./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem16_label05.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6a47aea7 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/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_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem16_label05.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/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_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/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 0645d92d946523ae7f73519b10a8044529081b14933ba5ba70a68277fba7b19b --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:05:43,454 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:05:43,456 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:05:43,512 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:05:43,513 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:05:43,515 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:05:43,517 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:05:43,520 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:05:43,522 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:05:43,524 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:05:43,525 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:05:43,527 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:05:43,528 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:05:43,529 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:05:43,531 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:05:43,533 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:05:43,535 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:05:43,536 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:05:43,539 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:05:43,542 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:05:43,545 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:05:43,547 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:05:43,549 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:05:43,550 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:05:43,555 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:05:43,556 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:05:43,556 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:05:43,557 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:05:43,558 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:05:43,560 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:05:43,560 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:05:43,561 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:05:43,563 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:05:43,564 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:05:43,565 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:05:43,566 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:05:43,567 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:05:43,568 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:05:43,568 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:05:43,569 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:05:43,571 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:05:43,576 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:05:43,606 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:05:43,607 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:05:43,607 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:05:43,607 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:05:43,608 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:05:43,609 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:05:43,609 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:05:43,609 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:05:43,610 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:05:43,610 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:05:43,610 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:05:43,610 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:05:43,611 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:05:43,611 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:05:43,611 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:05:43,612 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:05:43,612 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:05:43,612 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:05:43,613 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:05:43,613 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:05:43,614 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:05:43,614 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:05:43,614 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:05:43,614 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:05:43,615 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:05:43,615 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:05:43,615 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:05:43,615 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:05:43,616 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:05:43,616 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:05:43,616 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:05:43,617 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:05:43,617 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:05:43,617 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:05:43,617 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:05:43,618 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:05:43,618 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:05:43,618 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:05:43,618 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:05:43,619 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:05:43,619 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:05:43,619 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_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0645d92d946523ae7f73519b10a8044529081b14933ba5ba70a68277fba7b19b [2021-11-23 17:05:43,893 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:05:43,918 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:05:43,922 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:05:43,923 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:05:43,924 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:05:43,926 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/eca-rers2012/Problem16_label05.c [2021-11-23 17:05:44,045 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/data/3720eca81/c15ddd3ee2384766ab177332ab6a3ee6/FLAG17302baa1 [2021-11-23 17:05:44,934 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:05:44,935 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/sv-benchmarks/c/eca-rers2012/Problem16_label05.c [2021-11-23 17:05:44,960 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/data/3720eca81/c15ddd3ee2384766ab177332ab6a3ee6/FLAG17302baa1 [2021-11-23 17:05:45,038 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/data/3720eca81/c15ddd3ee2384766ab177332ab6a3ee6 [2021-11-23 17:05:45,044 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:05:45,047 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:05:45,051 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:05:45,051 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:05:45,055 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:05:45,056 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:05:45" (1/1) ... [2021-11-23 17:05:45,058 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@367428a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:45, skipping insertion in model container [2021-11-23 17:05:45,059 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:05:45" (1/1) ... [2021-11-23 17:05:45,070 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:05:45,170 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:05:45,483 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_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/sv-benchmarks/c/eca-rers2012/Problem16_label05.c[2198,2211] [2021-11-23 17:05:46,097 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:05:46,107 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:05:46,127 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_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/sv-benchmarks/c/eca-rers2012/Problem16_label05.c[2198,2211] [2021-11-23 17:05:46,376 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:05:46,397 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:05:46,397 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:46 WrapperNode [2021-11-23 17:05:46,398 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:05:46,399 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:05:46,399 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:05:46,399 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:05:46,409 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:46" (1/1) ... [2021-11-23 17:05:46,471 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:46" (1/1) ... [2021-11-23 17:05:46,671 INFO L137 Inliner]: procedures = 15, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 1768 [2021-11-23 17:05:46,672 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:05:46,673 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:05:46,673 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:05:46,673 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:05:46,684 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:46" (1/1) ... [2021-11-23 17:05:46,685 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:46" (1/1) ... [2021-11-23 17:05:46,751 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:46" (1/1) ... [2021-11-23 17:05:46,751 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:46" (1/1) ... [2021-11-23 17:05:46,853 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:46" (1/1) ... [2021-11-23 17:05:46,880 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:46" (1/1) ... [2021-11-23 17:05:46,896 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:46" (1/1) ... [2021-11-23 17:05:46,933 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:05:46,947 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:05:46,947 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:05:46,948 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:05:46,949 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:46" (1/1) ... [2021-11-23 17:05:46,961 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:05:46,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:05:46,985 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:05:46,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:05:47,028 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:05:47,029 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:05:47,029 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:05:47,029 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:05:47,110 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:05:47,112 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:05:50,107 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:05:50,177 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 17:05:50,190 INFO L158 Benchmark]: Toolchain (without parser) took 5139.97ms. Allocated memory was 111.1MB in the beginning and 161.5MB in the end (delta: 50.3MB). Free memory was 77.6MB in the beginning and 101.1MB in the end (delta: -23.4MB). Peak memory consumption was 66.1MB. Max. memory is 16.1GB. [2021-11-23 17:05:50,191 INFO L158 Benchmark]: CDTParser took 0.32ms. Allocated memory is still 79.7MB. Free memory is still 45.0MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:05:50,193 INFO L158 Benchmark]: CACSL2BoogieTranslator took 1347.57ms. Allocated memory is still 111.1MB. Free memory was 77.5MB in the beginning and 60.0MB in the end (delta: 17.5MB). Peak memory consumption was 44.7MB. Max. memory is 16.1GB. [2021-11-23 17:05:50,195 INFO L158 Benchmark]: Boogie Procedure Inliner took 273.30ms. Allocated memory is still 111.1MB. Free memory was 60.0MB in the beginning and 71.5MB in the end (delta: -11.4MB). Peak memory consumption was 27.5MB. Max. memory is 16.1GB. [2021-11-23 17:05:50,196 INFO L158 Benchmark]: Boogie Preprocessor took 260.46ms. Allocated memory is still 111.1MB. Free memory was 71.5MB in the beginning and 62.3MB in the end (delta: 9.2MB). Peak memory consumption was 17.2MB. Max. memory is 16.1GB. [2021-11-23 17:05:50,197 INFO L158 Benchmark]: RCFGBuilder took 3239.06ms. Allocated memory was 111.1MB in the beginning and 161.5MB in the end (delta: 50.3MB). Free memory was 62.3MB in the beginning and 101.1MB in the end (delta: -38.8MB). Peak memory consumption was 48.0MB. Max. memory is 16.1GB. [2021-11-23 17:05:50,208 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32ms. Allocated memory is still 79.7MB. Free memory is still 45.0MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 1347.57ms. Allocated memory is still 111.1MB. Free memory was 77.5MB in the beginning and 60.0MB in the end (delta: 17.5MB). Peak memory consumption was 44.7MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 273.30ms. Allocated memory is still 111.1MB. Free memory was 60.0MB in the beginning and 71.5MB in the end (delta: -11.4MB). Peak memory consumption was 27.5MB. Max. memory is 16.1GB. * Boogie Preprocessor took 260.46ms. Allocated memory is still 111.1MB. Free memory was 71.5MB in the beginning and 62.3MB in the end (delta: 9.2MB). Peak memory consumption was 17.2MB. Max. memory is 16.1GB. * RCFGBuilder took 3239.06ms. Allocated memory was 111.1MB in the beginning and 161.5MB in the end (delta: 50.3MB). Free memory was 62.3MB in the beginning and 101.1MB in the end (delta: -38.8MB). Peak memory consumption was 48.0MB. 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 17:05:50,243 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/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_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/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_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem16_label05.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/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_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/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 0645d92d946523ae7f73519b10a8044529081b14933ba5ba70a68277fba7b19b --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:05:53,198 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:05:53,202 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:05:53,281 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:05:53,282 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:05:53,287 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:05:53,290 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:05:53,295 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:05:53,299 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:05:53,309 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:05:53,311 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:05:53,313 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:05:53,314 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:05:53,317 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:05:53,319 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:05:53,325 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:05:53,327 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:05:53,329 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:05:53,331 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:05:53,340 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:05:53,343 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:05:53,345 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:05:53,347 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:05:53,351 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:05:53,362 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:05:53,363 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:05:53,363 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:05:53,366 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:05:53,366 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:05:53,368 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:05:53,368 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:05:53,370 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:05:53,372 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:05:53,373 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:05:53,375 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:05:53,375 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:05:53,376 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:05:53,377 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:05:53,377 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:05:53,379 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:05:53,380 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:05:53,381 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:05:53,433 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:05:53,434 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:05:53,435 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:05:53,435 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:05:53,436 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:05:53,436 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:05:53,437 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:05:53,437 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:05:53,438 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:05:53,438 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:05:53,440 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:05:53,440 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:05:53,442 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:05:53,442 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:05:53,442 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:05:53,442 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:05:53,443 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:05:53,443 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:05:53,443 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:05:53,444 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:05:53,444 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:05:53,444 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:05:53,444 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:05:53,445 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:05:53,445 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:05:53,445 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:05:53,446 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:05:53,446 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:05:53,446 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:05:53,446 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:05:53,447 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:05:53,447 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:05:53,448 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:05:53,448 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:05:53,448 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:05:53,449 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:05:53,449 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:05:53,449 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:05:53,450 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_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0645d92d946523ae7f73519b10a8044529081b14933ba5ba70a68277fba7b19b [2021-11-23 17:05:53,911 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:05:53,937 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:05:53,940 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:05:53,942 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:05:53,947 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:05:53,949 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/eca-rers2012/Problem16_label05.c [2021-11-23 17:05:54,035 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/data/db0301a64/b8cb0806abcc4b539daed3b7ae0163c1/FLAG85d20f107 [2021-11-23 17:05:54,974 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:05:54,974 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/sv-benchmarks/c/eca-rers2012/Problem16_label05.c [2021-11-23 17:05:55,001 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/data/db0301a64/b8cb0806abcc4b539daed3b7ae0163c1/FLAG85d20f107 [2021-11-23 17:05:55,070 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/data/db0301a64/b8cb0806abcc4b539daed3b7ae0163c1 [2021-11-23 17:05:55,074 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:05:55,077 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:05:55,080 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:05:55,081 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:05:55,085 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:05:55,087 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:05:55" (1/1) ... [2021-11-23 17:05:55,089 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@eb7044 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:55, skipping insertion in model container [2021-11-23 17:05:55,090 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:05:55" (1/1) ... [2021-11-23 17:05:55,098 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:05:55,209 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:05:55,432 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_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/sv-benchmarks/c/eca-rers2012/Problem16_label05.c[2198,2211] [2021-11-23 17:05:56,152 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:05:56,166 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:05:56,205 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_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/sv-benchmarks/c/eca-rers2012/Problem16_label05.c[2198,2211] [2021-11-23 17:05:56,482 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:05:56,501 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:05:56,502 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:56 WrapperNode [2021-11-23 17:05:56,502 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:05:56,503 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:05:56,503 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:05:56,504 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:05:56,512 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:56" (1/1) ... [2021-11-23 17:05:56,558 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:56" (1/1) ... [2021-11-23 17:05:56,685 INFO L137 Inliner]: procedures = 15, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 1765 [2021-11-23 17:05:56,686 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:05:56,687 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:05:56,688 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:05:56,689 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:05:56,699 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:56" (1/1) ... [2021-11-23 17:05:56,700 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:56" (1/1) ... [2021-11-23 17:05:56,713 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:56" (1/1) ... [2021-11-23 17:05:56,713 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:56" (1/1) ... [2021-11-23 17:05:56,777 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:56" (1/1) ... [2021-11-23 17:05:56,825 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:56" (1/1) ... [2021-11-23 17:05:56,844 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:56" (1/1) ... [2021-11-23 17:05:56,855 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:05:56,858 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:05:56,859 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:05:56,859 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:05:56,864 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:56" (1/1) ... [2021-11-23 17:05:56,873 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:05:56,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:05:56,940 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:05:56,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:05:57,039 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:05:57,040 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:05:57,040 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:05:57,040 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:05:57,143 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:05:57,145 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:06:06,405 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:06:06,423 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:06:06,426 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 17:06:06,430 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:06:06 BoogieIcfgContainer [2021-11-23 17:06:06,431 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:06:06,435 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:06:06,435 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:06:06,439 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:06:06,439 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:05:55" (1/3) ... [2021-11-23 17:06:06,440 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64ad7aa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:06:06, skipping insertion in model container [2021-11-23 17:06:06,441 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:56" (2/3) ... [2021-11-23 17:06:06,441 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64ad7aa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:06:06, skipping insertion in model container [2021-11-23 17:06:06,441 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:06:06" (3/3) ... [2021-11-23 17:06:06,443 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem16_label05.c [2021-11-23 17:06:06,452 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:06:06,452 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 17:06:06,525 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:06:06,534 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 17:06:06,534 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 17:06:06,584 INFO L276 IsEmpty]: Start isEmpty. Operand has 396 states, 394 states have (on average 1.8350253807106598) internal successors, (723), 395 states have internal predecessors, (723), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:06,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 17:06:06,590 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:06,590 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:06:06,591 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:06,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:06,597 INFO L85 PathProgramCache]: Analyzing trace with hash 406614337, now seen corresponding path program 1 times [2021-11-23 17:06:06,611 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:06,612 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1155000102] [2021-11-23 17:06:06,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:06,613 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:06,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:06,627 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:06,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:06:06,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:06,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:06:06,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:06,852 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:06,853 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:06:06,854 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:06,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1155000102] [2021-11-23 17:06:06,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1155000102] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:06:06,855 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:06:06,855 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:06:06,857 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508491434] [2021-11-23 17:06:06,858 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:06:06,863 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:06:06,863 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:06,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:06:06,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:06:06,902 INFO L87 Difference]: Start difference. First operand has 396 states, 394 states have (on average 1.8350253807106598) internal successors, (723), 395 states have internal predecessors, (723), 0 states have call successors, (0), 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 6.333333333333333) internal successors, (19), 2 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:17,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:17,876 INFO L93 Difference]: Finished difference Result 1122 states and 2103 transitions. [2021-11-23 17:06:17,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:06:17,879 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 2 states have internal predecessors, (19), 0 states have call successors, (0), 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 19 [2021-11-23 17:06:17,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:17,908 INFO L225 Difference]: With dead ends: 1122 [2021-11-23 17:06:17,908 INFO L226 Difference]: Without dead ends: 662 [2021-11-23 17:06:17,915 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:06:17,919 INFO L933 BasicCegarLoop]: 246 mSDtfsCounter, 368 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 864 mSolverCounterSat, 450 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 368 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 1314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 450 IncrementalHoareTripleChecker+Valid, 864 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:06:17,921 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [368 Valid, 254 Invalid, 1314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [450 Valid, 864 Invalid, 0 Unknown, 0 Unchecked, 10.8s Time] [2021-11-23 17:06:17,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 662 states. [2021-11-23 17:06:18,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 662 to 662. [2021-11-23 17:06:18,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 662 states, 661 states have (on average 1.518910741301059) internal successors, (1004), 661 states have internal predecessors, (1004), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:18,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 662 states to 662 states and 1004 transitions. [2021-11-23 17:06:18,051 INFO L78 Accepts]: Start accepts. Automaton has 662 states and 1004 transitions. Word has length 19 [2021-11-23 17:06:18,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:18,052 INFO L470 AbstractCegarLoop]: Abstraction has 662 states and 1004 transitions. [2021-11-23 17:06:18,053 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 2 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:18,053 INFO L276 IsEmpty]: Start isEmpty. Operand 662 states and 1004 transitions. [2021-11-23 17:06:18,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-23 17:06:18,057 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:18,058 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:06:18,075 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2021-11-23 17:06:18,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:06:18,275 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:18,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:18,276 INFO L85 PathProgramCache]: Analyzing trace with hash 1192952518, now seen corresponding path program 1 times [2021-11-23 17:06:18,278 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:18,279 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [531442017] [2021-11-23 17:06:18,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:18,280 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:18,280 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:18,281 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:18,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:06:18,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:18,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:06:18,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:18,790 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:18,790 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:06:18,791 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:18,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [531442017] [2021-11-23 17:06:18,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [531442017] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:06:18,792 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:06:18,792 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:06:18,792 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842433450] [2021-11-23 17:06:18,792 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:06:18,794 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:06:18,794 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:18,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:06:18,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:06:18,796 INFO L87 Difference]: Start difference. First operand 662 states and 1004 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:29,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:29,867 INFO L93 Difference]: Finished difference Result 1980 states and 3007 transitions. [2021-11-23 17:06:29,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:06:29,868 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 0 states have call successors, (0), 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 87 [2021-11-23 17:06:29,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:29,880 INFO L225 Difference]: With dead ends: 1980 [2021-11-23 17:06:29,881 INFO L226 Difference]: Without dead ends: 1320 [2021-11-23 17:06:29,884 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:06:29,886 INFO L933 BasicCegarLoop]: 220 mSDtfsCounter, 271 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 961 mSolverCounterSat, 218 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 271 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 1179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 218 IncrementalHoareTripleChecker+Valid, 961 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:06:29,887 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [271 Valid, 225 Invalid, 1179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [218 Valid, 961 Invalid, 0 Unknown, 0 Unchecked, 11.0s Time] [2021-11-23 17:06:29,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1320 states. [2021-11-23 17:06:29,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1320 to 1320. [2021-11-23 17:06:29,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1320 states, 1319 states have (on average 1.3146322971948445) internal successors, (1734), 1319 states have internal predecessors, (1734), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:29,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1320 states to 1320 states and 1734 transitions. [2021-11-23 17:06:29,962 INFO L78 Accepts]: Start accepts. Automaton has 1320 states and 1734 transitions. Word has length 87 [2021-11-23 17:06:29,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:29,963 INFO L470 AbstractCegarLoop]: Abstraction has 1320 states and 1734 transitions. [2021-11-23 17:06:29,963 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:29,963 INFO L276 IsEmpty]: Start isEmpty. Operand 1320 states and 1734 transitions. [2021-11-23 17:06:29,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-23 17:06:29,979 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:29,980 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:06:29,989 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:30,181 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:06:30,181 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:30,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:30,182 INFO L85 PathProgramCache]: Analyzing trace with hash -6118856, now seen corresponding path program 1 times [2021-11-23 17:06:30,184 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:30,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [347296666] [2021-11-23 17:06:30,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:30,185 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:30,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:30,188 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:30,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:06:30,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:30,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:06:30,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:32,020 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 44 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:32,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:36,928 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 44 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:36,929 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:36,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [347296666] [2021-11-23 17:06:36,929 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [347296666] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:06:36,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1646173368] [2021-11-23 17:06:36,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:36,930 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:06:36,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:06:36,933 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:06:36,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-11-23 17:06:37,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:37,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:06:37,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:39,658 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 83 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:39,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:41,585 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 83 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:41,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1646173368] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:06:41,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [358070329] [2021-11-23 17:06:41,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:41,586 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:06:41,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:06:41,591 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:06:41,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 17:06:41,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:41,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:06:41,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:44,033 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 91 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:44,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:45,128 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 100 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:45,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [358070329] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 17:06:45,129 INFO L186 FreeRefinementEngine]: Found 1 perfect and 5 imperfect interpolant sequences. [2021-11-23 17:06:45,130 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [3, 3, 8, 8, 5] total 22 [2021-11-23 17:06:45,130 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341197468] [2021-11-23 17:06:45,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:06:45,132 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:06:45,132 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:45,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:06:45,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=350, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:06:45,134 INFO L87 Difference]: Start difference. First operand 1320 states and 1734 transitions. Second operand has 5 states, 5 states have (on average 34.8) internal successors, (174), 5 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:56,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:56,453 INFO L93 Difference]: Finished difference Result 3343 states and 4514 transitions. [2021-11-23 17:06:56,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:06:56,454 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 34.8) internal successors, (174), 5 states have internal predecessors, (174), 0 states have call successors, (0), 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 174 [2021-11-23 17:06:56,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:56,466 INFO L225 Difference]: With dead ends: 3343 [2021-11-23 17:06:56,466 INFO L226 Difference]: Without dead ends: 2025 [2021-11-23 17:06:56,468 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1038 GetRequests, 1018 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=112, Invalid=350, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:06:56,470 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 504 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 1263 mSolverCounterSat, 422 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 504 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 1685 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 422 IncrementalHoareTripleChecker+Valid, 1263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:06:56,470 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [504 Valid, 42 Invalid, 1685 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [422 Valid, 1263 Invalid, 0 Unknown, 0 Unchecked, 11.2s Time] [2021-11-23 17:06:56,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2025 states. [2021-11-23 17:06:56,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2025 to 1978. [2021-11-23 17:06:56,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1978 states, 1977 states have (on average 1.3651997976732422) internal successors, (2699), 1977 states have internal predecessors, (2699), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:56,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1978 states to 1978 states and 2699 transitions. [2021-11-23 17:06:56,519 INFO L78 Accepts]: Start accepts. Automaton has 1978 states and 2699 transitions. Word has length 174 [2021-11-23 17:06:56,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:56,520 INFO L470 AbstractCegarLoop]: Abstraction has 1978 states and 2699 transitions. [2021-11-23 17:06:56,521 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 34.8) internal successors, (174), 5 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:56,521 INFO L276 IsEmpty]: Start isEmpty. Operand 1978 states and 2699 transitions. [2021-11-23 17:06:56,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2021-11-23 17:06:56,524 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:56,525 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:06:56,543 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:56,757 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-23 17:06:56,937 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (5)] Ended with exit code 0 [2021-11-23 17:06:57,136 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:06:57,137 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:57,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:57,138 INFO L85 PathProgramCache]: Analyzing trace with hash 2122908013, now seen corresponding path program 1 times [2021-11-23 17:06:57,139 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:57,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [237178305] [2021-11-23 17:06:57,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:57,140 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:57,140 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:57,145 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:57,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:06:57,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:57,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:06:57,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:58,178 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:58,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:01,240 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:01,240 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:01,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [237178305] [2021-11-23 17:07:01,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [237178305] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:01,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1130117570] [2021-11-23 17:07:01,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:01,241 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:07:01,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:07:01,242 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:07:01,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (8)] Waiting until timeout for monitored process [2021-11-23 17:07:01,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:01,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:07:01,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:02,935 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 94 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:02,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:04,123 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 94 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:04,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1130117570] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:04,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2045161074] [2021-11-23 17:07:04,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:04,123 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:07:04,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:07:04,125 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:07:04,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 17:07:04,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:04,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:07:04,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:05,841 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 111 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:05,841 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:07:05,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2045161074] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:07:05,841 INFO L186 FreeRefinementEngine]: Found 1 perfect and 4 imperfect interpolant sequences. [2021-11-23 17:07:05,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [4, 4, 8, 8] total 21 [2021-11-23 17:07:05,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938155152] [2021-11-23 17:07:05,842 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:07:05,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:07:05,843 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:05,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:07:05,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=328, Unknown=0, NotChecked=0, Total=420 [2021-11-23 17:07:05,844 INFO L87 Difference]: Start difference. First operand 1978 states and 2699 transitions. Second operand has 7 states, 7 states have (on average 26.428571428571427) internal successors, (185), 6 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:07:11,279 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.43s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:07:15,364 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:07:25,184 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.12s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:07:27,128 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.88s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:07:27,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:27,677 INFO L93 Difference]: Finished difference Result 4387 states and 5895 transitions. [2021-11-23 17:07:27,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:07:27,681 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 26.428571428571427) internal successors, (185), 6 states have internal predecessors, (185), 0 states have call successors, (0), 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 185 [2021-11-23 17:07:27,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:27,693 INFO L225 Difference]: With dead ends: 4387 [2021-11-23 17:07:27,694 INFO L226 Difference]: Without dead ends: 2307 [2021-11-23 17:07:27,697 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 920 GetRequests, 901 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=92, Invalid=328, Unknown=0, NotChecked=0, Total=420 [2021-11-23 17:07:27,698 INFO L933 BasicCegarLoop]: 256 mSDtfsCounter, 355 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 1957 mSolverCounterSat, 377 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 355 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 2334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 377 IncrementalHoareTripleChecker+Valid, 1957 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:07:27,698 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [355 Valid, 286 Invalid, 2334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [377 Valid, 1957 Invalid, 0 Unknown, 0 Unchecked, 21.8s Time] [2021-11-23 17:07:27,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2307 states. [2021-11-23 17:07:27,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2307 to 2307. [2021-11-23 17:07:27,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2307 states, 2306 states have (on average 1.1201214223764093) internal successors, (2583), 2306 states have internal predecessors, (2583), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:07:27,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2307 states to 2307 states and 2583 transitions. [2021-11-23 17:07:27,752 INFO L78 Accepts]: Start accepts. Automaton has 2307 states and 2583 transitions. Word has length 185 [2021-11-23 17:07:27,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:27,753 INFO L470 AbstractCegarLoop]: Abstraction has 2307 states and 2583 transitions. [2021-11-23 17:07:27,753 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 26.428571428571427) internal successors, (185), 6 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:07:27,753 INFO L276 IsEmpty]: Start isEmpty. Operand 2307 states and 2583 transitions. [2021-11-23 17:07:27,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2021-11-23 17:07:27,757 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:27,757 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:07:27,766 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:27,980 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:28,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:28,363 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:07:28,363 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:28,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:28,376 INFO L85 PathProgramCache]: Analyzing trace with hash 854254535, now seen corresponding path program 1 times [2021-11-23 17:07:28,377 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:28,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [543953948] [2021-11-23 17:07:28,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:28,377 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:28,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:28,378 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:28,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:07:28,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:28,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:07:28,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:29,008 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 111 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 17:07:29,008 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:07:29,009 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:29,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [543953948] [2021-11-23 17:07:29,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [543953948] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:07:29,009 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:07:29,009 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:07:29,009 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037037975] [2021-11-23 17:07:29,009 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:07:29,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:07:29,010 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:29,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:07:29,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:07:29,011 INFO L87 Difference]: Start difference. First operand 2307 states and 2583 transitions. Second operand has 3 states, 3 states have (on average 74.66666666666667) internal successors, (224), 2 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:07:32,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:32,565 INFO L93 Difference]: Finished difference Result 5270 states and 5841 transitions. [2021-11-23 17:07:32,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:07:32,568 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 74.66666666666667) internal successors, (224), 2 states have internal predecessors, (224), 0 states have call successors, (0), 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 240 [2021-11-23 17:07:32,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:32,582 INFO L225 Difference]: With dead ends: 5270 [2021-11-23 17:07:32,582 INFO L226 Difference]: Without dead ends: 2965 [2021-11-23 17:07:32,585 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 238 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:07:32,589 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 236 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 764 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 236 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 768 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 764 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:07:32,590 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [236 Valid, 108 Invalid, 768 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 764 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2021-11-23 17:07:32,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2965 states. [2021-11-23 17:07:32,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2965 to 2965. [2021-11-23 17:07:32,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2965 states, 2964 states have (on average 1.097165991902834) internal successors, (3252), 2964 states have internal predecessors, (3252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:07:32,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2965 states to 2965 states and 3252 transitions. [2021-11-23 17:07:32,668 INFO L78 Accepts]: Start accepts. Automaton has 2965 states and 3252 transitions. Word has length 240 [2021-11-23 17:07:32,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:32,668 INFO L470 AbstractCegarLoop]: Abstraction has 2965 states and 3252 transitions. [2021-11-23 17:07:32,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 74.66666666666667) internal successors, (224), 2 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:07:32,669 INFO L276 IsEmpty]: Start isEmpty. Operand 2965 states and 3252 transitions. [2021-11-23 17:07:32,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 380 [2021-11-23 17:07:32,676 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:32,676 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:07:32,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:32,888 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:07:32,889 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:32,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:32,890 INFO L85 PathProgramCache]: Analyzing trace with hash 1687539470, now seen corresponding path program 1 times [2021-11-23 17:07:32,892 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:32,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [671772231] [2021-11-23 17:07:32,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:32,893 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:32,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:32,894 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:32,921 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:07:33,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:33,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:07:33,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:34,453 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 157 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:34,453 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:07:34,453 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:34,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [671772231] [2021-11-23 17:07:34,454 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [671772231] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:07:34,454 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:07:34,454 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:07:34,454 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884386392] [2021-11-23 17:07:34,454 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:07:34,455 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:07:34,455 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:34,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:07:34,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:07:34,456 INFO L87 Difference]: Start difference. First operand 2965 states and 3252 transitions. Second operand has 4 states, 4 states have (on average 94.75) internal successors, (379), 3 states have internal predecessors, (379), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:07:39,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:39,613 INFO L93 Difference]: Finished difference Result 5599 states and 6171 transitions. [2021-11-23 17:07:39,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:07:39,616 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 94.75) internal successors, (379), 3 states have internal predecessors, (379), 0 states have call successors, (0), 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 379 [2021-11-23 17:07:39,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:39,631 INFO L225 Difference]: With dead ends: 5599 [2021-11-23 17:07:39,631 INFO L226 Difference]: Without dead ends: 2965 [2021-11-23 17:07:39,635 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 376 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:07:39,636 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 303 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 1515 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 303 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 1521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1515 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:07:39,636 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [303 Valid, 123 Invalid, 1521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 1515 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2021-11-23 17:07:39,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2965 states. [2021-11-23 17:07:39,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2965 to 2965. [2021-11-23 17:07:39,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2965 states, 2964 states have (on average 1.094804318488529) internal successors, (3245), 2964 states have internal predecessors, (3245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:07:39,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2965 states to 2965 states and 3245 transitions. [2021-11-23 17:07:39,727 INFO L78 Accepts]: Start accepts. Automaton has 2965 states and 3245 transitions. Word has length 379 [2021-11-23 17:07:39,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:39,728 INFO L470 AbstractCegarLoop]: Abstraction has 2965 states and 3245 transitions. [2021-11-23 17:07:39,728 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 94.75) internal successors, (379), 3 states have internal predecessors, (379), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:07:39,729 INFO L276 IsEmpty]: Start isEmpty. Operand 2965 states and 3245 transitions. [2021-11-23 17:07:39,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 484 [2021-11-23 17:07:39,739 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:39,740 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:07:39,752 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:39,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:07:39,952 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:39,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:39,952 INFO L85 PathProgramCache]: Analyzing trace with hash 667370895, now seen corresponding path program 1 times [2021-11-23 17:07:39,954 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:39,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1741435367] [2021-11-23 17:07:39,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:39,955 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:39,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:39,955 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:39,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 17:07:40,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:40,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:07:40,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:41,748 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 50 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:41,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:43,579 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 270 proven. 0 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-23 17:07:43,579 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:43,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1741435367] [2021-11-23 17:07:43,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1741435367] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 17:07:43,580 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 17:07:43,580 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2021-11-23 17:07:43,580 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561832271] [2021-11-23 17:07:43,580 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:07:43,581 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:07:43,581 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:43,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:07:43,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:07:43,582 INFO L87 Difference]: Start difference. First operand 2965 states and 3245 transitions. Second operand has 3 states, 3 states have (on average 129.66666666666666) internal successors, (389), 3 states have internal predecessors, (389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:07:48,700 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 17:07:56,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:56,362 INFO L93 Difference]: Finished difference Result 6257 states and 7013 transitions. [2021-11-23 17:07:56,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:07:56,366 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 129.66666666666666) internal successors, (389), 3 states have internal predecessors, (389), 0 states have call successors, (0), 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 483 [2021-11-23 17:07:56,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:56,392 INFO L225 Difference]: With dead ends: 6257 [2021-11-23 17:07:56,393 INFO L226 Difference]: Without dead ends: 3952 [2021-11-23 17:07:56,395 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 964 GetRequests, 960 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:07:56,396 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 211 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 757 mSolverCounterSat, 177 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 934 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 177 IncrementalHoareTripleChecker+Valid, 757 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:07:56,397 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 24 Invalid, 934 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [177 Valid, 757 Invalid, 0 Unknown, 0 Unchecked, 12.7s Time] [2021-11-23 17:07:56,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3952 states. [2021-11-23 17:07:56,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3952 to 3952. [2021-11-23 17:07:56,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3952 states, 3951 states have (on average 1.1149076183244748) internal successors, (4405), 3951 states have internal predecessors, (4405), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:07:56,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3952 states to 3952 states and 4405 transitions. [2021-11-23 17:07:56,476 INFO L78 Accepts]: Start accepts. Automaton has 3952 states and 4405 transitions. Word has length 483 [2021-11-23 17:07:56,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:56,477 INFO L470 AbstractCegarLoop]: Abstraction has 3952 states and 4405 transitions. [2021-11-23 17:07:56,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 129.66666666666666) internal successors, (389), 3 states have internal predecessors, (389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:07:56,478 INFO L276 IsEmpty]: Start isEmpty. Operand 3952 states and 4405 transitions. [2021-11-23 17:07:56,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2021-11-23 17:07:56,491 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:56,491 INFO L514 BasicCegarLoop]: trace histogram [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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:07:56,504 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Ended with exit code 0 [2021-11-23 17:07:56,703 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:07:56,707 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:56,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:56,707 INFO L85 PathProgramCache]: Analyzing trace with hash -1108841050, now seen corresponding path program 1 times [2021-11-23 17:07:56,709 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:56,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2027407521] [2021-11-23 17:07:56,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:56,710 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:56,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:56,711 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:56,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 17:07:56,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:56,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 553 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:07:56,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:59,668 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 33 proven. 0 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2021-11-23 17:07:59,668 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:07:59,669 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:59,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2027407521] [2021-11-23 17:07:59,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2027407521] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:07:59,669 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:07:59,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:07:59,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352549294] [2021-11-23 17:07:59,669 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:07:59,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:07:59,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:59,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:07:59,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:07:59,671 INFO L87 Difference]: Start difference. First operand 3952 states and 4405 transitions. Second operand has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 2 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:03,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:03,460 INFO L93 Difference]: Finished difference Result 7244 states and 8146 transitions. [2021-11-23 17:08:03,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:08:03,464 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 2 states have internal predecessors, (266), 0 states have call successors, (0), 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 507 [2021-11-23 17:08:03,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:03,486 INFO L225 Difference]: With dead ends: 7244 [2021-11-23 17:08:03,486 INFO L226 Difference]: Without dead ends: 3952 [2021-11-23 17:08:03,490 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 505 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:08:03,491 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 85 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 758 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 759 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 758 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:03,491 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 114 Invalid, 759 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 758 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2021-11-23 17:08:03,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3952 states. [2021-11-23 17:08:03,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3952 to 3952. [2021-11-23 17:08:03,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3952 states, 3951 states have (on average 1.1146545178435838) internal successors, (4404), 3951 states have internal predecessors, (4404), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:03,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3952 states to 3952 states and 4404 transitions. [2021-11-23 17:08:03,572 INFO L78 Accepts]: Start accepts. Automaton has 3952 states and 4404 transitions. Word has length 507 [2021-11-23 17:08:03,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:03,573 INFO L470 AbstractCegarLoop]: Abstraction has 3952 states and 4404 transitions. [2021-11-23 17:08:03,574 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 2 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:03,574 INFO L276 IsEmpty]: Start isEmpty. Operand 3952 states and 4404 transitions. [2021-11-23 17:08:03,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 518 [2021-11-23 17:08:03,579 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:03,579 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:03,591 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Ended with exit code 0 [2021-11-23 17:08:03,791 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:08:03,794 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:03,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:03,795 INFO L85 PathProgramCache]: Analyzing trace with hash -1936397820, now seen corresponding path program 1 times [2021-11-23 17:08:03,797 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:03,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [317489499] [2021-11-23 17:08:03,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:03,797 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:03,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:03,798 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:03,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 17:08:03,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:03,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 574 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:08:03,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:08,650 INFO L134 CoverageAnalysis]: Checked inductivity of 399 backedges. 50 proven. 349 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:08,650 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:13,531 INFO L134 CoverageAnalysis]: Checked inductivity of 399 backedges. 264 proven. 40 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-23 17:08:13,531 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:13,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [317489499] [2021-11-23 17:08:13,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [317489499] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:13,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1455910779] [2021-11-23 17:08:13,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:13,532 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:13,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:08:13,533 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:08:13,534 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-11-23 17:08:13,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:13,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 574 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:08:13,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:14,668 INFO L134 CoverageAnalysis]: Checked inductivity of 399 backedges. 304 proven. 0 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-23 17:08:14,669 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:08:14,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1455910779] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:08:14,669 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:08:14,670 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5, 4] total 9 [2021-11-23 17:08:14,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916946971] [2021-11-23 17:08:14,671 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:08:14,672 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:08:14,672 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:14,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:08:14,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:08:14,673 INFO L87 Difference]: Start difference. First operand 3952 states and 4404 transitions. Second operand has 3 states, 3 states have (on average 141.0) internal successors, (423), 3 states have internal predecessors, (423), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:19,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:19,263 INFO L93 Difference]: Finished difference Result 7902 states and 8883 transitions. [2021-11-23 17:08:19,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:08:19,267 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 141.0) internal successors, (423), 3 states have internal predecessors, (423), 0 states have call successors, (0), 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 517 [2021-11-23 17:08:19,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:19,286 INFO L225 Difference]: With dead ends: 7902 [2021-11-23 17:08:19,286 INFO L226 Difference]: Without dead ends: 4610 [2021-11-23 17:08:19,289 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1548 GetRequests, 1541 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:08:19,290 INFO L933 BasicCegarLoop]: 424 mSDtfsCounter, 171 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 759 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 430 SdHoareTripleChecker+Invalid, 823 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 759 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:19,290 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 430 Invalid, 823 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 759 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2021-11-23 17:08:19,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4610 states. [2021-11-23 17:08:19,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4610 to 4610. [2021-11-23 17:08:19,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4610 states, 4609 states have (on average 1.1028422651334346) internal successors, (5083), 4609 states have internal predecessors, (5083), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:19,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4610 states to 4610 states and 5083 transitions. [2021-11-23 17:08:19,385 INFO L78 Accepts]: Start accepts. Automaton has 4610 states and 5083 transitions. Word has length 517 [2021-11-23 17:08:19,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:19,387 INFO L470 AbstractCegarLoop]: Abstraction has 4610 states and 5083 transitions. [2021-11-23 17:08:19,387 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 141.0) internal successors, (423), 3 states have internal predecessors, (423), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:19,387 INFO L276 IsEmpty]: Start isEmpty. Operand 4610 states and 5083 transitions. [2021-11-23 17:08:19,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 633 [2021-11-23 17:08:19,394 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:19,395 INFO L514 BasicCegarLoop]: trace histogram [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, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:19,399 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (15)] Ended with exit code 0 [2021-11-23 17:08:19,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:19,797 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:08:19,797 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:19,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:19,798 INFO L85 PathProgramCache]: Analyzing trace with hash -701154673, now seen corresponding path program 1 times [2021-11-23 17:08:19,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:19,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [415670159] [2021-11-23 17:08:19,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:19,801 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:19,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:19,803 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:19,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 17:08:19,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:19,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 689 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:08:19,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:22,561 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 0 proven. 367 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2021-11-23 17:08:22,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:38,967 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 0 proven. 367 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2021-11-23 17:08:38,967 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:38,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [415670159] [2021-11-23 17:08:38,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [415670159] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:38,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1832980694] [2021-11-23 17:08:38,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:38,968 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:38,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:08:38,991 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:08:38,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-23 17:08:39,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:39,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 689 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:08:39,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:40,025 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 535 trivial. 0 not checked. [2021-11-23 17:08:40,025 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:08:40,025 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1832980694] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:08:40,026 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:08:40,026 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5, 5] total 9 [2021-11-23 17:08:40,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214850196] [2021-11-23 17:08:40,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:08:40,027 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:08:40,027 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:40,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:08:40,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:08:40,028 INFO L87 Difference]: Start difference. First operand 4610 states and 5083 transitions. Second operand has 3 states, 3 states have (on average 85.66666666666667) internal successors, (257), 3 states have internal predecessors, (257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:44,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:44,636 INFO L93 Difference]: Finished difference Result 9876 states and 10994 transitions. [2021-11-23 17:08:44,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:08:44,637 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 85.66666666666667) internal successors, (257), 3 states have internal predecessors, (257), 0 states have call successors, (0), 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 632 [2021-11-23 17:08:44,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:44,663 INFO L225 Difference]: With dead ends: 9876 [2021-11-23 17:08:44,663 INFO L226 Difference]: Without dead ends: 5926 [2021-11-23 17:08:44,667 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1893 GetRequests, 1886 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:08:44,668 INFO L933 BasicCegarLoop]: 421 mSDtfsCounter, 328 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 744 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 328 SdHoareTripleChecker+Valid, 427 SdHoareTripleChecker+Invalid, 835 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 744 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:44,668 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [328 Valid, 427 Invalid, 835 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 744 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2021-11-23 17:08:44,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5926 states. [2021-11-23 17:08:44,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5926 to 5926. [2021-11-23 17:08:44,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5926 states, 5925 states have (on average 1.089282700421941) internal successors, (6454), 5925 states have internal predecessors, (6454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:44,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5926 states to 5926 states and 6454 transitions. [2021-11-23 17:08:44,761 INFO L78 Accepts]: Start accepts. Automaton has 5926 states and 6454 transitions. Word has length 632 [2021-11-23 17:08:44,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:44,763 INFO L470 AbstractCegarLoop]: Abstraction has 5926 states and 6454 transitions. [2021-11-23 17:08:44,764 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 85.66666666666667) internal successors, (257), 3 states have internal predecessors, (257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:44,764 INFO L276 IsEmpty]: Start isEmpty. Operand 5926 states and 6454 transitions. [2021-11-23 17:08:44,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 773 [2021-11-23 17:08:44,774 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:44,775 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:08:44,782 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:44,985 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:45,177 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:08:45,178 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:45,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:45,178 INFO L85 PathProgramCache]: Analyzing trace with hash -1233777976, now seen corresponding path program 1 times [2021-11-23 17:08:45,184 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:45,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [993242647] [2021-11-23 17:08:45,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:45,184 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:45,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:45,185 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:45,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 17:08:45,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:45,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 841 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:08:45,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:48,431 INFO L134 CoverageAnalysis]: Checked inductivity of 1021 backedges. 98 proven. 705 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2021-11-23 17:08:48,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:04,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1021 backedges. 98 proven. 705 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2021-11-23 17:09:04,039 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:04,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [993242647] [2021-11-23 17:09:04,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [993242647] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:04,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1431521183] [2021-11-23 17:09:04,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:04,040 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:04,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:09:04,041 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:09:04,042 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-23 17:09:04,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:04,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 841 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:09:04,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:05,488 INFO L134 CoverageAnalysis]: Checked inductivity of 1021 backedges. 486 proven. 0 refuted. 0 times theorem prover too weak. 535 trivial. 0 not checked. [2021-11-23 17:09:05,488 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:09:05,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1431521183] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:09:05,488 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:09:05,489 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5, 5] total 9 [2021-11-23 17:09:05,489 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999313586] [2021-11-23 17:09:05,489 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:09:05,490 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:09:05,490 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:05,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:09:05,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:09:05,492 INFO L87 Difference]: Start difference. First operand 5926 states and 6454 transitions. Second operand has 3 states, 3 states have (on average 132.33333333333334) internal successors, (397), 3 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:10,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:09:10,158 INFO L93 Difference]: Finished difference Result 12508 states and 13753 transitions. [2021-11-23 17:09:10,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:09:10,164 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 132.33333333333334) internal successors, (397), 3 states have internal predecessors, (397), 0 states have call successors, (0), 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 772 [2021-11-23 17:09:10,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:09:10,179 INFO L225 Difference]: With dead ends: 12508 [2021-11-23 17:09:10,180 INFO L226 Difference]: Without dead ends: 7242 [2021-11-23 17:09:10,185 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2313 GetRequests, 2306 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:09:10,185 INFO L933 BasicCegarLoop]: 416 mSDtfsCounter, 197 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 771 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 421 SdHoareTripleChecker+Invalid, 852 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 771 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:09:10,186 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [197 Valid, 421 Invalid, 852 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 771 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2021-11-23 17:09:10,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7242 states. [2021-11-23 17:09:10,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7242 to 7242. [2021-11-23 17:09:10,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7242 states, 7241 states have (on average 1.0806518436680017) internal successors, (7825), 7241 states have internal predecessors, (7825), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:10,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7242 states to 7242 states and 7825 transitions. [2021-11-23 17:09:10,263 INFO L78 Accepts]: Start accepts. Automaton has 7242 states and 7825 transitions. Word has length 772 [2021-11-23 17:09:10,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:09:10,265 INFO L470 AbstractCegarLoop]: Abstraction has 7242 states and 7825 transitions. [2021-11-23 17:09:10,265 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 132.33333333333334) internal successors, (397), 3 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:10,266 INFO L276 IsEmpty]: Start isEmpty. Operand 7242 states and 7825 transitions. [2021-11-23 17:09:10,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 804 [2021-11-23 17:09:10,279 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:09:10,279 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:09:10,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:10,492 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Ended with exit code 0 [2021-11-23 17:09:10,682 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:09:10,682 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:09:10,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:09:10,683 INFO L85 PathProgramCache]: Analyzing trace with hash -1070979044, now seen corresponding path program 1 times [2021-11-23 17:09:10,686 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:09:10,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [338834510] [2021-11-23 17:09:10,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:10,687 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:09:10,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:09:10,688 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:09:10,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 17:09:10,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:10,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 879 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:09:10,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:13,235 INFO L134 CoverageAnalysis]: Checked inductivity of 1214 backedges. 648 proven. 249 refuted. 0 times theorem prover too weak. 317 trivial. 0 not checked. [2021-11-23 17:09:13,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:31,265 INFO L134 CoverageAnalysis]: Checked inductivity of 1214 backedges. 648 proven. 249 refuted. 0 times theorem prover too weak. 317 trivial. 0 not checked. [2021-11-23 17:09:31,265 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:31,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [338834510] [2021-11-23 17:09:31,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [338834510] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:31,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [55085487] [2021-11-23 17:09:31,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:31,266 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:31,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:09:31,267 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:09:31,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-11-23 17:09:31,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:31,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 879 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:09:31,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:32,527 INFO L134 CoverageAnalysis]: Checked inductivity of 1214 backedges. 84 proven. 0 refuted. 0 times theorem prover too weak. 1130 trivial. 0 not checked. [2021-11-23 17:09:32,527 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:09:32,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [55085487] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:09:32,528 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:09:32,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-23 17:09:32,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308053872] [2021-11-23 17:09:32,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:09:32,530 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:09:32,530 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:32,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:09:32,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:09:32,530 INFO L87 Difference]: Start difference. First operand 7242 states and 7825 transitions. Second operand has 3 states, 3 states have (on average 86.33333333333333) internal successors, (259), 3 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:37,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:09:37,525 INFO L93 Difference]: Finished difference Result 15469 states and 16845 transitions. [2021-11-23 17:09:37,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:09:37,526 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 86.33333333333333) internal successors, (259), 3 states have internal predecessors, (259), 0 states have call successors, (0), 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 803 [2021-11-23 17:09:37,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:09:37,538 INFO L225 Difference]: With dead ends: 15469 [2021-11-23 17:09:37,539 INFO L226 Difference]: Without dead ends: 8887 [2021-11-23 17:09:37,546 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2406 GetRequests, 2401 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:09:37,547 INFO L933 BasicCegarLoop]: 383 mSDtfsCounter, 343 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 793 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 343 SdHoareTripleChecker+Valid, 389 SdHoareTripleChecker+Invalid, 866 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 793 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:09:37,547 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [343 Valid, 389 Invalid, 866 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 793 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2021-11-23 17:09:37,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8887 states. [2021-11-23 17:09:37,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8887 to 8887. [2021-11-23 17:09:37,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8887 states, 8886 states have (on average 1.0767499437317127) internal successors, (9568), 8886 states have internal predecessors, (9568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:37,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8887 states to 8887 states and 9568 transitions. [2021-11-23 17:09:37,698 INFO L78 Accepts]: Start accepts. Automaton has 8887 states and 9568 transitions. Word has length 803 [2021-11-23 17:09:37,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:09:37,699 INFO L470 AbstractCegarLoop]: Abstraction has 8887 states and 9568 transitions. [2021-11-23 17:09:37,699 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 86.33333333333333) internal successors, (259), 3 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:37,699 INFO L276 IsEmpty]: Start isEmpty. Operand 8887 states and 9568 transitions. [2021-11-23 17:09:37,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1039 [2021-11-23 17:09:37,720 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:09:37,721 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 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, 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, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:09:37,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:37,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:38,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:38,141 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:09:38,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:09:38,142 INFO L85 PathProgramCache]: Analyzing trace with hash -360523523, now seen corresponding path program 1 times [2021-11-23 17:09:38,149 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:09:38,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [904890809] [2021-11-23 17:09:38,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:38,150 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:09:38,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:09:38,151 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:09:38,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:09:38,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:38,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 1133 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:09:38,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:40,991 INFO L134 CoverageAnalysis]: Checked inductivity of 2400 backedges. 1338 proven. 249 refuted. 0 times theorem prover too weak. 813 trivial. 0 not checked. [2021-11-23 17:09:40,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:00,226 INFO L134 CoverageAnalysis]: Checked inductivity of 2400 backedges. 1338 proven. 249 refuted. 0 times theorem prover too weak. 813 trivial. 0 not checked. [2021-11-23 17:10:00,226 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:00,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [904890809] [2021-11-23 17:10:00,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [904890809] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:00,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1674546428] [2021-11-23 17:10:00,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:00,227 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:10:00,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:10:00,228 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:10:00,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-23 17:10:00,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:00,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 1133 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:10:00,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:01,857 INFO L134 CoverageAnalysis]: Checked inductivity of 2400 backedges. 667 proven. 0 refuted. 0 times theorem prover too weak. 1733 trivial. 0 not checked. [2021-11-23 17:10:01,857 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:10:01,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1674546428] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:10:01,858 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:10:01,859 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-23 17:10:01,859 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870372547] [2021-11-23 17:10:01,859 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:10:01,860 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:10:01,860 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:01,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:10:01,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:10:01,861 INFO L87 Difference]: Start difference. First operand 8887 states and 9568 transitions. Second operand has 3 states, 3 states have (on average 119.0) internal successors, (357), 3 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:06,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:06,320 INFO L93 Difference]: Finished difference Result 19746 states and 21381 transitions. [2021-11-23 17:10:06,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:10:06,327 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 119.0) internal successors, (357), 3 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 1038 [2021-11-23 17:10:06,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:06,366 INFO L225 Difference]: With dead ends: 19746 [2021-11-23 17:10:06,366 INFO L226 Difference]: Without dead ends: 11519 [2021-11-23 17:10:06,375 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3111 GetRequests, 3106 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:10:06,376 INFO L933 BasicCegarLoop]: 424 mSDtfsCounter, 240 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 747 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 240 SdHoareTripleChecker+Valid, 429 SdHoareTripleChecker+Invalid, 836 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 747 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:06,376 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [240 Valid, 429 Invalid, 836 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 747 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2021-11-23 17:10:06,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11519 states. [2021-11-23 17:10:06,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11519 to 11190. [2021-11-23 17:10:06,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11190 states, 11189 states have (on average 1.0671194923585665) internal successors, (11940), 11189 states have internal predecessors, (11940), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:06,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11190 states to 11190 states and 11940 transitions. [2021-11-23 17:10:06,525 INFO L78 Accepts]: Start accepts. Automaton has 11190 states and 11940 transitions. Word has length 1038 [2021-11-23 17:10:06,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:06,526 INFO L470 AbstractCegarLoop]: Abstraction has 11190 states and 11940 transitions. [2021-11-23 17:10:06,527 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 119.0) internal successors, (357), 3 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:06,527 INFO L276 IsEmpty]: Start isEmpty. Operand 11190 states and 11940 transitions. [2021-11-23 17:10:06,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1352 [2021-11-23 17:10:06,602 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:06,604 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 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, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:10:06,611 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:06,816 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Ended with exit code 0 [2021-11-23 17:10:07,006 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:10:07,007 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:07,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:07,007 INFO L85 PathProgramCache]: Analyzing trace with hash 1061826883, now seen corresponding path program 1 times [2021-11-23 17:10:07,013 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:07,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [852922648] [2021-11-23 17:10:07,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:07,014 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:07,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:07,015 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:07,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:10:07,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:07,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 1456 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:10:07,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:10,343 INFO L134 CoverageAnalysis]: Checked inductivity of 3499 backedges. 1963 proven. 249 refuted. 0 times theorem prover too weak. 1287 trivial. 0 not checked. [2021-11-23 17:10:10,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:28,886 INFO L134 CoverageAnalysis]: Checked inductivity of 3499 backedges. 1963 proven. 249 refuted. 0 times theorem prover too weak. 1287 trivial. 0 not checked. [2021-11-23 17:10:28,886 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:28,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [852922648] [2021-11-23 17:10:28,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [852922648] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:28,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [502284748] [2021-11-23 17:10:28,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:28,887 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:10:28,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:10:28,887 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:10:28,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-23 17:10:29,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:29,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 1456 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:10:29,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:31,241 INFO L134 CoverageAnalysis]: Checked inductivity of 3499 backedges. 2391 proven. 0 refuted. 0 times theorem prover too weak. 1108 trivial. 0 not checked. [2021-11-23 17:10:31,241 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:10:31,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [502284748] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:10:31,241 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:10:31,243 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-23 17:10:31,243 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683450176] [2021-11-23 17:10:31,243 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:10:31,244 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:10:31,244 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:31,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:10:31,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:10:31,246 INFO L87 Difference]: Start difference. First operand 11190 states and 11940 transitions. Second operand has 3 states, 3 states have (on average 214.0) internal successors, (642), 3 states have internal predecessors, (642), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:36,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:36,505 INFO L93 Difference]: Finished difference Result 24352 states and 26099 transitions. [2021-11-23 17:10:36,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:10:36,512 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 214.0) internal successors, (642), 3 states have internal predecessors, (642), 0 states have call successors, (0), 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 1351 [2021-11-23 17:10:36,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:36,536 INFO L225 Difference]: With dead ends: 24352 [2021-11-23 17:10:36,536 INFO L226 Difference]: Without dead ends: 13822 [2021-11-23 17:10:36,546 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4050 GetRequests, 4045 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:10:36,547 INFO L933 BasicCegarLoop]: 431 mSDtfsCounter, 220 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 760 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 437 SdHoareTripleChecker+Invalid, 864 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 760 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:36,547 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [220 Valid, 437 Invalid, 864 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 760 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2021-11-23 17:10:36,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13822 states. [2021-11-23 17:10:36,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13822 to 13164. [2021-11-23 17:10:36,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13164 states, 13163 states have (on average 1.0441388741168427) internal successors, (13744), 13163 states have internal predecessors, (13744), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:36,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13164 states to 13164 states and 13744 transitions. [2021-11-23 17:10:36,779 INFO L78 Accepts]: Start accepts. Automaton has 13164 states and 13744 transitions. Word has length 1351 [2021-11-23 17:10:36,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:36,781 INFO L470 AbstractCegarLoop]: Abstraction has 13164 states and 13744 transitions. [2021-11-23 17:10:36,781 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 214.0) internal successors, (642), 3 states have internal predecessors, (642), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:36,781 INFO L276 IsEmpty]: Start isEmpty. Operand 13164 states and 13744 transitions. [2021-11-23 17:10:36,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1360 [2021-11-23 17:10:36,867 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:36,869 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 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, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:10:36,876 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:37,085 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Ended with exit code 0 [2021-11-23 17:10:37,272 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:10:37,272 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:37,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:37,273 INFO L85 PathProgramCache]: Analyzing trace with hash -1664510655, now seen corresponding path program 1 times [2021-11-23 17:10:37,279 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:37,279 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1052584127] [2021-11-23 17:10:37,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:37,279 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:37,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:37,280 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:37,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 17:10:37,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:37,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 1473 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:10:37,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:40,821 INFO L134 CoverageAnalysis]: Checked inductivity of 4137 backedges. 2182 proven. 249 refuted. 0 times theorem prover too weak. 1706 trivial. 0 not checked. [2021-11-23 17:10:40,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:00,238 INFO L134 CoverageAnalysis]: Checked inductivity of 4137 backedges. 2182 proven. 249 refuted. 0 times theorem prover too weak. 1706 trivial. 0 not checked. [2021-11-23 17:11:00,239 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:00,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1052584127] [2021-11-23 17:11:00,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1052584127] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:00,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [570733587] [2021-11-23 17:11:00,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:00,239 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:00,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:11:00,240 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:11:00,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-23 17:11:01,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:01,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 1473 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:11:01,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:04,924 INFO L134 CoverageAnalysis]: Checked inductivity of 4137 backedges. 1794 proven. 0 refuted. 0 times theorem prover too weak. 2343 trivial. 0 not checked. [2021-11-23 17:11:04,924 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:11:04,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [570733587] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:11:04,924 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:11:04,926 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3] total 8 [2021-11-23 17:11:04,926 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496970073] [2021-11-23 17:11:04,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:11:04,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:11:04,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:04,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:11:04,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:11:04,929 INFO L87 Difference]: Start difference. First operand 13164 states and 13744 transitions. Second operand has 4 states, 4 states have (on average 134.75) internal successors, (539), 4 states have internal predecessors, (539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:10,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:10,980 INFO L93 Difference]: Finished difference Result 26000 states and 27166 transitions. [2021-11-23 17:11:10,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:11:10,986 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 134.75) internal successors, (539), 4 states have internal predecessors, (539), 0 states have call successors, (0), 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 1359 [2021-11-23 17:11:10,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:11,003 INFO L225 Difference]: With dead ends: 26000 [2021-11-23 17:11:11,004 INFO L226 Difference]: Without dead ends: 13167 [2021-11-23 17:11:11,012 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4074 GetRequests, 4068 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:11:11,013 INFO L933 BasicCegarLoop]: 440 mSDtfsCounter, 162 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 1358 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 453 SdHoareTripleChecker+Invalid, 1382 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 1358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:11,014 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [162 Valid, 453 Invalid, 1382 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 1358 Invalid, 0 Unknown, 0 Unchecked, 5.9s Time] [2021-11-23 17:11:11,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13167 states. [2021-11-23 17:11:11,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13167 to 13164. [2021-11-23 17:11:11,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13164 states, 13163 states have (on average 1.0428473752184153) internal successors, (13727), 13163 states have internal predecessors, (13727), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:11,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13164 states to 13164 states and 13727 transitions. [2021-11-23 17:11:11,208 INFO L78 Accepts]: Start accepts. Automaton has 13164 states and 13727 transitions. Word has length 1359 [2021-11-23 17:11:11,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:11,210 INFO L470 AbstractCegarLoop]: Abstraction has 13164 states and 13727 transitions. [2021-11-23 17:11:11,210 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 134.75) internal successors, (539), 4 states have internal predecessors, (539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:11,210 INFO L276 IsEmpty]: Start isEmpty. Operand 13164 states and 13727 transitions. [2021-11-23 17:11:11,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1473 [2021-11-23 17:11:11,285 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:11,286 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:11:11,309 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:11,501 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:11,695 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:11,695 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:11,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:11,696 INFO L85 PathProgramCache]: Analyzing trace with hash 832565084, now seen corresponding path program 1 times [2021-11-23 17:11:11,702 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:11,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [725325620] [2021-11-23 17:11:11,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:11,703 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:11,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:11,705 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:11,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 17:11:12,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:12,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 1575 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:11:12,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:15,545 INFO L134 CoverageAnalysis]: Checked inductivity of 3945 backedges. 2202 proven. 249 refuted. 0 times theorem prover too weak. 1494 trivial. 0 not checked. [2021-11-23 17:11:15,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:35,692 INFO L134 CoverageAnalysis]: Checked inductivity of 3945 backedges. 2202 proven. 249 refuted. 0 times theorem prover too weak. 1494 trivial. 0 not checked. [2021-11-23 17:11:35,692 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:35,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [725325620] [2021-11-23 17:11:35,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [725325620] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:35,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1388314198] [2021-11-23 17:11:35,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:35,692 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:35,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:11:35,694 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:11:35,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-23 17:11:36,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:36,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 1575 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:11:36,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:43,676 INFO L134 CoverageAnalysis]: Checked inductivity of 3945 backedges. 2690 proven. 0 refuted. 0 times theorem prover too weak. 1255 trivial. 0 not checked. [2021-11-23 17:11:43,676 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:11:43,677 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1388314198] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:11:43,677 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:11:43,678 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [3, 3] total 9 [2021-11-23 17:11:43,678 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337780528] [2021-11-23 17:11:43,678 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:11:43,679 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:11:43,679 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:43,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:11:43,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:11:43,688 INFO L87 Difference]: Start difference. First operand 13164 states and 13727 transitions. Second operand has 5 states, 5 states have (on average 152.6) internal successors, (763), 5 states have internal predecessors, (763), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:49,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:49,825 INFO L93 Difference]: Finished difference Result 25671 states and 26793 transitions. [2021-11-23 17:11:49,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:11:49,832 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 152.6) internal successors, (763), 5 states have internal predecessors, (763), 0 states have call successors, (0), 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 1472 [2021-11-23 17:11:49,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:49,843 INFO L225 Difference]: With dead ends: 25671 [2021-11-23 17:11:49,843 INFO L226 Difference]: Without dead ends: 13167 [2021-11-23 17:11:49,848 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4413 GetRequests, 4406 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:11:49,849 INFO L933 BasicCegarLoop]: 434 mSDtfsCounter, 261 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 1796 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 452 SdHoareTripleChecker+Invalid, 1805 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1796 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:49,849 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [261 Valid, 452 Invalid, 1805 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1796 Invalid, 0 Unknown, 0 Unchecked, 6.0s Time] [2021-11-23 17:11:49,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13167 states. [2021-11-23 17:11:50,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13167 to 13164. [2021-11-23 17:11:50,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13164 states, 13163 states have (on average 1.0426954341715415) internal successors, (13725), 13163 states have internal predecessors, (13725), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:50,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13164 states to 13164 states and 13725 transitions. [2021-11-23 17:11:50,136 INFO L78 Accepts]: Start accepts. Automaton has 13164 states and 13725 transitions. Word has length 1472 [2021-11-23 17:11:50,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:50,138 INFO L470 AbstractCegarLoop]: Abstraction has 13164 states and 13725 transitions. [2021-11-23 17:11:50,138 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 152.6) internal successors, (763), 5 states have internal predecessors, (763), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:50,138 INFO L276 IsEmpty]: Start isEmpty. Operand 13164 states and 13725 transitions. [2021-11-23 17:11:50,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1643 [2021-11-23 17:11:50,175 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:50,176 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 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, 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, 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] [2021-11-23 17:11:50,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:50,399 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Ended with exit code 0 [2021-11-23 17:11:50,596 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:50,597 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:50,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:50,598 INFO L85 PathProgramCache]: Analyzing trace with hash -1250931939, now seen corresponding path program 1 times [2021-11-23 17:11:50,609 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:50,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1575375591] [2021-11-23 17:11:50,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:50,610 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:50,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:50,611 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:50,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 17:11:51,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:51,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 1764 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:11:51,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:54,822 INFO L134 CoverageAnalysis]: Checked inductivity of 5373 backedges. 2717 proven. 249 refuted. 0 times theorem prover too weak. 2407 trivial. 0 not checked. [2021-11-23 17:11:54,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:14,163 INFO L134 CoverageAnalysis]: Checked inductivity of 5373 backedges. 2717 proven. 249 refuted. 0 times theorem prover too weak. 2407 trivial. 0 not checked. [2021-11-23 17:12:14,163 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:12:14,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1575375591] [2021-11-23 17:12:14,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1575375591] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:14,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [509020796] [2021-11-23 17:12:14,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:14,164 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:12:14,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:12:14,164 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:12:14,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-11-23 17:12:14,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:14,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 1764 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:12:14,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:16,701 INFO L134 CoverageAnalysis]: Checked inductivity of 5373 backedges. 169 proven. 0 refuted. 0 times theorem prover too weak. 5204 trivial. 0 not checked. [2021-11-23 17:12:16,701 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:12:16,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [509020796] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:12:16,701 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:12:16,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-23 17:12:16,704 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513599074] [2021-11-23 17:12:16,704 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:12:16,705 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:12:16,706 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:12:16,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:12:16,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:12:16,707 INFO L87 Difference]: Start difference. First operand 13164 states and 13725 transitions. Second operand has 3 states, 3 states have (on average 99.33333333333333) internal successors, (298), 3 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:12:22,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:12:22,138 INFO L93 Difference]: Finished difference Result 26326 states and 27477 transitions. [2021-11-23 17:12:22,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:12:22,147 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 99.33333333333333) internal successors, (298), 3 states have internal predecessors, (298), 0 states have call successors, (0), 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 1642 [2021-11-23 17:12:22,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:12:22,193 INFO L225 Difference]: With dead ends: 26326 [2021-11-23 17:12:22,194 INFO L226 Difference]: Without dead ends: 12835 [2021-11-23 17:12:22,198 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4923 GetRequests, 4918 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:12:22,199 INFO L933 BasicCegarLoop]: 415 mSDtfsCounter, 318 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 771 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 318 SdHoareTripleChecker+Valid, 421 SdHoareTripleChecker+Invalid, 833 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 771 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:12:22,199 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [318 Valid, 421 Invalid, 833 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 771 Invalid, 0 Unknown, 0 Unchecked, 5.3s Time] [2021-11-23 17:12:22,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12835 states. [2021-11-23 17:12:22,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12835 to 12506. [2021-11-23 17:12:22,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12506 states, 12505 states have (on average 1.0391043582566972) internal successors, (12994), 12505 states have internal predecessors, (12994), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:12:22,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12506 states to 12506 states and 12994 transitions. [2021-11-23 17:12:22,381 INFO L78 Accepts]: Start accepts. Automaton has 12506 states and 12994 transitions. Word has length 1642 [2021-11-23 17:12:22,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:12:22,383 INFO L470 AbstractCegarLoop]: Abstraction has 12506 states and 12994 transitions. [2021-11-23 17:12:22,383 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 99.33333333333333) internal successors, (298), 3 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:12:22,383 INFO L276 IsEmpty]: Start isEmpty. Operand 12506 states and 12994 transitions. [2021-11-23 17:12:22,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1726 [2021-11-23 17:12:22,480 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:12:22,481 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 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, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:12:22,491 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:22,701 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Ended with exit code 0 [2021-11-23 17:12:22,886 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:12:22,886 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:12:22,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:12:22,887 INFO L85 PathProgramCache]: Analyzing trace with hash 754322317, now seen corresponding path program 1 times [2021-11-23 17:12:22,894 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:12:22,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [751197632] [2021-11-23 17:12:22,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:22,894 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:12:22,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:12:22,897 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:12:22,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 17:12:23,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:23,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 1857 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:12:23,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:27,263 INFO L134 CoverageAnalysis]: Checked inductivity of 6186 backedges. 2965 proven. 249 refuted. 0 times theorem prover too weak. 2972 trivial. 0 not checked. [2021-11-23 17:12:27,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:47,839 INFO L134 CoverageAnalysis]: Checked inductivity of 6186 backedges. 2965 proven. 249 refuted. 0 times theorem prover too weak. 2972 trivial. 0 not checked. [2021-11-23 17:12:47,839 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:12:47,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [751197632] [2021-11-23 17:12:47,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [751197632] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:47,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1091609302] [2021-11-23 17:12:47,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:47,840 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:12:47,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:12:47,841 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:12:47,842 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-23 17:12:48,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:48,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 1857 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:12:48,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:52,361 INFO L134 CoverageAnalysis]: Checked inductivity of 6186 backedges. 982 proven. 0 refuted. 0 times theorem prover too weak. 5204 trivial. 0 not checked. [2021-11-23 17:12:52,361 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:12:52,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1091609302] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:12:52,361 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:12:52,363 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3] total 11 [2021-11-23 17:12:52,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418329585] [2021-11-23 17:12:52,364 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:12:52,365 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:12:52,365 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:12:52,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:12:52,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:12:52,366 INFO L87 Difference]: Start difference. First operand 12506 states and 12994 transitions. Second operand has 7 states, 7 states have (on average 54.42857142857143) internal successors, (381), 7 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:12:58,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:12:58,962 INFO L93 Difference]: Finished difference Result 25082 states and 26069 transitions. [2021-11-23 17:12:58,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 17:12:58,963 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 54.42857142857143) internal successors, (381), 7 states have internal predecessors, (381), 0 states have call successors, (0), 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 1725 [2021-11-23 17:12:58,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:12:58,972 INFO L225 Difference]: With dead ends: 25082 [2021-11-23 17:12:58,972 INFO L226 Difference]: Without dead ends: 12177 [2021-11-23 17:12:58,976 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5174 GetRequests, 5164 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-23 17:12:58,977 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 1080 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 1520 mSolverCounterSat, 187 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1080 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 1707 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 187 IncrementalHoareTripleChecker+Valid, 1520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:12:58,978 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1080 Valid, 43 Invalid, 1707 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [187 Valid, 1520 Invalid, 0 Unknown, 0 Unchecked, 6.4s Time] [2021-11-23 17:12:58,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12177 states. [2021-11-23 17:12:59,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12177 to 11519. [2021-11-23 17:12:59,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11519 states, 11518 states have (on average 1.0303003993748914) internal successors, (11867), 11518 states have internal predecessors, (11867), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:12:59,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11519 states to 11519 states and 11867 transitions. [2021-11-23 17:12:59,162 INFO L78 Accepts]: Start accepts. Automaton has 11519 states and 11867 transitions. Word has length 1725 [2021-11-23 17:12:59,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:12:59,164 INFO L470 AbstractCegarLoop]: Abstraction has 11519 states and 11867 transitions. [2021-11-23 17:12:59,164 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 54.42857142857143) internal successors, (381), 7 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:12:59,165 INFO L276 IsEmpty]: Start isEmpty. Operand 11519 states and 11867 transitions. [2021-11-23 17:12:59,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1861 [2021-11-23 17:12:59,267 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:12:59,269 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 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, 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, 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, 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, 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] [2021-11-23 17:12:59,291 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Ended with exit code 0 [2021-11-23 17:12:59,477 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:59,673 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:12:59,673 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:12:59,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:12:59,674 INFO L85 PathProgramCache]: Analyzing trace with hash -1139740635, now seen corresponding path program 1 times [2021-11-23 17:12:59,684 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:12:59,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [739186575] [2021-11-23 17:12:59,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:59,685 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:12:59,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:12:59,685 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:12:59,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-23 17:13:00,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:00,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 1984 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:13:00,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:04,506 INFO L134 CoverageAnalysis]: Checked inductivity of 6087 backedges. 3005 proven. 249 refuted. 0 times theorem prover too weak. 2833 trivial. 0 not checked. [2021-11-23 17:13:04,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:25,810 INFO L134 CoverageAnalysis]: Checked inductivity of 6087 backedges. 3005 proven. 249 refuted. 0 times theorem prover too weak. 2833 trivial. 0 not checked. [2021-11-23 17:13:25,810 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:13:25,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [739186575] [2021-11-23 17:13:25,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [739186575] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:25,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1920634876] [2021-11-23 17:13:25,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:25,811 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:13:25,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:13:25,812 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:13:25,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-11-23 17:13:27,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:27,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 1984 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:13:27,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:31,532 INFO L134 CoverageAnalysis]: Checked inductivity of 6087 backedges. 3353 proven. 776 refuted. 0 times theorem prover too weak. 1958 trivial. 0 not checked. [2021-11-23 17:13:31,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:49,831 INFO L134 CoverageAnalysis]: Checked inductivity of 6087 backedges. 3353 proven. 776 refuted. 0 times theorem prover too weak. 1958 trivial. 0 not checked. [2021-11-23 17:13:49,831 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1920634876] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:49,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857392697] [2021-11-23 17:13:49,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:49,832 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:13:49,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:13:49,833 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:13:49,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-23 17:13:50,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:50,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 1984 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 17:13:50,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:58,576 INFO L134 CoverageAnalysis]: Checked inductivity of 6087 backedges. 3005 proven. 249 refuted. 0 times theorem prover too weak. 2833 trivial. 0 not checked. [2021-11-23 17:13:58,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:15,784 INFO L134 CoverageAnalysis]: Checked inductivity of 6087 backedges. 3538 proven. 376 refuted. 0 times theorem prover too weak. 2173 trivial. 0 not checked. [2021-11-23 17:14:15,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1857392697] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:15,784 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:14:15,787 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 5, 5, 4, 8] total 17 [2021-11-23 17:14:15,788 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173874488] [2021-11-23 17:14:15,788 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:14:15,793 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 17:14:15,793 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:15,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 17:14:15,794 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:14:15,794 INFO L87 Difference]: Start difference. First operand 11519 states and 11867 transitions. Second operand has 17 states, 17 states have (on average 136.35294117647058) internal successors, (2318), 17 states have internal predecessors, (2318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:52,503 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.45s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:14:55,209 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.80s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:15:17,025 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:15:18,647 WARN L534 Checker$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 17:16:14,175 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.19s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:16:28,192 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.42s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:16:30,219 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:16:33,074 WARN L534 Checker$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 17:16:44,255 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:16:47,590 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.49s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:17:21,246 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.72s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:17:33,502 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.80s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:17:54,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:54,930 INFO L93 Difference]: Finished difference Result 29125 states and 29961 transitions. [2021-11-23 17:17:54,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 17:17:54,937 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 136.35294117647058) internal successors, (2318), 17 states have internal predecessors, (2318), 0 states have call successors, (0), 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 1860 [2021-11-23 17:17:54,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:54,951 INFO L225 Difference]: With dead ends: 29125 [2021-11-23 17:17:54,951 INFO L226 Difference]: Without dead ends: 18266 [2021-11-23 17:17:54,958 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11207 GetRequests, 11165 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=456, Invalid=1436, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:17:54,959 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 5375 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 9607 mSolverCounterSat, 1264 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 197.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5375 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 10873 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1264 IncrementalHoareTripleChecker+Valid, 9607 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 213.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:54,959 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5375 Valid, 139 Invalid, 10873 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1264 Valid, 9607 Invalid, 2 Unknown, 0 Unchecked, 213.3s Time] [2021-11-23 17:17:54,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18266 states. [2021-11-23 17:17:55,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18266 to 12506. [2021-11-23 17:17:55,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12506 states, 12505 states have (on average 1.0282287085165933) internal successors, (12858), 12505 states have internal predecessors, (12858), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:55,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12506 states to 12506 states and 12858 transitions. [2021-11-23 17:17:55,177 INFO L78 Accepts]: Start accepts. Automaton has 12506 states and 12858 transitions. Word has length 1860 [2021-11-23 17:17:55,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:55,178 INFO L470 AbstractCegarLoop]: Abstraction has 12506 states and 12858 transitions. [2021-11-23 17:17:55,178 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 136.35294117647058) internal successors, (2318), 17 states have internal predecessors, (2318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:55,178 INFO L276 IsEmpty]: Start isEmpty. Operand 12506 states and 12858 transitions. [2021-11-23 17:17:55,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1904 [2021-11-23 17:17:55,208 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:55,209 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 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, 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, 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, 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] [2021-11-23 17:17:55,224 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (35)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:55,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:55,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:55,824 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:17:55,824 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:55,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:55,826 INFO L85 PathProgramCache]: Analyzing trace with hash 221348724, now seen corresponding path program 1 times [2021-11-23 17:17:55,835 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:55,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [357946821] [2021-11-23 17:17:55,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:55,836 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:55,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:55,837 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:55,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-23 17:17:56,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:56,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 2035 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:17:56,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:00,947 INFO L134 CoverageAnalysis]: Checked inductivity of 6758 backedges. 3634 proven. 1450 refuted. 0 times theorem prover too weak. 1674 trivial. 0 not checked. [2021-11-23 17:18:00,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:38,770 INFO L134 CoverageAnalysis]: Checked inductivity of 6758 backedges. 4325 proven. 66 refuted. 0 times theorem prover too weak. 2367 trivial. 0 not checked. [2021-11-23 17:18:38,770 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:38,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [357946821] [2021-11-23 17:18:38,770 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [357946821] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:38,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1671978551] [2021-11-23 17:18:38,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:38,771 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:38,771 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:38,772 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:38,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f89ce00-64c7-4bc8-83a5-302ab4a34eee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-23 17:18:40,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:40,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 2035 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 17:18:41,006 INFO L286 TraceCheckSpWp]: Computing forward predicates...