./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur --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 39463d01f5c85d47bf5e231172595e96b8ff556c59c4a9ab8cf46a88a393b05c --- 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-38b53e6 [2022-11-25 22:32:21,280 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 22:32:21,283 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 22:32:21,311 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 22:32:21,312 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 22:32:21,313 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 22:32:21,315 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 22:32:21,316 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 22:32:21,318 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 22:32:21,319 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 22:32:21,321 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 22:32:21,322 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 22:32:21,322 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 22:32:21,323 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 22:32:21,325 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 22:32:21,326 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 22:32:21,327 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 22:32:21,328 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 22:32:21,330 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 22:32:21,332 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 22:32:21,334 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 22:32:21,336 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 22:32:21,337 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 22:32:21,338 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 22:32:21,342 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 22:32:21,342 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 22:32:21,343 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 22:32:21,344 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 22:32:21,345 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 22:32:21,346 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 22:32:21,346 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 22:32:21,347 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 22:32:21,348 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 22:32:21,349 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 22:32:21,351 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 22:32:21,351 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 22:32:21,352 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 22:32:21,353 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 22:32:21,353 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 22:32:21,354 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 22:32:21,355 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 22:32:21,356 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-25 22:32:21,385 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 22:32:21,386 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 22:32:21,386 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 22:32:21,387 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 22:32:21,387 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 22:32:21,388 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 22:32:21,388 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-25 22:32:21,388 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-25 22:32:21,389 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-25 22:32:21,389 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-25 22:32:21,389 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-25 22:32:21,390 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-25 22:32:21,390 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-25 22:32:21,390 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-25 22:32:21,390 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-25 22:32:21,391 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-25 22:32:21,391 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-25 22:32:21,391 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-25 22:32:21,392 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 22:32:21,392 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 22:32:21,393 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 22:32:21,393 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 22:32:21,393 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 22:32:21,394 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-25 22:32:21,394 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 22:32:21,394 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-25 22:32:21,394 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 22:32:21,395 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-25 22:32:21,395 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 22:32:21,395 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-25 22:32:21,396 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 22:32:21,396 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 22:32:21,396 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 22:32:21,396 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 22:32:21,397 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-25 22:32:21,397 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 22:32:21,397 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-25 22:32:21,398 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-25 22:32:21,398 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 22:32:21,398 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-25 22:32:21,398 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-25 22:32:21,399 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_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 39463d01f5c85d47bf5e231172595e96b8ff556c59c4a9ab8cf46a88a393b05c [2022-11-25 22:32:21,717 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 22:32:21,743 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 22:32:21,746 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 22:32:21,748 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 22:32:21,748 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 22:32:21,750 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c [2022-11-25 22:32:25,039 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 22:32:25,310 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 22:32:25,311 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c [2022-11-25 22:32:25,318 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/data/075cbabf8/aa347f307ad94a0ca87c80e1d3fc363d/FLAG19890acc2 [2022-11-25 22:32:25,346 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/data/075cbabf8/aa347f307ad94a0ca87c80e1d3fc363d [2022-11-25 22:32:25,354 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 22:32:25,356 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 22:32:25,362 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 22:32:25,363 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 22:32:25,367 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 22:32:25,369 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 10:32:25" (1/1) ... [2022-11-25 22:32:25,370 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2548059e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:32:25, skipping insertion in model container [2022-11-25 22:32:25,371 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 10:32:25" (1/1) ... [2022-11-25 22:32:25,380 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 22:32:25,398 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 22:32:25,570 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_c749f351-5bde-4a0d-b6c4-e382939dc277/sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c[465,478] [2022-11-25 22:32:25,589 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 22:32:25,599 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 22:32:25,615 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_c749f351-5bde-4a0d-b6c4-e382939dc277/sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c[465,478] [2022-11-25 22:32:25,622 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 22:32:25,638 INFO L208 MainTranslator]: Completed translation [2022-11-25 22:32:25,638 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:32:25 WrapperNode [2022-11-25 22:32:25,638 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 22:32:25,639 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 22:32:25,640 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 22:32:25,640 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 22:32:25,646 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:32:25" (1/1) ... [2022-11-25 22:32:25,654 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:32:25" (1/1) ... [2022-11-25 22:32:25,673 INFO L138 Inliner]: procedures = 14, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 62 [2022-11-25 22:32:25,674 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 22:32:25,675 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 22:32:25,675 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 22:32:25,675 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 22:32:25,686 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:32:25" (1/1) ... [2022-11-25 22:32:25,687 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:32:25" (1/1) ... [2022-11-25 22:32:25,688 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:32:25" (1/1) ... [2022-11-25 22:32:25,689 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:32:25" (1/1) ... [2022-11-25 22:32:25,692 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:32:25" (1/1) ... [2022-11-25 22:32:25,697 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:32:25" (1/1) ... [2022-11-25 22:32:25,698 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:32:25" (1/1) ... [2022-11-25 22:32:25,699 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:32:25" (1/1) ... [2022-11-25 22:32:25,701 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 22:32:25,702 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 22:32:25,702 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 22:32:25,702 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 22:32:25,703 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:32:25" (1/1) ... [2022-11-25 22:32:25,712 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 22:32:25,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:32:25,741 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 22:32:25,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 22:32:25,789 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 22:32:25,789 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 22:32:25,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 22:32:25,790 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 22:32:25,866 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 22:32:25,869 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 22:32:26,155 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 22:32:26,270 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 22:32:26,270 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-25 22:32:26,273 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 10:32:26 BoogieIcfgContainer [2022-11-25 22:32:26,274 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 22:32:26,276 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 22:32:26,277 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 22:32:26,281 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 22:32:26,281 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 10:32:25" (1/3) ... [2022-11-25 22:32:26,282 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6916d7e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 10:32:26, skipping insertion in model container [2022-11-25 22:32:26,282 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:32:25" (2/3) ... [2022-11-25 22:32:26,283 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6916d7e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 10:32:26, skipping insertion in model container [2022-11-25 22:32:26,283 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 10:32:26" (3/3) ... [2022-11-25 22:32:26,285 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_delay_nd.c [2022-11-25 22:32:26,339 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 22:32:26,340 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-25 22:32:26,448 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 22:32:26,456 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;@42cca9cc, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 22:32:26,471 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-25 22:32:26,476 INFO L276 IsEmpty]: Start isEmpty. Operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:26,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-25 22:32:26,484 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:32:26,485 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-25 22:32:26,485 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:32:26,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:32:26,501 INFO L85 PathProgramCache]: Analyzing trace with hash 108685352, now seen corresponding path program 1 times [2022-11-25 22:32:26,514 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:32:26,517 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [756066649] [2022-11-25 22:32:26,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:32:26,519 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:32:26,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:32:26,806 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:32:26,807 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:32:26,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [756066649] [2022-11-25 22:32:26,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [756066649] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 22:32:26,808 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 22:32:26,809 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 22:32:26,811 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395626287] [2022-11-25 22:32:26,812 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 22:32:26,817 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 22:32:26,818 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:32:26,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 22:32:26,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-25 22:32:26,861 INFO L87 Difference]: Start difference. First operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:26,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:32:26,933 INFO L93 Difference]: Finished difference Result 16 states and 23 transitions. [2022-11-25 22:32:26,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 22:32:26,936 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-25 22:32:26,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:32:26,945 INFO L225 Difference]: With dead ends: 16 [2022-11-25 22:32:26,945 INFO L226 Difference]: Without dead ends: 9 [2022-11-25 22:32:26,955 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-25 22:32:26,960 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 7 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 22:32:26,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 9 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 22:32:26,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2022-11-25 22:32:27,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 8. [2022-11-25 22:32:27,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:27,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2022-11-25 22:32:27,009 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 5 [2022-11-25 22:32:27,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:32:27,010 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2022-11-25 22:32:27,011 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:27,011 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2022-11-25 22:32:27,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-25 22:32:27,011 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:32:27,012 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-25 22:32:27,012 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-25 22:32:27,012 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:32:27,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:32:27,014 INFO L85 PathProgramCache]: Analyzing trace with hash -925984695, now seen corresponding path program 1 times [2022-11-25 22:32:27,014 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:32:27,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734440928] [2022-11-25 22:32:27,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:32:27,015 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:32:27,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:32:27,168 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:32:27,168 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:32:27,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734440928] [2022-11-25 22:32:27,169 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1734440928] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:32:27,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1038686365] [2022-11-25 22:32:27,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:32:27,170 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:32:27,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:32:27,176 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:32:27,205 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 22:32:27,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:32:27,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-25 22:32:27,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:32:27,397 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:32:27,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:32:27,437 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:32:27,438 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1038686365] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:32:27,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [50967895] [2022-11-25 22:32:27,464 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-25 22:32:27,465 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:32:27,482 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:32:27,489 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:32:27,489 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:32:28,689 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:32:29,976 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '91#(and (or (and (= ~last~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= 2 |ULTIMATE.start_main_~b~0#1|) (= |#NULL.base| 0)) (and (or (and (= 3 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1))) (and (= 2 |ULTIMATE.start_main_~b~0#1|) (= 2 |ULTIMATE.start_main_~a~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)))))) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= ~last~0 |ULTIMATE.start_main_~c~0#1|))) (or (and (= |ULTIMATE.start_main_~d~0#1| 0) (or (not (< ~last~0 ~SIZE~0)) (not (= |ULTIMATE.start_main_~st~0#1| 1)))) (and (= |ULTIMATE.start_main_~d~0#1| 1) (< ~last~0 ~SIZE~0) (= |ULTIMATE.start_main_~st~0#1| 1))) (= |#NULL.base| 0))) (<= |ULTIMATE.start_main_~st~0#1| 1) (not (< |ULTIMATE.start_main_~c~0#1| ~SIZE~0)) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 (+ ~last~0 2147483648)) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= ~SIZE~0 200000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (and (= ~SIZE~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|)) 1 0)) (<= ~last~0 2147483647) (<= 0 |#NULL.offset|) (<= 200000 ~SIZE~0) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1))' at error location [2022-11-25 22:32:29,977 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:32:29,977 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:32:29,978 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2022-11-25 22:32:29,979 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1064942161] [2022-11-25 22:32:29,979 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:32:29,980 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-25 22:32:29,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:32:29,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-25 22:32:29,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2022-11-25 22:32:29,982 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:30,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:32:30,049 INFO L93 Difference]: Finished difference Result 19 states and 24 transitions. [2022-11-25 22:32:30,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-25 22:32:30,051 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-25 22:32:30,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:32:30,051 INFO L225 Difference]: With dead ends: 19 [2022-11-25 22:32:30,052 INFO L226 Difference]: Without dead ends: 12 [2022-11-25 22:32:30,054 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=83, Invalid=157, Unknown=0, NotChecked=0, Total=240 [2022-11-25 22:32:30,056 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 18 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 22:32:30,059 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 13 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 22:32:30,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-11-25 22:32:30,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2022-11-25 22:32:30,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:30,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2022-11-25 22:32:30,065 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 6 [2022-11-25 22:32:30,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:32:30,066 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2022-11-25 22:32:30,066 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:30,066 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2022-11-25 22:32:30,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-25 22:32:30,067 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:32:30,067 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1] [2022-11-25 22:32:30,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-25 22:32:30,275 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:32:30,276 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:32:30,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:32:30,277 INFO L85 PathProgramCache]: Analyzing trace with hash 303425640, now seen corresponding path program 2 times [2022-11-25 22:32:30,277 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:32:30,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762895803] [2022-11-25 22:32:30,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:32:30,278 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:32:30,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:32:30,521 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:32:30,522 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:32:30,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762895803] [2022-11-25 22:32:30,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [762895803] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:32:30,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268051824] [2022-11-25 22:32:30,522 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:32:30,523 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:32:30,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:32:30,524 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:32:30,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 22:32:30,600 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 22:32:30,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:32:30,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-25 22:32:30,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:32:30,720 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:32:30,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:32:30,817 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:32:30,818 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [268051824] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:32:30,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1413812861] [2022-11-25 22:32:30,821 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-25 22:32:30,822 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:32:30,822 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:32:30,822 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:32:30,822 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:32:31,508 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:32:32,785 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '215#(and (<= |ULTIMATE.start_main_~st~0#1| 1) (not (< |ULTIMATE.start_main_~c~0#1| ~SIZE~0)) (or (and (<= |ULTIMATE.start_main_~d~0#1| 0) (= ~last~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= 2 |ULTIMATE.start_main_~b~0#1|) (<= 0 |ULTIMATE.start_main_~d~0#1|) (= |#NULL.base| 0)) (and (or (and (= 3 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)) (= |#NULL.base| 0)) (and (or (and (< ~last~0 ~SIZE~0) (<= 1 |ULTIMATE.start_main_~d~0#1|) (= 2 |ULTIMATE.start_main_~b~0#1|) (<= |ULTIMATE.start_main_~d~0#1| 1) (= 2 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~st~0#1| 1) (= |#NULL.base| 0)) (and (= |ULTIMATE.start_main_~d~0#1| 0) (= 2 |ULTIMATE.start_main_~b~0#1|) (= 2 |ULTIMATE.start_main_~a~0#1|) (or (not (< ~last~0 ~SIZE~0)) (not (= |ULTIMATE.start_main_~st~0#1| 1))) (= |#NULL.base| 0))) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)))))) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= ~last~0 |ULTIMATE.start_main_~c~0#1|))))) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 (+ ~last~0 2147483648)) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= ~SIZE~0 200000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (and (= ~SIZE~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|)) 1 0)) (<= ~last~0 2147483647) (<= 0 |#NULL.offset|) (<= 200000 ~SIZE~0) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1))' at error location [2022-11-25 22:32:32,785 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:32:32,786 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:32:32,786 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 18 [2022-11-25 22:32:32,786 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137616970] [2022-11-25 22:32:32,786 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:32:32,787 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-25 22:32:32,787 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:32:32,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-25 22:32:32,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=326, Unknown=0, NotChecked=0, Total=506 [2022-11-25 22:32:32,789 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:32,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:32:32,952 INFO L93 Difference]: Finished difference Result 28 states and 36 transitions. [2022-11-25 22:32:32,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-25 22:32:32,956 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-25 22:32:32,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:32:32,957 INFO L225 Difference]: With dead ends: 28 [2022-11-25 22:32:32,957 INFO L226 Difference]: Without dead ends: 18 [2022-11-25 22:32:32,958 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=260, Invalid=496, Unknown=0, NotChecked=0, Total=756 [2022-11-25 22:32:32,959 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 12 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 22:32:32,960 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 17 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 22:32:32,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-25 22:32:32,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2022-11-25 22:32:32,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:32,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2022-11-25 22:32:32,967 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 9 [2022-11-25 22:32:32,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:32:32,967 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2022-11-25 22:32:32,967 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:32,968 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2022-11-25 22:32:32,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-25 22:32:32,968 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:32:32,968 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1] [2022-11-25 22:32:32,983 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-25 22:32:33,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:32:33,169 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:32:33,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:32:33,170 INFO L85 PathProgramCache]: Analyzing trace with hash -431543096, now seen corresponding path program 3 times [2022-11-25 22:32:33,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:32:33,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181230061] [2022-11-25 22:32:33,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:32:33,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:32:33,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:32:33,541 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:32:33,541 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:32:33,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1181230061] [2022-11-25 22:32:33,542 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1181230061] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:32:33,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [61168488] [2022-11-25 22:32:33,542 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 22:32:33,542 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:32:33,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:32:33,544 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:32:33,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-25 22:32:33,616 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 22:32:33,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:32:33,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-25 22:32:33,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:32:33,844 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:32:33,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:32:34,146 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:32:34,147 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [61168488] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:32:34,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1370916583] [2022-11-25 22:32:34,157 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-25 22:32:34,160 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:32:34,161 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:32:34,163 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:32:34,164 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:32:34,594 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:32:35,701 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '429#(and (<= |ULTIMATE.start_main_~st~0#1| 1) (not (< |ULTIMATE.start_main_~c~0#1| ~SIZE~0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= ~SIZE~0 200000) (or (and (= 3 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1))) (and (or (and (= ~last~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= 2 |ULTIMATE.start_main_~b~0#1|)) (and (= 2 |ULTIMATE.start_main_~b~0#1|) (= 2 |ULTIMATE.start_main_~a~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= ~last~0 |ULTIMATE.start_main_~c~0#1|))) (or (and (= |ULTIMATE.start_main_~d~0#1| 0) (or (not (< ~last~0 ~SIZE~0)) (not (= |ULTIMATE.start_main_~st~0#1| 1)))) (and (= |ULTIMATE.start_main_~d~0#1| 1) (< ~last~0 ~SIZE~0) (= |ULTIMATE.start_main_~st~0#1| 1))))) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)))))) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 (+ ~last~0 2147483648)) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (and (= ~SIZE~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|)) 1 0)) (<= ~last~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-25 22:32:35,702 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:32:35,702 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:32:35,702 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 36 [2022-11-25 22:32:35,702 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456704663] [2022-11-25 22:32:35,703 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:32:35,703 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-25 22:32:35,703 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:32:35,705 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-25 22:32:35,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=1010, Unknown=0, NotChecked=0, Total=1640 [2022-11-25 22:32:35,706 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 37 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 36 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:36,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:32:36,057 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2022-11-25 22:32:36,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-25 22:32:36,059 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 36 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-25 22:32:36,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:32:36,060 INFO L225 Difference]: With dead ends: 46 [2022-11-25 22:32:36,060 INFO L226 Difference]: Without dead ends: 30 [2022-11-25 22:32:36,062 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1001 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=938, Invalid=1714, Unknown=0, NotChecked=0, Total=2652 [2022-11-25 22:32:36,063 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 36 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:32:36,063 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 17 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:32:36,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-25 22:32:36,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2022-11-25 22:32:36,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:36,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2022-11-25 22:32:36,070 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 15 [2022-11-25 22:32:36,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:32:36,070 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2022-11-25 22:32:36,071 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 36 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:36,071 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2022-11-25 22:32:36,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-25 22:32:36,072 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:32:36,072 INFO L195 NwaCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1] [2022-11-25 22:32:36,079 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-25 22:32:36,278 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:32:36,278 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:32:36,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:32:36,278 INFO L85 PathProgramCache]: Analyzing trace with hash 1633246600, now seen corresponding path program 4 times [2022-11-25 22:32:36,278 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:32:36,279 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313348281] [2022-11-25 22:32:36,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:32:36,279 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:32:36,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:32:36,981 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:32:36,981 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:32:36,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313348281] [2022-11-25 22:32:36,982 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [313348281] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:32:36,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1378489929] [2022-11-25 22:32:36,982 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 22:32:36,982 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:32:36,982 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:32:36,983 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:32:36,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-25 22:32:37,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:32:37,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-25 22:32:37,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:32:37,731 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:32:37,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:32:38,719 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:32:38,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1378489929] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:32:38,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1672855247] [2022-11-25 22:32:38,722 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-25 22:32:38,723 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:32:38,723 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:32:38,723 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:32:38,724 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:32:39,333 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:32:40,516 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '823#(and (or (and (or (and (= 2 |ULTIMATE.start_main_~a~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= ~last~0 |ULTIMATE.start_main_~c~0#1|))) (or (and (= |ULTIMATE.start_main_~d~0#1| 0) (or (not (< ~last~0 ~SIZE~0)) (not (= |ULTIMATE.start_main_~st~0#1| 1)))) (and (= |ULTIMATE.start_main_~d~0#1| 1) (< ~last~0 ~SIZE~0) (= |ULTIMATE.start_main_~st~0#1| 1)))) (and (= ~last~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|))) (= 2 |ULTIMATE.start_main_~b~0#1|) (= |#NULL.offset| 0) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)))) (= |#NULL.base| 0)) (and (= 3 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))) (<= |ULTIMATE.start_main_~st~0#1| 1) (not (< |ULTIMATE.start_main_~c~0#1| ~SIZE~0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 (+ ~last~0 2147483648)) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= ~SIZE~0 200000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (and (= ~SIZE~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|)) 1 0)) (<= ~last~0 2147483647) (<= 200000 ~SIZE~0) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1))' at error location [2022-11-25 22:32:40,516 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:32:40,516 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:32:40,516 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 72 [2022-11-25 22:32:40,516 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673238656] [2022-11-25 22:32:40,516 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:32:40,517 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-11-25 22:32:40,517 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:32:40,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-11-25 22:32:40,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2394, Invalid=3458, Unknown=0, NotChecked=0, Total=5852 [2022-11-25 22:32:40,523 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 73 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 72 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:41,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:32:41,833 INFO L93 Difference]: Finished difference Result 82 states and 108 transitions. [2022-11-25 22:32:41,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-25 22:32:41,834 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 72 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-11-25 22:32:41,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:32:41,835 INFO L225 Difference]: With dead ends: 82 [2022-11-25 22:32:41,835 INFO L226 Difference]: Without dead ends: 54 [2022-11-25 22:32:41,840 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3749 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3590, Invalid=6310, Unknown=0, NotChecked=0, Total=9900 [2022-11-25 22:32:41,841 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 30 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:32:41,841 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 25 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:32:41,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-11-25 22:32:41,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2022-11-25 22:32:41,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.0384615384615385) internal successors, (54), 52 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:41,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2022-11-25 22:32:41,865 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 27 [2022-11-25 22:32:41,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:32:41,866 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2022-11-25 22:32:41,866 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 72 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:41,867 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2022-11-25 22:32:41,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-25 22:32:41,870 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:32:41,870 INFO L195 NwaCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1] [2022-11-25 22:32:41,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-25 22:32:42,077 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:32:42,077 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:32:42,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:32:42,078 INFO L85 PathProgramCache]: Analyzing trace with hash 1554276104, now seen corresponding path program 5 times [2022-11-25 22:32:42,078 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:32:42,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1964267829] [2022-11-25 22:32:42,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:32:42,078 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:32:42,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:32:44,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:32:44,699 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:32:44,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1964267829] [2022-11-25 22:32:44,700 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1964267829] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:32:44,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [496094600] [2022-11-25 22:32:44,700 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:32:44,700 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:32:44,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:32:44,704 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:32:44,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-25 22:32:44,868 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2022-11-25 22:32:44,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:32:44,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-25 22:32:44,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:32:46,625 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:32:46,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:32:50,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:32:50,364 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [496094600] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:32:50,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [162079632] [2022-11-25 22:32:50,366 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-25 22:32:50,367 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:32:50,367 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:32:50,367 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:32:50,368 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:32:50,876 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:32:52,066 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1577#(and (or (and (or (and (= 2 |ULTIMATE.start_main_~a~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= ~last~0 |ULTIMATE.start_main_~c~0#1|))) (or (and (= |ULTIMATE.start_main_~d~0#1| 0) (or (not (< ~last~0 ~SIZE~0)) (not (= |ULTIMATE.start_main_~st~0#1| 1)))) (and (= |ULTIMATE.start_main_~d~0#1| 1) (< ~last~0 ~SIZE~0) (= |ULTIMATE.start_main_~st~0#1| 1)))) (and (= ~last~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|))) (= 2 |ULTIMATE.start_main_~b~0#1|) (= |#NULL.offset| 0) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)))) (= |#NULL.base| 0)) (and (= 3 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))) (<= |ULTIMATE.start_main_~st~0#1| 1) (not (< |ULTIMATE.start_main_~c~0#1| ~SIZE~0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 (+ ~last~0 2147483648)) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= ~SIZE~0 200000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (and (= ~SIZE~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|)) 1 0)) (<= ~last~0 2147483647) (<= 200000 ~SIZE~0) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1))' at error location [2022-11-25 22:32:52,066 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:32:52,067 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:32:52,067 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 144 [2022-11-25 22:32:52,067 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851326644] [2022-11-25 22:32:52,067 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:32:52,071 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 145 states [2022-11-25 22:32:52,071 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:32:52,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 145 interpolants. [2022-11-25 22:32:52,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9378, Invalid=12674, Unknown=0, NotChecked=0, Total=22052 [2022-11-25 22:32:52,085 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand has 145 states, 145 states have (on average 1.0206896551724138) internal successors, (148), 144 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:55,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:32:55,866 INFO L93 Difference]: Finished difference Result 154 states and 204 transitions. [2022-11-25 22:32:55,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2022-11-25 22:32:55,867 INFO L78 Accepts]: Start accepts. Automaton has has 145 states, 145 states have (on average 1.0206896551724138) internal successors, (148), 144 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2022-11-25 22:32:55,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:32:55,868 INFO L225 Difference]: With dead ends: 154 [2022-11-25 22:32:55,869 INFO L226 Difference]: Without dead ends: 102 [2022-11-25 22:32:55,876 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14429 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=14078, Invalid=24142, Unknown=0, NotChecked=0, Total=38220 [2022-11-25 22:32:55,877 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 54 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 22:32:55,877 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 25 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 22:32:55,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-11-25 22:32:55,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2022-11-25 22:32:55,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 100 states have (on average 1.02) internal successors, (102), 100 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:55,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 102 transitions. [2022-11-25 22:32:55,892 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 102 transitions. Word has length 51 [2022-11-25 22:32:55,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:32:55,893 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 102 transitions. [2022-11-25 22:32:55,894 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 145 states, 145 states have (on average 1.0206896551724138) internal successors, (148), 144 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:32:55,894 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 102 transitions. [2022-11-25 22:32:55,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-11-25 22:32:55,897 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:32:55,897 INFO L195 NwaCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1] [2022-11-25 22:32:55,911 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-25 22:32:56,108 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-25 22:32:56,108 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:32:56,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:32:56,109 INFO L85 PathProgramCache]: Analyzing trace with hash -1760239096, now seen corresponding path program 6 times [2022-11-25 22:32:56,109 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:32:56,109 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31743572] [2022-11-25 22:32:56,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:32:56,109 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:32:56,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:33:03,671 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:33:03,671 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:33:03,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31743572] [2022-11-25 22:33:03,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31743572] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:33:03,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2022721402] [2022-11-25 22:33:03,671 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 22:33:03,672 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:33:03,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:33:03,674 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:33:03,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-25 22:33:03,844 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 22:33:03,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:33:03,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 97 conjunts are in the unsatisfiable core [2022-11-25 22:33:03,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:33:09,906 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:33:09,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:33:24,139 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:33:24,140 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2022721402] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:33:24,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [107685336] [2022-11-25 22:33:24,142 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-25 22:33:24,142 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:33:24,142 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:33:24,142 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:33:24,142 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:33:24,677 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:33:26,206 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3051#(and (<= |ULTIMATE.start_main_~st~0#1| 1) (not (< |ULTIMATE.start_main_~c~0#1| ~SIZE~0)) (or (and (= 3 |ULTIMATE.start_main_~b~0#1|) (= ~SIZE~0 200000) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= ~SIZE~0 200000) (or (and (= 2 |ULTIMATE.start_main_~a~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= ~last~0 |ULTIMATE.start_main_~c~0#1|))) (or (and (= |ULTIMATE.start_main_~d~0#1| 0) (or (not (< ~last~0 ~SIZE~0)) (not (= |ULTIMATE.start_main_~st~0#1| 1)))) (and (= |ULTIMATE.start_main_~d~0#1| 1) (< ~last~0 ~SIZE~0) (= |ULTIMATE.start_main_~st~0#1| 1)))) (and (= ~last~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|))) (= 2 |ULTIMATE.start_main_~b~0#1|) (= |#NULL.offset| 0) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)))) (= |#NULL.base| 0))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 (+ ~last~0 2147483648)) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (and (= ~SIZE~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|)) 1 0)) (<= ~last~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1))' at error location [2022-11-25 22:33:26,206 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:33:26,206 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:33:26,207 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 288 [2022-11-25 22:33:26,207 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710242557] [2022-11-25 22:33:26,207 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:33:26,208 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 289 states [2022-11-25 22:33:26,208 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:33:26,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 289 interpolants. [2022-11-25 22:33:26,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37170, Invalid=48386, Unknown=0, NotChecked=0, Total=85556 [2022-11-25 22:33:26,229 INFO L87 Difference]: Start difference. First operand 101 states and 102 transitions. Second operand has 289 states, 289 states have (on average 1.0103806228373702) internal successors, (292), 288 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:33:40,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:33:40,599 INFO L93 Difference]: Finished difference Result 298 states and 396 transitions. [2022-11-25 22:33:40,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 193 states. [2022-11-25 22:33:40,600 INFO L78 Accepts]: Start accepts. Automaton has has 289 states, 289 states have (on average 1.0103806228373702) internal successors, (292), 288 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 99 [2022-11-25 22:33:40,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:33:40,602 INFO L225 Difference]: With dead ends: 298 [2022-11-25 22:33:40,603 INFO L226 Difference]: Without dead ends: 198 [2022-11-25 22:33:40,615 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 386 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56525 ImplicationChecksByTransitivity, 39.1s TimeCoverageRelationStatistics Valid=55790, Invalid=94366, Unknown=0, NotChecked=0, Total=150156 [2022-11-25 22:33:40,617 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 102 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 22:33:40,617 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 17 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 22:33:40,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2022-11-25 22:33:40,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 197. [2022-11-25 22:33:40,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 196 states have (on average 1.010204081632653) internal successors, (198), 196 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:33:40,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 198 transitions. [2022-11-25 22:33:40,645 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 198 transitions. Word has length 99 [2022-11-25 22:33:40,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:33:40,645 INFO L495 AbstractCegarLoop]: Abstraction has 197 states and 198 transitions. [2022-11-25 22:33:40,646 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 289 states, 289 states have (on average 1.0103806228373702) internal successors, (292), 288 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:33:40,646 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 198 transitions. [2022-11-25 22:33:40,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2022-11-25 22:33:40,650 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:33:40,650 INFO L195 NwaCegarLoop]: trace histogram [190, 1, 1, 1, 1, 1] [2022-11-25 22:33:40,664 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-25 22:33:40,858 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-25 22:33:40,859 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:33:40,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:33:40,859 INFO L85 PathProgramCache]: Analyzing trace with hash 1432348680, now seen corresponding path program 7 times [2022-11-25 22:33:40,859 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:33:40,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751962465] [2022-11-25 22:33:40,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:33:40,859 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:33:41,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:34:07,782 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:34:07,782 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:34:07,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751962465] [2022-11-25 22:34:07,783 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [751962465] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:34:07,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [622272162] [2022-11-25 22:34:07,783 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 22:34:07,783 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:34:07,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:34:07,784 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:34:07,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-25 22:34:08,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:34:08,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 819 conjuncts, 193 conjunts are in the unsatisfiable core [2022-11-25 22:34:08,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:34:28,724 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:34:28,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:35:24,531 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:35:24,531 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [622272162] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:35:24,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [139404567] [2022-11-25 22:35:24,534 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-25 22:35:24,534 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:35:24,534 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:35:24,534 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:35:24,535 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:35:25,064 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:35:27,434 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5965#(and (<= 0 |#NULL.base|) (<= |ULTIMATE.start_main_~st~0#1| 1) (not (< |ULTIMATE.start_main_~c~0#1| ~SIZE~0)) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 (+ ~last~0 2147483648)) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |#NULL.base| 0) (<= ~SIZE~0 200000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (and (= ~SIZE~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|)) 1 0)) (<= ~last~0 2147483647) (<= 0 |#NULL.offset|) (<= 200000 ~SIZE~0) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (or (and (<= |ULTIMATE.start_main_~d~0#1| 0) (= ~last~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= 2 |ULTIMATE.start_main_~b~0#1|) (<= 0 |ULTIMATE.start_main_~d~0#1|)) (and (or (and (< ~last~0 ~SIZE~0) (<= 1 |ULTIMATE.start_main_~d~0#1|) (= 2 |ULTIMATE.start_main_~b~0#1|) (<= |ULTIMATE.start_main_~d~0#1| 1) (= 2 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~st~0#1| 1)) (and (or (and (= 3 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1))) (and (= |ULTIMATE.start_main_~d~0#1| 0) (= 2 |ULTIMATE.start_main_~b~0#1|) (= 2 |ULTIMATE.start_main_~a~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)))))) (or (not (< ~last~0 ~SIZE~0)) (not (= |ULTIMATE.start_main_~st~0#1| 1))))) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= ~last~0 |ULTIMATE.start_main_~c~0#1|))))) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1))' at error location [2022-11-25 22:35:27,434 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:35:27,434 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:35:27,435 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193, 193] total 576 [2022-11-25 22:35:27,435 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305652837] [2022-11-25 22:35:27,435 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:35:27,436 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 577 states [2022-11-25 22:35:27,436 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:35:27,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 577 interpolants. [2022-11-25 22:35:27,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148050, Invalid=188930, Unknown=0, NotChecked=0, Total=336980 [2022-11-25 22:35:27,470 INFO L87 Difference]: Start difference. First operand 197 states and 198 transitions. Second operand has 577 states, 577 states have (on average 1.0051993067590987) internal successors, (580), 576 states have internal predecessors, (580), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:36:24,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:36:24,357 INFO L93 Difference]: Finished difference Result 586 states and 780 transitions. [2022-11-25 22:36:24,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 385 states. [2022-11-25 22:36:24,359 INFO L78 Accepts]: Start accepts. Automaton has has 577 states, 577 states have (on average 1.0051993067590987) internal successors, (580), 576 states have internal predecessors, (580), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 195 [2022-11-25 22:36:24,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:36:24,362 INFO L225 Difference]: With dead ends: 586 [2022-11-25 22:36:24,362 INFO L226 Difference]: Without dead ends: 390 [2022-11-25 22:36:24,396 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 967 GetRequests, 197 SyntacticMatches, 0 SemanticMatches, 770 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223661 ImplicationChecksByTransitivity, 148.0s TimeCoverageRelationStatistics Valid=222158, Invalid=373054, Unknown=0, NotChecked=0, Total=595212 [2022-11-25 22:36:24,396 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 198 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 499 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 505 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 499 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-25 22:36:24,397 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [198 Valid, 49 Invalid, 505 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 499 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-25 22:36:24,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2022-11-25 22:36:24,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 389. [2022-11-25 22:36:24,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 389 states, 388 states have (on average 1.0051546391752577) internal successors, (390), 388 states have internal predecessors, (390), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:36:24,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 389 states to 389 states and 390 transitions. [2022-11-25 22:36:24,440 INFO L78 Accepts]: Start accepts. Automaton has 389 states and 390 transitions. Word has length 195 [2022-11-25 22:36:24,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:36:24,440 INFO L495 AbstractCegarLoop]: Abstraction has 389 states and 390 transitions. [2022-11-25 22:36:24,441 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 577 states, 577 states have (on average 1.0051993067590987) internal successors, (580), 576 states have internal predecessors, (580), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:36:24,442 INFO L276 IsEmpty]: Start isEmpty. Operand 389 states and 390 transitions. [2022-11-25 22:36:24,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 388 [2022-11-25 22:36:24,450 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:36:24,450 INFO L195 NwaCegarLoop]: trace histogram [382, 1, 1, 1, 1, 1] [2022-11-25 22:36:24,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-25 22:36:24,659 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:36:24,659 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:36:24,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:36:24,659 INFO L85 PathProgramCache]: Analyzing trace with hash -945949688, now seen corresponding path program 8 times [2022-11-25 22:36:24,660 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:36:24,660 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675669852] [2022-11-25 22:36:24,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:36:24,660 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:36:26,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:38:03,034 INFO L134 CoverageAnalysis]: Checked inductivity of 73153 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:38:03,035 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:38:03,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675669852] [2022-11-25 22:38:03,035 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [675669852] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:38:03,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [915292816] [2022-11-25 22:38:03,035 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:38:03,036 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:38:03,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:38:03,042 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:38:03,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c749f351-5bde-4a0d-b6c4-e382939dc277/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-25 22:38:05,823 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 192 check-sat command(s) [2022-11-25 22:38:05,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:38:05,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 1587 conjuncts, 385 conjunts are in the unsatisfiable core [2022-11-25 22:38:05,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:39:17,347 INFO L134 CoverageAnalysis]: Checked inductivity of 73153 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:39:17,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:42:54,104 INFO L134 CoverageAnalysis]: Checked inductivity of 73153 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:42:54,105 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [915292816] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:42:54,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1998879122] [2022-11-25 22:42:54,106 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-25 22:42:54,107 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:42:54,107 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:42:54,107 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:42:54,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:42:54,436 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:42:57,391 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11759#(and (<= |ULTIMATE.start_main_~st~0#1| 1) (not (< |ULTIMATE.start_main_~c~0#1| ~SIZE~0)) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 (+ ~last~0 2147483648)) (or (and (= 3 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1))) (and (or (and (= 2 |ULTIMATE.start_main_~a~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= ~last~0 |ULTIMATE.start_main_~c~0#1|))) (or (and (= |ULTIMATE.start_main_~d~0#1| 0) (or (not (< ~last~0 ~SIZE~0)) (not (= |ULTIMATE.start_main_~st~0#1| 1)))) (and (= |ULTIMATE.start_main_~d~0#1| 1) (< ~last~0 ~SIZE~0) (= |ULTIMATE.start_main_~st~0#1| 1)))) (and (= ~last~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|))) (= 2 |ULTIMATE.start_main_~b~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)))))) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= ~SIZE~0 200000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (and (= ~SIZE~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|)) 1 0)) (<= ~last~0 2147483647) (<= 0 |#NULL.offset|) (<= 200000 ~SIZE~0) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-25 22:42:57,391 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:42:57,391 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:42:57,392 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [385, 385, 385] total 1152 [2022-11-25 22:42:57,392 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482130207] [2022-11-25 22:42:57,392 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:42:57,394 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 1153 states [2022-11-25 22:42:57,395 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:42:57,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 1153 interpolants. [2022-11-25 22:42:57,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=590994, Invalid=746498, Unknown=0, NotChecked=0, Total=1337492 [2022-11-25 22:42:57,549 INFO L87 Difference]: Start difference. First operand 389 states and 390 transitions. Second operand has 1153 states, 1153 states have (on average 1.002601908065915) internal successors, (1156), 1152 states have internal predecessors, (1156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)