./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/nested3-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/nested3-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh --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 ed8e064f31e82b4c33cb383334d25637eef982ae8d5b8603579b97c7fdfe808e --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 12:34:50,569 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 12:34:50,571 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 12:34:50,590 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 12:34:50,590 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 12:34:50,591 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 12:34:50,592 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 12:34:50,594 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 12:34:50,595 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 12:34:50,596 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 12:34:50,597 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 12:34:50,598 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 12:34:50,598 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 12:34:50,599 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 12:34:50,600 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 12:34:50,601 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 12:34:50,602 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 12:34:50,603 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 12:34:50,604 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 12:34:50,606 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 12:34:50,607 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 12:34:50,608 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 12:34:50,609 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 12:34:50,610 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 12:34:50,613 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 12:34:50,613 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 12:34:50,614 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 12:34:50,615 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 12:34:50,615 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 12:34:50,616 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 12:34:50,616 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 12:34:50,617 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 12:34:50,617 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 12:34:50,618 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 12:34:50,619 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 12:34:50,619 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 12:34:50,620 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 12:34:50,620 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 12:34:50,620 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 12:34:50,621 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 12:34:50,621 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 12:34:50,622 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 12:34:50,649 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 12:34:50,649 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 12:34:50,649 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 12:34:50,649 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 12:34:50,650 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 12:34:50,650 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 12:34:50,650 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 12:34:50,651 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 12:34:50,651 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 12:34:50,651 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 12:34:50,651 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 12:34:50,651 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 12:34:50,651 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 12:34:50,652 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 12:34:50,652 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 12:34:50,652 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 12:34:50,652 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 12:34:50,652 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 12:34:50,653 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 12:34:50,653 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 12:34:50,653 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 12:34:50,653 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 12:34:50,653 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 12:34:50,653 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 12:34:50,653 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 12:34:50,653 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 12:34:50,654 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 12:34:50,654 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 12:34:50,654 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 12:34:50,654 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 12:34:50,654 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 12:34:50,654 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 12:34:50,654 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 12:34:50,654 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 12:34:50,655 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 12:34:50,655 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 12:34:50,655 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 12:34:50,655 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 12:34:50,655 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 12:34:50,655 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 12:34:50,655 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 12:34:50,655 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ed8e064f31e82b4c33cb383334d25637eef982ae8d5b8603579b97c7fdfe808e [2022-12-14 12:34:50,823 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 12:34:50,844 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 12:34:50,846 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 12:34:50,847 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 12:34:50,848 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 12:34:50,849 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/loops-crafted-1/nested3-1.c [2022-12-14 12:34:53,471 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 12:34:53,589 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 12:34:53,589 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/sv-benchmarks/c/loops-crafted-1/nested3-1.c [2022-12-14 12:34:53,593 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/data/70b0951b9/875bac8a3e7b4d639f3a6abeb6996d14/FLAG1676a4be9 [2022-12-14 12:34:53,604 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/data/70b0951b9/875bac8a3e7b4d639f3a6abeb6996d14 [2022-12-14 12:34:53,607 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 12:34:53,608 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 12:34:53,609 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 12:34:53,609 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 12:34:53,612 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 12:34:53,613 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 12:34:53" (1/1) ... [2022-12-14 12:34:53,614 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2d37c6ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:34:53, skipping insertion in model container [2022-12-14 12:34:53,614 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 12:34:53" (1/1) ... [2022-12-14 12:34:53,619 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 12:34:53,629 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 12:34:53,738 WARN L237 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_b30354d6-c420-4d8e-868e-cd8d02378a4c/sv-benchmarks/c/loops-crafted-1/nested3-1.c[321,334] [2022-12-14 12:34:53,750 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 12:34:53,758 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 12:34:53,766 WARN L237 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_b30354d6-c420-4d8e-868e-cd8d02378a4c/sv-benchmarks/c/loops-crafted-1/nested3-1.c[321,334] [2022-12-14 12:34:53,770 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 12:34:53,782 INFO L208 MainTranslator]: Completed translation [2022-12-14 12:34:53,782 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:34:53 WrapperNode [2022-12-14 12:34:53,782 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 12:34:53,783 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 12:34:53,783 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 12:34:53,783 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 12:34:53,788 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:34:53" (1/1) ... [2022-12-14 12:34:53,793 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:34:53" (1/1) ... [2022-12-14 12:34:53,807 INFO L138 Inliner]: procedures = 12, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 42 [2022-12-14 12:34:53,807 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 12:34:53,808 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 12:34:53,808 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 12:34:53,808 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 12:34:53,815 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:34:53" (1/1) ... [2022-12-14 12:34:53,815 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:34:53" (1/1) ... [2022-12-14 12:34:53,816 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:34:53" (1/1) ... [2022-12-14 12:34:53,816 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:34:53" (1/1) ... [2022-12-14 12:34:53,819 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:34:53" (1/1) ... [2022-12-14 12:34:53,823 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:34:53" (1/1) ... [2022-12-14 12:34:53,824 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:34:53" (1/1) ... [2022-12-14 12:34:53,825 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:34:53" (1/1) ... [2022-12-14 12:34:53,826 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 12:34:53,827 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 12:34:53,827 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 12:34:53,827 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 12:34:53,828 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:34:53" (1/1) ... [2022-12-14 12:34:53,834 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 12:34:53,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:34:53,853 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 12:34:53,855 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 12:34:53,888 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 12:34:53,888 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 12:34:53,888 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 12:34:53,888 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 12:34:53,889 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-12-14 12:34:53,889 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-12-14 12:34:53,943 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 12:34:53,945 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 12:34:54,062 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 12:34:54,077 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 12:34:54,077 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-12-14 12:34:54,079 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 12:34:54 BoogieIcfgContainer [2022-12-14 12:34:54,079 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 12:34:54,080 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 12:34:54,080 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 12:34:54,083 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 12:34:54,083 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 12:34:53" (1/3) ... [2022-12-14 12:34:54,083 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e9bb2d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 12:34:54, skipping insertion in model container [2022-12-14 12:34:54,084 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:34:53" (2/3) ... [2022-12-14 12:34:54,084 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e9bb2d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 12:34:54, skipping insertion in model container [2022-12-14 12:34:54,084 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 12:34:54" (3/3) ... [2022-12-14 12:34:54,085 INFO L112 eAbstractionObserver]: Analyzing ICFG nested3-1.c [2022-12-14 12:34:54,099 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 12:34:54,099 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 12:34:54,134 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 12:34:54,138 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@bd4a101, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 12:34:54,139 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 12:34:54,142 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-12-14 12:34:54,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 12:34:54,147 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:34:54,147 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 12:34:54,148 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:34:54,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:34:54,151 INFO L85 PathProgramCache]: Analyzing trace with hash -1453215626, now seen corresponding path program 1 times [2022-12-14 12:34:54,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:34:54,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1417711842] [2022-12-14 12:34:54,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:34:54,160 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:34:54,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:34:54,336 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:34:54,336 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:34:54,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1417711842] [2022-12-14 12:34:54,337 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1417711842] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:34:54,338 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:34:54,338 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 12:34:54,339 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219634142] [2022-12-14 12:34:54,340 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:34:54,343 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:34:54,343 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:34:54,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:34:54,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 12:34:54,367 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:34:54,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:34:54,409 INFO L93 Difference]: Finished difference Result 40 states and 60 transitions. [2022-12-14 12:34:54,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:34:54,411 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-12-14 12:34:54,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:34:54,417 INFO L225 Difference]: With dead ends: 40 [2022-12-14 12:34:54,417 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 12:34:54,419 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 12:34:54,421 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 6 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:34:54,422 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 29 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:34:54,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 12:34:54,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 16. [2022-12-14 12:34:54,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 12:34:54,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2022-12-14 12:34:54,452 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 6 [2022-12-14 12:34:54,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:34:54,452 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2022-12-14 12:34:54,452 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:34:54,452 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2022-12-14 12:34:54,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-12-14 12:34:54,453 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:34:54,453 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:34:54,453 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 12:34:54,454 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:34:54,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:34:54,454 INFO L85 PathProgramCache]: Analyzing trace with hash 569943281, now seen corresponding path program 1 times [2022-12-14 12:34:54,454 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:34:54,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346006846] [2022-12-14 12:34:54,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:34:54,455 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:34:54,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:34:54,522 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:34:54,522 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:34:54,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346006846] [2022-12-14 12:34:54,523 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [346006846] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:34:54,523 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:34:54,523 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 12:34:54,523 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525607589] [2022-12-14 12:34:54,524 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:34:54,525 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:34:54,525 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:34:54,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:34:54,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 12:34:54,526 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:34:54,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:34:54,563 INFO L93 Difference]: Finished difference Result 34 states and 45 transitions. [2022-12-14 12:34:54,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:34:54,563 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-12-14 12:34:54,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:34:54,564 INFO L225 Difference]: With dead ends: 34 [2022-12-14 12:34:54,564 INFO L226 Difference]: Without dead ends: 20 [2022-12-14 12:34:54,564 INFO L412 NwaCegarLoop]: 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 [2022-12-14 12:34:54,565 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 3 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:34:54,565 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 25 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:34:54,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-12-14 12:34:54,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2022-12-14 12:34:54,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 12:34:54,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2022-12-14 12:34:54,569 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 7 [2022-12-14 12:34:54,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:34:54,569 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2022-12-14 12:34:54,569 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:34:54,569 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2022-12-14 12:34:54,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-12-14 12:34:54,570 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:34:54,570 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:34:54,570 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 12:34:54,570 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:34:54,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:34:54,571 INFO L85 PathProgramCache]: Analyzing trace with hash -935372046, now seen corresponding path program 1 times [2022-12-14 12:34:54,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:34:54,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [883057366] [2022-12-14 12:34:54,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:34:54,580 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:34:54,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:34:54,639 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:34:54,640 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:34:54,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [883057366] [2022-12-14 12:34:54,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [883057366] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:34:54,640 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:34:54,640 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 12:34:54,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750626744] [2022-12-14 12:34:54,641 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:34:54,641 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:34:54,641 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:34:54,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:34:54,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 12:34:54,643 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:34:54,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:34:54,663 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2022-12-14 12:34:54,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:34:54,663 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-12-14 12:34:54,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:34:54,664 INFO L225 Difference]: With dead ends: 34 [2022-12-14 12:34:54,664 INFO L226 Difference]: Without dead ends: 19 [2022-12-14 12:34:54,665 INFO L412 NwaCegarLoop]: 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 [2022-12-14 12:34:54,666 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:34:54,667 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 26 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:34:54,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-12-14 12:34:54,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2022-12-14 12:34:54,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 12:34:54,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2022-12-14 12:34:54,673 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 8 [2022-12-14 12:34:54,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:34:54,673 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2022-12-14 12:34:54,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:34:54,674 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2022-12-14 12:34:54,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 12:34:54,674 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:34:54,674 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:34:54,675 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-12-14 12:34:54,675 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:34:54,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:34:54,676 INFO L85 PathProgramCache]: Analyzing trace with hash -67368375, now seen corresponding path program 1 times [2022-12-14 12:34:54,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:34:54,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650606266] [2022-12-14 12:34:54,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:34:54,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:34:54,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:34:54,746 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:34:54,747 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:34:54,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650606266] [2022-12-14 12:34:54,747 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650606266] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:34:54,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [881413517] [2022-12-14 12:34:54,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:34:54,748 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:34:54,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:34:54,749 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:34:54,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 12:34:54,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:34:54,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 5 conjunts are in the unsatisfiable core [2022-12-14 12:34:54,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:34:54,823 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:34:54,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:34:54,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:34:54,846 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [881413517] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:34:54,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1787106571] [2022-12-14 12:34:54,861 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-12-14 12:34:54,861 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:34:54,864 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:34:54,868 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:34:54,869 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:34:55,029 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2022-12-14 12:34:55,051 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:34:55,234 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '328#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:34:55,235 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:34:55,235 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:34:55,235 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-12-14 12:34:55,235 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998169977] [2022-12-14 12:34:55,235 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:34:55,236 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 12:34:55,236 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:34:55,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 12:34:55,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2022-12-14 12:34:55,237 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:34:55,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:34:55,280 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2022-12-14 12:34:55,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 12:34:55,281 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-12-14 12:34:55,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:34:55,282 INFO L225 Difference]: With dead ends: 38 [2022-12-14 12:34:55,282 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 12:34:55,282 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2022-12-14 12:34:55,283 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 3 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:34:55,283 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 50 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:34:55,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 12:34:55,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2022-12-14 12:34:55,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 12:34:55,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2022-12-14 12:34:55,287 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 9 [2022-12-14 12:34:55,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:34:55,287 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2022-12-14 12:34:55,287 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:34:55,287 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2022-12-14 12:34:55,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-12-14 12:34:55,288 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:34:55,288 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:34:55,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 12:34:55,489 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:34:55,489 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:34:55,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:34:55,490 INFO L85 PathProgramCache]: Analyzing trace with hash 698087602, now seen corresponding path program 2 times [2022-12-14 12:34:55,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:34:55,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [267830830] [2022-12-14 12:34:55,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:34:55,491 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:34:55,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:34:55,580 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:34:55,580 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:34:55,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [267830830] [2022-12-14 12:34:55,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [267830830] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:34:55,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1113963845] [2022-12-14 12:34:55,581 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:34:55,581 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:34:55,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:34:55,582 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:34:55,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 12:34:55,625 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 12:34:55,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:34:55,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 12:34:55,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:34:55,891 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 12:34:55,891 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 12:34:55,891 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1113963845] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:34:55,891 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 12:34:55,892 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7] total 11 [2022-12-14 12:34:55,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669654244] [2022-12-14 12:34:55,892 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:34:55,892 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 12:34:55,892 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:34:55,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 12:34:55,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2022-12-14 12:34:55,893 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:34:56,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:34:56,094 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2022-12-14 12:34:56,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 12:34:56,094 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-12-14 12:34:56,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:34:56,095 INFO L225 Difference]: With dead ends: 28 [2022-12-14 12:34:56,095 INFO L226 Difference]: Without dead ends: 26 [2022-12-14 12:34:56,096 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2022-12-14 12:34:56,096 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 10 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:34:56,097 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 50 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:34:56,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-12-14 12:34:56,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2022-12-14 12:34:56,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 12:34:56,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2022-12-14 12:34:56,104 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 12 [2022-12-14 12:34:56,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:34:56,104 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2022-12-14 12:34:56,104 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:34:56,104 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2022-12-14 12:34:56,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 12:34:56,105 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:34:56,105 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:34:56,109 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 12:34:56,306 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:34:56,307 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:34:56,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:34:56,309 INFO L85 PathProgramCache]: Analyzing trace with hash -792997565, now seen corresponding path program 1 times [2022-12-14 12:34:56,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:34:56,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892296575] [2022-12-14 12:34:56,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:34:56,310 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:34:56,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:34:56,501 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:34:56,501 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:34:56,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892296575] [2022-12-14 12:34:56,501 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1892296575] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:34:56,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [553431408] [2022-12-14 12:34:56,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:34:56,501 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:34:56,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:34:56,502 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:34:56,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 12:34:56,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:34:56,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 12:34:56,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:34:56,575 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 12:34:56,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:34:56,651 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 12:34:56,651 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [553431408] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:34:56,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1300106282] [2022-12-14 12:34:56,653 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 12:34:56,653 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:34:56,654 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:34:56,654 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:34:56,654 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:34:57,057 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 43 for LOIs [2022-12-14 12:34:57,094 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:34:57,684 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '682#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:34:57,684 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:34:57,684 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:34:57,684 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 15 [2022-12-14 12:34:57,685 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155383321] [2022-12-14 12:34:57,685 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:34:57,685 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-12-14 12:34:57,685 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:34:57,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-12-14 12:34:57,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=419, Unknown=0, NotChecked=0, Total=506 [2022-12-14 12:34:57,687 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-12-14 12:34:58,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:34:58,024 INFO L93 Difference]: Finished difference Result 77 states and 96 transitions. [2022-12-14 12:34:58,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-12-14 12:34:58,024 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 19 [2022-12-14 12:34:58,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:34:58,025 INFO L225 Difference]: With dead ends: 77 [2022-12-14 12:34:58,025 INFO L226 Difference]: Without dead ends: 54 [2022-12-14 12:34:58,026 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 36 SyntacticMatches, 6 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 515 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=333, Invalid=1473, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 12:34:58,026 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 38 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:34:58,026 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 68 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:34:58,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-12-14 12:34:58,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2022-12-14 12:34:58,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 45 states have internal predecessors, (51), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-12-14 12:34:58,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2022-12-14 12:34:58,038 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 19 [2022-12-14 12:34:58,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:34:58,038 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2022-12-14 12:34:58,038 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-12-14 12:34:58,039 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2022-12-14 12:34:58,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-12-14 12:34:58,040 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:34:58,040 INFO L195 NwaCegarLoop]: trace histogram [20, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1] [2022-12-14 12:34:58,045 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 12:34:58,240 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 12:34:58,241 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:34:58,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:34:58,241 INFO L85 PathProgramCache]: Analyzing trace with hash -126110543, now seen corresponding path program 2 times [2022-12-14 12:34:58,242 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:34:58,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1463860838] [2022-12-14 12:34:58,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:34:58,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:34:58,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:34:58,424 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 15 refuted. 0 times theorem prover too weak. 195 trivial. 0 not checked. [2022-12-14 12:34:58,424 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:34:58,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1463860838] [2022-12-14 12:34:58,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1463860838] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:34:58,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1953736188] [2022-12-14 12:34:58,424 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:34:58,424 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:34:58,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:34:58,426 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:34:58,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 12:34:58,528 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-12-14 12:34:58,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:34:58,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 27 conjunts are in the unsatisfiable core [2022-12-14 12:34:58,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:34:58,578 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 106 proven. 115 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2022-12-14 12:34:58,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:34:58,753 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 126 proven. 15 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2022-12-14 12:34:58,754 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1953736188] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:34:58,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1314802147] [2022-12-14 12:34:58,756 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 12:34:58,756 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:34:58,756 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:34:58,757 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:34:58,757 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:34:59,039 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 44 for LOIs [2022-12-14 12:34:59,084 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:34:59,582 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1315#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:34:59,582 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:34:59,582 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:34:59,583 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2022-12-14 12:34:59,583 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001849235] [2022-12-14 12:34:59,583 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:34:59,583 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-12-14 12:34:59,583 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:34:59,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-12-14 12:34:59,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=431, Unknown=0, NotChecked=0, Total=552 [2022-12-14 12:34:59,585 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-12-14 12:35:00,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:35:00,796 INFO L93 Difference]: Finished difference Result 133 states and 179 transitions. [2022-12-14 12:35:00,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-12-14 12:35:00,797 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 59 [2022-12-14 12:35:00,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:35:00,798 INFO L225 Difference]: With dead ends: 133 [2022-12-14 12:35:00,798 INFO L226 Difference]: Without dead ends: 82 [2022-12-14 12:35:00,799 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=219, Invalid=651, Unknown=0, NotChecked=0, Total=870 [2022-12-14 12:35:00,800 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 28 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:35:00,800 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 64 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:35:00,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-12-14 12:35:00,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2022-12-14 12:35:00,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 72 states have (on average 1.0972222222222223) internal successors, (79), 73 states have internal predecessors, (79), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-12-14 12:35:00,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 90 transitions. [2022-12-14 12:35:00,820 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 90 transitions. Word has length 59 [2022-12-14 12:35:00,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:35:00,820 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 90 transitions. [2022-12-14 12:35:00,820 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-12-14 12:35:00,820 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 90 transitions. [2022-12-14 12:35:00,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-12-14 12:35:00,822 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:35:00,822 INFO L195 NwaCegarLoop]: trace histogram [48, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1] [2022-12-14 12:35:00,827 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 12:35:01,023 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:35:01,023 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:35:01,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:35:01,023 INFO L85 PathProgramCache]: Analyzing trace with hash 1855814201, now seen corresponding path program 3 times [2022-12-14 12:35:01,023 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:35:01,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [396811506] [2022-12-14 12:35:01,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:35:01,024 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:35:01,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:35:01,377 INFO L134 CoverageAnalysis]: Checked inductivity of 1380 backedges. 519 proven. 78 refuted. 0 times theorem prover too weak. 783 trivial. 0 not checked. [2022-12-14 12:35:01,377 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:35:01,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [396811506] [2022-12-14 12:35:01,377 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [396811506] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:35:01,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596512727] [2022-12-14 12:35:01,377 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:35:01,378 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:35:01,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:35:01,378 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:35:01,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 12:35:01,449 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:35:01,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:35:01,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 12:35:01,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:35:01,652 INFO L134 CoverageAnalysis]: Checked inductivity of 1380 backedges. 8 proven. 1086 refuted. 0 times theorem prover too weak. 286 trivial. 0 not checked. [2022-12-14 12:35:01,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:35:01,998 INFO L134 CoverageAnalysis]: Checked inductivity of 1380 backedges. 48 proven. 1046 refuted. 0 times theorem prover too weak. 286 trivial. 0 not checked. [2022-12-14 12:35:01,998 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596512727] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:35:01,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [509885439] [2022-12-14 12:35:02,000 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 12:35:02,000 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:35:02,000 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:35:02,001 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:35:02,001 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:35:02,306 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 44 for LOIs [2022-12-14 12:35:02,341 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:35:04,817 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2275#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:35:04,818 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:35:04,818 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:35:04,818 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 12] total 35 [2022-12-14 12:35:04,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795112223] [2022-12-14 12:35:04,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:35:04,818 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 12:35:04,818 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:35:04,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 12:35:04,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=1649, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 12:35:04,820 INFO L87 Difference]: Start difference. First operand 81 states and 90 transitions. Second operand has 35 states, 35 states have (on average 2.085714285714286) internal successors, (73), 35 states have internal predecessors, (73), 9 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-12-14 12:35:13,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:35:13,487 INFO L93 Difference]: Finished difference Result 267 states and 313 transitions. [2022-12-14 12:35:13,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2022-12-14 12:35:13,487 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.085714285714286) internal successors, (73), 35 states have internal predecessors, (73), 9 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 87 [2022-12-14 12:35:13,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:35:13,488 INFO L225 Difference]: With dead ends: 267 [2022-12-14 12:35:13,488 INFO L226 Difference]: Without dead ends: 188 [2022-12-14 12:35:13,492 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 181 SyntacticMatches, 52 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12313 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=3480, Invalid=27672, Unknown=0, NotChecked=0, Total=31152 [2022-12-14 12:35:13,493 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 104 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 1535 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 1573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 1535 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 12:35:13,493 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 172 Invalid, 1573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 1535 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 12:35:13,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2022-12-14 12:35:13,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 187. [2022-12-14 12:35:13,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 172 states have (on average 1.0755813953488371) internal successors, (185), 173 states have internal predecessors, (185), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-12-14 12:35:13,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 208 transitions. [2022-12-14 12:35:13,530 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 208 transitions. Word has length 87 [2022-12-14 12:35:13,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:35:13,530 INFO L495 AbstractCegarLoop]: Abstraction has 187 states and 208 transitions. [2022-12-14 12:35:13,531 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.085714285714286) internal successors, (73), 35 states have internal predecessors, (73), 9 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-12-14 12:35:13,531 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 208 transitions. [2022-12-14 12:35:13,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2022-12-14 12:35:13,534 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:35:13,535 INFO L195 NwaCegarLoop]: trace histogram [130, 11, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1] [2022-12-14 12:35:13,539 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 12:35:13,735 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:35:13,736 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:35:13,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:35:13,738 INFO L85 PathProgramCache]: Analyzing trace with hash -1480745135, now seen corresponding path program 4 times [2022-12-14 12:35:13,738 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:35:13,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252039531] [2022-12-14 12:35:13,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:35:13,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:35:13,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:35:14,341 INFO L134 CoverageAnalysis]: Checked inductivity of 10075 backedges. 1794 proven. 91 refuted. 0 times theorem prover too weak. 8190 trivial. 0 not checked. [2022-12-14 12:35:14,341 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:35:14,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252039531] [2022-12-14 12:35:14,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1252039531] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:35:14,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [781847798] [2022-12-14 12:35:14,342 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:35:14,342 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:35:14,342 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:35:14,343 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:35:14,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 12:35:14,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:35:14,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 586 conjuncts, 46 conjunts are in the unsatisfiable core [2022-12-14 12:35:14,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:35:14,885 INFO L134 CoverageAnalysis]: Checked inductivity of 10075 backedges. 20 proven. 9053 refuted. 0 times theorem prover too weak. 1002 trivial. 0 not checked. [2022-12-14 12:35:14,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:35:16,037 INFO L134 CoverageAnalysis]: Checked inductivity of 10075 backedges. 53 proven. 9020 refuted. 0 times theorem prover too weak. 1002 trivial. 0 not checked. [2022-12-14 12:35:16,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [781847798] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:35:16,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1271116298] [2022-12-14 12:35:16,039 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 12:35:16,039 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:35:16,039 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:35:16,039 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:35:16,039 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:35:16,284 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 44 for LOIs [2022-12-14 12:35:16,317 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:35:24,462 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4761#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:35:24,462 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:35:24,462 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:35:24,462 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 24, 24] total 60 [2022-12-14 12:35:24,462 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255607630] [2022-12-14 12:35:24,462 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:35:24,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-12-14 12:35:24,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:35:24,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-12-14 12:35:24,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=714, Invalid=3978, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 12:35:24,464 INFO L87 Difference]: Start difference. First operand 187 states and 208 transitions. Second operand has 60 states, 60 states have (on average 2.2333333333333334) internal successors, (134), 60 states have internal predecessors, (134), 21 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2022-12-14 12:38:22,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:38:22,556 INFO L93 Difference]: Finished difference Result 599 states and 699 transitions. [2022-12-14 12:38:22,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 342 states. [2022-12-14 12:38:22,556 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.2333333333333334) internal successors, (134), 60 states have internal predecessors, (134), 21 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) Word has length 217 [2022-12-14 12:38:22,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:38:22,557 INFO L225 Difference]: With dead ends: 599 [2022-12-14 12:38:22,557 INFO L226 Difference]: Without dead ends: 414 [2022-12-14 12:38:22,568 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 983 GetRequests, 459 SyntacticMatches, 140 SemanticMatches, 384 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65971 ImplicationChecksByTransitivity, 184.8s TimeCoverageRelationStatistics Valid=15864, Invalid=132746, Unknown=0, NotChecked=0, Total=148610 [2022-12-14 12:38:22,569 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 225 mSDsluCounter, 312 mSDsCounter, 0 mSdLazyCounter, 5230 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 355 SdHoareTripleChecker+Invalid, 5294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 5230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-12-14 12:38:22,569 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [226 Valid, 355 Invalid, 5294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 5230 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-12-14 12:38:22,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2022-12-14 12:38:22,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 413. [2022-12-14 12:38:22,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 413 states, 386 states have (on average 1.0647668393782384) internal successors, (411), 387 states have internal predecessors, (411), 24 states have call successors, (24), 2 states have call predecessors, (24), 2 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2022-12-14 12:38:22,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 458 transitions. [2022-12-14 12:38:22,625 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 458 transitions. Word has length 217 [2022-12-14 12:38:22,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:38:22,626 INFO L495 AbstractCegarLoop]: Abstraction has 413 states and 458 transitions. [2022-12-14 12:38:22,626 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 2.2333333333333334) internal successors, (134), 60 states have internal predecessors, (134), 21 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2022-12-14 12:38:22,626 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 458 transitions. [2022-12-14 12:38:22,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2022-12-14 12:38:22,632 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:38:22,632 INFO L195 NwaCegarLoop]: trace histogram [308, 23, 22, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1] [2022-12-14 12:38:22,638 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 12:38:22,833 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:38:22,834 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:38:22,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:38:22,835 INFO L85 PathProgramCache]: Analyzing trace with hash -153647811, now seen corresponding path program 5 times [2022-12-14 12:38:22,836 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:38:22,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1220258688] [2022-12-14 12:38:22,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:38:22,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:38:23,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:38:24,077 INFO L134 CoverageAnalysis]: Checked inductivity of 55968 backedges. 4791 proven. 105 refuted. 0 times theorem prover too weak. 51072 trivial. 0 not checked. [2022-12-14 12:38:24,077 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:38:24,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1220258688] [2022-12-14 12:38:24,077 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1220258688] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:38:24,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590302526] [2022-12-14 12:38:24,077 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:38:24,077 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:38:24,078 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:38:24,078 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:38:24,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 12:38:24,932 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2022-12-14 12:38:24,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:38:24,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 12:38:24,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:38:24,996 INFO L134 CoverageAnalysis]: Checked inductivity of 55968 backedges. 4915 proven. 105 refuted. 0 times theorem prover too weak. 50948 trivial. 0 not checked. [2022-12-14 12:38:24,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:38:26,720 INFO L134 CoverageAnalysis]: Checked inductivity of 55968 backedges. 4833 proven. 105 refuted. 0 times theorem prover too weak. 51030 trivial. 0 not checked. [2022-12-14 12:38:26,721 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [590302526] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:38:26,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1030608445] [2022-12-14 12:38:26,722 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 12:38:26,722 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:38:26,723 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:38:26,723 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:38:26,723 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:38:27,031 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 43 for LOIs [2022-12-14 12:38:27,066 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:38:28,490 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10318#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-12-14 12:38:28,490 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:38:28,490 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:38:28,490 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2022-12-14 12:38:28,490 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911371995] [2022-12-14 12:38:28,490 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:38:28,491 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-12-14 12:38:28,491 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:38:28,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-12-14 12:38:28,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=359, Invalid=1281, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 12:38:28,492 INFO L87 Difference]: Start difference. First operand 413 states and 458 transitions. Second operand has 33 states, 33 states have (on average 1.606060606060606) internal successors, (53), 33 states have internal predecessors, (53), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-12-14 12:38:36,703 WARN L233 SmtUtils]: Spent 7.36s on a formula simplification. DAG size of input: 88 DAG size of output: 10 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 12:39:24,743 WARN L233 SmtUtils]: Spent 16.10s on a formula simplification. DAG size of input: 88 DAG size of output: 48 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 12:39:29,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:39:29,253 INFO L93 Difference]: Finished difference Result 1177 states and 1619 transitions. [2022-12-14 12:39:29,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-12-14 12:39:29,254 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.606060606060606) internal successors, (53), 33 states have internal predecessors, (53), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 491 [2022-12-14 12:39:29,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:39:29,256 INFO L225 Difference]: With dead ends: 1177 [2022-12-14 12:39:29,256 INFO L226 Difference]: Without dead ends: 766 [2022-12-14 12:39:29,257 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1505 GetRequests, 1428 SyntacticMatches, 23 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 889 ImplicationChecksByTransitivity, 59.1s TimeCoverageRelationStatistics Valid=868, Invalid=2212, Unknown=0, NotChecked=0, Total=3080 [2022-12-14 12:39:29,258 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 72 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2022-12-14 12:39:29,258 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 141 Invalid, 349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2022-12-14 12:39:29,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 766 states. [2022-12-14 12:39:29,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 766 to 765. [2022-12-14 12:39:29,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 765 states, 738 states have (on average 1.0338753387533874) internal successors, (763), 739 states have internal predecessors, (763), 24 states have call successors, (24), 2 states have call predecessors, (24), 2 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2022-12-14 12:39:29,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 765 states to 765 states and 810 transitions. [2022-12-14 12:39:29,354 INFO L78 Accepts]: Start accepts. Automaton has 765 states and 810 transitions. Word has length 491 [2022-12-14 12:39:29,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:39:29,355 INFO L495 AbstractCegarLoop]: Abstraction has 765 states and 810 transitions. [2022-12-14 12:39:29,355 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.606060606060606) internal successors, (53), 33 states have internal predecessors, (53), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-12-14 12:39:29,355 INFO L276 IsEmpty]: Start isEmpty. Operand 765 states and 810 transitions. [2022-12-14 12:39:29,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 844 [2022-12-14 12:39:29,372 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:39:29,372 INFO L195 NwaCegarLoop]: trace histogram [660, 23, 22, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1] [2022-12-14 12:39:29,377 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 12:39:29,572 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 12:39:29,573 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:39:29,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:39:29,575 INFO L85 PathProgramCache]: Analyzing trace with hash 917524285, now seen corresponding path program 6 times [2022-12-14 12:39:29,575 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:39:29,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [968117379] [2022-12-14 12:39:29,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:39:29,576 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:39:30,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:39:32,832 INFO L134 CoverageAnalysis]: Checked inductivity of 233904 backedges. 20247 proven. 465 refuted. 0 times theorem prover too weak. 213192 trivial. 0 not checked. [2022-12-14 12:39:32,833 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:39:32,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [968117379] [2022-12-14 12:39:32,833 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [968117379] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:39:32,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1561877669] [2022-12-14 12:39:32,833 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:39:32,833 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:39:32,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:39:32,834 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:39:32,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b30354d6-c420-4d8e-868e-cd8d02378a4c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 12:39:33,248 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:39:33,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:39:33,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 2356 conjuncts, 94 conjunts are in the unsatisfiable core [2022-12-14 12:39:33,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:39:35,407 INFO L134 CoverageAnalysis]: Checked inductivity of 233904 backedges. 44 proven. 223143 refuted. 0 times theorem prover too weak. 10717 trivial. 0 not checked. [2022-12-14 12:39:35,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:39:40,007 INFO L134 CoverageAnalysis]: Checked inductivity of 233904 backedges. 228 proven. 222959 refuted. 0 times theorem prover too weak. 10717 trivial. 0 not checked. [2022-12-14 12:39:40,007 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1561877669] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:39:40,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1835496784] [2022-12-14 12:39:40,009 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 12:39:40,009 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:39:40,009 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:39:40,009 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:39:40,009 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:39:40,274 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 43 for LOIs [2022-12-14 12:39:40,306 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:39:44,229 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19323#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:39:44,229 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:39:44,229 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:39:44,229 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 48, 48] total 125 [2022-12-14 12:39:44,230 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056087090] [2022-12-14 12:39:44,230 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:39:44,231 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2022-12-14 12:39:44,231 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:39:44,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2022-12-14 12:39:44,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2559, Invalid=14997, Unknown=0, NotChecked=0, Total=17556 [2022-12-14 12:39:44,235 INFO L87 Difference]: Start difference. First operand 765 states and 810 transitions. Second operand has 125 states, 125 states have (on average 2.168) internal successors, (271), 125 states have internal predecessors, (271), 45 states have call successors, (46), 2 states have call predecessors, (46), 1 states have return successors, (45), 45 states have call predecessors, (45), 45 states have call successors, (45) [2022-12-14 12:42:38,477 WARN L233 SmtUtils]: Spent 5.54s on a formula simplification. DAG size of input: 97 DAG size of output: 14 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)