./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem15_label38.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_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/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_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem15_label38.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/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_dedf633e-5da6-4680-b939-bf5f478eeabd/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 30591791300521640fbd37a0a7b1d6b8314227143a2e8306b493af7e281cc2b1 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:45:54,386 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:45:54,388 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:45:54,433 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:45:54,434 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:45:54,437 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:45:54,439 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:45:54,443 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:45:54,445 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:45:54,451 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:45:54,452 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:45:54,454 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:45:54,454 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:45:54,457 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:45:54,460 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:45:54,467 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:45:54,469 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:45:54,470 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:45:54,472 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:45:54,481 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:45:54,482 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:45:54,484 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:45:54,485 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:45:54,486 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:45:54,489 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:45:54,489 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:45:54,490 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:45:54,491 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:45:54,491 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:45:54,492 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:45:54,492 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:45:54,493 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:45:54,494 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:45:54,495 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:45:54,496 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:45:54,496 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:45:54,497 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:45:54,497 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:45:54,497 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:45:54,498 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:45:54,499 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:45:54,499 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 16:45:54,524 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:45:54,525 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:45:54,525 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:45:54,525 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:45:54,526 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:45:54,526 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:45:54,526 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:45:54,526 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:45:54,526 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:45:54,526 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 16:45:54,527 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:45:54,527 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:45:54,527 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 16:45:54,527 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 16:45:54,527 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:45:54,527 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 16:45:54,528 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 16:45:54,528 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 16:45:54,528 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:45:54,529 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:45:54,529 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 16:45:54,529 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:45:54,529 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:45:54,529 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:45:54,529 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:45:54,530 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:45:54,530 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:45:54,530 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:45:54,530 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:45:54,530 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:45:54,531 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:45:54,531 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:45:54,531 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:45:54,531 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:45:54,531 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:45:54,531 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:45:54,532 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 16:45:54,532 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 16:45:54,532 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:45:54,532 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:45:54,532 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:45:54,533 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_dedf633e-5da6-4680-b939-bf5f478eeabd/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 30591791300521640fbd37a0a7b1d6b8314227143a2e8306b493af7e281cc2b1 [2021-11-23 16:45:54,807 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:45:54,826 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:45:54,829 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:45:54,830 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:45:54,831 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:45:54,832 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/eca-rers2012/Problem15_label38.c [2021-11-23 16:45:54,913 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/data/2689e63c7/d03e44d7e47a48c98298be04acb9c293/FLAG43818dcbc [2021-11-23 16:45:55,574 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:45:55,574 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/sv-benchmarks/c/eca-rers2012/Problem15_label38.c [2021-11-23 16:45:55,602 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/data/2689e63c7/d03e44d7e47a48c98298be04acb9c293/FLAG43818dcbc [2021-11-23 16:45:55,740 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/data/2689e63c7/d03e44d7e47a48c98298be04acb9c293 [2021-11-23 16:45:55,744 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:45:55,746 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:45:55,749 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:45:55,750 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:45:55,753 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:45:55,755 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:45:55" (1/1) ... [2021-11-23 16:45:55,757 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6a7fe0f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:45:55, skipping insertion in model container [2021-11-23 16:45:55,757 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:45:55" (1/1) ... [2021-11-23 16:45:55,767 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:45:55,861 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:45:56,191 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_dedf633e-5da6-4680-b939-bf5f478eeabd/sv-benchmarks/c/eca-rers2012/Problem15_label38.c[3800,3813] [2021-11-23 16:45:56,731 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:45:56,739 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:45:56,759 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_dedf633e-5da6-4680-b939-bf5f478eeabd/sv-benchmarks/c/eca-rers2012/Problem15_label38.c[3800,3813] [2021-11-23 16:45:57,002 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:45:57,018 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:45:57,019 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:45:57 WrapperNode [2021-11-23 16:45:57,019 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:45:57,020 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:45:57,021 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:45:57,021 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:45:57,028 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:45:57" (1/1) ... [2021-11-23 16:45:57,061 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:45:57" (1/1) ... [2021-11-23 16:45:57,282 INFO L137 Inliner]: procedures = 15, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 1758 [2021-11-23 16:45:57,283 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:45:57,284 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:45:57,284 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:45:57,284 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:45:57,292 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:45:57" (1/1) ... [2021-11-23 16:45:57,293 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:45:57" (1/1) ... [2021-11-23 16:45:57,323 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:45:57" (1/1) ... [2021-11-23 16:45:57,323 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:45:57" (1/1) ... [2021-11-23 16:45:57,403 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:45:57" (1/1) ... [2021-11-23 16:45:57,424 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:45:57" (1/1) ... [2021-11-23 16:45:57,454 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:45:57" (1/1) ... [2021-11-23 16:45:57,558 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:45:57,559 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:45:57,559 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:45:57,560 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:45:57,561 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:45:57" (1/1) ... [2021-11-23 16:45:57,571 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:45:57,583 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:45:57,598 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:45:57,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:45:57,643 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:45:57,644 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 16:45:57,644 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:45:57,644 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:45:57,703 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:45:57,705 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:46:00,655 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:46:00,737 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 16:46:00,748 INFO L158 Benchmark]: Toolchain (without parser) took 4999.43ms. Allocated memory was 94.4MB in the beginning and 388.0MB in the end (delta: 293.6MB). Free memory was 68.5MB in the beginning and 310.7MB in the end (delta: -242.3MB). Peak memory consumption was 117.9MB. Max. memory is 16.1GB. [2021-11-23 16:46:00,748 INFO L158 Benchmark]: CDTParser took 0.26ms. Allocated memory is still 94.4MB. Free memory is still 71.7MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 16:46:00,750 INFO L158 Benchmark]: CACSL2BoogieTranslator took 1270.16ms. Allocated memory was 94.4MB in the beginning and 115.3MB in the end (delta: 21.0MB). Free memory was 68.5MB in the beginning and 76.9MB in the end (delta: -8.4MB). Peak memory consumption was 43.5MB. Max. memory is 16.1GB. [2021-11-23 16:46:00,752 INFO L158 Benchmark]: Boogie Procedure Inliner took 262.76ms. Allocated memory is still 115.3MB. Free memory was 76.9MB in the beginning and 57.8MB in the end (delta: 19.1MB). Peak memory consumption was 46.7MB. Max. memory is 16.1GB. [2021-11-23 16:46:00,753 INFO L158 Benchmark]: Boogie Preprocessor took 274.63ms. Allocated memory was 115.3MB in the beginning and 203.4MB in the end (delta: 88.1MB). Free memory was 57.8MB in the beginning and 138.4MB in the end (delta: -80.6MB). Peak memory consumption was 34.7MB. Max. memory is 16.1GB. [2021-11-23 16:46:00,754 INFO L158 Benchmark]: RCFGBuilder took 3185.71ms. Allocated memory was 203.4MB in the beginning and 388.0MB in the end (delta: 184.5MB). Free memory was 138.4MB in the beginning and 310.7MB in the end (delta: -172.3MB). Peak memory consumption was 79.0MB. Max. memory is 16.1GB. [2021-11-23 16:46:00,764 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26ms. Allocated memory is still 94.4MB. Free memory is still 71.7MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 1270.16ms. Allocated memory was 94.4MB in the beginning and 115.3MB in the end (delta: 21.0MB). Free memory was 68.5MB in the beginning and 76.9MB in the end (delta: -8.4MB). Peak memory consumption was 43.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 262.76ms. Allocated memory is still 115.3MB. Free memory was 76.9MB in the beginning and 57.8MB in the end (delta: 19.1MB). Peak memory consumption was 46.7MB. Max. memory is 16.1GB. * Boogie Preprocessor took 274.63ms. Allocated memory was 115.3MB in the beginning and 203.4MB in the end (delta: 88.1MB). Free memory was 57.8MB in the beginning and 138.4MB in the end (delta: -80.6MB). Peak memory consumption was 34.7MB. Max. memory is 16.1GB. * RCFGBuilder took 3185.71ms. Allocated memory was 203.4MB in the beginning and 388.0MB in the end (delta: 184.5MB). Free memory was 138.4MB in the beginning and 310.7MB in the end (delta: -172.3MB). Peak memory consumption was 79.0MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 16:46:00,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/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_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/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_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem15_label38.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/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_dedf633e-5da6-4680-b939-bf5f478eeabd/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 30591791300521640fbd37a0a7b1d6b8314227143a2e8306b493af7e281cc2b1 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:46:03,287 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:46:03,291 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:46:03,353 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:46:03,353 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:46:03,358 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:46:03,360 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:46:03,364 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:46:03,367 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:46:03,375 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:46:03,376 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:46:03,378 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:46:03,379 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:46:03,381 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:46:03,384 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:46:03,388 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:46:03,390 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:46:03,391 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:46:03,393 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:46:03,398 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:46:03,402 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:46:03,404 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:46:03,407 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:46:03,409 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:46:03,418 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:46:03,419 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:46:03,419 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:46:03,421 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:46:03,422 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:46:03,423 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:46:03,423 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:46:03,424 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:46:03,426 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:46:03,427 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:46:03,429 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:46:03,429 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:46:03,430 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:46:03,430 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:46:03,431 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:46:03,432 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:46:03,433 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:46:03,434 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 16:46:03,478 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:46:03,478 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:46:03,479 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:46:03,479 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:46:03,481 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:46:03,481 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:46:03,481 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:46:03,481 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:46:03,482 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:46:03,482 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:46:03,483 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:46:03,483 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:46:03,485 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:46:03,485 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:46:03,485 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:46:03,486 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:46:03,486 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:46:03,486 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:46:03,486 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:46:03,486 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 16:46:03,487 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 16:46:03,487 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 16:46:03,487 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:46:03,487 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:46:03,488 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:46:03,488 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:46:03,488 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:46:03,488 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 16:46:03,489 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:46:03,489 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:46:03,489 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:46:03,489 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:46:03,490 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:46:03,490 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 16:46:03,491 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 16:46:03,491 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:46:03,491 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:46:03,492 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:46:03,492 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_dedf633e-5da6-4680-b939-bf5f478eeabd/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 30591791300521640fbd37a0a7b1d6b8314227143a2e8306b493af7e281cc2b1 [2021-11-23 16:46:03,900 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:46:03,921 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:46:03,924 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:46:03,925 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:46:03,926 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:46:03,927 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/eca-rers2012/Problem15_label38.c [2021-11-23 16:46:04,010 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/data/114329d2b/e0ca2da1b11949b9a2e3aea996b90b4d/FLAGe2890ab6e [2021-11-23 16:46:04,816 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:46:04,816 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/sv-benchmarks/c/eca-rers2012/Problem15_label38.c [2021-11-23 16:46:04,838 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/data/114329d2b/e0ca2da1b11949b9a2e3aea996b90b4d/FLAGe2890ab6e [2021-11-23 16:46:04,942 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/data/114329d2b/e0ca2da1b11949b9a2e3aea996b90b4d [2021-11-23 16:46:04,945 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:46:04,947 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:46:04,955 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:46:04,955 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:46:04,959 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:46:04,960 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:46:04" (1/1) ... [2021-11-23 16:46:04,963 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@557c5b50 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:04, skipping insertion in model container [2021-11-23 16:46:04,963 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:46:04" (1/1) ... [2021-11-23 16:46:04,970 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:46:05,063 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:46:05,394 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_dedf633e-5da6-4680-b939-bf5f478eeabd/sv-benchmarks/c/eca-rers2012/Problem15_label38.c[3800,3813] [2021-11-23 16:46:05,937 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:46:05,948 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:46:05,966 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_dedf633e-5da6-4680-b939-bf5f478eeabd/sv-benchmarks/c/eca-rers2012/Problem15_label38.c[3800,3813] [2021-11-23 16:46:06,228 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:46:06,246 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:46:06,247 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:06 WrapperNode [2021-11-23 16:46:06,247 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:46:06,248 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:46:06,248 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:46:06,249 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:46:06,256 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:06" (1/1) ... [2021-11-23 16:46:06,305 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:06" (1/1) ... [2021-11-23 16:46:06,433 INFO L137 Inliner]: procedures = 15, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 1755 [2021-11-23 16:46:06,433 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:46:06,434 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:46:06,435 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:46:06,435 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:46:06,453 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:06" (1/1) ... [2021-11-23 16:46:06,454 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:06" (1/1) ... [2021-11-23 16:46:06,469 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:06" (1/1) ... [2021-11-23 16:46:06,473 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:06" (1/1) ... [2021-11-23 16:46:06,546 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:06" (1/1) ... [2021-11-23 16:46:06,578 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:06" (1/1) ... [2021-11-23 16:46:06,603 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:06" (1/1) ... [2021-11-23 16:46:06,611 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:46:06,611 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:46:06,612 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:46:06,612 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:46:06,612 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:06" (1/1) ... [2021-11-23 16:46:06,619 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:46:06,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:46:06,641 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:46:06,657 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:46:06,692 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:46:06,692 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 16:46:06,692 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:46:06,692 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:46:06,762 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:46:06,764 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:46:23,818 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:46:23,831 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 16:46:23,832 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 16:46:23,835 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:46:23 BoogieIcfgContainer [2021-11-23 16:46:23,835 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 16:46:23,837 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 16:46:23,837 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 16:46:23,840 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 16:46:23,840 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 04:46:04" (1/3) ... [2021-11-23 16:46:23,841 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72aef299 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:46:23, skipping insertion in model container [2021-11-23 16:46:23,841 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:06" (2/3) ... [2021-11-23 16:46:23,842 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72aef299 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:46:23, skipping insertion in model container [2021-11-23 16:46:23,842 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:46:23" (3/3) ... [2021-11-23 16:46:23,843 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem15_label38.c [2021-11-23 16:46:23,848 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 16:46:23,849 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 16:46:23,900 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 16:46:23,916 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 16:46:23,916 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 16:46:23,948 INFO L276 IsEmpty]: Start isEmpty. Operand has 424 states, 422 states have (on average 1.7772511848341233) internal successors, (750), 423 states have internal predecessors, (750), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:46:23,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 16:46:23,956 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:46:23,957 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:46:23,957 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:46:23,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:46:23,968 INFO L85 PathProgramCache]: Analyzing trace with hash -1722039382, now seen corresponding path program 1 times [2021-11-23 16:46:23,987 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:46:23,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [854029429] [2021-11-23 16:46:23,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:46:23,989 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:46:23,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:46:23,993 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:46:24,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 16:46:24,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:46:24,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:46:24,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:46:24,281 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:24,281 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:46:24,282 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:46:24,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [854029429] [2021-11-23 16:46:24,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [854029429] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:46:24,283 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:46:24,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:46:24,284 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379400785] [2021-11-23 16:46:24,285 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:46:24,289 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:46:24,289 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:46:24,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:46:24,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:46:24,319 INFO L87 Difference]: Start difference. First operand has 424 states, 422 states have (on average 1.7772511848341233) internal successors, (750), 423 states have internal predecessors, (750), 0 states have call successors, (0), 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 3 states, 3 states have (on average 10.0) internal successors, (30), 2 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:46:43,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:46:43,624 INFO L93 Difference]: Finished difference Result 1179 states and 2143 transitions. [2021-11-23 16:46:43,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:46:43,626 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.0) internal successors, (30), 2 states have internal predecessors, (30), 0 states have call successors, (0), 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 30 [2021-11-23 16:46:43,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:46:43,650 INFO L225 Difference]: With dead ends: 1179 [2021-11-23 16:46:43,651 INFO L226 Difference]: Without dead ends: 676 [2021-11-23 16:46:43,657 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:46:43,661 INFO L933 BasicCegarLoop]: 236 mSDtfsCounter, 309 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 1097 mSolverCounterSat, 165 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 309 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 1262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 165 IncrementalHoareTripleChecker+Valid, 1097 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:46:43,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [309 Valid, 277 Invalid, 1262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [165 Valid, 1097 Invalid, 0 Unknown, 0 Unchecked, 19.2s Time] [2021-11-23 16:46:43,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 676 states. [2021-11-23 16:46:43,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 676 to 668. [2021-11-23 16:46:43,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 667 states have (on average 1.5772113943028485) internal successors, (1052), 667 states have internal predecessors, (1052), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:46:43,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 1052 transitions. [2021-11-23 16:46:43,762 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 1052 transitions. Word has length 30 [2021-11-23 16:46:43,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:46:43,762 INFO L470 AbstractCegarLoop]: Abstraction has 668 states and 1052 transitions. [2021-11-23 16:46:43,763 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.0) internal successors, (30), 2 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:46:43,763 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 1052 transitions. [2021-11-23 16:46:43,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 16:46:43,767 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:46:43,775 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:46:43,792 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 16:46:43,989 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:46:43,989 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:46:43,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:46:43,990 INFO L85 PathProgramCache]: Analyzing trace with hash 1115416254, now seen corresponding path program 1 times [2021-11-23 16:46:43,992 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:46:43,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [612843595] [2021-11-23 16:46:43,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:46:43,993 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:46:43,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:46:43,995 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:46:43,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 16:46:44,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:46:44,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:46:44,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:46:44,495 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:44,496 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:46:44,496 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:46:44,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [612843595] [2021-11-23 16:46:44,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [612843595] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:46:44,497 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:46:44,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:46:44,497 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003863841] [2021-11-23 16:46:44,498 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:46:44,499 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:46:44,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:46:44,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:46:44,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:46:44,501 INFO L87 Difference]: Start difference. First operand 668 states and 1052 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:09,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:09,960 INFO L93 Difference]: Finished difference Result 1630 states and 2635 transitions. [2021-11-23 16:47:09,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:47:09,977 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 0 states have call successors, (0), 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 96 [2021-11-23 16:47:09,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:09,986 INFO L225 Difference]: With dead ends: 1630 [2021-11-23 16:47:09,986 INFO L226 Difference]: Without dead ends: 964 [2021-11-23 16:47:09,989 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:47:09,991 INFO L933 BasicCegarLoop]: 301 mSDtfsCounter, 248 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 953 mSolverCounterSat, 180 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 1133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 180 IncrementalHoareTripleChecker+Valid, 953 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:09,992 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [248 Valid, 347 Invalid, 1133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [180 Valid, 953 Invalid, 0 Unknown, 0 Unchecked, 25.4s Time] [2021-11-23 16:47:09,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 964 states. [2021-11-23 16:47:10,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 964 to 962. [2021-11-23 16:47:10,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 962 states, 961 states have (on average 1.3631633714880333) internal successors, (1310), 961 states have internal predecessors, (1310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:10,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 962 states to 962 states and 1310 transitions. [2021-11-23 16:47:10,043 INFO L78 Accepts]: Start accepts. Automaton has 962 states and 1310 transitions. Word has length 96 [2021-11-23 16:47:10,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:10,044 INFO L470 AbstractCegarLoop]: Abstraction has 962 states and 1310 transitions. [2021-11-23 16:47:10,044 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:10,045 INFO L276 IsEmpty]: Start isEmpty. Operand 962 states and 1310 transitions. [2021-11-23 16:47:10,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 16:47:10,049 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:10,050 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:10,063 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:10,265 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:10,266 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:10,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:10,267 INFO L85 PathProgramCache]: Analyzing trace with hash 55311796, now seen corresponding path program 1 times [2021-11-23 16:47:10,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:10,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [42959275] [2021-11-23 16:47:10,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:10,268 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:10,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:10,271 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:10,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 16:47:10,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:10,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:47:10,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:10,755 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:10,755 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:10,756 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:10,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [42959275] [2021-11-23 16:47:10,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [42959275] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:10,757 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:10,757 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:47:10,757 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367460720] [2021-11-23 16:47:10,758 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:10,758 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:47:10,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:10,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:47:10,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:47:10,760 INFO L87 Difference]: Start difference. First operand 962 states and 1310 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 2 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:33,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:33,573 INFO L93 Difference]: Finished difference Result 1928 states and 2831 transitions. [2021-11-23 16:47:33,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:47:33,574 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 2 states have internal predecessors, (100), 0 states have call successors, (0), 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 100 [2021-11-23 16:47:33,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:33,583 INFO L225 Difference]: With dead ends: 1928 [2021-11-23 16:47:33,583 INFO L226 Difference]: Without dead ends: 1267 [2021-11-23 16:47:33,585 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:47:33,587 INFO L933 BasicCegarLoop]: 279 mSDtfsCounter, 256 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 839 mSolverCounterSat, 285 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 1124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 285 IncrementalHoareTripleChecker+Valid, 839 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 22.7s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:33,588 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [256 Valid, 318 Invalid, 1124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [285 Valid, 839 Invalid, 0 Unknown, 0 Unchecked, 22.7s Time] [2021-11-23 16:47:33,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1267 states. [2021-11-23 16:47:33,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1267 to 1265. [2021-11-23 16:47:33,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1265 states, 1264 states have (on average 1.3045886075949367) internal successors, (1649), 1264 states have internal predecessors, (1649), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:33,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1265 states to 1265 states and 1649 transitions. [2021-11-23 16:47:33,622 INFO L78 Accepts]: Start accepts. Automaton has 1265 states and 1649 transitions. Word has length 100 [2021-11-23 16:47:33,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:33,623 INFO L470 AbstractCegarLoop]: Abstraction has 1265 states and 1649 transitions. [2021-11-23 16:47:33,623 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 2 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:33,623 INFO L276 IsEmpty]: Start isEmpty. Operand 1265 states and 1649 transitions. [2021-11-23 16:47:33,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2021-11-23 16:47:33,631 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:33,631 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:33,642 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Ended with exit code 0 [2021-11-23 16:47:33,842 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:33,842 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:33,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:33,843 INFO L85 PathProgramCache]: Analyzing trace with hash 437312665, now seen corresponding path program 1 times [2021-11-23 16:47:33,845 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:33,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [543792163] [2021-11-23 16:47:33,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:33,846 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:33,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:33,848 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:33,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 16:47:33,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:34,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:47:34,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:37,075 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 97 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:37,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:40,172 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 97 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:40,172 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:40,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [543792163] [2021-11-23 16:47:40,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [543792163] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:40,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [847572293] [2021-11-23 16:47:40,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:40,173 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:40,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:40,181 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:40,185 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (6)] Waiting until timeout for monitored process [2021-11-23 16:47:40,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:40,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:47:40,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:42,750 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 121 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 16:47:42,750 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:42,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [847572293] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:42,751 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:47:42,751 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3] total 11 [2021-11-23 16:47:42,752 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490896654] [2021-11-23 16:47:42,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:42,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 16:47:42,753 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:42,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 16:47:42,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=66, Unknown=0, NotChecked=0, Total=110 [2021-11-23 16:47:42,755 INFO L87 Difference]: Start difference. First operand 1265 states and 1649 transitions. Second operand has 7 states, 7 states have (on average 27.0) internal successors, (189), 7 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:52,924 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:47:59,102 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.83s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:16,224 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:31,973 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:33,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:33,397 INFO L93 Difference]: Finished difference Result 2633 states and 3623 transitions. [2021-11-23 16:48:33,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:48:33,415 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 27.0) internal successors, (189), 7 states have internal predecessors, (189), 0 states have call successors, (0), 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 196 [2021-11-23 16:48:33,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:33,428 INFO L225 Difference]: With dead ends: 2633 [2021-11-23 16:48:33,428 INFO L226 Difference]: Without dead ends: 1970 [2021-11-23 16:48:33,430 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 585 GetRequests, 576 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=44, Invalid=66, Unknown=0, NotChecked=0, Total=110 [2021-11-23 16:48:33,431 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 1984 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 1489 mSolverCounterSat, 1216 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 45.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1984 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 2706 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1216 IncrementalHoareTripleChecker+Valid, 1489 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 50.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:33,432 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1984 Valid, 107 Invalid, 2706 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1216 Valid, 1489 Invalid, 1 Unknown, 0 Unchecked, 50.5s Time] [2021-11-23 16:48:33,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1970 states. [2021-11-23 16:48:33,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1970 to 1870. [2021-11-23 16:48:33,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1870 states, 1869 states have (on average 1.3242375601926164) internal successors, (2475), 1869 states have internal predecessors, (2475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:33,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1870 states to 1870 states and 2475 transitions. [2021-11-23 16:48:33,481 INFO L78 Accepts]: Start accepts. Automaton has 1870 states and 2475 transitions. Word has length 196 [2021-11-23 16:48:33,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:33,482 INFO L470 AbstractCegarLoop]: Abstraction has 1870 states and 2475 transitions. [2021-11-23 16:48:33,483 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 27.0) internal successors, (189), 7 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:33,483 INFO L276 IsEmpty]: Start isEmpty. Operand 1870 states and 2475 transitions. [2021-11-23 16:48:33,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2021-11-23 16:48:33,487 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:33,487 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:33,509 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:33,709 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (6)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:33,905 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:33,905 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:33,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:33,906 INFO L85 PathProgramCache]: Analyzing trace with hash 1410937551, now seen corresponding path program 1 times [2021-11-23 16:48:33,907 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:33,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1978478724] [2021-11-23 16:48:33,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:33,907 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:33,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:33,908 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:33,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 16:48:34,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:34,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:48:34,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:36,513 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 101 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:36,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:38,934 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 101 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:38,935 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:38,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1978478724] [2021-11-23 16:48:38,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1978478724] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:38,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1123473309] [2021-11-23 16:48:38,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:38,936 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:38,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:38,941 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:38,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (8)] Waiting until timeout for monitored process [2021-11-23 16:48:39,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:39,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:48:39,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:39,556 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 133 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:39,556 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:48:39,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1123473309] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:48:39,556 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:48:39,557 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-23 16:48:39,557 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896629009] [2021-11-23 16:48:39,557 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:48:39,558 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:48:39,558 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:39,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:48:39,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:48:39,559 INFO L87 Difference]: Start difference. First operand 1870 states and 2475 transitions. Second operand has 3 states, 3 states have (on average 66.66666666666667) internal successors, (200), 3 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:58,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:58,409 INFO L93 Difference]: Finished difference Result 3736 states and 5168 transitions. [2021-11-23 16:48:58,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:48:58,414 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 66.66666666666667) internal successors, (200), 3 states have internal predecessors, (200), 0 states have call successors, (0), 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 200 [2021-11-23 16:48:58,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:58,428 INFO L225 Difference]: With dead ends: 3736 [2021-11-23 16:48:58,429 INFO L226 Difference]: Without dead ends: 2468 [2021-11-23 16:48:58,431 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 597 GetRequests, 592 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 16:48:58,432 INFO L933 BasicCegarLoop]: 268 mSDtfsCounter, 269 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 744 mSolverCounterSat, 344 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 269 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 1088 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 344 IncrementalHoareTripleChecker+Valid, 744 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.8s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:58,433 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [269 Valid, 333 Invalid, 1088 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [344 Valid, 744 Invalid, 0 Unknown, 0 Unchecked, 18.8s Time] [2021-11-23 16:48:58,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2468 states. [2021-11-23 16:48:58,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2468 to 2468. [2021-11-23 16:48:58,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2468 states, 2467 states have (on average 1.272800972841508) internal successors, (3140), 2467 states have internal predecessors, (3140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:58,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2468 states to 2468 states and 3140 transitions. [2021-11-23 16:48:58,505 INFO L78 Accepts]: Start accepts. Automaton has 2468 states and 3140 transitions. Word has length 200 [2021-11-23 16:48:58,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:58,506 INFO L470 AbstractCegarLoop]: Abstraction has 2468 states and 3140 transitions. [2021-11-23 16:48:58,507 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 66.66666666666667) internal successors, (200), 3 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:58,507 INFO L276 IsEmpty]: Start isEmpty. Operand 2468 states and 3140 transitions. [2021-11-23 16:48:58,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 318 [2021-11-23 16:48:58,512 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:58,513 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:58,534 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:58,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (8)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:58,934 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:58,934 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:58,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:58,935 INFO L85 PathProgramCache]: Analyzing trace with hash 11960550, now seen corresponding path program 1 times [2021-11-23 16:48:58,937 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:58,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1916507259] [2021-11-23 16:48:58,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:58,937 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:58,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:58,938 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:58,945 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 16:48:59,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:59,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:48:59,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:01,684 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 113 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:01,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:04,275 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 113 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:04,276 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:04,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1916507259] [2021-11-23 16:49:04,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1916507259] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:04,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [841471212] [2021-11-23 16:49:04,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:04,277 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:04,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:04,278 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:04,279 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-11-23 16:49:04,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:04,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:49:04,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:05,200 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 16:49:05,200 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:49:05,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [841471212] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:49:05,203 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:49:05,204 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3] total 8 [2021-11-23 16:49:05,204 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836912149] [2021-11-23 16:49:05,204 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:49:05,205 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:49:05,205 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:05,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:49:05,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:49:05,206 INFO L87 Difference]: Start difference. First operand 2468 states and 3140 transitions. Second operand has 4 states, 4 states have (on average 57.0) internal successors, (228), 4 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:55,367 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.46s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:16,100 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.93s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:24,700 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.81s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:25,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:25,134 INFO L93 Difference]: Finished difference Result 7676 states and 10113 transitions. [2021-11-23 16:50:25,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:50:25,154 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 57.0) internal successors, (228), 4 states have internal predecessors, (228), 0 states have call successors, (0), 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 317 [2021-11-23 16:50:25,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:25,184 INFO L225 Difference]: With dead ends: 7676 [2021-11-23 16:50:25,185 INFO L226 Difference]: Without dead ends: 5509 [2021-11-23 16:50:25,188 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 950 GetRequests, 943 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-23 16:50:25,189 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 664 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 1733 mSolverCounterSat, 789 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 73.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 664 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 2522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 789 IncrementalHoareTripleChecker+Valid, 1733 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 79.8s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:25,190 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [664 Valid, 115 Invalid, 2522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [789 Valid, 1733 Invalid, 0 Unknown, 0 Unchecked, 79.8s Time] [2021-11-23 16:50:25,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5509 states. [2021-11-23 16:50:25,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5509 to 3368. [2021-11-23 16:50:25,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3368 states, 3367 states have (on average 1.297000297000297) internal successors, (4367), 3367 states have internal predecessors, (4367), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:25,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3368 states to 3368 states and 4367 transitions. [2021-11-23 16:50:25,282 INFO L78 Accepts]: Start accepts. Automaton has 3368 states and 4367 transitions. Word has length 317 [2021-11-23 16:50:25,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:25,283 INFO L470 AbstractCegarLoop]: Abstraction has 3368 states and 4367 transitions. [2021-11-23 16:50:25,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 57.0) internal successors, (228), 4 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:25,284 INFO L276 IsEmpty]: Start isEmpty. Operand 3368 states and 4367 transitions. [2021-11-23 16:50:25,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 472 [2021-11-23 16:50:25,295 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:25,296 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:50:25,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:25,506 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:25,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:25,698 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:25,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:25,699 INFO L85 PathProgramCache]: Analyzing trace with hash 604186032, now seen corresponding path program 1 times [2021-11-23 16:50:25,701 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:25,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1980934821] [2021-11-23 16:50:25,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:25,702 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:25,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:25,702 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:25,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 16:50:25,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:25,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:50:25,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:26,788 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 298 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:50:26,788 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:26,789 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:26,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1980934821] [2021-11-23 16:50:26,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1980934821] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:26,789 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:26,789 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:50:26,789 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923382652] [2021-11-23 16:50:26,789 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:26,790 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:50:26,790 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:26,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:50:26,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:50:26,791 INFO L87 Difference]: Start difference. First operand 3368 states and 4367 transitions. Second operand has 3 states, 3 states have (on average 148.0) internal successors, (444), 3 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:50,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:50,371 INFO L93 Difference]: Finished difference Result 7935 states and 10461 transitions. [2021-11-23 16:50:50,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:50:50,386 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 148.0) internal successors, (444), 3 states have internal predecessors, (444), 0 states have call successors, (0), 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 471 [2021-11-23 16:50:50,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:50,408 INFO L225 Difference]: With dead ends: 7935 [2021-11-23 16:50:50,409 INFO L226 Difference]: Without dead ends: 4569 [2021-11-23 16:50:50,413 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 469 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:50:50,414 INFO L933 BasicCegarLoop]: 591 mSDtfsCounter, 251 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 924 mSolverCounterSat, 217 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 251 SdHoareTripleChecker+Valid, 629 SdHoareTripleChecker+Invalid, 1141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 217 IncrementalHoareTripleChecker+Valid, 924 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:50,415 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [251 Valid, 629 Invalid, 1141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [217 Valid, 924 Invalid, 0 Unknown, 0 Unchecked, 23.5s Time] [2021-11-23 16:50:50,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4569 states. [2021-11-23 16:50:50,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4569 to 4266. [2021-11-23 16:50:50,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4266 states, 4265 states have (on average 1.264712778429074) internal successors, (5394), 4265 states have internal predecessors, (5394), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:50,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4266 states to 4266 states and 5394 transitions. [2021-11-23 16:50:50,528 INFO L78 Accepts]: Start accepts. Automaton has 4266 states and 5394 transitions. Word has length 471 [2021-11-23 16:50:50,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:50,529 INFO L470 AbstractCegarLoop]: Abstraction has 4266 states and 5394 transitions. [2021-11-23 16:50:50,530 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 148.0) internal successors, (444), 3 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:50,530 INFO L276 IsEmpty]: Start isEmpty. Operand 4266 states and 5394 transitions. [2021-11-23 16:50:50,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 495 [2021-11-23 16:50:50,544 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:50,544 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:50:50,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:50,758 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:50,758 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:50,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:50,759 INFO L85 PathProgramCache]: Analyzing trace with hash 1336411518, now seen corresponding path program 1 times [2021-11-23 16:50:50,761 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:50,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [819127733] [2021-11-23 16:50:50,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:50,762 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:50,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:50,762 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:50,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 16:50:50,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:51,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 552 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:50:51,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:53,271 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 293 proven. 0 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2021-11-23 16:50:53,272 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:53,272 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:53,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [819127733] [2021-11-23 16:50:53,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [819127733] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:53,272 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:53,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:50:53,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011844335] [2021-11-23 16:50:53,273 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:53,273 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:50:53,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:53,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:50:53,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:50:53,274 INFO L87 Difference]: Start difference. First operand 4266 states and 5394 transitions. Second operand has 3 states, 3 states have (on average 120.33333333333333) internal successors, (361), 2 states have internal predecessors, (361), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:10,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:10,405 INFO L93 Difference]: Finished difference Result 8829 states and 11097 transitions. [2021-11-23 16:51:10,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:51:10,424 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 120.33333333333333) internal successors, (361), 2 states have internal predecessors, (361), 0 states have call successors, (0), 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 494 [2021-11-23 16:51:10,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:10,444 INFO L225 Difference]: With dead ends: 8829 [2021-11-23 16:51:10,444 INFO L226 Difference]: Without dead ends: 4565 [2021-11-23 16:51:10,448 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 492 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:10,449 INFO L933 BasicCegarLoop]: 318 mSDtfsCounter, 105 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 882 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 887 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 882 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:10,449 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 353 Invalid, 887 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 882 Invalid, 0 Unknown, 0 Unchecked, 17.1s Time] [2021-11-23 16:51:10,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4565 states. [2021-11-23 16:51:10,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4565 to 4565. [2021-11-23 16:51:10,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4565 states, 4564 states have (on average 1.2486853637160387) internal successors, (5699), 4564 states have internal predecessors, (5699), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:10,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4565 states to 4565 states and 5699 transitions. [2021-11-23 16:51:10,556 INFO L78 Accepts]: Start accepts. Automaton has 4565 states and 5699 transitions. Word has length 494 [2021-11-23 16:51:10,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:10,556 INFO L470 AbstractCegarLoop]: Abstraction has 4565 states and 5699 transitions. [2021-11-23 16:51:10,557 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 120.33333333333333) internal successors, (361), 2 states have internal predecessors, (361), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:10,557 INFO L276 IsEmpty]: Start isEmpty. Operand 4565 states and 5699 transitions. [2021-11-23 16:51:10,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 569 [2021-11-23 16:51:10,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:10,565 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:10,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:10,779 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:10,779 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:10,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:10,779 INFO L85 PathProgramCache]: Analyzing trace with hash -1821287600, now seen corresponding path program 1 times [2021-11-23 16:51:10,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:10,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [114567776] [2021-11-23 16:51:10,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:10,783 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:10,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:10,783 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:10,786 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 16:51:11,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:11,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 627 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:51:11,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:13,179 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 322 proven. 106 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:51:13,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:25,445 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 322 proven. 106 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:51:25,445 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:25,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [114567776] [2021-11-23 16:51:25,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [114567776] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:25,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1519041451] [2021-11-23 16:51:25,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:25,446 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:25,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:51:25,448 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:51:25,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-23 16:51:25,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:25,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 627 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:51:25,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:26,783 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 83 proven. 0 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2021-11-23 16:51:26,783 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:26,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1519041451] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:26,783 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:51:26,784 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3] total 8 [2021-11-23 16:51:26,784 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015265361] [2021-11-23 16:51:26,784 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:26,785 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:51:26,785 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:26,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:51:26,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:51:26,786 INFO L87 Difference]: Start difference. First operand 4565 states and 5699 transitions. Second operand has 4 states, 4 states have (on average 75.75) internal successors, (303), 4 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:39,142 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.39s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:51:47,283 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.00s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:51:53,435 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.66s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:26,504 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.29s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:34,969 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.68s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:43,270 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.77s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:43,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:43,860 INFO L93 Difference]: Finished difference Result 13053 states and 16535 transitions. [2021-11-23 16:52:43,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:52:43,877 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 75.75) internal successors, (303), 4 states have internal predecessors, (303), 0 states have call successors, (0), 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 568 [2021-11-23 16:52:43,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:43,914 INFO L225 Difference]: With dead ends: 13053 [2021-11-23 16:52:43,914 INFO L226 Difference]: Without dead ends: 8789 [2021-11-23 16:52:43,918 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1703 GetRequests, 1696 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2021-11-23 16:52:43,919 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 642 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 1831 mSolverCounterSat, 707 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 70.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 642 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 2538 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 707 IncrementalHoareTripleChecker+Valid, 1831 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 76.9s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:43,919 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [642 Valid, 114 Invalid, 2538 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [707 Valid, 1831 Invalid, 0 Unknown, 0 Unchecked, 76.9s Time] [2021-11-23 16:52:43,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8789 states. [2021-11-23 16:52:44,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8789 to 5466. [2021-11-23 16:52:44,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5466 states, 5465 states have (on average 1.2252516010978958) internal successors, (6696), 5465 states have internal predecessors, (6696), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:44,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5466 states to 5466 states and 6696 transitions. [2021-11-23 16:52:44,091 INFO L78 Accepts]: Start accepts. Automaton has 5466 states and 6696 transitions. Word has length 568 [2021-11-23 16:52:44,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:44,093 INFO L470 AbstractCegarLoop]: Abstraction has 5466 states and 6696 transitions. [2021-11-23 16:52:44,102 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 75.75) internal successors, (303), 4 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:44,111 INFO L276 IsEmpty]: Start isEmpty. Operand 5466 states and 6696 transitions. [2021-11-23 16:52:44,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 627 [2021-11-23 16:52:44,120 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:44,121 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:44,149 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:44,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:44,538 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:44,538 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:44,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:44,539 INFO L85 PathProgramCache]: Analyzing trace with hash 505803114, now seen corresponding path program 1 times [2021-11-23 16:52:44,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:44,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1246435179] [2021-11-23 16:52:44,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:44,543 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:44,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:44,543 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:44,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 16:52:44,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:44,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 687 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:52:44,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:47,263 INFO L134 CoverageAnalysis]: Checked inductivity of 514 backedges. 380 proven. 106 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:52:47,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:59,392 INFO L134 CoverageAnalysis]: Checked inductivity of 514 backedges. 380 proven. 106 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:52:59,393 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:59,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1246435179] [2021-11-23 16:52:59,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1246435179] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:59,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [9022056] [2021-11-23 16:52:59,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:59,394 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:59,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:59,395 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:59,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 16:53:00,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:00,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 687 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:53:00,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:02,572 INFO L134 CoverageAnalysis]: Checked inductivity of 514 backedges. 380 proven. 106 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:53:02,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:14,804 INFO L134 CoverageAnalysis]: Checked inductivity of 514 backedges. 380 proven. 106 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:53:14,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [9022056] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:14,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [625053695] [2021-11-23 16:53:14,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:14,805 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:14,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:53:14,806 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:53:14,810 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 16:53:15,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:15,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 687 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:53:15,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:17,440 INFO L134 CoverageAnalysis]: Checked inductivity of 514 backedges. 83 proven. 325 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2021-11-23 16:53:17,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:19,697 INFO L134 CoverageAnalysis]: Checked inductivity of 514 backedges. 408 proven. 0 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2021-11-23 16:53:19,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [625053695] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 16:53:19,697 INFO L186 FreeRefinementEngine]: Found 1 perfect and 5 imperfect interpolant sequences. [2021-11-23 16:53:19,698 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 3, 3, 3] total 9 [2021-11-23 16:53:19,698 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711049542] [2021-11-23 16:53:19,699 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:53:19,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:53:19,700 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:19,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:53:19,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 16:53:19,701 INFO L87 Difference]: Start difference. First operand 5466 states and 6696 transitions. Second operand has 3 states, 3 states have (on average 173.66666666666666) internal successors, (521), 3 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 16:53:35,366 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:45,396 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.53s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:50,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:50,379 INFO L93 Difference]: Finished difference Result 14218 states and 17416 transitions. [2021-11-23 16:53:50,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:53:50,396 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 173.66666666666666) internal successors, (521), 3 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 626 [2021-11-23 16:53:50,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:50,413 INFO L225 Difference]: With dead ends: 14218 [2021-11-23 16:53:50,413 INFO L226 Difference]: Without dead ends: 9053 [2021-11-23 16:53:50,417 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3750 GetRequests, 3743 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 16:53:50,418 INFO L933 BasicCegarLoop]: 140 mSDtfsCounter, 158 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 871 mSolverCounterSat, 325 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 26.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 1196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 325 IncrementalHoareTripleChecker+Valid, 871 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 30.6s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:50,418 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 170 Invalid, 1196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [325 Valid, 871 Invalid, 0 Unknown, 0 Unchecked, 30.6s Time] [2021-11-23 16:53:50,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9053 states. [2021-11-23 16:53:50,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9053 to 7558. [2021-11-23 16:53:50,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7558 states, 7557 states have (on average 1.2205901812888713) internal successors, (9224), 7557 states have internal predecessors, (9224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:50,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7558 states to 7558 states and 9224 transitions. [2021-11-23 16:53:50,550 INFO L78 Accepts]: Start accepts. Automaton has 7558 states and 9224 transitions. Word has length 626 [2021-11-23 16:53:50,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:50,551 INFO L470 AbstractCegarLoop]: Abstraction has 7558 states and 9224 transitions. [2021-11-23 16:53:50,551 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 173.66666666666666) internal successors, (521), 3 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 16:53:50,552 INFO L276 IsEmpty]: Start isEmpty. Operand 7558 states and 9224 transitions. [2021-11-23 16:53:50,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 755 [2021-11-23 16:53:50,566 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:50,567 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:50,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:50,785 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:51,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:51,182 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:51,183 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:51,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:51,183 INFO L85 PathProgramCache]: Analyzing trace with hash 451241193, now seen corresponding path program 1 times [2021-11-23 16:53:51,188 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:51,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1578866695] [2021-11-23 16:53:51,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:51,190 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:51,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:51,191 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:51,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 16:53:51,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:51,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 829 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:53:51,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:54,329 INFO L134 CoverageAnalysis]: Checked inductivity of 1284 backedges. 482 proven. 32 refuted. 0 times theorem prover too weak. 770 trivial. 0 not checked. [2021-11-23 16:53:54,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:57,002 INFO L134 CoverageAnalysis]: Checked inductivity of 1284 backedges. 482 proven. 32 refuted. 0 times theorem prover too weak. 770 trivial. 0 not checked. [2021-11-23 16:53:57,002 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:57,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1578866695] [2021-11-23 16:53:57,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1578866695] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:57,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [548825115] [2021-11-23 16:53:57,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:57,003 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:57,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:53:57,004 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:53:57,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-23 16:53:57,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:57,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 829 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:53:57,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:00,535 INFO L134 CoverageAnalysis]: Checked inductivity of 1284 backedges. 902 proven. 82 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2021-11-23 16:54:00,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:03,721 INFO L134 CoverageAnalysis]: Checked inductivity of 1284 backedges. 902 proven. 82 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2021-11-23 16:54:03,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [548825115] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:03,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [499649780] [2021-11-23 16:54:03,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:03,721 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:54:03,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:54:03,722 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:54:03,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 16:54:04,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:04,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 829 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:54:04,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:06,082 INFO L134 CoverageAnalysis]: Checked inductivity of 1284 backedges. 956 proven. 0 refuted. 0 times theorem prover too weak. 328 trivial. 0 not checked. [2021-11-23 16:54:06,082 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:54:06,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [499649780] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:54:06,083 INFO L186 FreeRefinementEngine]: Found 1 perfect and 4 imperfect interpolant sequences. [2021-11-23 16:54:06,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [3, 3, 6, 6] total 14 [2021-11-23 16:54:06,084 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432378698] [2021-11-23 16:54:06,084 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:54:06,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:54:06,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:06,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:54:06,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=114, Unknown=0, NotChecked=0, Total=182 [2021-11-23 16:54:06,087 INFO L87 Difference]: Start difference. First operand 7558 states and 9224 transitions. Second operand has 5 states, 5 states have (on average 103.8) internal successors, (519), 5 states have internal predecessors, (519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:13,418 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:55:31,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:31,395 INFO L93 Difference]: Finished difference Result 20553 states and 24780 transitions. [2021-11-23 16:55:31,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:55:31,415 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 103.8) internal successors, (519), 5 states have internal predecessors, (519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 754 [2021-11-23 16:55:31,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:31,440 INFO L225 Difference]: With dead ends: 20553 [2021-11-23 16:55:31,441 INFO L226 Difference]: Without dead ends: 13296 [2021-11-23 16:55:31,449 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3769 GetRequests, 3755 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:55:31,450 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 1091 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 2688 mSolverCounterSat, 913 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 79.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1091 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 3602 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 913 IncrementalHoareTripleChecker+Valid, 2688 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 85.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:31,450 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1091 Valid, 192 Invalid, 3602 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [913 Valid, 2688 Invalid, 1 Unknown, 0 Unchecked, 85.1s Time] [2021-11-23 16:55:31,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13296 states. [2021-11-23 16:55:31,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13296 to 12939. [2021-11-23 16:55:31,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12939 states, 12938 states have (on average 1.1756067398361416) internal successors, (15210), 12938 states have internal predecessors, (15210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:31,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12939 states to 12939 states and 15210 transitions. [2021-11-23 16:55:31,743 INFO L78 Accepts]: Start accepts. Automaton has 12939 states and 15210 transitions. Word has length 754 [2021-11-23 16:55:31,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:31,744 INFO L470 AbstractCegarLoop]: Abstraction has 12939 states and 15210 transitions. [2021-11-23 16:55:31,745 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 103.8) internal successors, (519), 5 states have internal predecessors, (519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:31,745 INFO L276 IsEmpty]: Start isEmpty. Operand 12939 states and 15210 transitions. [2021-11-23 16:55:31,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 786 [2021-11-23 16:55:31,765 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:31,766 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:31,773 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:31,999 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-11-23 16:55:32,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:32,369 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:55:32,369 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:32,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:32,370 INFO L85 PathProgramCache]: Analyzing trace with hash -120757433, now seen corresponding path program 1 times [2021-11-23 16:55:32,376 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:32,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [402718255] [2021-11-23 16:55:32,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:32,377 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:32,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:32,378 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:32,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 16:55:32,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:32,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 861 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:55:32,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:35,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1359 backedges. 482 proven. 32 refuted. 0 times theorem prover too weak. 845 trivial. 0 not checked. [2021-11-23 16:55:35,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:38,704 INFO L134 CoverageAnalysis]: Checked inductivity of 1359 backedges. 482 proven. 32 refuted. 0 times theorem prover too weak. 845 trivial. 0 not checked. [2021-11-23 16:55:38,704 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:38,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [402718255] [2021-11-23 16:55:38,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [402718255] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:38,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1249547883] [2021-11-23 16:55:38,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:38,705 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:38,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:38,706 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:38,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-23 16:55:39,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:39,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 861 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:55:39,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:40,466 INFO L134 CoverageAnalysis]: Checked inductivity of 1359 backedges. 1031 proven. 0 refuted. 0 times theorem prover too weak. 328 trivial. 0 not checked. [2021-11-23 16:55:40,467 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:55:40,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1249547883] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:55:40,467 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:55:40,468 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-23 16:55:40,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714192411] [2021-11-23 16:55:40,468 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:55:40,469 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:55:40,469 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:40,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:55:40,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:55:40,470 INFO L87 Difference]: Start difference. First operand 12939 states and 15210 transitions. Second operand has 3 states, 3 states have (on average 183.33333333333334) internal successors, (550), 3 states have internal predecessors, (550), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:10,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:56:10,482 INFO L93 Difference]: Finished difference Result 29775 states and 34823 transitions. [2021-11-23 16:56:10,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:56:10,487 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 183.33333333333334) internal successors, (550), 3 states have internal predecessors, (550), 0 states have call successors, (0), 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 785 [2021-11-23 16:56:10,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:56:10,575 INFO L225 Difference]: With dead ends: 29775 [2021-11-23 16:56:10,575 INFO L226 Difference]: Without dead ends: 17137 [2021-11-23 16:56:10,586 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2352 GetRequests, 2347 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:56:10,590 INFO L933 BasicCegarLoop]: 566 mSDtfsCounter, 170 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 1022 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 26.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 596 SdHoareTripleChecker+Invalid, 1138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 1022 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 29.9s IncrementalHoareTripleChecker+Time [2021-11-23 16:56:10,591 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 596 Invalid, 1138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 1022 Invalid, 0 Unknown, 0 Unchecked, 29.9s Time] [2021-11-23 16:56:10,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17137 states. [2021-11-23 16:56:10,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17137 to 17126. [2021-11-23 16:56:10,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17126 states, 17125 states have (on average 1.1456350364963503) internal successors, (19619), 17125 states have internal predecessors, (19619), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:10,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17126 states to 17126 states and 19619 transitions. [2021-11-23 16:56:10,914 INFO L78 Accepts]: Start accepts. Automaton has 17126 states and 19619 transitions. Word has length 785 [2021-11-23 16:56:10,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:56:10,915 INFO L470 AbstractCegarLoop]: Abstraction has 17126 states and 19619 transitions. [2021-11-23 16:56:10,915 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 183.33333333333334) internal successors, (550), 3 states have internal predecessors, (550), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:10,915 INFO L276 IsEmpty]: Start isEmpty. Operand 17126 states and 19619 transitions. [2021-11-23 16:56:11,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 832 [2021-11-23 16:56:11,016 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:56:11,018 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:56:11,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:11,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:11,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:56:11,419 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:56:11,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:56:11,419 INFO L85 PathProgramCache]: Analyzing trace with hash 915058120, now seen corresponding path program 1 times [2021-11-23 16:56:11,424 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:56:11,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2059737255] [2021-11-23 16:56:11,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:11,425 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:56:11,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:56:11,426 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:56:11,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 16:56:11,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:11,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 910 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:56:11,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:15,271 INFO L134 CoverageAnalysis]: Checked inductivity of 1292 backedges. 466 proven. 32 refuted. 0 times theorem prover too weak. 794 trivial. 0 not checked. [2021-11-23 16:56:15,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:18,827 INFO L134 CoverageAnalysis]: Checked inductivity of 1292 backedges. 466 proven. 32 refuted. 0 times theorem prover too weak. 794 trivial. 0 not checked. [2021-11-23 16:56:18,827 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:56:18,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2059737255] [2021-11-23 16:56:18,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2059737255] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:18,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [873449046] [2021-11-23 16:56:18,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:18,828 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:56:18,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:56:18,829 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:56:18,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-23 16:56:19,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:19,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 910 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 16:56:19,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:25,497 INFO L134 CoverageAnalysis]: Checked inductivity of 1292 backedges. 785 proven. 0 refuted. 0 times theorem prover too weak. 507 trivial. 0 not checked. [2021-11-23 16:56:25,497 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:56:25,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [873449046] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:56:25,497 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:56:25,498 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [3, 3] total 10 [2021-11-23 16:56:25,498 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204660112] [2021-11-23 16:56:25,498 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:56:25,499 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:56:25,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:56:25,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:56:25,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-11-23 16:56:25,500 INFO L87 Difference]: Start difference. First operand 17126 states and 19619 transitions. Second operand has 6 states, 6 states have (on average 84.0) internal successors, (504), 6 states have internal predecessors, (504), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:52,367 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:53,572 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.20s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:11,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:11,135 INFO L93 Difference]: Finished difference Result 35374 states and 40757 transitions. [2021-11-23 16:57:11,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:57:11,153 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 84.0) internal successors, (504), 6 states have internal predecessors, (504), 0 states have call successors, (0), 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 831 [2021-11-23 16:57:11,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:11,170 INFO L225 Difference]: With dead ends: 35374 [2021-11-23 16:57:11,171 INFO L226 Difference]: Without dead ends: 18549 [2021-11-23 16:57:11,183 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2490 GetRequests, 2482 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-11-23 16:57:11,184 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 500 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 2860 mSolverCounterSat, 468 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 40.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 500 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 3329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 468 IncrementalHoareTripleChecker+Valid, 2860 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 45.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:11,184 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [500 Valid, 150 Invalid, 3329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [468 Valid, 2860 Invalid, 1 Unknown, 0 Unchecked, 45.4s Time] [2021-11-23 16:57:11,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18549 states. [2021-11-23 16:57:11,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18549 to 18023. [2021-11-23 16:57:11,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18023 states, 18022 states have (on average 1.1230163133947397) internal successors, (20239), 18022 states have internal predecessors, (20239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:11,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18023 states to 18023 states and 20239 transitions. [2021-11-23 16:57:11,444 INFO L78 Accepts]: Start accepts. Automaton has 18023 states and 20239 transitions. Word has length 831 [2021-11-23 16:57:11,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:11,445 INFO L470 AbstractCegarLoop]: Abstraction has 18023 states and 20239 transitions. [2021-11-23 16:57:11,445 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 84.0) internal successors, (504), 6 states have internal predecessors, (504), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:11,445 INFO L276 IsEmpty]: Start isEmpty. Operand 18023 states and 20239 transitions. [2021-11-23 16:57:11,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 834 [2021-11-23 16:57:11,468 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:11,468 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:57:11,492 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:11,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:11,892 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:57:11,893 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:11,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:11,894 INFO L85 PathProgramCache]: Analyzing trace with hash -297760368, now seen corresponding path program 1 times [2021-11-23 16:57:11,900 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:11,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1385069277] [2021-11-23 16:57:11,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:11,900 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:11,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:11,901 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:11,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 16:57:12,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:12,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 910 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:57:12,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:15,774 INFO L134 CoverageAnalysis]: Checked inductivity of 1455 backedges. 482 proven. 32 refuted. 0 times theorem prover too weak. 941 trivial. 0 not checked. [2021-11-23 16:57:15,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:19,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1455 backedges. 482 proven. 32 refuted. 0 times theorem prover too weak. 941 trivial. 0 not checked. [2021-11-23 16:57:19,390 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:57:19,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1385069277] [2021-11-23 16:57:19,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1385069277] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:19,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2123834466] [2021-11-23 16:57:19,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:19,391 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:57:19,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:57:19,392 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:57:19,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-23 16:57:19,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:19,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 910 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:57:19,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:21,214 INFO L134 CoverageAnalysis]: Checked inductivity of 1455 backedges. 705 proven. 0 refuted. 0 times theorem prover too weak. 750 trivial. 0 not checked. [2021-11-23 16:57:21,214 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:57:21,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2123834466] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:57:21,214 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:57:21,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-23 16:57:21,215 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941959779] [2021-11-23 16:57:21,216 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:57:21,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:57:21,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:57:21,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:57:21,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:57:21,218 INFO L87 Difference]: Start difference. First operand 18023 states and 20239 transitions. Second operand has 3 states, 3 states have (on average 131.66666666666666) internal successors, (395), 3 states have internal predecessors, (395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:24,361 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.04s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:49,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:49,116 INFO L93 Difference]: Finished difference Result 42620 states and 47454 transitions. [2021-11-23 16:57:49,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:57:49,130 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 131.66666666666666) internal successors, (395), 3 states have internal predecessors, (395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 833 [2021-11-23 16:57:49,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:49,149 INFO L225 Difference]: With dead ends: 42620 [2021-11-23 16:57:49,149 INFO L226 Difference]: Without dead ends: 21609 [2021-11-23 16:57:49,160 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2496 GetRequests, 2491 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:57:49,161 INFO L933 BasicCegarLoop]: 606 mSDtfsCounter, 123 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 826 mSolverCounterSat, 230 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 644 SdHoareTripleChecker+Invalid, 1056 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 230 IncrementalHoareTripleChecker+Valid, 826 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.7s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:49,161 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 644 Invalid, 1056 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [230 Valid, 826 Invalid, 0 Unknown, 0 Unchecked, 27.7s Time] [2021-11-23 16:57:49,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21609 states. [2021-11-23 16:57:49,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21609 to 18918. [2021-11-23 16:57:49,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18918 states, 18917 states have (on average 1.0727388063646455) internal successors, (20293), 18917 states have internal predecessors, (20293), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:49,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18918 states to 18918 states and 20293 transitions. [2021-11-23 16:57:49,526 INFO L78 Accepts]: Start accepts. Automaton has 18918 states and 20293 transitions. Word has length 833 [2021-11-23 16:57:49,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:49,526 INFO L470 AbstractCegarLoop]: Abstraction has 18918 states and 20293 transitions. [2021-11-23 16:57:49,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 131.66666666666666) internal successors, (395), 3 states have internal predecessors, (395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:49,527 INFO L276 IsEmpty]: Start isEmpty. Operand 18918 states and 20293 transitions. [2021-11-23 16:57:49,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 849 [2021-11-23 16:57:49,548 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:49,548 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:57:49,555 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:49,764 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:49,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:57:49,951 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:49,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:49,952 INFO L85 PathProgramCache]: Analyzing trace with hash -1688857874, now seen corresponding path program 1 times [2021-11-23 16:57:49,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:49,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [11464900] [2021-11-23 16:57:49,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:49,957 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:49,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:49,958 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:49,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 16:57:50,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:50,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 917 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:57:50,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:52,882 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 706 proven. 106 refuted. 0 times theorem prover too weak. 244 trivial. 0 not checked. [2021-11-23 16:57:52,882 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:04,220 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 706 proven. 106 refuted. 0 times theorem prover too weak. 244 trivial. 0 not checked. [2021-11-23 16:58:04,220 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:58:04,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [11464900] [2021-11-23 16:58:04,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [11464900] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:04,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1910704742] [2021-11-23 16:58:04,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:04,221 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:58:04,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:58:04,222 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:58:04,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-23 16:58:04,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:04,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 917 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:58:04,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:05,655 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 565 proven. 0 refuted. 0 times theorem prover too weak. 491 trivial. 0 not checked. [2021-11-23 16:58:05,656 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:58:05,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1910704742] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:58:05,656 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:58:05,657 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-23 16:58:05,657 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097709722] [2021-11-23 16:58:05,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:58:05,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:58:05,658 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:58:05,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:58:05,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:58:05,666 INFO L87 Difference]: Start difference. First operand 18918 states and 20293 transitions. Second operand has 3 states, 3 states have (on average 155.33333333333334) internal successors, (466), 3 states have internal predecessors, (466), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:24,577 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.21s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:58:26,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:58:26,297 INFO L93 Difference]: Finished difference Result 39328 states and 42011 transitions. [2021-11-23 16:58:26,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:58:26,297 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 155.33333333333334) internal successors, (466), 3 states have internal predecessors, (466), 0 states have call successors, (0), 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 848 [2021-11-23 16:58:26,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:58:26,313 INFO L225 Difference]: With dead ends: 39328 [2021-11-23 16:58:26,313 INFO L226 Difference]: Without dead ends: 18618 [2021-11-23 16:58:26,323 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2541 GetRequests, 2536 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:58:26,324 INFO L933 BasicCegarLoop]: 501 mSDtfsCounter, 320 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 786 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 320 SdHoareTripleChecker+Valid, 540 SdHoareTripleChecker+Invalid, 890 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 786 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:58:26,324 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [320 Valid, 540 Invalid, 890 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 786 Invalid, 0 Unknown, 0 Unchecked, 20.5s Time] [2021-11-23 16:58:26,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18618 states. [2021-11-23 16:58:26,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18618 to 17422. [2021-11-23 16:58:26,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17422 states, 17421 states have (on average 1.0583778198725675) internal successors, (18438), 17421 states have internal predecessors, (18438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:26,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17422 states to 17422 states and 18438 transitions. [2021-11-23 16:58:26,687 INFO L78 Accepts]: Start accepts. Automaton has 17422 states and 18438 transitions. Word has length 848 [2021-11-23 16:58:26,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:58:26,688 INFO L470 AbstractCegarLoop]: Abstraction has 17422 states and 18438 transitions. [2021-11-23 16:58:26,688 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 155.33333333333334) internal successors, (466), 3 states have internal predecessors, (466), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:26,688 INFO L276 IsEmpty]: Start isEmpty. Operand 17422 states and 18438 transitions. [2021-11-23 16:58:26,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 898 [2021-11-23 16:58:26,703 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:58:26,703 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:58:26,718 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:26,905 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:27,104 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:58:27,105 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:58:27,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:58:27,105 INFO L85 PathProgramCache]: Analyzing trace with hash -47792994, now seen corresponding path program 1 times [2021-11-23 16:58:27,110 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:58:27,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1268633890] [2021-11-23 16:58:27,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:27,110 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:58:27,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:58:27,111 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:58:27,112 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedf633e-5da6-4680-b939-bf5f478eeabd/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 16:58:27,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:27,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 963 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:58:27,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:41,805 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 720 proven. 246 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-11-23 16:58:41,805 INFO L328 TraceCheckSpWp]: Computing backward predicates...