. Second operand has 18 states, 18 states have (on average 6.833333333333333) internal successors, (123), 18 states have internal predecessors, (123), 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 17:23:13,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:13,490 INFO L93 Difference]: Finished difference Result 2278 states and 3332 transitions. [2021-11-23 17:23:13,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:23:13,490 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 6.833333333333333) internal successors, (123), 18 states have internal predecessors, (123), 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 69 [2021-11-23 17:23:13,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:13,494 INFO L225 Difference]: With dead ends: 2278 [2021-11-23 17:23:13,494 INFO L226 Difference]: Without dead ends: 2055 [2021-11-23 17:23:13,495 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 392 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:23:13,496 INFO L933 BasicCegarLoop]: 1507 mSDtfsCounter, 1465 mSDsluCounter, 10635 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1465 SdHoareTripleChecker+Valid, 12142 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:13,497 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1465 Valid, 12142 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 52 Invalid, 0 Unknown, 47 Unchecked, 0.1s Time] [2021-11-23 17:23:13,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2055 states. [2021-11-23 17:23:13,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2055 to 2049. [2021-11-23 17:23:13,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2049 states, 2047 states have (on average 1.4807034684904739) internal successors, (3031), 2048 states have internal predecessors, (3031), 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 17:23:13,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2049 states to 2049 states and 3031 transitions. [2021-11-23 17:23:13,575 INFO L78 Accepts]: Start accepts. Automaton has 2049 states and 3031 transitions. Word has length 69 [2021-11-23 17:23:13,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:13,576 INFO L470 AbstractCegarLoop]: Abstraction has 2049 states and 3031 transitions. [2021-11-23 17:23:13,576 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 6.833333333333333) internal successors, (123), 18 states have internal predecessors, (123), 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 17:23:13,576 INFO L276 IsEmpty]: Start isEmpty. Operand 2049 states and 3031 transitions. [2021-11-23 17:23:13,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:23:13,578 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:13,579 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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] [2021-11-23 17:23:13,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:13,791 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:14,007 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:14,182 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:14,182 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:14,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:14,183 INFO L85 PathProgramCache]: Analyzing trace with hash 1940957519, now seen corresponding path program 1 times [2021-11-23 17:23:14,183 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:14,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1768053377] [2021-11-23 17:23:14,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:14,183 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:14,183 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:14,184 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:14,185 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-23 17:23:14,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:14,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:23:14,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:16,936 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:16,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:17,907 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:17,908 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:17,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1768053377] [2021-11-23 17:23:17,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1768053377] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:17,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [725597045] [2021-11-23 17:23:17,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:17,908 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:17,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:17,909 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:17,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2021-11-23 17:23:18,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:18,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:23:18,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:20,286 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:20,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:20,833 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:20,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [725597045] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:20,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783217126] [2021-11-23 17:23:20,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:20,833 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:20,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:20,837 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:20,837 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-23 17:23:20,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:20,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:23:20,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:22,816 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:23:22,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:23,844 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:23:23,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1783217126] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:23,845 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:23,845 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:23:23,845 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294766674] [2021-11-23 17:23:23,846 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:23,846 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:23:23,846 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:23,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:23:23,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:23:23,848 INFO L87 Difference]: Start difference. First operand 2049 states and 3031 transitions. Second operand has 34 states, 34 states have (on average 9.970588235294118) internal successors, (339), 33 states have internal predecessors, (339), 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 17:23:24,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:24,771 INFO L93 Difference]: Finished difference Result 2498 states and 3606 transitions. [2021-11-23 17:23:24,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:23:24,771 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 9.970588235294118) internal successors, (339), 33 states have internal predecessors, (339), 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 111 [2021-11-23 17:23:24,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:24,774 INFO L225 Difference]: With dead ends: 2498 [2021-11-23 17:23:24,774 INFO L226 Difference]: Without dead ends: 2083 [2021-11-23 17:23:24,775 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 673 GetRequests, 631 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=256, Invalid=1636, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:23:24,776 INFO L933 BasicCegarLoop]: 1514 mSDtfsCounter, 13117 mSDsluCounter, 22686 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13117 SdHoareTripleChecker+Valid, 24200 SdHoareTripleChecker+Invalid, 178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 117 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:24,777 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13117 Valid, 24200 Invalid, 178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 54 Invalid, 0 Unknown, 117 Unchecked, 0.1s Time] [2021-11-23 17:23:24,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2083 states. [2021-11-23 17:23:24,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2083 to 2083. [2021-11-23 17:23:24,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2083 states, 2081 states have (on average 1.474291206150889) internal successors, (3068), 2082 states have internal predecessors, (3068), 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 17:23:24,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2083 states to 2083 states and 3068 transitions. [2021-11-23 17:23:24,862 INFO L78 Accepts]: Start accepts. Automaton has 2083 states and 3068 transitions. Word has length 111 [2021-11-23 17:23:24,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:24,863 INFO L470 AbstractCegarLoop]: Abstraction has 2083 states and 3068 transitions. [2021-11-23 17:23:24,863 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 9.970588235294118) internal successors, (339), 33 states have internal predecessors, (339), 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 17:23:24,863 INFO L276 IsEmpty]: Start isEmpty. Operand 2083 states and 3068 transitions. [2021-11-23 17:23:24,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:23:24,865 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:24,865 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 17:23:24,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:25,080 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Ended with exit code 0 [2021-11-23 17:23:25,304 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:25,478 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:25,479 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:25,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:25,479 INFO L85 PathProgramCache]: Analyzing trace with hash -721276639, now seen corresponding path program 1 times [2021-11-23 17:23:25,480 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:25,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1457028114] [2021-11-23 17:23:25,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:25,480 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:25,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:25,482 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:25,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-23 17:23:25,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:25,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:23:25,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:28,318 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:28,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:29,366 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:29,366 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:29,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1457028114] [2021-11-23 17:23:29,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1457028114] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:29,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2125999294] [2021-11-23 17:23:29,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:29,367 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:29,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:29,368 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:29,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-11-23 17:23:29,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:29,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:23:29,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:31,764 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:31,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:32,527 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:32,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2125999294] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:32,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1447309189] [2021-11-23 17:23:32,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:32,528 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:32,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:32,531 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:32,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-23 17:23:32,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:32,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:23:32,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:35,061 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 65 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:23:35,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:35,850 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 65 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:23:35,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1447309189] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:35,851 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:35,851 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:23:35,851 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772407963] [2021-11-23 17:23:35,851 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:35,852 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:23:35,853 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:35,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:23:35,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:23:35,854 INFO L87 Difference]: Start difference. First operand 2083 states and 3068 transitions. Second operand has 34 states, 34 states have (on average 10.264705882352942) internal successors, (349), 33 states have internal predecessors, (349), 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 17:23:36,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:36,705 INFO L93 Difference]: Finished difference Result 2580 states and 3697 transitions. [2021-11-23 17:23:36,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:23:36,705 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 10.264705882352942) internal successors, (349), 33 states have internal predecessors, (349), 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 111 [2021-11-23 17:23:36,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:36,708 INFO L225 Difference]: With dead ends: 2580 [2021-11-23 17:23:36,708 INFO L226 Difference]: Without dead ends: 2171 [2021-11-23 17:23:36,710 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 672 GetRequests, 630 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=245, Invalid=1647, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:23:36,711 INFO L933 BasicCegarLoop]: 1519 mSDtfsCounter, 5943 mSDsluCounter, 28721 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5943 SdHoareTripleChecker+Valid, 30240 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 125 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:36,711 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5943 Valid, 30240 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 44 Invalid, 0 Unknown, 125 Unchecked, 0.1s Time] [2021-11-23 17:23:36,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2171 states. [2021-11-23 17:23:36,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2171 to 2167. [2021-11-23 17:23:36,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2167 states, 2165 states have (on average 1.4605080831408777) internal successors, (3162), 2166 states have internal predecessors, (3162), 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 17:23:36,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2167 states to 2167 states and 3162 transitions. [2021-11-23 17:23:36,825 INFO L78 Accepts]: Start accepts. Automaton has 2167 states and 3162 transitions. Word has length 111 [2021-11-23 17:23:36,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:36,825 INFO L470 AbstractCegarLoop]: Abstraction has 2167 states and 3162 transitions. [2021-11-23 17:23:36,826 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 10.264705882352942) internal successors, (349), 33 states have internal predecessors, (349), 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 17:23:36,826 INFO L276 IsEmpty]: Start isEmpty. Operand 2167 states and 3162 transitions. [2021-11-23 17:23:36,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:23:36,828 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:36,828 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 17:23:36,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:37,039 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Ended with exit code 0 [2021-11-23 17:23:37,252 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2021-11-23 17:23:37,431 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:37,431 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:37,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:37,431 INFO L85 PathProgramCache]: Analyzing trace with hash 1804907841, now seen corresponding path program 1 times [2021-11-23 17:23:37,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:37,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1155053492] [2021-11-23 17:23:37,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:37,432 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:37,432 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:37,433 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:37,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 17:23:37,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:37,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:23:37,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:40,635 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:40,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:41,531 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:41,531 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:41,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1155053492] [2021-11-23 17:23:41,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1155053492] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:41,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1901163964] [2021-11-23 17:23:41,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:41,532 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:41,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:41,533 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:41,534 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2021-11-23 17:23:41,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:41,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:23:41,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:44,337 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:44,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:44,824 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:44,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1901163964] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:44,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [676031427] [2021-11-23 17:23:44,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:44,826 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:44,826 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:44,837 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:44,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-23 17:23:44,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:44,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:23:44,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:47,104 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 72 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:23:47,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:48,068 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 72 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:23:48,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [676031427] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:48,068 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:48,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:23:48,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435728715] [2021-11-23 17:23:48,069 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:48,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:23:48,070 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:48,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:23:48,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:23:48,071 INFO L87 Difference]: Start difference. First operand 2167 states and 3162 transitions. Second operand has 34 states, 34 states have (on average 10.705882352941176) internal successors, (364), 33 states have internal predecessors, (364), 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 17:23:49,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:49,011 INFO L93 Difference]: Finished difference Result 2733 states and 3869 transitions. [2021-11-23 17:23:49,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:23:49,011 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 10.705882352941176) internal successors, (364), 33 states have internal predecessors, (364), 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 111 [2021-11-23 17:23:49,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:49,013 INFO L225 Difference]: With dead ends: 2733 [2021-11-23 17:23:49,013 INFO L226 Difference]: Without dead ends: 2336 [2021-11-23 17:23:49,014 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 673 GetRequests, 631 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=258, Invalid=1634, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:23:49,015 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 11733 mSDsluCounter, 24427 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11733 SdHoareTripleChecker+Valid, 25948 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 182 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:49,015 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11733 Valid, 25948 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 59 Invalid, 0 Unknown, 182 Unchecked, 0.1s Time] [2021-11-23 17:23:49,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2336 states. [2021-11-23 17:23:49,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2336 to 2336. [2021-11-23 17:23:49,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2336 states, 2334 states have (on average 1.437446443873179) internal successors, (3355), 2335 states have internal predecessors, (3355), 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 17:23:49,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2336 states to 2336 states and 3355 transitions. [2021-11-23 17:23:49,083 INFO L78 Accepts]: Start accepts. Automaton has 2336 states and 3355 transitions. Word has length 111 [2021-11-23 17:23:49,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:49,083 INFO L470 AbstractCegarLoop]: Abstraction has 2336 states and 3355 transitions. [2021-11-23 17:23:49,083 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 10.705882352941176) internal successors, (364), 33 states have internal predecessors, (364), 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 17:23:49,083 INFO L276 IsEmpty]: Start isEmpty. Operand 2336 states and 3355 transitions. [2021-11-23 17:23:49,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:23:49,085 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:49,085 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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] [2021-11-23 17:23:49,109 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2021-11-23 17:23:49,292 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:49,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:49,690 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:23:49,691 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:49,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:49,691 INFO L85 PathProgramCache]: Analyzing trace with hash 1868570961, now seen corresponding path program 1 times [2021-11-23 17:23:49,692 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:49,692 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1487462048] [2021-11-23 17:23:49,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:49,692 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:49,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:49,693 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:49,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-23 17:23:49,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:49,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:23:49,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:51,933 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 58 proven. 32 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:23:51,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:52,911 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 58 proven. 32 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:23:52,912 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:52,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1487462048] [2021-11-23 17:23:52,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1487462048] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:52,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1902486280] [2021-11-23 17:23:52,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:52,912 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:52,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:52,913 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:52,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2021-11-23 17:23:53,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:53,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:23:53,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:56,675 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:56,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:57,909 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:57,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1902486280] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:57,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1865077876] [2021-11-23 17:23:57,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:57,911 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:57,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:57,915 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:57,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-23 17:23:58,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:58,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:23:58,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:00,620 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 64 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:24:00,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:01,496 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 64 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:24:01,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1865077876] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:01,497 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:01,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:24:01,497 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487549072] [2021-11-23 17:24:01,498 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:01,499 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:24:01,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:01,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:24:01,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:24:01,501 INFO L87 Difference]: Start difference. First operand 2336 states and 3355 transitions. Second operand has 48 states, 48 states have (on average 10.395833333333334) internal successors, (499), 47 states have internal predecessors, (499), 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 17:24:03,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:03,826 INFO L93 Difference]: Finished difference Result 2898 states and 4071 transitions. [2021-11-23 17:24:03,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 17:24:03,826 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 10.395833333333334) internal successors, (499), 47 states have internal predecessors, (499), 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 111 [2021-11-23 17:24:03,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:03,829 INFO L225 Difference]: With dead ends: 2898 [2021-11-23 17:24:03,829 INFO L226 Difference]: Without dead ends: 2446 [2021-11-23 17:24:03,831 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 688 GetRequests, 621 SyntacticMatches, 3 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1079 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=415, Invalid=3875, Unknown=0, NotChecked=0, Total=4290 [2021-11-23 17:24:03,832 INFO L933 BasicCegarLoop]: 1518 mSDtfsCounter, 8864 mSDsluCounter, 39198 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8864 SdHoareTripleChecker+Valid, 40716 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 149 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:03,832 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8864 Valid, 40716 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 58 Invalid, 0 Unknown, 149 Unchecked, 0.1s Time] [2021-11-23 17:24:03,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2446 states. [2021-11-23 17:24:03,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2446 to 2442. [2021-11-23 17:24:03,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2442 states, 2440 states have (on average 1.4258196721311476) internal successors, (3479), 2441 states have internal predecessors, (3479), 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 17:24:03,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2442 states to 2442 states and 3479 transitions. [2021-11-23 17:24:03,908 INFO L78 Accepts]: Start accepts. Automaton has 2442 states and 3479 transitions. Word has length 111 [2021-11-23 17:24:03,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:03,909 INFO L470 AbstractCegarLoop]: Abstraction has 2442 states and 3479 transitions. [2021-11-23 17:24:03,909 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 10.395833333333334) internal successors, (499), 47 states have internal predecessors, (499), 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 17:24:03,909 INFO L276 IsEmpty]: Start isEmpty. Operand 2442 states and 3479 transitions. [2021-11-23 17:24:03,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:24:03,911 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:03,911 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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] [2021-11-23 17:24:03,916 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:04,125 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:04,335 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2021-11-23 17:24:04,512 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:04,512 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:04,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:04,512 INFO L85 PathProgramCache]: Analyzing trace with hash -1694478255, now seen corresponding path program 1 times [2021-11-23 17:24:04,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:04,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [422793075] [2021-11-23 17:24:04,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:04,513 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:04,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:04,514 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:04,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2021-11-23 17:24:04,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:04,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:24:04,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:06,728 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 62 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:24:06,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:07,471 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 62 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:24:07,471 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:07,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [422793075] [2021-11-23 17:24:07,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [422793075] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:07,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1035284430] [2021-11-23 17:24:07,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:07,472 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:07,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:07,474 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:07,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Waiting until timeout for monitored process [2021-11-23 17:24:07,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:07,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:24:07,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:11,381 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:11,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:12,511 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:12,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1035284430] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:12,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [933398409] [2021-11-23 17:24:12,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:12,513 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:12,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:12,522 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:12,529 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-23 17:24:12,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:12,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:24:12,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:14,863 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:24:14,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:15,954 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:24:15,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [933398409] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:15,955 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:15,955 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:24:15,955 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930687435] [2021-11-23 17:24:15,955 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:15,956 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:24:15,956 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:15,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:24:15,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:24:15,958 INFO L87 Difference]: Start difference. First operand 2442 states and 3479 transitions. Second operand has 48 states, 48 states have (on average 10.25) internal successors, (492), 47 states have internal predecessors, (492), 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 17:24:18,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:18,044 INFO L93 Difference]: Finished difference Result 3081 states and 4284 transitions. [2021-11-23 17:24:18,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:24:18,044 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 10.25) internal successors, (492), 47 states have internal predecessors, (492), 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 111 [2021-11-23 17:24:18,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:18,046 INFO L225 Difference]: With dead ends: 3081 [2021-11-23 17:24:18,047 INFO L226 Difference]: Without dead ends: 2625 [2021-11-23 17:24:18,049 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 686 GetRequests, 620 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=390, Invalid=3770, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 17:24:18,049 INFO L933 BasicCegarLoop]: 1519 mSDtfsCounter, 8780 mSDsluCounter, 40866 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8780 SdHoareTripleChecker+Valid, 42385 SdHoareTripleChecker+Invalid, 471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 358 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:18,049 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8780 Valid, 42385 Invalid, 471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 108 Invalid, 0 Unknown, 358 Unchecked, 0.1s Time] [2021-11-23 17:24:18,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2625 states. [2021-11-23 17:24:18,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2625 to 2594. [2021-11-23 17:24:18,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2594 states, 2592 states have (on average 1.4116512345679013) internal successors, (3659), 2593 states have internal predecessors, (3659), 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 17:24:18,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2594 states to 2594 states and 3659 transitions. [2021-11-23 17:24:18,124 INFO L78 Accepts]: Start accepts. Automaton has 2594 states and 3659 transitions. Word has length 111 [2021-11-23 17:24:18,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:18,125 INFO L470 AbstractCegarLoop]: Abstraction has 2594 states and 3659 transitions. [2021-11-23 17:24:18,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 10.25) internal successors, (492), 47 states have internal predecessors, (492), 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 17:24:18,125 INFO L276 IsEmpty]: Start isEmpty. Operand 2594 states and 3659 transitions. [2021-11-23 17:24:18,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:24:18,126 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:18,126 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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] [2021-11-23 17:24:18,148 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:18,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:18,540 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Ended with exit code 0 [2021-11-23 17:24:18,730 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:24:18,730 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:18,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:18,731 INFO L85 PathProgramCache]: Analyzing trace with hash -1930363055, now seen corresponding path program 1 times [2021-11-23 17:24:18,731 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:18,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [640895140] [2021-11-23 17:24:18,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:18,732 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:18,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:18,733 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:18,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Waiting until timeout for monitored process [2021-11-23 17:24:18,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:18,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:24:18,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:20,580 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 66 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:24:20,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:21,487 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 66 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:24:21,487 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:21,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [640895140] [2021-11-23 17:24:21,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [640895140] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:21,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [478610599] [2021-11-23 17:24:21,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:21,488 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:21,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:21,489 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:21,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Waiting until timeout for monitored process [2021-11-23 17:24:21,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:21,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:24:21,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:23,864 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:23,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:24,736 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:24,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [478610599] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:24,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231438236] [2021-11-23 17:24:24,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:24,737 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:24,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:24,738 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:24,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-23 17:24:24,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:24,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:24:24,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:26,694 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:24:26,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:27,750 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:24:27,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231438236] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:27,751 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:27,751 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 17:24:27,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800886351] [2021-11-23 17:24:27,751 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:27,752 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 17:24:27,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:27,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 17:24:27,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 17:24:27,753 INFO L87 Difference]: Start difference. First operand 2594 states and 3659 transitions. Second operand has 39 states, 39 states have (on average 11.0) internal successors, (429), 38 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 17:24:29,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:29,315 INFO L93 Difference]: Finished difference Result 3122 states and 4335 transitions. [2021-11-23 17:24:29,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:24:29,315 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 11.0) internal successors, (429), 38 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 111 [2021-11-23 17:24:29,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:29,318 INFO L225 Difference]: With dead ends: 3122 [2021-11-23 17:24:29,318 INFO L226 Difference]: Without dead ends: 2662 [2021-11-23 17:24:29,320 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 627 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=355, Invalid=2615, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:24:29,320 INFO L933 BasicCegarLoop]: 1505 mSDtfsCounter, 7345 mSDsluCounter, 33021 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7345 SdHoareTripleChecker+Valid, 34526 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 205 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:29,320 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7345 Valid, 34526 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 55 Invalid, 0 Unknown, 205 Unchecked, 0.1s Time] [2021-11-23 17:24:29,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2662 states. [2021-11-23 17:24:29,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2662 to 2653. [2021-11-23 17:24:29,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2653 states, 2651 states have (on average 1.4043757072802716) internal successors, (3723), 2652 states have internal predecessors, (3723), 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 17:24:29,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2653 states to 2653 states and 3723 transitions. [2021-11-23 17:24:29,435 INFO L78 Accepts]: Start accepts. Automaton has 2653 states and 3723 transitions. Word has length 111 [2021-11-23 17:24:29,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:29,435 INFO L470 AbstractCegarLoop]: Abstraction has 2653 states and 3723 transitions. [2021-11-23 17:24:29,435 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 11.0) internal successors, (429), 38 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 17:24:29,435 INFO L276 IsEmpty]: Start isEmpty. Operand 2653 states and 3723 transitions. [2021-11-23 17:24:29,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:24:29,438 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:29,438 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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] [2021-11-23 17:24:29,466 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Ended with exit code 0 [2021-11-23 17:24:29,676 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:29,854 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Ended with exit code 0 [2021-11-23 17:24:30,053 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:30,053 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:30,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:30,054 INFO L85 PathProgramCache]: Analyzing trace with hash 1699429479, now seen corresponding path program 1 times [2021-11-23 17:24:30,054 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:30,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1284948005] [2021-11-23 17:24:30,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:30,054 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:30,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:30,055 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:30,056 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2021-11-23 17:24:30,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:30,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:24:30,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:37,124 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:37,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:40,065 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:40,066 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:40,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1284948005] [2021-11-23 17:24:40,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1284948005] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:40,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1778468963] [2021-11-23 17:24:40,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:40,067 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:40,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:40,067 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:40,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Waiting until timeout for monitored process [2021-11-23 17:24:40,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:40,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-23 17:24:40,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:46,152 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 61 proven. 6 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:24:46,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:50,034 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:50,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1778468963] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:50,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1227058295] [2021-11-23 17:24:50,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:50,035 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:50,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:50,036 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:50,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-23 17:24:50,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:50,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:24:50,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:58,083 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:58,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:01,061 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:01,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1227058295] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:01,061 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:01,061 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20, 22, 24, 18, 17] total 100 [2021-11-23 17:25:01,062 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904248607] [2021-11-23 17:25:01,062 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:01,062 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2021-11-23 17:25:01,063 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:01,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-11-23 17:25:01,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=930, Invalid=8970, Unknown=0, NotChecked=0, Total=9900 [2021-11-23 17:25:01,064 INFO L87 Difference]: Start difference. First operand 2653 states and 3723 transitions. Second operand has 100 states, 100 states have (on average 5.2) internal successors, (520), 100 states have internal predecessors, (520), 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 17:25:05,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:05,135 INFO L93 Difference]: Finished difference Result 3303 states and 4520 transitions. [2021-11-23 17:25:05,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 17:25:05,136 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 5.2) internal successors, (520), 100 states have internal predecessors, (520), 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 112 [2021-11-23 17:25:05,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:05,138 INFO L225 Difference]: With dead ends: 3303 [2021-11-23 17:25:05,138 INFO L226 Difference]: Without dead ends: 2642 [2021-11-23 17:25:05,140 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 695 GetRequests, 579 SyntacticMatches, 1 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4931 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=1359, Invalid=12213, Unknown=0, NotChecked=0, Total=13572 [2021-11-23 17:25:05,141 INFO L933 BasicCegarLoop]: 1497 mSDtfsCounter, 21846 mSDsluCounter, 39115 mSDsCounter, 0 mSdLazyCounter, 377 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21846 SdHoareTripleChecker+Valid, 40612 SdHoareTripleChecker+Invalid, 558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 377 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 150 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:05,142 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21846 Valid, 40612 Invalid, 558 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [31 Valid, 377 Invalid, 0 Unknown, 150 Unchecked, 0.6s Time] [2021-11-23 17:25:05,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2642 states. [2021-11-23 17:25:05,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2642 to 2573. [2021-11-23 17:25:05,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2573 states, 2571 states have (on average 1.413846752236484) internal successors, (3635), 2572 states have internal predecessors, (3635), 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 17:25:05,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2573 states to 2573 states and 3635 transitions. [2021-11-23 17:25:05,222 INFO L78 Accepts]: Start accepts. Automaton has 2573 states and 3635 transitions. Word has length 112 [2021-11-23 17:25:05,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:05,223 INFO L470 AbstractCegarLoop]: Abstraction has 2573 states and 3635 transitions. [2021-11-23 17:25:05,223 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 100 states have (on average 5.2) internal successors, (520), 100 states have internal predecessors, (520), 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 17:25:05,223 INFO L276 IsEmpty]: Start isEmpty. Operand 2573 states and 3635 transitions. [2021-11-23 17:25:05,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:25:05,224 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:05,224 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 17:25:05,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:05,435 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:05,650 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:05,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:05,827 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:05,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:05,828 INFO L85 PathProgramCache]: Analyzing trace with hash -510823495, now seen corresponding path program 1 times [2021-11-23 17:25:05,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:05,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [644929119] [2021-11-23 17:25:05,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:05,829 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:05,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:05,829 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:05,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Waiting until timeout for monitored process [2021-11-23 17:25:05,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:05,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:25:05,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:07,299 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:25:07,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:08,115 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:25:08,115 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:08,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [644929119] [2021-11-23 17:25:08,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [644929119] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:08,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [715585854] [2021-11-23 17:25:08,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:08,116 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:08,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:08,117 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:08,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Waiting until timeout for monitored process [2021-11-23 17:25:08,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:08,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:25:08,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:09,568 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:25:09,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:10,209 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:25:10,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [715585854] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:10,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [158273690] [2021-11-23 17:25:10,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:10,210 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:10,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:10,211 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:10,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2021-11-23 17:25:10,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:10,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:25:10,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:11,534 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:25:11,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:12,177 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:25:12,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [158273690] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:12,178 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:12,178 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:25:12,178 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445181448] [2021-11-23 17:25:12,178 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:12,179 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:25:12,179 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:12,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:25:12,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:25:12,180 INFO L87 Difference]: Start difference. First operand 2573 states and 3635 transitions. Second operand has 16 states, 16 states have (on average 10.0625) internal successors, (161), 15 states have internal predecessors, (161), 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 17:25:12,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:12,694 INFO L93 Difference]: Finished difference Result 3482 states and 4799 transitions. [2021-11-23 17:25:12,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:25:12,695 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.0625) internal successors, (161), 15 states have internal predecessors, (161), 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 112 [2021-11-23 17:25:12,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:12,697 INFO L225 Difference]: With dead ends: 3482 [2021-11-23 17:25:12,697 INFO L226 Difference]: Without dead ends: 3049 [2021-11-23 17:25:12,698 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 675 GetRequests, 653 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=119, Invalid=433, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:25:12,698 INFO L933 BasicCegarLoop]: 1515 mSDtfsCounter, 7297 mSDsluCounter, 9249 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7297 SdHoareTripleChecker+Valid, 10764 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 56 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:12,699 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7297 Valid, 10764 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 23 Invalid, 0 Unknown, 56 Unchecked, 0.0s Time] [2021-11-23 17:25:12,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3049 states. [2021-11-23 17:25:12,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3049 to 3027. [2021-11-23 17:25:12,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3027 states, 3025 states have (on average 1.3930578512396694) internal successors, (4214), 3026 states have internal predecessors, (4214), 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 17:25:12,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3027 states to 3027 states and 4214 transitions. [2021-11-23 17:25:12,798 INFO L78 Accepts]: Start accepts. Automaton has 3027 states and 4214 transitions. Word has length 112 [2021-11-23 17:25:12,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:12,799 INFO L470 AbstractCegarLoop]: Abstraction has 3027 states and 4214 transitions. [2021-11-23 17:25:12,799 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.0625) internal successors, (161), 15 states have internal predecessors, (161), 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 17:25:12,799 INFO L276 IsEmpty]: Start isEmpty. Operand 3027 states and 4214 transitions. [2021-11-23 17:25:12,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:25:12,801 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:12,801 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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] [2021-11-23 17:25:12,806 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:13,014 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:13,227 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Ended with exit code 0 [2021-11-23 17:25:13,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:13,405 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:13,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:13,406 INFO L85 PathProgramCache]: Analyzing trace with hash -1336782839, now seen corresponding path program 1 times [2021-11-23 17:25:13,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:13,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [943375814] [2021-11-23 17:25:13,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:13,407 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:13,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:13,407 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:13,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Waiting until timeout for monitored process [2021-11-23 17:25:13,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:13,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:25:13,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:14,511 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 84 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 17:25:14,511 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:25:14,512 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:14,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [943375814] [2021-11-23 17:25:14,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [943375814] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:25:14,512 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:25:14,512 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:25:14,512 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885168635] [2021-11-23 17:25:14,513 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:25:14,513 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:25:14,513 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:14,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:25:14,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:25:14,514 INFO L87 Difference]: Start difference. First operand 3027 states and 4214 transitions. Second operand has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 5 states have internal predecessors, (104), 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 17:25:14,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:14,642 INFO L93 Difference]: Finished difference Result 3481 states and 4801 transitions. [2021-11-23 17:25:14,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:25:14,642 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 5 states have internal predecessors, (104), 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 112 [2021-11-23 17:25:14,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:14,645 INFO L225 Difference]: With dead ends: 3481 [2021-11-23 17:25:14,645 INFO L226 Difference]: Without dead ends: 3029 [2021-11-23 17:25:14,647 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:25:14,647 INFO L933 BasicCegarLoop]: 1514 mSDtfsCounter, 1489 mSDsluCounter, 1599 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1489 SdHoareTripleChecker+Valid, 3113 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:14,647 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1489 Valid, 3113 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 7 Invalid, 0 Unknown, 33 Unchecked, 0.0s Time] [2021-11-23 17:25:14,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3029 states. [2021-11-23 17:25:14,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3029 to 3027. [2021-11-23 17:25:14,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3027 states, 3025 states have (on average 1.3887603305785123) internal successors, (4201), 3026 states have internal predecessors, (4201), 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 17:25:14,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3027 states to 3027 states and 4201 transitions. [2021-11-23 17:25:14,794 INFO L78 Accepts]: Start accepts. Automaton has 3027 states and 4201 transitions. Word has length 112 [2021-11-23 17:25:14,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:14,794 INFO L470 AbstractCegarLoop]: Abstraction has 3027 states and 4201 transitions. [2021-11-23 17:25:14,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 5 states have internal predecessors, (104), 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 17:25:14,794 INFO L276 IsEmpty]: Start isEmpty. Operand 3027 states and 4201 transitions. [2021-11-23 17:25:14,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:25:14,796 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:14,797 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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] [2021-11-23 17:25:14,820 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:15,010 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:25:15,010 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:15,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:15,011 INFO L85 PathProgramCache]: Analyzing trace with hash -604864759, now seen corresponding path program 1 times [2021-11-23 17:25:15,011 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:15,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [179875966] [2021-11-23 17:25:15,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:15,011 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:15,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:15,012 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:15,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (76)] Waiting until timeout for monitored process [2021-11-23 17:25:15,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:15,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:25:15,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:17,191 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 63 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:25:17,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:17,896 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 63 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:25:17,896 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:17,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [179875966] [2021-11-23 17:25:17,896 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [179875966] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:17,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [590225618] [2021-11-23 17:25:17,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:17,897 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:17,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:17,898 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:17,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (77)] Waiting until timeout for monitored process [2021-11-23 17:25:18,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:18,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:25:18,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:19,653 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:25:19,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:20,467 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:25:20,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [590225618] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:20,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839267636] [2021-11-23 17:25:20,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:20,468 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:20,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:20,469 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:20,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2021-11-23 17:25:20,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:20,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:25:20,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:21,696 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:25:21,696 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:22,357 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:25:22,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [839267636] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:22,357 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:22,357 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:25:22,357 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648844091] [2021-11-23 17:25:22,357 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:22,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:25:22,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:22,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:25:22,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:25:22,359 INFO L87 Difference]: Start difference. First operand 3027 states and 4201 transitions. Second operand has 32 states, 32 states have (on average 9.9375) internal successors, (318), 31 states have internal predecessors, (318), 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 17:25:23,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:23,951 INFO L93 Difference]: Finished difference Result 4147 states and 5625 transitions. [2021-11-23 17:25:23,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:25:23,952 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 9.9375) internal successors, (318), 31 states have internal predecessors, (318), 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 112 [2021-11-23 17:25:23,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:23,955 INFO L225 Difference]: With dead ends: 4147 [2021-11-23 17:25:23,955 INFO L226 Difference]: Without dead ends: 3691 [2021-11-23 17:25:23,957 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 693 GetRequests, 641 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=299, Invalid=2353, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 17:25:23,957 INFO L933 BasicCegarLoop]: 1525 mSDtfsCounter, 8867 mSDsluCounter, 30368 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8867 SdHoareTripleChecker+Valid, 31893 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 154 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:23,957 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8867 Valid, 31893 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 37 Invalid, 0 Unknown, 154 Unchecked, 0.0s Time] [2021-11-23 17:25:23,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3691 states. [2021-11-23 17:25:24,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3691 to 3655. [2021-11-23 17:25:24,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3655 states, 3653 states have (on average 1.3670955379140433) internal successors, (4994), 3654 states have internal predecessors, (4994), 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 17:25:24,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3655 states to 3655 states and 4994 transitions. [2021-11-23 17:25:24,113 INFO L78 Accepts]: Start accepts. Automaton has 3655 states and 4994 transitions. Word has length 112 [2021-11-23 17:25:24,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:24,113 INFO L470 AbstractCegarLoop]: Abstraction has 3655 states and 4994 transitions. [2021-11-23 17:25:24,113 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 9.9375) internal successors, (318), 31 states have internal predecessors, (318), 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 17:25:24,113 INFO L276 IsEmpty]: Start isEmpty. Operand 3655 states and 4994 transitions. [2021-11-23 17:25:24,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:25:24,115 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:24,116 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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] [2021-11-23 17:25:24,121 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (77)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:24,326 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (76)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:24,538 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Ended with exit code 0 [2021-11-23 17:25:24,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:24,718 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:24,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:24,719 INFO L85 PathProgramCache]: Analyzing trace with hash -840749559, now seen corresponding path program 1 times [2021-11-23 17:25:24,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:24,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [177620841] [2021-11-23 17:25:24,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:24,719 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:24,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:24,721 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:24,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Waiting until timeout for monitored process [2021-11-23 17:25:24,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:24,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:25:24,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:26,407 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 67 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:25:26,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:27,266 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 67 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:25:27,267 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:27,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [177620841] [2021-11-23 17:25:27,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [177620841] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:27,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1288568525] [2021-11-23 17:25:27,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:27,267 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:27,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:27,268 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:27,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (80)] Waiting until timeout for monitored process [2021-11-23 17:25:27,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:27,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:25:27,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:28,539 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:25:28,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:29,159 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:25:29,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1288568525] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:29,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [995742795] [2021-11-23 17:25:29,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:29,159 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:29,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:29,160 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:29,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2021-11-23 17:25:29,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:29,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:25:29,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:30,421 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:25:30,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:31,022 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:25:31,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [995742795] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:31,022 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:31,023 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 19 [2021-11-23 17:25:31,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683905208] [2021-11-23 17:25:31,023 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:31,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 17:25:31,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:31,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 17:25:31,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:25:31,025 INFO L87 Difference]: Start difference. First operand 3655 states and 4994 transitions. Second operand has 20 states, 20 states have (on average 11.45) internal successors, (229), 19 states have internal predecessors, (229), 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 17:25:31,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:31,779 INFO L93 Difference]: Finished difference Result 5529 states and 7367 transitions. [2021-11-23 17:25:31,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 17:25:31,779 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 11.45) internal successors, (229), 19 states have internal predecessors, (229), 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 112 [2021-11-23 17:25:31,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:31,784 INFO L225 Difference]: With dead ends: 5529 [2021-11-23 17:25:31,784 INFO L226 Difference]: Without dead ends: 5069 [2021-11-23 17:25:31,785 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 679 GetRequests, 651 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=155, Invalid=715, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:25:31,786 INFO L933 BasicCegarLoop]: 1531 mSDtfsCounter, 7466 mSDsluCounter, 12292 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7466 SdHoareTripleChecker+Valid, 13823 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 133 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:31,786 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7466 Valid, 13823 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 62 Invalid, 0 Unknown, 133 Unchecked, 0.1s Time] [2021-11-23 17:25:31,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5069 states. [2021-11-23 17:25:32,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5069 to 5024. [2021-11-23 17:25:32,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5024 states, 5022 states have (on average 1.3321385902031064) internal successors, (6690), 5023 states have internal predecessors, (6690), 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 17:25:32,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5024 states to 5024 states and 6690 transitions. [2021-11-23 17:25:32,059 INFO L78 Accepts]: Start accepts. Automaton has 5024 states and 6690 transitions. Word has length 112 [2021-11-23 17:25:32,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:32,059 INFO L470 AbstractCegarLoop]: Abstraction has 5024 states and 6690 transitions. [2021-11-23 17:25:32,059 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 11.45) internal successors, (229), 19 states have internal predecessors, (229), 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 17:25:32,059 INFO L276 IsEmpty]: Start isEmpty. Operand 5024 states and 6690 transitions. [2021-11-23 17:25:32,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:25:32,061 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:32,061 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 17:25:32,073 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:32,283 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Ended with exit code 0 [2021-11-23 17:25:32,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (80)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:32,662 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:32,662 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:32,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:32,662 INFO L85 PathProgramCache]: Analyzing trace with hash -803262144, now seen corresponding path program 1 times [2021-11-23 17:25:32,663 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:32,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2063582182] [2021-11-23 17:25:32,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:32,663 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:32,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:32,664 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:32,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Waiting until timeout for monitored process [2021-11-23 17:25:32,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:32,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:25:32,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:34,521 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:25:34,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:35,265 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:25:35,265 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:35,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2063582182] [2021-11-23 17:25:35,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2063582182] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:35,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1939599528] [2021-11-23 17:25:35,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:35,266 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:35,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:35,267 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:35,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (83)] Waiting until timeout for monitored process [2021-11-23 17:25:35,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:35,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:25:35,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:37,036 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:25:37,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:37,597 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:25:37,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1939599528] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:37,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [27095933] [2021-11-23 17:25:37,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:37,598 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:37,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:37,599 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:37,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2021-11-23 17:25:37,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:37,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:25:37,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:39,306 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:25:39,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:39,936 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:25:39,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [27095933] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:39,937 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:39,937 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:25:39,937 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560441254] [2021-11-23 17:25:39,937 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:39,938 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:25:39,938 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:39,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:25:39,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:25:39,939 INFO L87 Difference]: Start difference. First operand 5024 states and 6690 transitions. Second operand has 16 states, 16 states have (on average 11.3125) internal successors, (181), 15 states have internal predecessors, (181), 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 17:25:40,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:40,619 INFO L93 Difference]: Finished difference Result 8045 states and 10499 transitions. [2021-11-23 17:25:40,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:25:40,620 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.3125) internal successors, (181), 15 states have internal predecessors, (181), 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 112 [2021-11-23 17:25:40,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:40,626 INFO L225 Difference]: With dead ends: 8045 [2021-11-23 17:25:40,626 INFO L226 Difference]: Without dead ends: 7006 [2021-11-23 17:25:40,629 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 676 GetRequests, 654 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=119, Invalid=433, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:25:40,629 INFO L933 BasicCegarLoop]: 1522 mSDtfsCounter, 5874 mSDsluCounter, 7839 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5874 SdHoareTripleChecker+Valid, 9361 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 91 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:40,630 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5874 Valid, 9361 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 51 Invalid, 0 Unknown, 91 Unchecked, 0.1s Time] [2021-11-23 17:25:40,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7006 states. [2021-11-23 17:25:41,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7006 to 6982. [2021-11-23 17:25:41,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6982 states, 6980 states have (on average 1.3035816618911176) internal successors, (9099), 6981 states have internal predecessors, (9099), 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 17:25:41,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6982 states to 6982 states and 9099 transitions. [2021-11-23 17:25:41,126 INFO L78 Accepts]: Start accepts. Automaton has 6982 states and 9099 transitions. Word has length 112 [2021-11-23 17:25:41,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:41,127 INFO L470 AbstractCegarLoop]: Abstraction has 6982 states and 9099 transitions. [2021-11-23 17:25:41,127 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.3125) internal successors, (181), 15 states have internal predecessors, (181), 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 17:25:41,127 INFO L276 IsEmpty]: Start isEmpty. Operand 6982 states and 9099 transitions. [2021-11-23 17:25:41,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:25:41,130 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:41,131 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 17:25:41,158 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:41,355 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:41,548 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (83)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:41,746 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:41,747 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:41,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:41,747 INFO L85 PathProgramCache]: Analyzing trace with hash 1625052194, now seen corresponding path program 1 times [2021-11-23 17:25:41,748 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:41,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2061931554] [2021-11-23 17:25:41,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:41,748 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:41,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:41,749 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:41,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (85)] Waiting until timeout for monitored process [2021-11-23 17:25:41,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:41,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:25:41,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:42,799 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 78 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 17:25:42,799 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:25:42,799 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:42,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2061931554] [2021-11-23 17:25:42,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2061931554] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:25:42,800 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:25:42,800 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:25:42,800 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537074571] [2021-11-23 17:25:42,800 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:25:42,800 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:25:42,800 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:42,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:25:42,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:25:42,801 INFO L87 Difference]: Start difference. First operand 6982 states and 9099 transitions. Second operand has 6 states, 6 states have (on average 17.5) internal successors, (105), 5 states have internal predecessors, (105), 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 17:25:43,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:43,212 INFO L93 Difference]: Finished difference Result 8641 states and 11197 transitions. [2021-11-23 17:25:43,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:25:43,213 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.5) internal successors, (105), 5 states have internal predecessors, (105), 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 112 [2021-11-23 17:25:43,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:43,220 INFO L225 Difference]: With dead ends: 8641 [2021-11-23 17:25:43,220 INFO L226 Difference]: Without dead ends: 7409 [2021-11-23 17:25:43,223 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:25:43,223 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 1512 mSDsluCounter, 1572 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1512 SdHoareTripleChecker+Valid, 3093 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:43,224 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1512 Valid, 3093 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 29 Unchecked, 0.0s Time] [2021-11-23 17:25:43,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7409 states. [2021-11-23 17:25:43,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7409 to 7387. [2021-11-23 17:25:43,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7387 states, 7385 states have (on average 1.297088693297224) internal successors, (9579), 7386 states have internal predecessors, (9579), 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 17:25:43,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7387 states to 7387 states and 9579 transitions. [2021-11-23 17:25:43,639 INFO L78 Accepts]: Start accepts. Automaton has 7387 states and 9579 transitions. Word has length 112 [2021-11-23 17:25:43,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:43,640 INFO L470 AbstractCegarLoop]: Abstraction has 7387 states and 9579 transitions. [2021-11-23 17:25:43,640 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.5) internal successors, (105), 5 states have internal predecessors, (105), 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 17:25:43,640 INFO L276 IsEmpty]: Start isEmpty. Operand 7387 states and 9579 transitions. [2021-11-23 17:25:43,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:25:43,643 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:43,643 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 17:25:43,656 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (85)] Ended with exit code 0 [2021-11-23 17:25:43,856 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:25:43,856 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:43,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:43,857 INFO L85 PathProgramCache]: Analyzing trace with hash 1933874233, now seen corresponding path program 1 times [2021-11-23 17:25:43,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:43,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [183077740] [2021-11-23 17:25:43,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:43,857 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:43,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:43,859 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:43,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Waiting until timeout for monitored process [2021-11-23 17:25:43,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:43,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:25:43,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:46,622 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:46,623 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:47,685 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:47,685 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:47,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [183077740] [2021-11-23 17:25:47,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [183077740] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:47,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1104605770] [2021-11-23 17:25:47,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:47,686 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:47,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:47,686 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:47,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Waiting until timeout for monitored process [2021-11-23 17:25:47,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:47,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:25:47,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:50,168 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:50,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:50,867 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:50,868 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1104605770] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:50,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [980290112] [2021-11-23 17:25:50,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:50,868 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:50,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:50,871 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:50,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-23 17:25:50,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:50,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:25:50,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:53,357 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:53,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:54,002 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:54,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [980290112] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:54,003 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:54,003 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13, 13] total 25 [2021-11-23 17:25:54,003 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200479434] [2021-11-23 17:25:54,003 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:54,004 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 17:25:54,004 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:54,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 17:25:54,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2021-11-23 17:25:54,005 INFO L87 Difference]: Start difference. First operand 7387 states and 9579 transitions. Second operand has 26 states, 26 states have (on average 8.115384615384615) internal successors, (211), 25 states have internal predecessors, (211), 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 17:25:54,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:54,851 INFO L93 Difference]: Finished difference Result 7768 states and 10069 transitions. [2021-11-23 17:25:54,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 17:25:54,852 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 8.115384615384615) internal successors, (211), 25 states have internal predecessors, (211), 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 112 [2021-11-23 17:25:54,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:54,859 INFO L225 Difference]: With dead ends: 7768 [2021-11-23 17:25:54,859 INFO L226 Difference]: Without dead ends: 7383 [2021-11-23 17:25:54,861 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 671 GetRequests, 643 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=125, Invalid=745, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:25:54,861 INFO L933 BasicCegarLoop]: 1530 mSDtfsCounter, 11675 mSDsluCounter, 22770 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11675 SdHoareTripleChecker+Valid, 24300 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 140 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:54,862 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11675 Valid, 24300 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 85 Invalid, 0 Unknown, 140 Unchecked, 0.1s Time] [2021-11-23 17:25:54,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7383 states. [2021-11-23 17:25:55,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7383 to 7375. [2021-11-23 17:25:55,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7375 states, 7373 states have (on average 1.2971653329716533) internal successors, (9564), 7374 states have internal predecessors, (9564), 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 17:25:55,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7375 states to 7375 states and 9564 transitions. [2021-11-23 17:25:55,312 INFO L78 Accepts]: Start accepts. Automaton has 7375 states and 9564 transitions. Word has length 112 [2021-11-23 17:25:55,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:55,312 INFO L470 AbstractCegarLoop]: Abstraction has 7375 states and 9564 transitions. [2021-11-23 17:25:55,312 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 8.115384615384615) internal successors, (211), 25 states have internal predecessors, (211), 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 17:25:55,312 INFO L276 IsEmpty]: Start isEmpty. Operand 7375 states and 9564 transitions. [2021-11-23 17:25:55,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:25:55,314 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:55,315 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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] [2021-11-23 17:25:55,340 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:55,526 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Ended with exit code 0 [2021-11-23 17:25:55,717 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Ended with exit code 0 [2021-11-23 17:25:55,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:55,915 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:55,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:55,916 INFO L85 PathProgramCache]: Analyzing trace with hash 228754537, now seen corresponding path program 1 times [2021-11-23 17:25:55,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:55,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1930361719] [2021-11-23 17:25:55,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:55,916 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:55,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:55,917 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:55,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Waiting until timeout for monitored process [2021-11-23 17:25:55,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:55,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:25:55,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:58,219 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 58 proven. 32 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:25:58,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:59,142 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 58 proven. 32 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:25:59,143 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:59,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1930361719] [2021-11-23 17:25:59,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1930361719] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:59,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [858455339] [2021-11-23 17:25:59,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:59,143 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:59,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:59,144 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:59,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Waiting until timeout for monitored process [2021-11-23 17:25:59,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:59,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:25:59,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:03,012 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:03,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:04,280 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:04,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [858455339] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:04,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [673399452] [2021-11-23 17:26:04,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:04,281 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:04,281 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:26:04,282 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:26:04,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2021-11-23 17:26:04,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:04,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:26:04,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:07,101 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:07,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:07,885 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:07,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [673399452] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:07,886 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:26:07,886 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 13, 13] total 39 [2021-11-23 17:26:07,886 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396890037] [2021-11-23 17:26:07,886 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:26:07,887 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-23 17:26:07,887 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:26:07,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-23 17:26:07,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1425, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 17:26:07,888 INFO L87 Difference]: Start difference. First operand 7375 states and 9564 transitions. Second operand has 40 states, 40 states have (on average 9.125) internal successors, (365), 39 states have internal predecessors, (365), 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 17:26:23,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:26:23,098 INFO L93 Difference]: Finished difference Result 16814 states and 21345 transitions. [2021-11-23 17:26:23,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 163 states. [2021-11-23 17:26:23,099 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 9.125) internal successors, (365), 39 states have internal predecessors, (365), 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 112 [2021-11-23 17:26:23,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:26:23,116 INFO L225 Difference]: With dead ends: 16814 [2021-11-23 17:26:23,116 INFO L226 Difference]: Without dead ends: 14445 [2021-11-23 17:26:23,123 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 841 GetRequests, 641 SyntacticMatches, 6 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14501 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=2813, Invalid=35407, Unknown=0, NotChecked=0, Total=38220 [2021-11-23 17:26:23,124 INFO L933 BasicCegarLoop]: 1610 mSDtfsCounter, 16946 mSDsluCounter, 30653 mSDsCounter, 0 mSdLazyCounter, 1739 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16946 SdHoareTripleChecker+Valid, 32263 SdHoareTripleChecker+Invalid, 4340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 1739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2465 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:26:23,125 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16946 Valid, 32263 Invalid, 4340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 1739 Invalid, 0 Unknown, 2465 Unchecked, 2.6s Time] [2021-11-23 17:26:23,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14445 states. [2021-11-23 17:26:23,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14445 to 5800. [2021-11-23 17:26:23,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5800 states, 5798 states have (on average 1.3132114522249052) internal successors, (7614), 5799 states have internal predecessors, (7614), 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 17:26:23,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5800 states to 5800 states and 7614 transitions. [2021-11-23 17:26:23,600 INFO L78 Accepts]: Start accepts. Automaton has 5800 states and 7614 transitions. Word has length 112 [2021-11-23 17:26:23,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:26:23,601 INFO L470 AbstractCegarLoop]: Abstraction has 5800 states and 7614 transitions. [2021-11-23 17:26:23,601 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 9.125) internal successors, (365), 39 states have internal predecessors, (365), 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 17:26:23,601 INFO L276 IsEmpty]: Start isEmpty. Operand 5800 states and 7614 transitions. [2021-11-23 17:26:23,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:26:23,604 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:26:23,604 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 17:26:23,609 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:23,813 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:24,025 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Ended with exit code 0 [2021-11-23 17:26:24,204 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:24,205 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:26:24,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:26:24,205 INFO L85 PathProgramCache]: Analyzing trace with hash -1937446341, now seen corresponding path program 1 times [2021-11-23 17:26:24,206 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:26:24,206 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [901326979] [2021-11-23 17:26:24,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:24,206 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:26:24,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:26:24,207 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:26:24,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Waiting until timeout for monitored process [2021-11-23 17:26:24,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:24,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:26:24,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:26,156 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 64 proven. 20 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:26:26,156 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:27,096 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 64 proven. 20 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:26:27,096 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:26:27,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [901326979] [2021-11-23 17:26:27,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [901326979] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:27,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1616014965] [2021-11-23 17:26:27,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:27,096 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:26:27,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:26:27,097 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:26:27,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (93)] Waiting until timeout for monitored process [2021-11-23 17:26:27,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:27,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:26:27,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:28,916 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 64 proven. 20 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:26:28,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:29,641 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 64 proven. 20 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:26:29,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1616014965] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:29,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [838207283] [2021-11-23 17:26:29,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:29,642 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:29,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:26:29,643 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:26:29,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2021-11-23 17:26:29,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:29,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:26:29,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:31,501 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 64 proven. 20 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:26:31,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:32,274 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 64 proven. 20 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:26:32,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [838207283] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:32,274 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:26:32,275 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10, 10] total 19 [2021-11-23 17:26:32,275 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454031319] [2021-11-23 17:26:32,275 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:26:32,276 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 17:26:32,276 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:26:32,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 17:26:32,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:26:32,311 INFO L87 Difference]: Start difference. First operand 5800 states and 7614 transitions. Second operand has 20 states, 20 states have (on average 8.95) internal successors, (179), 19 states have internal predecessors, (179), 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 17:26:32,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:26:32,938 INFO L93 Difference]: Finished difference Result 8194 states and 10633 transitions. [2021-11-23 17:26:32,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:26:32,938 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 8.95) internal successors, (179), 19 states have internal predecessors, (179), 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 112 [2021-11-23 17:26:32,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:26:32,944 INFO L225 Difference]: With dead ends: 8194 [2021-11-23 17:26:32,944 INFO L226 Difference]: Without dead ends: 5503 [2021-11-23 17:26:32,948 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 671 GetRequests, 649 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:26:32,948 INFO L933 BasicCegarLoop]: 1519 mSDtfsCounter, 7289 mSDsluCounter, 15057 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7289 SdHoareTripleChecker+Valid, 16576 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 66 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:26:32,949 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7289 Valid, 16576 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 62 Invalid, 0 Unknown, 66 Unchecked, 0.1s Time] [2021-11-23 17:26:32,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5503 states. [2021-11-23 17:26:33,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5503 to 5503. [2021-11-23 17:26:33,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5503 states, 5501 states have (on average 1.315215415379022) internal successors, (7235), 5502 states have internal predecessors, (7235), 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 17:26:33,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5503 states to 5503 states and 7235 transitions. [2021-11-23 17:26:33,346 INFO L78 Accepts]: Start accepts. Automaton has 5503 states and 7235 transitions. Word has length 112 [2021-11-23 17:26:33,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:26:33,346 INFO L470 AbstractCegarLoop]: Abstraction has 5503 states and 7235 transitions. [2021-11-23 17:26:33,346 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 8.95) internal successors, (179), 19 states have internal predecessors, (179), 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 17:26:33,346 INFO L276 IsEmpty]: Start isEmpty. Operand 5503 states and 7235 transitions. [2021-11-23 17:26:33,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:26:33,348 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:26:33,348 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 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 17:26:33,361 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:33,550 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (93)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:33,774 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Ended with exit code 0 [2021-11-23 17:26:33,948 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:33,949 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:26:33,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:26:33,949 INFO L85 PathProgramCache]: Analyzing trace with hash 1117709487, now seen corresponding path program 1 times [2021-11-23 17:26:33,949 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:26:33,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1445499822] [2021-11-23 17:26:33,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:33,950 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:26:33,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:26:33,951 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:26:33,951 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Waiting until timeout for monitored process [2021-11-23 17:26:34,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:34,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:26:34,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:41,635 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 26 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:41,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:44,620 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:44,620 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:26:44,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1445499822] [2021-11-23 17:26:44,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1445499822] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:44,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [891106649] [2021-11-23 17:26:44,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:44,621 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:26:44,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:26:44,622 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:26:44,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Waiting until timeout for monitored process [2021-11-23 17:26:44,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:44,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 17:26:44,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:54,570 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 26 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:54,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:59,100 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:59,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [891106649] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:59,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [282317839] [2021-11-23 17:26:59,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:59,100 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:59,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:26:59,101 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:26:59,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2021-11-23 17:26:59,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:59,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:26:59,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:08,863 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:08,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:11,998 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:11,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [282317839] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:11,998 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:27:11,999 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20, 30, 24, 22, 17] total 105 [2021-11-23 17:27:11,999 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508959079] [2021-11-23 17:27:11,999 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:27:12,000 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2021-11-23 17:27:12,000 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:27:12,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2021-11-23 17:27:12,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=980, Invalid=9940, Unknown=0, NotChecked=0, Total=10920 [2021-11-23 17:27:12,001 INFO L87 Difference]: Start difference. First operand 5503 states and 7235 transitions. Second operand has 105 states, 105 states have (on average 4.771428571428571) internal successors, (501), 105 states have internal predecessors, (501), 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 17:27:22,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:27:22,213 INFO L93 Difference]: Finished difference Result 11426 states and 14470 transitions. [2021-11-23 17:27:22,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-23 17:27:22,213 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 4.771428571428571) internal successors, (501), 105 states have internal predecessors, (501), 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 113 [2021-11-23 17:27:22,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:27:22,222 INFO L225 Difference]: With dead ends: 11426 [2021-11-23 17:27:22,222 INFO L226 Difference]: Without dead ends: 8599 [2021-11-23 17:27:22,227 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 710 GetRequests, 572 SyntacticMatches, 2 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7380 ImplicationChecksByTransitivity, 24.0s TimeCoverageRelationStatistics Valid=1551, Invalid=17355, Unknown=0, NotChecked=0, Total=18906 [2021-11-23 17:27:22,227 INFO L933 BasicCegarLoop]: 1632 mSDtfsCounter, 23720 mSDsluCounter, 56009 mSDsCounter, 0 mSdLazyCounter, 1486 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23720 SdHoareTripleChecker+Valid, 57641 SdHoareTripleChecker+Invalid, 2132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 1486 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 591 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:27:22,228 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23720 Valid, 57641 Invalid, 2132 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [55 Valid, 1486 Invalid, 0 Unknown, 591 Unchecked, 2.9s Time] [2021-11-23 17:27:22,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8599 states. [2021-11-23 17:27:22,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8599 to 7370. [2021-11-23 17:27:22,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7370 states, 7368 states have (on average 1.2842019543973942) internal successors, (9462), 7369 states have internal predecessors, (9462), 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 17:27:22,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7370 states to 7370 states and 9462 transitions. [2021-11-23 17:27:22,827 INFO L78 Accepts]: Start accepts. Automaton has 7370 states and 9462 transitions. Word has length 113 [2021-11-23 17:27:22,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:27:22,828 INFO L470 AbstractCegarLoop]: Abstraction has 7370 states and 9462 transitions. [2021-11-23 17:27:22,828 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 105 states have (on average 4.771428571428571) internal successors, (501), 105 states have internal predecessors, (501), 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 17:27:22,828 INFO L276 IsEmpty]: Start isEmpty. Operand 7370 states and 9462 transitions. [2021-11-23 17:27:22,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:27:22,829 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:27:22,830 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 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 17:27:22,840 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Forceful destruction successful, exit code 0 [2021-11-23 17:27:23,031 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Ended with exit code 0 [2021-11-23 17:27:23,254 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Forceful destruction successful, exit code 0 [2021-11-23 17:27:23,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:27:23,431 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:27:23,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:27:23,431 INFO L85 PathProgramCache]: Analyzing trace with hash 2048005298, now seen corresponding path program 1 times [2021-11-23 17:27:23,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:27:23,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2125672514] [2021-11-23 17:27:23,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:27:23,432 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:27:23,432 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:27:23,432 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:27:23,433 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Waiting until timeout for monitored process [2021-11-23 17:27:23,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:27:23,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:27:23,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:24,870 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 52 proven. 38 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:27:24,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:25,537 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 65 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:27:25,537 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:27:25,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2125672514] [2021-11-23 17:27:25,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2125672514] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:25,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1205209680] [2021-11-23 17:27:25,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:27:25,538 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:27:25,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:27:25,538 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:27:25,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Waiting until timeout for monitored process [2021-11-23 17:27:25,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:27:25,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:27:25,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:27,292 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 52 proven. 38 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:27:27,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:27,669 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 65 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:27:27,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1205209680] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:27,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1115197748] [2021-11-23 17:27:27,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:27:27,669 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:27:27,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:27:27,670 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:27:27,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2021-11-23 17:27:27,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:27:27,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:27:27,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:28,698 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 54 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:27:28,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:29,065 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 65 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:27:29,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1115197748] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:29,066 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:27:29,066 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 15, 11, 12, 11] total 33 [2021-11-23 17:27:29,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060663062] [2021-11-23 17:27:29,066 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:27:29,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-23 17:27:29,067 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:27:29,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-23 17:27:29,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=893, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 17:27:29,067 INFO L87 Difference]: Start difference. First operand 7370 states and 9462 transitions. Second operand has 33 states, 33 states have (on average 8.242424242424242) internal successors, (272), 33 states have internal predecessors, (272), 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 17:27:30,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:27:30,710 INFO L93 Difference]: Finished difference Result 16106 states and 20271 transitions. [2021-11-23 17:27:30,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-23 17:27:30,711 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 8.242424242424242) internal successors, (272), 33 states have internal predecessors, (272), 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 113 [2021-11-23 17:27:30,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:27:30,721 INFO L225 Difference]: With dead ends: 16106 [2021-11-23 17:27:30,721 INFO L226 Difference]: Without dead ends: 11494 [2021-11-23 17:27:30,725 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 685 GetRequests, 644 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 505 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=270, Invalid=1536, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 17:27:30,726 INFO L933 BasicCegarLoop]: 1599 mSDtfsCounter, 3378 mSDsluCounter, 18282 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3378 SdHoareTripleChecker+Valid, 19881 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 78 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:27:30,726 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3378 Valid, 19881 Invalid, 259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 175 Invalid, 0 Unknown, 78 Unchecked, 0.2s Time] [2021-11-23 17:27:30,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11494 states. [2021-11-23 17:27:31,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11494 to 10052. [2021-11-23 17:27:31,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10052 states, 10050 states have (on average 1.270547263681592) internal successors, (12769), 10051 states have internal predecessors, (12769), 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 17:27:31,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10052 states to 10052 states and 12769 transitions. [2021-11-23 17:27:31,569 INFO L78 Accepts]: Start accepts. Automaton has 10052 states and 12769 transitions. Word has length 113 [2021-11-23 17:27:31,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:27:31,569 INFO L470 AbstractCegarLoop]: Abstraction has 10052 states and 12769 transitions. [2021-11-23 17:27:31,570 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 8.242424242424242) internal successors, (272), 33 states have internal predecessors, (272), 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 17:27:31,570 INFO L276 IsEmpty]: Start isEmpty. Operand 10052 states and 12769 transitions. [2021-11-23 17:27:31,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:27:31,571 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:27:31,571 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 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 17:27:31,573 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Forceful destruction successful, exit code 0 [2021-11-23 17:27:31,793 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Ended with exit code 0 [2021-11-23 17:27:31,981 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Ended with exit code 0 [2021-11-23 17:27:32,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:27:32,172 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:27:32,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:27:32,173 INFO L85 PathProgramCache]: Analyzing trace with hash -1844428728, now seen corresponding path program 1 times [2021-11-23 17:27:32,173 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:27:32,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1797806569] [2021-11-23 17:27:32,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:27:32,173 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:27:32,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:27:32,176 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:27:32,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Waiting until timeout for monitored process [2021-11-23 17:27:32,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:27:32,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:27:32,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:33,800 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 27 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:33,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:34,562 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 44 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:34,562 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:27:34,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1797806569] [2021-11-23 17:27:34,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1797806569] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:34,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1231370983] [2021-11-23 17:27:34,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:27:34,563 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:27:34,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:27:34,563 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:27:34,565 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (102)] Waiting until timeout for monitored process [2021-11-23 17:27:34,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:27:34,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:27:34,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:35,975 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 27 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:35,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:36,424 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 44 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:36,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1231370983] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:36,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355477613] [2021-11-23 17:27:36,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:27:36,424 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:27:36,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:27:36,425 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:27:36,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2021-11-23 17:27:36,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:27:36,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:27:36,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:41,850 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:41,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:43,092 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 44 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:43,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355477613] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:43,093 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:27:43,093 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 14, 11, 21, 15] total 48 [2021-11-23 17:27:43,093 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527983775] [2021-11-23 17:27:43,093 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:27:43,094 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:27:43,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:27:43,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:27:43,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=256, Invalid=2000, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:27:43,095 INFO L87 Difference]: Start difference. First operand 10052 states and 12769 transitions. Second operand has 48 states, 48 states have (on average 6.9375) internal successors, (333), 48 states have internal predecessors, (333), 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 17:27:46,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:27:46,209 INFO L93 Difference]: Finished difference Result 23450 states and 29282 transitions. [2021-11-23 17:27:46,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-23 17:27:46,210 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 6.9375) internal successors, (333), 48 states have internal predecessors, (333), 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 113 [2021-11-23 17:27:46,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:27:46,226 INFO L225 Difference]: With dead ends: 23450 [2021-11-23 17:27:46,226 INFO L226 Difference]: Without dead ends: 16259 [2021-11-23 17:27:46,232 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 702 GetRequests, 637 SyntacticMatches, 6 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1199 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=412, Invalid=3248, Unknown=0, NotChecked=0, Total=3660 [2021-11-23 17:27:46,233 INFO L933 BasicCegarLoop]: 1580 mSDtfsCounter, 4883 mSDsluCounter, 32305 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4883 SdHoareTripleChecker+Valid, 33885 SdHoareTripleChecker+Invalid, 719 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 411 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:27:46,233 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4883 Valid, 33885 Invalid, 719 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 297 Invalid, 0 Unknown, 411 Unchecked, 0.5s Time] [2021-11-23 17:27:46,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16259 states. [2021-11-23 17:27:47,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16259 to 13926. [2021-11-23 17:27:47,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13926 states, 13924 states have (on average 1.2571100258546395) internal successors, (17504), 13925 states have internal predecessors, (17504), 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 17:27:47,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13926 states to 13926 states and 17504 transitions. [2021-11-23 17:27:47,540 INFO L78 Accepts]: Start accepts. Automaton has 13926 states and 17504 transitions. Word has length 113 [2021-11-23 17:27:47,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:27:47,540 INFO L470 AbstractCegarLoop]: Abstraction has 13926 states and 17504 transitions. [2021-11-23 17:27:47,540 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 6.9375) internal successors, (333), 48 states have internal predecessors, (333), 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 17:27:47,541 INFO L276 IsEmpty]: Start isEmpty. Operand 13926 states and 17504 transitions. [2021-11-23 17:27:47,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:27:47,542 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:27:47,543 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 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 17:27:47,565 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Ended with exit code 0 [2021-11-23 17:27:47,751 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Ended with exit code 0 [2021-11-23 17:27:47,945 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (102)] Forceful destruction successful, exit code 0 [2021-11-23 17:27:48,144 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:27:48,145 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:27:48,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:27:48,145 INFO L85 PathProgramCache]: Analyzing trace with hash 588226190, now seen corresponding path program 1 times [2021-11-23 17:27:48,145 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:27:48,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [686159685] [2021-11-23 17:27:48,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:27:48,146 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:27:48,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:27:48,147 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:27:48,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Waiting until timeout for monitored process [2021-11-23 17:27:48,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:27:48,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:27:48,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:55,356 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 35 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:55,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:59,653 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 25 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:59,653 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:27:59,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [686159685] [2021-11-23 17:27:59,653 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [686159685] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:59,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [421186760] [2021-11-23 17:27:59,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:27:59,653 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:27:59,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:27:59,654 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:27:59,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (105)] Waiting until timeout for monitored process [2021-11-23 17:27:59,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:27:59,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 17:27:59,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:08,437 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 35 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:08,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:16,889 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 21 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:16,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [421186760] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:16,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [664114091] [2021-11-23 17:28:16,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:16,889 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:28:16,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:28:16,890 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:28:16,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2021-11-23 17:28:16,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:16,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 17:28:16,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:23,449 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 35 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:23,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:30,389 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 21 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:30,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [664114091] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:30,389 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:28:30,390 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 30, 28, 24, 24] total 133 [2021-11-23 17:28:30,390 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489450305] [2021-11-23 17:28:30,390 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:28:30,391 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2021-11-23 17:28:30,391 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:30,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2021-11-23 17:28:30,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2045, Invalid=15511, Unknown=0, NotChecked=0, Total=17556 [2021-11-23 17:28:30,393 INFO L87 Difference]: Start difference. First operand 13926 states and 17504 transitions. Second operand has 133 states, 133 states have (on average 3.917293233082707) internal successors, (521), 133 states have internal predecessors, (521), 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 17:28:49,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:49,866 INFO L93 Difference]: Finished difference Result 25709 states and 31909 transitions. [2021-11-23 17:28:49,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-11-23 17:28:49,867 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 3.917293233082707) internal successors, (521), 133 states have internal predecessors, (521), 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 113 [2021-11-23 17:28:49,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:49,888 INFO L225 Difference]: With dead ends: 25709 [2021-11-23 17:28:49,888 INFO L226 Difference]: Without dead ends: 16204 [2021-11-23 17:28:49,899 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 731 GetRequests, 557 SyntacticMatches, 4 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10801 ImplicationChecksByTransitivity, 39.6s TimeCoverageRelationStatistics Valid=3476, Invalid=25936, Unknown=0, NotChecked=0, Total=29412 [2021-11-23 17:28:49,899 INFO L933 BasicCegarLoop]: 1548 mSDtfsCounter, 31840 mSDsluCounter, 55215 mSDsCounter, 0 mSdLazyCounter, 1430 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31840 SdHoareTripleChecker+Valid, 56763 SdHoareTripleChecker+Invalid, 1886 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 1430 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 381 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:49,900 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31840 Valid, 56763 Invalid, 1886 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [75 Valid, 1430 Invalid, 0 Unknown, 381 Unchecked, 3.2s Time] [2021-11-23 17:28:49,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16204 states. [2021-11-23 17:28:51,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16204 to 13936. [2021-11-23 17:28:51,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13936 states, 13934 states have (on average 1.2570690397588633) internal successors, (17516), 13935 states have internal predecessors, (17516), 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 17:28:51,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13936 states to 13936 states and 17516 transitions. [2021-11-23 17:28:51,547 INFO L78 Accepts]: Start accepts. Automaton has 13936 states and 17516 transitions. Word has length 113 [2021-11-23 17:28:51,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:51,547 INFO L470 AbstractCegarLoop]: Abstraction has 13936 states and 17516 transitions. [2021-11-23 17:28:51,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 3.917293233082707) internal successors, (521), 133 states have internal predecessors, (521), 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 17:28:51,548 INFO L276 IsEmpty]: Start isEmpty. Operand 13936 states and 17516 transitions. [2021-11-23 17:28:51,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:28:51,550 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:51,550 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 17:28:51,577 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:51,762 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:51,953 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (105)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:52,151 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:52,151 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:52,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:52,152 INFO L85 PathProgramCache]: Analyzing trace with hash -1890239409, now seen corresponding path program 1 times [2021-11-23 17:28:52,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:52,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1540249761] [2021-11-23 17:28:52,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:52,152 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:52,153 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:52,153 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:52,156 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (107)] Waiting until timeout for monitored process [2021-11-23 17:28:52,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:52,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:28:52,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:02,207 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:02,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:06,253 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:06,254 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:06,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1540249761] [2021-11-23 17:29:06,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1540249761] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:06,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1084296871] [2021-11-23 17:29:06,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:06,254 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:29:06,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:29:06,256 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:29:06,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (108)] Waiting until timeout for monitored process [2021-11-23 17:29:06,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:06,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:29:06,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:16,169 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:16,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:20,183 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:20,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1084296871] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:20,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [301057068] [2021-11-23 17:29:20,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:20,184 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:29:20,184 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:29:20,185 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:29:20,185 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Waiting until timeout for monitored process [2021-11-23 17:29:20,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:20,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:29:20,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:25,260 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:25,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:27,632 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:27,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [301057068] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:27,633 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:29:27,633 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 22, 28, 24, 18, 17] total 104 [2021-11-23 17:29:27,633 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048408079] [2021-11-23 17:29:27,633 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:29:27,634 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2021-11-23 17:29:27,634 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:27,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2021-11-23 17:29:27,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=977, Invalid=9735, Unknown=0, NotChecked=0, Total=10712 [2021-11-23 17:29:27,635 INFO L87 Difference]: Start difference. First operand 13936 states and 17516 transitions. Second operand has 104 states, 104 states have (on average 4.730769230769231) internal successors, (492), 104 states have internal predecessors, (492), 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 17:30:47,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:47,879 INFO L93 Difference]: Finished difference Result 33292 states and 41103 transitions. [2021-11-23 17:30:47,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 216 states. [2021-11-23 17:30:47,880 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 4.730769230769231) internal successors, (492), 104 states have internal predecessors, (492), 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 113 [2021-11-23 17:30:47,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:47,912 INFO L225 Difference]: With dead ends: 33292 [2021-11-23 17:30:47,912 INFO L226 Difference]: Without dead ends: 28232 [2021-11-23 17:30:47,924 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 894 GetRequests, 594 SyntacticMatches, 2 SemanticMatches, 298 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34147 ImplicationChecksByTransitivity, 86.6s TimeCoverageRelationStatistics Valid=6691, Invalid=83009, Unknown=0, NotChecked=0, Total=89700 [2021-11-23 17:30:47,924 INFO L933 BasicCegarLoop]: 1650 mSDtfsCounter, 29982 mSDsluCounter, 52549 mSDsCounter, 0 mSdLazyCounter, 3086 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29982 SdHoareTripleChecker+Valid, 54199 SdHoareTripleChecker+Invalid, 5558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 3086 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2306 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:47,925 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29982 Valid, 54199 Invalid, 5558 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [166 Valid, 3086 Invalid, 0 Unknown, 2306 Unchecked, 6.7s Time] [2021-11-23 17:30:47,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28232 states. [2021-11-23 17:30:49,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28232 to 14505. [2021-11-23 17:30:49,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14505 states, 14503 states have (on average 1.2560849479418053) internal successors, (18217), 14504 states have internal predecessors, (18217), 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 17:30:49,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14505 states to 14505 states and 18217 transitions. [2021-11-23 17:30:49,819 INFO L78 Accepts]: Start accepts. Automaton has 14505 states and 18217 transitions. Word has length 113 [2021-11-23 17:30:49,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:49,819 INFO L470 AbstractCegarLoop]: Abstraction has 14505 states and 18217 transitions. [2021-11-23 17:30:49,819 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 4.730769230769231) internal successors, (492), 104 states have internal predecessors, (492), 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 17:30:49,819 INFO L276 IsEmpty]: Start isEmpty. Operand 14505 states and 18217 transitions. [2021-11-23 17:30:49,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 17:30:49,821 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:49,821 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 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 17:30:49,844 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Ended with exit code 0 [2021-11-23 17:30:50,031 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (107)] Ended with exit code 0 [2021-11-23 17:30:50,223 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (108)] Ended with exit code 0 [2021-11-23 17:30:50,422 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:50,423 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:50,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:50,424 INFO L85 PathProgramCache]: Analyzing trace with hash 1781048702, now seen corresponding path program 1 times [2021-11-23 17:30:50,424 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:50,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [617272375] [2021-11-23 17:30:50,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:50,425 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:50,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:50,426 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:50,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (110)] Waiting until timeout for monitored process [2021-11-23 17:30:50,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:50,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:30:50,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:55,955 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:55,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:58,432 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:58,432 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:58,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [617272375] [2021-11-23 17:30:58,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [617272375] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:58,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [790576427] [2021-11-23 17:30:58,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:58,433 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:58,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:58,434 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:58,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (111)] Waiting until timeout for monitored process [2021-11-23 17:30:58,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:58,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:30:58,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:03,964 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:03,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:04,789 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:04,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [790576427] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:04,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [925304809] [2021-11-23 17:31:04,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:04,789 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:04,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:04,790 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:04,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Waiting until timeout for monitored process [2021-11-23 17:31:04,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:04,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:31:04,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:10,378 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:10,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:11,480 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:11,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [925304809] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:11,480 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:11,481 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19, 18, 18, 17] total 51 [2021-11-23 17:31:11,481 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226619331] [2021-11-23 17:31:11,481 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:11,482 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 17:31:11,482 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:11,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 17:31:11,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=2336, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 17:31:11,482 INFO L87 Difference]: Start difference. First operand 14505 states and 18217 transitions. Second operand has 51 states, 51 states have (on average 5.784313725490196) internal successors, (295), 51 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 17:31:13,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:13,771 INFO L93 Difference]: Finished difference Result 18635 states and 23382 transitions. [2021-11-23 17:31:13,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 17:31:13,772 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 5.784313725490196) internal successors, (295), 51 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 114 [2021-11-23 17:31:13,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:13,787 INFO L225 Difference]: With dead ends: 18635 [2021-11-23 17:31:13,787 INFO L226 Difference]: Without dead ends: 14710 [2021-11-23 17:31:13,793 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 681 GetRequests, 629 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 925 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=237, Invalid=2519, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 17:31:13,794 INFO L933 BasicCegarLoop]: 1578 mSDtfsCounter, 5911 mSDsluCounter, 34442 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5911 SdHoareTripleChecker+Valid, 36020 SdHoareTripleChecker+Invalid, 526 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 329 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:13,794 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5911 Valid, 36020 Invalid, 526 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 191 Invalid, 0 Unknown, 329 Unchecked, 0.3s Time] [2021-11-23 17:31:13,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14710 states. [2021-11-23 17:31:15,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14710 to 14511. [2021-11-23 17:31:15,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14511 states, 14509 states have (on average 1.2560479702253773) internal successors, (18224), 14510 states have internal predecessors, (18224), 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 17:31:15,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14511 states to 14511 states and 18224 transitions. [2021-11-23 17:31:15,539 INFO L78 Accepts]: Start accepts. Automaton has 14511 states and 18224 transitions. Word has length 114 [2021-11-23 17:31:15,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:15,540 INFO L470 AbstractCegarLoop]: Abstraction has 14511 states and 18224 transitions. [2021-11-23 17:31:15,540 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 5.784313725490196) internal successors, (295), 51 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 17:31:15,540 INFO L276 IsEmpty]: Start isEmpty. Operand 14511 states and 18224 transitions. [2021-11-23 17:31:15,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 17:31:15,543 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:15,543 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 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 17:31:15,567 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (110)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:15,758 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (111)] Ended with exit code 0 [2021-11-23 17:31:15,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:16,157 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:16,158 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:16,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:16,158 INFO L85 PathProgramCache]: Analyzing trace with hash 807167624, now seen corresponding path program 1 times [2021-11-23 17:31:16,158 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:16,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [184865904] [2021-11-23 17:31:16,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:16,159 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:16,159 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:16,159 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:16,160 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (113)] Waiting until timeout for monitored process [2021-11-23 17:31:16,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:16,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:31:16,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:20,862 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 31 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:20,862 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:22,240 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 31 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:22,241 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:22,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [184865904] [2021-11-23 17:31:22,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [184865904] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:22,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [148685540] [2021-11-23 17:31:22,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:22,241 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:22,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:22,242 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:22,243 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (114)] Waiting until timeout for monitored process [2021-11-23 17:31:22,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:22,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:31:22,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:26,883 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 31 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:26,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:30,478 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:30,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [148685540] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:30,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1311977890] [2021-11-23 17:31:30,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:30,479 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:30,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:30,480 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:30,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2021-11-23 17:31:30,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:30,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:31:30,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:40,282 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:40,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:43,072 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:43,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1311977890] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:43,072 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:43,073 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 17, 21, 22, 24, 18] total 98 [2021-11-23 17:31:43,073 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038695717] [2021-11-23 17:31:43,073 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:43,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-11-23 17:31:43,074 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:43,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-11-23 17:31:43,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=704, Invalid=8802, Unknown=0, NotChecked=0, Total=9506 [2021-11-23 17:31:43,075 INFO L87 Difference]: Start difference. First operand 14511 states and 18224 transitions. Second operand has 98 states, 98 states have (on average 5.336734693877551) internal successors, (523), 98 states have internal predecessors, (523), 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 17:31:51,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:51,351 INFO L93 Difference]: Finished difference Result 21195 states and 26521 transitions. [2021-11-23 17:31:51,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:31:51,352 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 5.336734693877551) internal successors, (523), 98 states have internal predecessors, (523), 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 114 [2021-11-23 17:31:51,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:51,370 INFO L225 Difference]: With dead ends: 21195 [2021-11-23 17:31:51,371 INFO L226 Difference]: Without dead ends: 16992 [2021-11-23 17:31:51,378 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 710 GetRequests, 591 SyntacticMatches, 4 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4885 ImplicationChecksByTransitivity, 18.6s TimeCoverageRelationStatistics Valid=1062, Invalid=12510, Unknown=0, NotChecked=0, Total=13572 [2021-11-23 17:31:51,378 INFO L933 BasicCegarLoop]: 1596 mSDtfsCounter, 19073 mSDsluCounter, 49810 mSDsCounter, 0 mSdLazyCounter, 698 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19073 SdHoareTripleChecker+Valid, 51406 SdHoareTripleChecker+Invalid, 1245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 698 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 530 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:51,379 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19073 Valid, 51406 Invalid, 1245 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [17 Valid, 698 Invalid, 0 Unknown, 530 Unchecked, 1.2s Time] [2021-11-23 17:31:51,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16992 states. [2021-11-23 17:31:53,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16992 to 14460. [2021-11-23 17:31:53,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14460 states, 14458 states have (on average 1.256467007884908) internal successors, (18166), 14459 states have internal predecessors, (18166), 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 17:31:53,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14460 states to 14460 states and 18166 transitions. [2021-11-23 17:31:53,289 INFO L78 Accepts]: Start accepts. Automaton has 14460 states and 18166 transitions. Word has length 114 [2021-11-23 17:31:53,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:53,289 INFO L470 AbstractCegarLoop]: Abstraction has 14460 states and 18166 transitions. [2021-11-23 17:31:53,289 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 5.336734693877551) internal successors, (523), 98 states have internal predecessors, (523), 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 17:31:53,290 INFO L276 IsEmpty]: Start isEmpty. Operand 14460 states and 18166 transitions. [2021-11-23 17:31:53,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 17:31:53,291 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:53,292 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 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 17:31:53,293 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (114)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:53,501 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (113)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:53,717 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:53,892 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:53,893 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:53,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:53,893 INFO L85 PathProgramCache]: Analyzing trace with hash -1367712530, now seen corresponding path program 1 times [2021-11-23 17:31:53,893 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:53,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1052500990] [2021-11-23 17:31:53,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:53,893 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:53,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:53,894 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:53,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (116)] Waiting until timeout for monitored process [2021-11-23 17:31:53,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:53,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:31:53,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:54,595 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 31 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:54,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:55,088 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 31 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:55,088 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:55,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1052500990] [2021-11-23 17:31:55,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1052500990] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:55,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [239300391] [2021-11-23 17:31:55,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:55,089 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:55,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:55,090 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:55,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (117)] Waiting until timeout for monitored process [2021-11-23 17:31:55,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:55,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:31:55,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:59,112 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 27 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:59,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:00,120 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 44 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:00,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [239300391] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:00,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1267089088] [2021-11-23 17:32:00,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:00,121 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:00,121 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:00,124 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:00,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_018dd112-5f46-4d5a-a7fe-b0acaba2ad85/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Waiting until timeout for monitored process [2021-11-23 17:32:00,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:00,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:32:00,207 INFO L286 TraceCheckSpWp]: Computing forward predicates...