./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-simple/deep-nested.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-simple/deep-nested.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P --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 abddf9ff39262b7e56b56d5272c2d316261bfefbe98fc5849d87d962ab5f7694 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:26:16,555 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:26:16,558 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:26:16,601 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:26:16,602 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:26:16,603 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:26:16,604 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:26:16,607 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:26:16,609 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:26:16,610 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:26:16,611 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:26:16,613 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:26:16,613 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:26:16,615 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:26:16,616 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:26:16,618 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:26:16,619 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:26:16,620 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:26:16,623 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:26:16,625 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:26:16,627 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:26:16,629 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:26:16,637 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:26:16,639 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:26:16,644 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:26:16,654 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:26:16,655 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:26:16,656 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:26:16,657 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:26:16,658 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:26:16,658 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:26:16,662 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:26:16,664 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:26:16,665 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:26:16,666 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:26:16,668 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:26:16,669 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:26:16,670 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:26:16,670 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:26:16,671 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:26:16,672 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:26:16,673 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:26:16,707 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:26:16,707 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:26:16,708 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:26:16,708 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:26:16,718 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:26:16,718 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:26:16,718 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:26:16,718 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:26:16,719 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:26:16,719 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:26:16,719 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:26:16,719 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:26:16,719 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:26:16,720 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:26:16,720 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:26:16,720 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:26:16,720 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:26:16,720 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:26:16,721 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:26:16,721 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:26:16,722 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:26:16,722 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:26:16,722 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:26:16,722 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:26:16,722 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:26:16,723 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:26:16,723 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:26:16,723 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:26:16,723 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:26:16,724 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:26:16,724 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:26:16,724 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:26:16,724 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:26:16,725 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:26:16,725 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:26:16,725 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:26:16,725 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:26:16,725 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:26:16,726 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:26:16,726 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:26:16,726 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:26:16,726 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_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> abddf9ff39262b7e56b56d5272c2d316261bfefbe98fc5849d87d962ab5f7694 [2021-11-21 01:26:16,974 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:26:16,995 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:26:16,997 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:26:16,998 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:26:16,998 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:26:17,000 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/loop-simple/deep-nested.c [2021-11-21 01:26:17,063 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/data/4b28054fb/5e592995c33f45ab962934d7626affd4/FLAG57e579952 [2021-11-21 01:26:17,600 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:26:17,600 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/sv-benchmarks/c/loop-simple/deep-nested.c [2021-11-21 01:26:17,611 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/data/4b28054fb/5e592995c33f45ab962934d7626affd4/FLAG57e579952 [2021-11-21 01:26:17,965 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/data/4b28054fb/5e592995c33f45ab962934d7626affd4 [2021-11-21 01:26:17,968 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:26:17,969 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:26:17,971 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:26:17,971 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:26:17,975 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:26:17,976 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:26:17" (1/1) ... [2021-11-21 01:26:17,977 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@21859907 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:17, skipping insertion in model container [2021-11-21 01:26:17,977 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:26:17" (1/1) ... [2021-11-21 01:26:17,984 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:26:17,997 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:26:18,148 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_e6b72094-4a92-4603-9ce3-e3303d76ea53/sv-benchmarks/c/loop-simple/deep-nested.c[625,638] [2021-11-21 01:26:18,154 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:26:18,194 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:26:18,211 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_e6b72094-4a92-4603-9ce3-e3303d76ea53/sv-benchmarks/c/loop-simple/deep-nested.c[625,638] [2021-11-21 01:26:18,212 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:26:18,224 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:26:18,225 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:18 WrapperNode [2021-11-21 01:26:18,225 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:26:18,226 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:26:18,226 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:26:18,227 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:26:18,234 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:18" (1/1) ... [2021-11-21 01:26:18,241 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:18" (1/1) ... [2021-11-21 01:26:18,260 INFO L137 Inliner]: procedures = 10, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 61 [2021-11-21 01:26:18,260 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:26:18,261 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:26:18,261 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:26:18,261 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:26:18,269 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:18" (1/1) ... [2021-11-21 01:26:18,270 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:18" (1/1) ... [2021-11-21 01:26:18,271 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:18" (1/1) ... [2021-11-21 01:26:18,271 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:18" (1/1) ... [2021-11-21 01:26:18,275 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:18" (1/1) ... [2021-11-21 01:26:18,279 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:18" (1/1) ... [2021-11-21 01:26:18,280 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:18" (1/1) ... [2021-11-21 01:26:18,282 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:26:18,283 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:26:18,283 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:26:18,283 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:26:18,284 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:18" (1/1) ... [2021-11-21 01:26:18,293 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:26:18,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:18,319 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:26:18,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:26:18,359 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:26:18,359 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:26:18,359 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:26:18,359 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:26:18,424 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:26:18,426 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:26:18,554 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:26:18,587 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:26:18,587 INFO L301 CfgBuilder]: Removed 5 assume(true) statements. [2021-11-21 01:26:18,590 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:26:18 BoogieIcfgContainer [2021-11-21 01:26:18,590 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:26:18,592 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:26:18,592 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:26:18,612 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:26:18,612 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:26:17" (1/3) ... [2021-11-21 01:26:18,613 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@485d7a71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:26:18, skipping insertion in model container [2021-11-21 01:26:18,613 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:18" (2/3) ... [2021-11-21 01:26:18,614 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@485d7a71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:26:18, skipping insertion in model container [2021-11-21 01:26:18,614 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:26:18" (3/3) ... [2021-11-21 01:26:18,615 INFO L111 eAbstractionObserver]: Analyzing ICFG deep-nested.c [2021-11-21 01:26:18,620 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:26:18,621 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:26:18,701 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:26:18,708 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 [2021-11-21 01:26:18,709 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:26:18,722 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 10 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:18,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 01:26:18,727 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:18,728 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:26:18,728 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:18,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:18,734 INFO L85 PathProgramCache]: Analyzing trace with hash 879794961, now seen corresponding path program 1 times [2021-11-21 01:26:18,742 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:18,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913573222] [2021-11-21 01:26:18,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:18,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:18,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:19,084 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:26:19,085 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:19,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913573222] [2021-11-21 01:26:19,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [913573222] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:26:19,086 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:26:19,087 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:26:19,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102558120] [2021-11-21 01:26:19,089 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:26:19,093 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:26:19,093 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:19,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:26:19,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:26:19,124 INFO L87 Difference]: Start difference. First operand has 11 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 10 states have internal predecessors, (16), 0 states have call successors, (0), 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 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:19,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:19,234 INFO L93 Difference]: Finished difference Result 24 states and 36 transitions. [2021-11-21 01:26:19,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:26:19,236 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 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 8 [2021-11-21 01:26:19,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:19,246 INFO L225 Difference]: With dead ends: 24 [2021-11-21 01:26:19,246 INFO L226 Difference]: Without dead ends: 13 [2021-11-21 01:26:19,254 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:26:19,264 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 14 mSDsluCounter, 1 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 2 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:19,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 2 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:26:19,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-21 01:26:19,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2021-11-21 01:26:19,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:19,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 16 transitions. [2021-11-21 01:26:19,306 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 16 transitions. Word has length 8 [2021-11-21 01:26:19,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:19,307 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 16 transitions. [2021-11-21 01:26:19,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:19,308 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 16 transitions. [2021-11-21 01:26:19,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 01:26:19,308 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:19,309 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:26:19,309 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:26:19,310 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:19,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:19,314 INFO L85 PathProgramCache]: Analyzing trace with hash 2085127801, now seen corresponding path program 1 times [2021-11-21 01:26:19,314 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:19,315 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879630365] [2021-11-21 01:26:19,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:19,316 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:19,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:19,658 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:26:19,659 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:19,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [879630365] [2021-11-21 01:26:19,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [879630365] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:26:19,659 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:26:19,660 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:26:19,660 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960345542] [2021-11-21 01:26:19,660 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:26:19,661 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:26:19,662 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:19,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:26:19,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:26:19,663 INFO L87 Difference]: Start difference. First operand 12 states and 16 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:19,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:19,714 INFO L93 Difference]: Finished difference Result 23 states and 31 transitions. [2021-11-21 01:26:19,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:26:19,715 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 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 11 [2021-11-21 01:26:19,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:19,716 INFO L225 Difference]: With dead ends: 23 [2021-11-21 01:26:19,716 INFO L226 Difference]: Without dead ends: 21 [2021-11-21 01:26:19,717 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:26:19,718 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:19,719 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 5 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:26:19,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-21 01:26:19,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-11-21 01:26:19,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:19,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 28 transitions. [2021-11-21 01:26:19,726 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 28 transitions. Word has length 11 [2021-11-21 01:26:19,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:19,726 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 28 transitions. [2021-11-21 01:26:19,727 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:19,727 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 28 transitions. [2021-11-21 01:26:19,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-21 01:26:19,728 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:19,728 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:26:19,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 01:26:19,728 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:19,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:19,729 INFO L85 PathProgramCache]: Analyzing trace with hash 1421280196, now seen corresponding path program 1 times [2021-11-21 01:26:19,729 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:19,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236403586] [2021-11-21 01:26:19,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:19,730 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:19,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:19,892 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:26:19,893 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:19,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236403586] [2021-11-21 01:26:19,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [236403586] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:26:19,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [752525877] [2021-11-21 01:26:19,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:19,896 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:19,896 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:19,933 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:26:19,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:26:19,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:19,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:26:19,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:26:20,069 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:26:20,069 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:26:20,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [752525877] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:26:20,070 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:26:20,070 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 7 [2021-11-21 01:26:20,070 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257963837] [2021-11-21 01:26:20,071 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:26:20,071 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:26:20,071 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:20,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:26:20,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-21 01:26:20,072 INFO L87 Difference]: Start difference. First operand 20 states and 28 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:20,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:20,143 INFO L93 Difference]: Finished difference Result 48 states and 68 transitions. [2021-11-21 01:26:20,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:26:20,144 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 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 13 [2021-11-21 01:26:20,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:20,145 INFO L225 Difference]: With dead ends: 48 [2021-11-21 01:26:20,145 INFO L226 Difference]: Without dead ends: 37 [2021-11-21 01:26:20,146 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:26:20,147 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 36 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:20,148 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 6 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:26:20,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-21 01:26:20,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 22. [2021-11-21 01:26:20,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 21 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:20,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 30 transitions. [2021-11-21 01:26:20,156 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 30 transitions. Word has length 13 [2021-11-21 01:26:20,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:20,157 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 30 transitions. [2021-11-21 01:26:20,157 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:20,157 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 30 transitions. [2021-11-21 01:26:20,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-21 01:26:20,158 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:20,158 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:26:20,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:26:20,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:20,380 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:20,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:20,381 INFO L85 PathProgramCache]: Analyzing trace with hash 1913796903, now seen corresponding path program 1 times [2021-11-21 01:26:20,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:20,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1490557025] [2021-11-21 01:26:20,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:20,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:20,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:20,528 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:26:20,528 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:20,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1490557025] [2021-11-21 01:26:20,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1490557025] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:26:20,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740003456] [2021-11-21 01:26:20,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:20,530 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:20,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:20,537 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:26:20,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:26:20,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:20,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:26:20,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:26:20,681 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 01:26:20,682 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:26:20,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1740003456] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:26:20,682 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:26:20,683 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 8 [2021-11-21 01:26:20,683 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315752765] [2021-11-21 01:26:20,683 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:26:20,684 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:26:20,687 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:20,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:26:20,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:26:20,689 INFO L87 Difference]: Start difference. First operand 22 states and 30 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:20,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:20,796 INFO L93 Difference]: Finished difference Result 56 states and 78 transitions. [2021-11-21 01:26:20,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:26:20,797 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 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 15 [2021-11-21 01:26:20,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:20,798 INFO L225 Difference]: With dead ends: 56 [2021-11-21 01:26:20,798 INFO L226 Difference]: Without dead ends: 37 [2021-11-21 01:26:20,799 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-21 01:26:20,800 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 66 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:20,800 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 6 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:26:20,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-21 01:26:20,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 24. [2021-11-21 01:26:20,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:20,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2021-11-21 01:26:20,807 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 15 [2021-11-21 01:26:20,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:20,808 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2021-11-21 01:26:20,808 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:20,808 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2021-11-21 01:26:20,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-21 01:26:20,809 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:20,809 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:26:20,853 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:26:21,037 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:21,037 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:21,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:21,038 INFO L85 PathProgramCache]: Analyzing trace with hash -1798734434, now seen corresponding path program 1 times [2021-11-21 01:26:21,038 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:21,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1390696576] [2021-11-21 01:26:21,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:21,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:21,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:21,193 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 01:26:21,193 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:21,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1390696576] [2021-11-21 01:26:21,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1390696576] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:26:21,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016934524] [2021-11-21 01:26:21,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:21,193 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:21,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:21,194 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:26:21,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:26:21,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:21,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:26:21,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:26:21,334 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:26:21,334 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:26:21,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016934524] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:26:21,335 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:26:21,335 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 8 [2021-11-21 01:26:21,335 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565931364] [2021-11-21 01:26:21,336 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:26:21,336 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:26:21,336 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:21,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:26:21,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:26:21,339 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:21,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:21,427 INFO L93 Difference]: Finished difference Result 58 states and 78 transitions. [2021-11-21 01:26:21,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:26:21,428 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 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 17 [2021-11-21 01:26:21,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:21,429 INFO L225 Difference]: With dead ends: 58 [2021-11-21 01:26:21,429 INFO L226 Difference]: Without dead ends: 37 [2021-11-21 01:26:21,429 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-21 01:26:21,430 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 44 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:21,431 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 6 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:26:21,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-21 01:26:21,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 26. [2021-11-21 01:26:21,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.36) internal successors, (34), 25 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:21,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2021-11-21 01:26:21,438 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 17 [2021-11-21 01:26:21,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:21,439 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2021-11-21 01:26:21,439 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:21,439 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2021-11-21 01:26:21,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-21 01:26:21,440 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:21,440 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:26:21,467 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:26:21,655 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:21,655 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:21,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:21,656 INFO L85 PathProgramCache]: Analyzing trace with hash -1475056415, now seen corresponding path program 1 times [2021-11-21 01:26:21,656 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:21,656 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [677659482] [2021-11-21 01:26:21,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:21,656 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:21,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:21,911 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:26:21,911 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:21,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [677659482] [2021-11-21 01:26:21,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [677659482] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:26:21,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [998251730] [2021-11-21 01:26:21,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:21,912 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:21,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:21,913 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:26:21,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:26:21,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:21,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:26:21,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:26:22,127 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 01:26:22,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:26:22,308 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 01:26:22,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [998251730] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:26:22,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [696644457] [2021-11-21 01:26:22,337 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 01:26:22,337 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:26:22,344 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:26:22,350 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:26:22,350 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:26:36,158 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:26:36,794 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:26:36,794 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:26:36,794 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 14 [2021-11-21 01:26:36,795 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822894338] [2021-11-21 01:26:36,795 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:26:36,795 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-21 01:26:36,795 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:36,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-21 01:26:36,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:26:36,796 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 14 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:38,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:38,479 INFO L93 Difference]: Finished difference Result 134 states and 191 transitions. [2021-11-21 01:26:38,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-21 01:26:38,480 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 14 states have internal predecessors, (55), 0 states have call successors, (0), 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 22 [2021-11-21 01:26:38,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:38,481 INFO L225 Difference]: With dead ends: 134 [2021-11-21 01:26:38,481 INFO L226 Difference]: Without dead ends: 90 [2021-11-21 01:26:38,483 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 48 SyntacticMatches, 4 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 671 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=471, Invalid=1979, Unknown=0, NotChecked=0, Total=2450 [2021-11-21 01:26:38,484 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 319 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 319 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:38,484 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [319 Valid, 5 Invalid, 299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:26:38,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-21 01:26:38,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 57. [2021-11-21 01:26:38,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.2857142857142858) internal successors, (72), 56 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:38,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 72 transitions. [2021-11-21 01:26:38,499 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 72 transitions. Word has length 22 [2021-11-21 01:26:38,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:38,499 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 72 transitions. [2021-11-21 01:26:38,499 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 14 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:38,499 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 72 transitions. [2021-11-21 01:26:38,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-21 01:26:38,501 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:38,501 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1] [2021-11-21 01:26:38,538 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:26:38,717 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:38,717 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:38,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:38,717 INFO L85 PathProgramCache]: Analyzing trace with hash 868760348, now seen corresponding path program 2 times [2021-11-21 01:26:38,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:38,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [316575510] [2021-11-21 01:26:38,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:38,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:38,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:38,958 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 12 proven. 45 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 01:26:38,958 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:38,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [316575510] [2021-11-21 01:26:38,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [316575510] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:26:38,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [414097849] [2021-11-21 01:26:38,965 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:26:38,965 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:38,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:38,966 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:26:38,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:26:39,004 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2021-11-21 01:26:39,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:26:39,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:26:39,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:26:39,176 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2021-11-21 01:26:39,176 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:26:39,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [414097849] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:26:39,176 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:26:39,177 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [7] total 9 [2021-11-21 01:26:39,177 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70466405] [2021-11-21 01:26:39,177 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:26:39,177 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:26:39,178 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:39,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:26:39,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:26:39,179 INFO L87 Difference]: Start difference. First operand 57 states and 72 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 3 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:39,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:39,250 INFO L93 Difference]: Finished difference Result 97 states and 121 transitions. [2021-11-21 01:26:39,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:26:39,251 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 3 states have internal predecessors, (20), 0 states have call successors, (0), 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 40 [2021-11-21 01:26:39,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:39,252 INFO L225 Difference]: With dead ends: 97 [2021-11-21 01:26:39,252 INFO L226 Difference]: Without dead ends: 95 [2021-11-21 01:26:39,253 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:26:39,253 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 3 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:39,254 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 4 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:26:39,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-21 01:26:39,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 75. [2021-11-21 01:26:39,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2702702702702702) internal successors, (94), 74 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:39,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 94 transitions. [2021-11-21 01:26:39,271 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 94 transitions. Word has length 40 [2021-11-21 01:26:39,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:39,271 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 94 transitions. [2021-11-21 01:26:39,272 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 3 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:39,272 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 94 transitions. [2021-11-21 01:26:39,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-21 01:26:39,273 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:39,273 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2021-11-21 01:26:39,311 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:26:39,501 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:39,501 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:39,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:39,501 INFO L85 PathProgramCache]: Analyzing trace with hash -208931846, now seen corresponding path program 3 times [2021-11-21 01:26:39,502 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:39,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232622912] [2021-11-21 01:26:39,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:39,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:39,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:39,728 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 15 proven. 64 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-21 01:26:39,728 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:39,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232622912] [2021-11-21 01:26:39,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1232622912] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:26:39,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [150613923] [2021-11-21 01:26:39,729 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:26:39,729 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:39,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:39,731 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:26:39,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:26:39,778 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:26:39,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:26:39,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 01:26:39,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:26:39,993 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 98 proven. 20 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-21 01:26:39,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:26:40,231 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 91 proven. 27 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-21 01:26:40,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [150613923] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:26:40,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1935348633] [2021-11-21 01:26:40,234 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 01:26:40,234 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:26:40,234 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:26:40,234 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:26:40,235 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:26:48,539 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:26:49,140 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:26:49,140 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:26:49,140 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9] total 21 [2021-11-21 01:26:49,140 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901492462] [2021-11-21 01:26:49,141 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:26:49,141 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-21 01:26:49,141 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:49,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-21 01:26:49,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=695, Unknown=0, NotChecked=0, Total=812 [2021-11-21 01:26:49,143 INFO L87 Difference]: Start difference. First operand 75 states and 94 transitions. Second operand has 21 states, 21 states have (on average 3.4761904761904763) internal successors, (73), 21 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:49,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:49,638 INFO L93 Difference]: Finished difference Result 223 states and 301 transitions. [2021-11-21 01:26:49,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 01:26:49,638 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.4761904761904763) internal successors, (73), 21 states have internal predecessors, (73), 0 states have call successors, (0), 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 50 [2021-11-21 01:26:49,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:49,640 INFO L225 Difference]: With dead ends: 223 [2021-11-21 01:26:49,641 INFO L226 Difference]: Without dead ends: 122 [2021-11-21 01:26:49,642 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 337 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=200, Invalid=1206, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 01:26:49,643 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 83 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 296 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:49,643 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 10 Invalid, 296 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:26:49,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-21 01:26:49,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 111. [2021-11-21 01:26:49,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.1818181818181819) internal successors, (130), 110 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:49,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 130 transitions. [2021-11-21 01:26:49,663 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 130 transitions. Word has length 50 [2021-11-21 01:26:49,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:49,664 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 130 transitions. [2021-11-21 01:26:49,664 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.4761904761904763) internal successors, (73), 21 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:49,664 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 130 transitions. [2021-11-21 01:26:49,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-21 01:26:49,667 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:49,667 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2021-11-21 01:26:49,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:26:49,885 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:49,885 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:49,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:49,885 INFO L85 PathProgramCache]: Analyzing trace with hash 1423124666, now seen corresponding path program 4 times [2021-11-21 01:26:49,886 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:49,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [955706051] [2021-11-21 01:26:49,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:49,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:49,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:50,167 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 15 proven. 209 refuted. 0 times theorem prover too weak. 265 trivial. 0 not checked. [2021-11-21 01:26:50,168 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:50,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [955706051] [2021-11-21 01:26:50,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [955706051] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:26:50,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2103705253] [2021-11-21 01:26:50,168 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:26:50,168 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:50,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:50,169 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:26:50,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:26:50,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:50,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 01:26:50,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:26:50,576 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 262 proven. 87 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-11-21 01:26:50,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:26:50,940 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 260 proven. 89 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-11-21 01:26:50,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2103705253] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:26:50,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [522489644] [2021-11-21 01:26:50,943 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 01:26:50,943 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:26:50,943 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:26:50,943 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:26:50,944 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:26:58,742 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:26:59,396 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:26:59,396 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:26:59,396 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 24 [2021-11-21 01:26:59,396 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209815748] [2021-11-21 01:26:59,397 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:26:59,397 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 01:26:59,397 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:59,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 01:26:59,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=876, Unknown=0, NotChecked=0, Total=992 [2021-11-21 01:26:59,399 INFO L87 Difference]: Start difference. First operand 111 states and 130 transitions. Second operand has 24 states, 24 states have (on average 4.041666666666667) internal successors, (97), 24 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:05,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:05,217 INFO L93 Difference]: Finished difference Result 644 states and 814 transitions. [2021-11-21 01:27:05,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-11-21 01:27:05,217 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 4.041666666666667) internal successors, (97), 24 states have internal predecessors, (97), 0 states have call successors, (0), 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 74 [2021-11-21 01:27:05,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:05,222 INFO L225 Difference]: With dead ends: 644 [2021-11-21 01:27:05,222 INFO L226 Difference]: Without dead ends: 537 [2021-11-21 01:27:05,227 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2422 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=1152, Invalid=6680, Unknown=0, NotChecked=0, Total=7832 [2021-11-21 01:27:05,230 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 506 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 733 mSolverCounterSat, 235 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 506 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 968 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 235 IncrementalHoareTripleChecker+Valid, 733 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:05,230 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [506 Valid, 11 Invalid, 968 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [235 Valid, 733 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-21 01:27:05,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 537 states. [2021-11-21 01:27:05,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 537 to 335. [2021-11-21 01:27:05,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 334 states have (on average 1.122754491017964) internal successors, (375), 334 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:05,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 375 transitions. [2021-11-21 01:27:05,339 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 375 transitions. Word has length 74 [2021-11-21 01:27:05,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:05,341 INFO L470 AbstractCegarLoop]: Abstraction has 335 states and 375 transitions. [2021-11-21 01:27:05,341 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 4.041666666666667) internal successors, (97), 24 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:05,341 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 375 transitions. [2021-11-21 01:27:05,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2021-11-21 01:27:05,364 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:05,365 INFO L514 BasicCegarLoop]: trace histogram [85, 84, 84, 13, 13, 12, 12, 12, 11, 2, 1, 1, 1, 1] [2021-11-21 01:27:05,404 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:05,586 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-21 01:27:05,586 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:05,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:05,587 INFO L85 PathProgramCache]: Analyzing trace with hash 32824799, now seen corresponding path program 5 times [2021-11-21 01:27:05,587 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:05,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1717800663] [2021-11-21 01:27:05,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:05,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:06,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:06,751 INFO L134 CoverageAnalysis]: Checked inductivity of 12367 backedges. 60 proven. 1944 refuted. 0 times theorem prover too weak. 10363 trivial. 0 not checked. [2021-11-21 01:27:06,752 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:06,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1717800663] [2021-11-21 01:27:06,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1717800663] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:06,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1246421608] [2021-11-21 01:27:06,752 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:27:06,753 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:06,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:06,757 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:06,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:27:06,812 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2021-11-21 01:27:06,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:27:06,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:27:06,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:07,598 INFO L134 CoverageAnalysis]: Checked inductivity of 12367 backedges. 1668 proven. 0 refuted. 0 times theorem prover too weak. 10699 trivial. 0 not checked. [2021-11-21 01:27:07,598 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:27:07,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1246421608] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:27:07,599 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:27:07,599 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [12] total 14 [2021-11-21 01:27:07,599 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320737950] [2021-11-21 01:27:07,600 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:27:07,600 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:27:07,600 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:07,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:27:07,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-11-21 01:27:07,601 INFO L87 Difference]: Start difference. First operand 335 states and 375 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 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) [2021-11-21 01:27:07,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:07,694 INFO L93 Difference]: Finished difference Result 603 states and 656 transitions. [2021-11-21 01:27:07,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:27:07,695 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 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 332 [2021-11-21 01:27:07,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:07,701 INFO L225 Difference]: With dead ends: 603 [2021-11-21 01:27:07,701 INFO L226 Difference]: Without dead ends: 601 [2021-11-21 01:27:07,701 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 331 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-11-21 01:27:07,702 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 2 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:07,703 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 4 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:27:07,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2021-11-21 01:27:07,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 354. [2021-11-21 01:27:07,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 354 states, 353 states have (on average 1.1189801699716715) internal successors, (395), 353 states have internal predecessors, (395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:07,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 354 states to 354 states and 395 transitions. [2021-11-21 01:27:07,755 INFO L78 Accepts]: Start accepts. Automaton has 354 states and 395 transitions. Word has length 332 [2021-11-21 01:27:07,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:07,756 INFO L470 AbstractCegarLoop]: Abstraction has 354 states and 395 transitions. [2021-11-21 01:27:07,756 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 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) [2021-11-21 01:27:07,756 INFO L276 IsEmpty]: Start isEmpty. Operand 354 states and 395 transitions. [2021-11-21 01:27:07,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 353 [2021-11-21 01:27:07,762 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:07,762 INFO L514 BasicCegarLoop]: trace histogram [91, 90, 90, 14, 13, 13, 12, 12, 11, 2, 1, 1, 1, 1] [2021-11-21 01:27:07,799 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:07,989 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 01:27:07,989 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:07,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:07,989 INFO L85 PathProgramCache]: Analyzing trace with hash 2045133972, now seen corresponding path program 6 times [2021-11-21 01:27:07,990 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:07,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949714406] [2021-11-21 01:27:07,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:07,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:08,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:09,031 INFO L134 CoverageAnalysis]: Checked inductivity of 14136 backedges. 61 proven. 2090 refuted. 0 times theorem prover too weak. 11985 trivial. 0 not checked. [2021-11-21 01:27:09,032 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:09,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949714406] [2021-11-21 01:27:09,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1949714406] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:09,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1901995911] [2021-11-21 01:27:09,032 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:27:09,032 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:09,032 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:09,033 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:09,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:27:09,226 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:27:09,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:27:09,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 635 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:27:09,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:10,025 INFO L134 CoverageAnalysis]: Checked inductivity of 14136 backedges. 2043 proven. 26 refuted. 0 times theorem prover too weak. 12067 trivial. 0 not checked. [2021-11-21 01:27:10,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:10,755 INFO L134 CoverageAnalysis]: Checked inductivity of 14136 backedges. 2042 proven. 27 refuted. 0 times theorem prover too weak. 12067 trivial. 0 not checked. [2021-11-21 01:27:10,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1901995911] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:10,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1923659] [2021-11-21 01:27:10,759 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 01:27:10,759 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:10,759 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:10,759 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:10,760 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:21,529 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:27,868 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:27,869 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:27,869 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7, 7] total 23 [2021-11-21 01:27:27,869 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543005438] [2021-11-21 01:27:27,869 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:27,870 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-21 01:27:27,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:27,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-21 01:27:27,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=714, Unknown=0, NotChecked=0, Total=812 [2021-11-21 01:27:27,871 INFO L87 Difference]: Start difference. First operand 354 states and 395 transitions. Second operand has 23 states, 23 states have (on average 3.5217391304347827) internal successors, (81), 23 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:31,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:31,777 INFO L93 Difference]: Finished difference Result 2152 states and 2555 transitions. [2021-11-21 01:27:31,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-21 01:27:31,777 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.5217391304347827) internal successors, (81), 23 states have internal predecessors, (81), 0 states have call successors, (0), 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 352 [2021-11-21 01:27:31,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:31,787 INFO L225 Difference]: With dead ends: 2152 [2021-11-21 01:27:31,787 INFO L226 Difference]: Without dead ends: 1802 [2021-11-21 01:27:31,791 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1116 GetRequests, 936 SyntacticMatches, 104 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2824 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=925, Invalid=5081, Unknown=0, NotChecked=0, Total=6006 [2021-11-21 01:27:31,792 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 417 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 733 mSolverCounterSat, 209 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 417 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 942 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 209 IncrementalHoareTripleChecker+Valid, 733 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:31,792 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [417 Valid, 14 Invalid, 942 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [209 Valid, 733 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-21 01:27:31,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1802 states. [2021-11-21 01:27:31,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1802 to 1548. [2021-11-21 01:27:31,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1548 states, 1547 states have (on average 1.0723981900452488) internal successors, (1659), 1547 states have internal predecessors, (1659), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:31,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1548 states to 1548 states and 1659 transitions. [2021-11-21 01:27:31,975 INFO L78 Accepts]: Start accepts. Automaton has 1548 states and 1659 transitions. Word has length 352 [2021-11-21 01:27:31,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:31,976 INFO L470 AbstractCegarLoop]: Abstraction has 1548 states and 1659 transitions. [2021-11-21 01:27:31,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.5217391304347827) internal successors, (81), 23 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:31,976 INFO L276 IsEmpty]: Start isEmpty. Operand 1548 states and 1659 transitions. [2021-11-21 01:27:32,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1546 [2021-11-21 01:27:32,037 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:32,038 INFO L514 BasicCegarLoop]: trace histogram [442, 441, 441, 49, 48, 48, 47, 12, 11, 2, 1, 1, 1, 1] [2021-11-21 01:27:32,066 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-21 01:27:32,248 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:32,252 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:32,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:32,252 INFO L85 PathProgramCache]: Analyzing trace with hash 1388442638, now seen corresponding path program 7 times [2021-11-21 01:27:32,252 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:32,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1760225513] [2021-11-21 01:27:32,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:32,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:36,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:38,437 INFO L134 CoverageAnalysis]: Checked inductivity of 320636 backedges. 166 proven. 13134 refuted. 0 times theorem prover too weak. 307336 trivial. 0 not checked. [2021-11-21 01:27:38,437 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:38,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1760225513] [2021-11-21 01:27:38,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1760225513] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:38,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900831847] [2021-11-21 01:27:38,438 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:27:38,438 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:38,439 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:38,441 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:38,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 01:27:38,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:39,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 2459 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:27:39,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:43,952 INFO L134 CoverageAnalysis]: Checked inductivity of 320636 backedges. 160667 proven. 6120 refuted. 0 times theorem prover too weak. 153849 trivial. 0 not checked. [2021-11-21 01:27:43,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:47,038 INFO L134 CoverageAnalysis]: Checked inductivity of 320636 backedges. 160632 proven. 6155 refuted. 0 times theorem prover too weak. 153849 trivial. 0 not checked. [2021-11-21 01:27:47,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1900831847] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:47,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [492682901] [2021-11-21 01:27:47,044 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 01:27:47,044 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:47,044 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:47,045 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:47,045 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:28:00,513 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:28:31,814 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:28:31,814 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:28:31,815 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 6, 6] total 24 [2021-11-21 01:28:31,816 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820788145] [2021-11-21 01:28:31,816 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:28:31,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 01:28:31,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:28:31,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 01:28:31,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=819, Unknown=0, NotChecked=0, Total=930 [2021-11-21 01:28:31,820 INFO L87 Difference]: Start difference. First operand 1548 states and 1659 transitions. Second operand has 25 states, 25 states have (on average 3.96) internal successors, (99), 24 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:39,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:28:39,110 INFO L93 Difference]: Finished difference Result 7643 states and 8366 transitions. [2021-11-21 01:28:39,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-11-21 01:28:39,111 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.96) internal successors, (99), 24 states have internal predecessors, (99), 0 states have call successors, (0), 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 1545 [2021-11-21 01:28:39,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:28:39,142 INFO L225 Difference]: With dead ends: 7643 [2021-11-21 01:28:39,142 INFO L226 Difference]: Without dead ends: 5849 [2021-11-21 01:28:39,151 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4736 GetRequests, 4129 SyntacticMatches, 490 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9877 ImplicationChecksByTransitivity, 36.9s TimeCoverageRelationStatistics Valid=1519, Invalid=12523, Unknown=0, NotChecked=0, Total=14042 [2021-11-21 01:28:39,151 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 802 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 1277 mSolverCounterSat, 401 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 802 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 1678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 401 IncrementalHoareTripleChecker+Valid, 1277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:28:39,152 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [802 Valid, 8 Invalid, 1678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [401 Valid, 1277 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-21 01:28:39,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5849 states. [2021-11-21 01:28:39,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5849 to 4025. [2021-11-21 01:28:39,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4025 states, 4024 states have (on average 1.05889662027833) internal successors, (4261), 4024 states have internal predecessors, (4261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:39,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4025 states to 4025 states and 4261 transitions. [2021-11-21 01:28:39,729 INFO L78 Accepts]: Start accepts. Automaton has 4025 states and 4261 transitions. Word has length 1545 [2021-11-21 01:28:39,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:28:39,730 INFO L470 AbstractCegarLoop]: Abstraction has 4025 states and 4261 transitions. [2021-11-21 01:28:39,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.96) internal successors, (99), 24 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:39,731 INFO L276 IsEmpty]: Start isEmpty. Operand 4025 states and 4261 transitions. [2021-11-21 01:28:39,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2461 [2021-11-21 01:28:39,780 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:28:39,782 INFO L514 BasicCegarLoop]: trace histogram [731, 730, 730, 73, 72, 48, 47, 12, 11, 2, 1, 1, 1, 1] [2021-11-21 01:28:39,812 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 01:28:39,989 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:39,989 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:28:39,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:28:39,990 INFO L85 PathProgramCache]: Analyzing trace with hash -266246412, now seen corresponding path program 8 times [2021-11-21 01:28:39,990 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:28:39,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017182240] [2021-11-21 01:28:39,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:28:39,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:28:47,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:49,877 INFO L134 CoverageAnalysis]: Checked inductivity of 863833 backedges. 190 proven. 23987 refuted. 0 times theorem prover too weak. 839656 trivial. 0 not checked. [2021-11-21 01:28:49,877 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:28:49,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017182240] [2021-11-21 01:28:49,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1017182240] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:28:49,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1529289494] [2021-11-21 01:28:49,878 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:28:49,878 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:49,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:28:49,878 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:28:49,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 01:28:50,060 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:28:50,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:28:50,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:28:50,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:28:55,203 INFO L134 CoverageAnalysis]: Checked inductivity of 863833 backedges. 46528 proven. 332 refuted. 0 times theorem prover too weak. 816973 trivial. 0 not checked. [2021-11-21 01:28:55,203 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:29:03,942 INFO L134 CoverageAnalysis]: Checked inductivity of 863833 backedges. 0 proven. 46860 refuted. 0 times theorem prover too weak. 816973 trivial. 0 not checked. [2021-11-21 01:29:03,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1529289494] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:29:03,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1979544899] [2021-11-21 01:29:03,946 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 01:29:03,946 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:29:03,947 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:29:03,947 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:29:03,947 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:29:27,961 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:30:16,252 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:30:16,252 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:30:16,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 4, 4] total 21 [2021-11-21 01:30:16,254 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452627015] [2021-11-21 01:30:16,254 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:30:16,257 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-21 01:30:16,257 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:30:16,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-21 01:30:16,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=630, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:30:16,258 INFO L87 Difference]: Start difference. First operand 4025 states and 4261 transitions. Second operand has 22 states, 22 states have (on average 4.363636363636363) internal successors, (96), 21 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:30:20,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:30:20,276 INFO L93 Difference]: Finished difference Result 13668 states and 14816 transitions. [2021-11-21 01:30:20,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-11-21 01:30:20,277 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 4.363636363636363) internal successors, (96), 21 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2460 [2021-11-21 01:30:20,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:30:20,325 INFO L225 Difference]: With dead ends: 13668 [2021-11-21 01:30:20,325 INFO L226 Difference]: Without dead ends: 9679 [2021-11-21 01:30:20,336 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7457 GetRequests, 6565 SyntacticMatches, 803 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7977 ImplicationChecksByTransitivity, 51.2s TimeCoverageRelationStatistics Valid=1249, Invalid=6941, Unknown=0, NotChecked=0, Total=8190 [2021-11-21 01:30:20,337 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 390 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 1004 mSolverCounterSat, 192 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 390 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 1196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 192 IncrementalHoareTripleChecker+Valid, 1004 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:30:20,337 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [390 Valid, 14 Invalid, 1196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [192 Valid, 1004 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 01:30:20,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9679 states. [2021-11-21 01:30:20,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9679 to 3889. [2021-11-21 01:30:20,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3889 states, 3888 states have (on average 1.0421810699588476) internal successors, (4052), 3888 states have internal predecessors, (4052), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:30:20,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3889 states to 3889 states and 4052 transitions. [2021-11-21 01:30:20,890 INFO L78 Accepts]: Start accepts. Automaton has 3889 states and 4052 transitions. Word has length 2460 [2021-11-21 01:30:20,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:30:20,891 INFO L470 AbstractCegarLoop]: Abstraction has 3889 states and 4052 transitions. [2021-11-21 01:30:20,891 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 4.363636363636363) internal successors, (96), 21 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:30:20,891 INFO L276 IsEmpty]: Start isEmpty. Operand 3889 states and 4052 transitions. [2021-11-21 01:30:20,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3887 [2021-11-21 01:30:20,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:30:20,994 INFO L514 BasicCegarLoop]: trace histogram [1189, 1188, 1188, 99, 98, 48, 47, 12, 11, 2, 1, 1, 1, 1] [2021-11-21 01:30:21,024 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 01:30:21,209 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 01:30:21,209 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:30:21,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:30:21,210 INFO L85 PathProgramCache]: Analyzing trace with hash 253347158, now seen corresponding path program 9 times [2021-11-21 01:30:21,210 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:30:21,210 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1270222882] [2021-11-21 01:30:21,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:30:21,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:30:36,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:30:41,204 INFO L134 CoverageAnalysis]: Checked inductivity of 2251260 backedges. 216 proven. 46184 refuted. 0 times theorem prover too weak. 2204860 trivial. 0 not checked. [2021-11-21 01:30:41,204 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:30:41,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1270222882] [2021-11-21 01:30:41,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1270222882] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:30:41,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [175710021] [2021-11-21 01:30:41,205 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:30:41,205 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:30:41,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:30:41,205 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:30:41,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 01:30:42,387 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:30:42,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:30:42,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 5747 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 01:30:42,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:30:49,286 INFO L134 CoverageAnalysis]: Checked inductivity of 2251260 backedges. 1127663 proven. 46567 refuted. 0 times theorem prover too weak. 1077030 trivial. 0 not checked. [2021-11-21 01:30:49,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:30:56,551 INFO L134 CoverageAnalysis]: Checked inductivity of 2251260 backedges. 1123313 proven. 50917 refuted. 0 times theorem prover too weak. 1077030 trivial. 0 not checked. [2021-11-21 01:30:56,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [175710021] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:30:56,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [329215975] [2021-11-21 01:30:56,555 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 01:30:56,555 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:30:56,555 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:30:56,555 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:30:56,556 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:31:04,956 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:31:05,830 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:31:05,830 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:31:05,833 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 9, 9] total 31 [2021-11-21 01:31:05,833 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745181820] [2021-11-21 01:31:05,833 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:31:05,837 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-21 01:31:05,837 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:31:05,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-21 01:31:05,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=1338, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 01:31:05,838 INFO L87 Difference]: Start difference. First operand 3889 states and 4052 transitions. Second operand has 31 states, 31 states have (on average 3.870967741935484) internal successors, (120), 31 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:31:11,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:31:11,156 INFO L93 Difference]: Finished difference Result 12552 states and 13351 transitions. [2021-11-21 01:31:11,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-11-21 01:31:11,156 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.870967741935484) internal successors, (120), 31 states have internal predecessors, (120), 0 states have call successors, (0), 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 3886 [2021-11-21 01:31:11,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:31:11,193 INFO L225 Difference]: With dead ends: 12552 [2021-11-21 01:31:11,194 INFO L226 Difference]: Without dead ends: 8378 [2021-11-21 01:31:11,203 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11739 GetRequests, 11638 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2912 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=854, Invalid=9652, Unknown=0, NotChecked=0, Total=10506 [2021-11-21 01:31:11,204 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 515 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 2808 mSolverCounterSat, 259 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 515 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 3067 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 259 IncrementalHoareTripleChecker+Valid, 2808 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:31:11,204 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [515 Valid, 22 Invalid, 3067 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [259 Valid, 2808 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-21 01:31:11,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8378 states. [2021-11-21 01:31:11,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8378 to 6113. [2021-11-21 01:31:11,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6113 states, 6112 states have (on average 1.0343586387434556) internal successors, (6322), 6112 states have internal predecessors, (6322), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:31:11,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6113 states to 6113 states and 6322 transitions. [2021-11-21 01:31:11,875 INFO L78 Accepts]: Start accepts. Automaton has 6113 states and 6322 transitions. Word has length 3886 [2021-11-21 01:31:11,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:31:11,877 INFO L470 AbstractCegarLoop]: Abstraction has 6113 states and 6322 transitions. [2021-11-21 01:31:11,877 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 3.870967741935484) internal successors, (120), 31 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:31:11,877 INFO L276 IsEmpty]: Start isEmpty. Operand 6113 states and 6322 transitions. [2021-11-21 01:31:12,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6111 [2021-11-21 01:31:12,086 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:31:12,088 INFO L514 BasicCegarLoop]: trace histogram [1899, 1898, 1898, 146, 145, 48, 47, 12, 11, 2, 1, 1, 1, 1] [2021-11-21 01:31:12,116 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 01:31:12,288 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 01:31:12,289 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:31:12,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:31:12,290 INFO L85 PathProgramCache]: Analyzing trace with hash -1462985721, now seen corresponding path program 10 times [2021-11-21 01:31:12,290 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:31:12,291 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1276950072] [2021-11-21 01:31:12,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:31:12,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:31:49,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:31:55,555 INFO L134 CoverageAnalysis]: Checked inductivity of 5710668 backedges. 263 proven. 79575 refuted. 0 times theorem prover too weak. 5630830 trivial. 0 not checked. [2021-11-21 01:31:55,555 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:31:55,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1276950072] [2021-11-21 01:31:55,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1276950072] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:31:55,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [766187862] [2021-11-21 01:31:55,556 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:31:55,557 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:31:55,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:31:55,558 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:31:55,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 01:31:57,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:31:57,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 8869 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-21 01:31:57,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:32:05,900 INFO L134 CoverageAnalysis]: Checked inductivity of 5710668 backedges. 229952 proven. 1720 refuted. 0 times theorem prover too weak. 5478996 trivial. 0 not checked. [2021-11-21 01:32:05,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:32:15,257 INFO L134 CoverageAnalysis]: Checked inductivity of 5710668 backedges. 229952 proven. 1720 refuted. 0 times theorem prover too weak. 5478996 trivial. 0 not checked. [2021-11-21 01:32:15,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [766187862] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:32:15,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [676892557] [2021-11-21 01:32:15,261 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 01:32:15,261 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:32:15,262 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:32:15,262 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:32:15,262 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:32:26,467 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:32:27,419 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:32:27,419 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:32:27,423 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 11, 11] total 37 [2021-11-21 01:32:27,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288333920] [2021-11-21 01:32:27,423 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:32:27,430 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-21 01:32:27,430 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:32:27,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-21 01:32:27,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1805, Unknown=0, NotChecked=0, Total=1980 [2021-11-21 01:32:27,431 INFO L87 Difference]: Start difference. First operand 6113 states and 6322 transitions. Second operand has 37 states, 37 states have (on average 3.4594594594594597) internal successors, (128), 37 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:32:58,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:32:58,659 INFO L93 Difference]: Finished difference Result 26547 states and 28892 transitions. [2021-11-21 01:32:58,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 148 states. [2021-11-21 01:32:58,659 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.4594594594594597) internal successors, (128), 37 states have internal predecessors, (128), 0 states have call successors, (0), 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 6110 [2021-11-21 01:32:58,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:32:58,704 INFO L225 Difference]: With dead ends: 26547 [2021-11-21 01:32:58,704 INFO L226 Difference]: Without dead ends: 20479 [2021-11-21 01:32:58,728 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18492 GetRequests, 18304 SyntacticMatches, 0 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12698 ImplicationChecksByTransitivity, 26.9s TimeCoverageRelationStatistics Valid=3767, Invalid=32143, Unknown=0, NotChecked=0, Total=35910 [2021-11-21 01:32:58,729 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 1193 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 3852 mSolverCounterSat, 672 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1193 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 4524 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 672 IncrementalHoareTripleChecker+Valid, 3852 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:32:58,730 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1193 Valid, 24 Invalid, 4524 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [672 Valid, 3852 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2021-11-21 01:32:58,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20479 states. [2021-11-21 01:33:00,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20479 to 19328. [2021-11-21 01:33:00,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19328 states, 19327 states have (on average 1.0231282661561547) internal successors, (19774), 19327 states have internal predecessors, (19774), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:33:00,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19328 states to 19328 states and 19774 transitions. [2021-11-21 01:33:00,747 INFO L78 Accepts]: Start accepts. Automaton has 19328 states and 19774 transitions. Word has length 6110 [2021-11-21 01:33:00,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:33:00,748 INFO L470 AbstractCegarLoop]: Abstraction has 19328 states and 19774 transitions. [2021-11-21 01:33:00,749 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 3.4594594594594597) internal successors, (128), 37 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:33:00,749 INFO L276 IsEmpty]: Start isEmpty. Operand 19328 states and 19774 transitions. [2021-11-21 01:33:02,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19325 [2021-11-21 01:33:02,705 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:33:02,712 INFO L514 BasicCegarLoop]: trace histogram [6145, 6144, 6144, 384, 383, 48, 47, 12, 11, 2, 1, 1, 1, 1] [2021-11-21 01:33:02,751 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 01:33:02,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6b72094-4a92-4603-9ce3-e3303d76ea53/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:33:02,913 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:33:02,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:33:02,916 INFO L85 PathProgramCache]: Analyzing trace with hash 1044344791, now seen corresponding path program 11 times [2021-11-21 01:33:02,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:33:02,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031349365] [2021-11-21 01:33:02,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:33:02,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms