./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound100.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound100.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash f5161832faa85efa7698287d22f9a23de4fa8b958c1b2d2c225d3d8c999a24ce --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 10:01:12,307 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 10:01:12,309 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 10:01:12,320 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 10:01:12,320 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 10:01:12,321 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 10:01:12,322 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 10:01:12,323 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 10:01:12,324 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 10:01:12,324 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 10:01:12,325 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 10:01:12,325 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 10:01:12,325 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 10:01:12,326 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 10:01:12,327 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 10:01:12,327 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 10:01:12,328 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 10:01:12,329 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 10:01:12,329 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 10:01:12,330 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 10:01:12,331 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 10:01:12,332 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 10:01:12,333 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 10:01:12,333 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 10:01:12,335 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 10:01:12,336 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 10:01:12,336 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 10:01:12,336 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 10:01:12,337 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 10:01:12,337 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 10:01:12,337 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 10:01:12,338 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 10:01:12,338 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 10:01:12,339 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 10:01:12,339 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 10:01:12,339 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 10:01:12,340 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 10:01:12,340 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 10:01:12,340 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 10:01:12,340 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 10:01:12,341 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 10:01:12,342 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 10:01:12,355 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 10:01:12,355 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 10:01:12,355 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 10:01:12,355 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 10:01:12,356 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 10:01:12,356 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 10:01:12,356 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 10:01:12,356 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 10:01:12,356 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 10:01:12,356 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 10:01:12,356 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 10:01:12,356 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 10:01:12,356 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 10:01:12,357 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 10:01:12,357 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 10:01:12,357 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 10:01:12,357 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 10:01:12,357 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 10:01:12,357 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 10:01:12,358 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 10:01:12,358 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 10:01:12,358 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 10:01:12,358 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 10:01:12,358 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 10:01:12,358 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 10:01:12,358 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 10:01:12,358 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 10:01:12,358 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 10:01:12,358 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 10:01:12,358 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 10:01:12,359 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 10:01:12,359 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 10:01:12,359 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 10:01:12,359 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 10:01:12,359 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 10:01:12,359 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 10:01:12,359 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 10:01:12,359 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 10:01:12,359 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 10:01:12,359 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 10:01:12,360 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 10:01:12,360 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_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f5161832faa85efa7698287d22f9a23de4fa8b958c1b2d2c225d3d8c999a24ce [2022-12-14 10:01:12,529 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 10:01:12,545 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 10:01:12,547 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 10:01:12,548 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 10:01:12,548 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 10:01:12,549 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound100.c [2022-12-14 10:01:15,177 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 10:01:15,315 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 10:01:15,316 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound100.c [2022-12-14 10:01:15,320 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/data/3039d7d52/ad2f227fc12f49119a243bddce2d9aaa/FLAG59a849d5e [2022-12-14 10:01:15,331 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/data/3039d7d52/ad2f227fc12f49119a243bddce2d9aaa [2022-12-14 10:01:15,333 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 10:01:15,334 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 10:01:15,335 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 10:01:15,335 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 10:01:15,338 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 10:01:15,338 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 10:01:15" (1/1) ... [2022-12-14 10:01:15,339 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@30aa50ff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:01:15, skipping insertion in model container [2022-12-14 10:01:15,339 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 10:01:15" (1/1) ... [2022-12-14 10:01:15,344 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 10:01:15,354 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 10:01:15,461 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_922d8144-2625-4f04-927c-a467196f2f29/sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound100.c[489,502] [2022-12-14 10:01:15,474 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 10:01:15,482 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 10:01:15,491 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_922d8144-2625-4f04-927c-a467196f2f29/sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound100.c[489,502] [2022-12-14 10:01:15,496 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 10:01:15,506 INFO L208 MainTranslator]: Completed translation [2022-12-14 10:01:15,507 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:01:15 WrapperNode [2022-12-14 10:01:15,507 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 10:01:15,508 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 10:01:15,508 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 10:01:15,508 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 10:01:15,513 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:01:15" (1/1) ... [2022-12-14 10:01:15,518 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:01:15" (1/1) ... [2022-12-14 10:01:15,531 INFO L138 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 59 [2022-12-14 10:01:15,531 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 10:01:15,532 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 10:01:15,532 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 10:01:15,532 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 10:01:15,539 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:01:15" (1/1) ... [2022-12-14 10:01:15,539 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:01:15" (1/1) ... [2022-12-14 10:01:15,540 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:01:15" (1/1) ... [2022-12-14 10:01:15,540 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:01:15" (1/1) ... [2022-12-14 10:01:15,542 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:01:15" (1/1) ... [2022-12-14 10:01:15,544 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:01:15" (1/1) ... [2022-12-14 10:01:15,545 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:01:15" (1/1) ... [2022-12-14 10:01:15,546 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:01:15" (1/1) ... [2022-12-14 10:01:15,547 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 10:01:15,547 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 10:01:15,547 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 10:01:15,547 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 10:01:15,548 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:01:15" (1/1) ... [2022-12-14 10:01:15,553 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 10:01:15,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:15,570 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 10:01:15,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 10:01:15,599 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 10:01:15,599 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-12-14 10:01:15,599 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-12-14 10:01:15,599 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 10:01:15,599 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 10:01:15,599 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 10:01:15,599 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-12-14 10:01:15,599 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-12-14 10:01:15,656 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 10:01:15,658 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 10:01:15,775 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 10:01:15,797 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 10:01:15,798 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-12-14 10:01:15,799 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 10:01:15 BoogieIcfgContainer [2022-12-14 10:01:15,799 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 10:01:15,801 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 10:01:15,801 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 10:01:15,803 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 10:01:15,803 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 10:01:15" (1/3) ... [2022-12-14 10:01:15,804 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b939f1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 10:01:15, skipping insertion in model container [2022-12-14 10:01:15,804 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:01:15" (2/3) ... [2022-12-14 10:01:15,804 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b939f1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 10:01:15, skipping insertion in model container [2022-12-14 10:01:15,804 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 10:01:15" (3/3) ... [2022-12-14 10:01:15,805 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd-ll_unwindbound100.c [2022-12-14 10:01:15,819 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 10:01:15,819 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 10:01:15,855 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 10:01:15,860 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;@46bc2007, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 10:01:15,860 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 10:01:15,864 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-12-14 10:01:15,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-12-14 10:01:15,870 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:15,870 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:15,871 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:15,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:15,875 INFO L85 PathProgramCache]: Analyzing trace with hash 1798315609, now seen corresponding path program 1 times [2022-12-14 10:01:15,882 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:15,883 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803367951] [2022-12-14 10:01:15,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:15,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:15,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:15,995 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 10:01:15,996 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:15,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803367951] [2022-12-14 10:01:15,997 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803367951] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 10:01:15,997 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 10:01:15,997 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 10:01:15,998 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706600393] [2022-12-14 10:01:15,999 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 10:01:16,002 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-12-14 10:01:16,003 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:16,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-12-14 10:01:16,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-12-14 10:01:16,026 INFO L87 Difference]: Start difference. First operand has 24 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 10:01:16,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:16,051 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2022-12-14 10:01:16,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-12-14 10:01:16,053 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2022-12-14 10:01:16,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:16,059 INFO L225 Difference]: With dead ends: 42 [2022-12-14 10:01:16,059 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 10:01:16,061 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-12-14 10:01:16,064 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:16,064 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 10:01:16,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 10:01:16,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-12-14 10:01:16,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-12-14 10:01:16,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 30 transitions. [2022-12-14 10:01:16,091 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 30 transitions. Word has length 13 [2022-12-14 10:01:16,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:16,092 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 30 transitions. [2022-12-14 10:01:16,092 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 10:01:16,092 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 30 transitions. [2022-12-14 10:01:16,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 10:01:16,093 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:16,093 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:16,093 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 10:01:16,093 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:16,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:16,094 INFO L85 PathProgramCache]: Analyzing trace with hash -740021117, now seen corresponding path program 1 times [2022-12-14 10:01:16,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:16,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124830136] [2022-12-14 10:01:16,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:16,095 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:16,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:16,183 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 10:01:16,183 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:16,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124830136] [2022-12-14 10:01:16,183 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2124830136] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 10:01:16,183 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 10:01:16,184 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 10:01:16,184 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763087993] [2022-12-14 10:01:16,184 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 10:01:16,185 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 10:01:16,185 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:16,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 10:01:16,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 10:01:16,186 INFO L87 Difference]: Start difference. First operand 22 states and 30 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 10:01:16,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:16,209 INFO L93 Difference]: Finished difference Result 34 states and 45 transitions. [2022-12-14 10:01:16,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 10:01:16,210 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2022-12-14 10:01:16,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:16,210 INFO L225 Difference]: With dead ends: 34 [2022-12-14 10:01:16,210 INFO L226 Difference]: Without dead ends: 24 [2022-12-14 10:01:16,211 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 10:01:16,212 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 3 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:16,212 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 69 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 10:01:16,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-12-14 10:01:16,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-12-14 10:01:16,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-12-14 10:01:16,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2022-12-14 10:01:16,217 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 14 [2022-12-14 10:01:16,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:16,218 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2022-12-14 10:01:16,218 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 10:01:16,218 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2022-12-14 10:01:16,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 10:01:16,218 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:16,218 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:16,219 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 10:01:16,219 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:16,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:16,219 INFO L85 PathProgramCache]: Analyzing trace with hash -738352821, now seen corresponding path program 1 times [2022-12-14 10:01:16,220 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:16,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204221539] [2022-12-14 10:01:16,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:16,220 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:16,232 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 10:01:16,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1869965888] [2022-12-14 10:01:16,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:16,232 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:16,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:16,234 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:16,235 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 10:01:16,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:16,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 17 conjunts are in the unsatisfiable core [2022-12-14 10:01:16,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:16,409 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 10:01:16,409 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 10:01:16,410 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:16,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204221539] [2022-12-14 10:01:16,410 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 10:01:16,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1869965888] [2022-12-14 10:01:16,410 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1869965888] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 10:01:16,411 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 10:01:16,411 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-12-14 10:01:16,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749299262] [2022-12-14 10:01:16,411 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 10:01:16,412 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 10:01:16,412 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:16,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 10:01:16,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-12-14 10:01:16,413 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 10:01:16,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:16,495 INFO L93 Difference]: Finished difference Result 38 states and 52 transitions. [2022-12-14 10:01:16,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 10:01:16,496 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2022-12-14 10:01:16,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:16,497 INFO L225 Difference]: With dead ends: 38 [2022-12-14 10:01:16,497 INFO L226 Difference]: Without dead ends: 36 [2022-12-14 10:01:16,497 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-12-14 10:01:16,499 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 6 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:16,499 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 109 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 10:01:16,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-12-14 10:01:16,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2022-12-14 10:01:16,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 16 states have (on average 1.25) internal successors, (20), 18 states have internal predecessors, (20), 15 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-12-14 10:01:16,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 49 transitions. [2022-12-14 10:01:16,510 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 49 transitions. Word has length 14 [2022-12-14 10:01:16,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:16,510 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 49 transitions. [2022-12-14 10:01:16,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 10:01:16,511 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 49 transitions. [2022-12-14 10:01:16,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 10:01:16,511 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:16,511 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:16,518 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 10:01:16,712 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:16,714 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:16,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:16,716 INFO L85 PathProgramCache]: Analyzing trace with hash 1930727335, now seen corresponding path program 1 times [2022-12-14 10:01:16,717 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:16,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [6708031] [2022-12-14 10:01:16,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:16,718 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:16,753 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 10:01:16,754 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [181048314] [2022-12-14 10:01:16,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:16,755 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:16,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:16,758 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:16,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 10:01:16,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:16,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 10:01:16,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:17,043 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 10:01:17,043 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 10:01:17,043 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:17,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [6708031] [2022-12-14 10:01:17,044 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 10:01:17,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [181048314] [2022-12-14 10:01:17,044 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [181048314] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 10:01:17,044 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 10:01:17,044 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-12-14 10:01:17,044 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225113007] [2022-12-14 10:01:17,045 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 10:01:17,045 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 10:01:17,045 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:17,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 10:01:17,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-12-14 10:01:17,046 INFO L87 Difference]: Start difference. First operand 35 states and 49 transitions. Second operand has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-12-14 10:01:17,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:17,146 INFO L93 Difference]: Finished difference Result 42 states and 55 transitions. [2022-12-14 10:01:17,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 10:01:17,147 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 19 [2022-12-14 10:01:17,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:17,148 INFO L225 Difference]: With dead ends: 42 [2022-12-14 10:01:17,148 INFO L226 Difference]: Without dead ends: 40 [2022-12-14 10:01:17,148 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2022-12-14 10:01:17,149 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 13 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:17,149 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 102 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 10:01:17,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-12-14 10:01:17,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2022-12-14 10:01:17,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 21 states have internal predecessors, (23), 15 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-12-14 10:01:17,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 52 transitions. [2022-12-14 10:01:17,157 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 52 transitions. Word has length 19 [2022-12-14 10:01:17,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:17,157 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 52 transitions. [2022-12-14 10:01:17,157 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-12-14 10:01:17,157 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 52 transitions. [2022-12-14 10:01:17,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 10:01:17,158 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:17,158 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:17,164 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 10:01:17,359 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:17,361 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:17,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:17,363 INFO L85 PathProgramCache]: Analyzing trace with hash -1875029365, now seen corresponding path program 1 times [2022-12-14 10:01:17,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:17,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877801064] [2022-12-14 10:01:17,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:17,365 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:17,403 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 10:01:17,404 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1820654116] [2022-12-14 10:01:17,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:17,406 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:17,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:17,410 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:17,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 10:01:17,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:17,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 23 conjunts are in the unsatisfiable core [2022-12-14 10:01:17,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:17,709 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 10:01:17,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:17,802 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:17,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877801064] [2022-12-14 10:01:17,802 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 10:01:17,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1820654116] [2022-12-14 10:01:17,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1820654116] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:01:17,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [901971841] [2022-12-14 10:01:17,816 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:01:17,816 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:01:17,819 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 10:01:17,823 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 10:01:17,823 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 10:01:18,202 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-12-14 10:01:18,213 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 10:01:18,240 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 10:01:19,189 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [901971841] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 10:01:19,189 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 10:01:19,189 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [10] total 20 [2022-12-14 10:01:19,190 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991539119] [2022-12-14 10:01:19,190 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 10:01:19,190 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-12-14 10:01:19,190 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:19,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-12-14 10:01:19,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=418, Unknown=0, NotChecked=0, Total=506 [2022-12-14 10:01:19,191 INFO L87 Difference]: Start difference. First operand 39 states and 52 transitions. Second operand has 12 states, 8 states have (on average 1.25) internal successors, (10), 7 states have internal predecessors, (10), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-12-14 10:01:19,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:19,391 INFO L93 Difference]: Finished difference Result 46 states and 58 transitions. [2022-12-14 10:01:19,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 10:01:19,392 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 8 states have (on average 1.25) internal successors, (10), 7 states have internal predecessors, (10), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 24 [2022-12-14 10:01:19,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:19,393 INFO L225 Difference]: With dead ends: 46 [2022-12-14 10:01:19,393 INFO L226 Difference]: Without dead ends: 42 [2022-12-14 10:01:19,393 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 29 SyntacticMatches, 7 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=88, Invalid=418, Unknown=0, NotChecked=0, Total=506 [2022-12-14 10:01:19,394 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 1 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:19,395 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 82 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 10:01:19,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-12-14 10:01:19,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-12-14 10:01:19,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 24 states have internal predecessors, (26), 14 states have call successors, (14), 5 states have call predecessors, (14), 5 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-12-14 10:01:19,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 52 transitions. [2022-12-14 10:01:19,402 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 52 transitions. Word has length 24 [2022-12-14 10:01:19,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:19,402 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 52 transitions. [2022-12-14 10:01:19,402 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 8 states have (on average 1.25) internal successors, (10), 7 states have internal predecessors, (10), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-12-14 10:01:19,402 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 52 transitions. [2022-12-14 10:01:19,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-12-14 10:01:19,402 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:19,403 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:19,407 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-12-14 10:01:19,603 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:19,604 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:19,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:19,606 INFO L85 PathProgramCache]: Analyzing trace with hash -1385830456, now seen corresponding path program 1 times [2022-12-14 10:01:19,606 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:19,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821889064] [2022-12-14 10:01:19,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:19,607 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:19,617 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 10:01:19,617 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [173335441] [2022-12-14 10:01:19,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:19,617 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:19,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:19,618 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:19,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 10:01:19,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:19,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 10:01:19,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:19,674 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 10:01:19,674 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 10:01:19,674 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:19,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [821889064] [2022-12-14 10:01:19,675 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 10:01:19,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [173335441] [2022-12-14 10:01:19,675 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [173335441] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 10:01:19,675 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 10:01:19,675 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 10:01:19,675 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824932134] [2022-12-14 10:01:19,675 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 10:01:19,676 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 10:01:19,676 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:19,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 10:01:19,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 10:01:19,676 INFO L87 Difference]: Start difference. First operand 42 states and 52 transitions. Second operand has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2022-12-14 10:01:19,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:19,706 INFO L93 Difference]: Finished difference Result 52 states and 64 transitions. [2022-12-14 10:01:19,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 10:01:19,706 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 30 [2022-12-14 10:01:19,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:19,707 INFO L225 Difference]: With dead ends: 52 [2022-12-14 10:01:19,707 INFO L226 Difference]: Without dead ends: 50 [2022-12-14 10:01:19,707 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-12-14 10:01:19,708 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 5 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:19,708 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 100 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 10:01:19,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-12-14 10:01:19,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2022-12-14 10:01:19,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 25 states have (on average 1.16) internal successors, (29), 28 states have internal predecessors, (29), 15 states have call successors, (15), 6 states have call predecessors, (15), 6 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2022-12-14 10:01:19,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 57 transitions. [2022-12-14 10:01:19,715 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 57 transitions. Word has length 30 [2022-12-14 10:01:19,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:19,715 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 57 transitions. [2022-12-14 10:01:19,715 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2022-12-14 10:01:19,715 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 57 transitions. [2022-12-14 10:01:19,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-12-14 10:01:19,716 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:19,716 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:19,720 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 10:01:19,917 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:19,918 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:19,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:19,919 INFO L85 PathProgramCache]: Analyzing trace with hash -1128008437, now seen corresponding path program 1 times [2022-12-14 10:01:19,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:19,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934761847] [2022-12-14 10:01:19,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:19,921 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:19,929 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 10:01:19,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1221029989] [2022-12-14 10:01:19,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:19,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:19,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:19,930 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:19,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 10:01:19,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:19,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 5 conjunts are in the unsatisfiable core [2022-12-14 10:01:19,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:20,018 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 10:01:20,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:20,053 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 10:01:20,053 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:20,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934761847] [2022-12-14 10:01:20,053 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 10:01:20,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1221029989] [2022-12-14 10:01:20,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1221029989] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:01:20,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1876831896] [2022-12-14 10:01:20,056 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-12-14 10:01:20,056 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:01:20,057 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 10:01:20,057 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 10:01:20,057 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 10:01:21,942 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 10:01:21,945 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 10:01:21,964 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 10:01:22,696 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1260#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 10:01:22,696 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 10:01:22,696 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:01:22,696 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2022-12-14 10:01:22,696 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534517321] [2022-12-14 10:01:22,697 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:01:22,697 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 10:01:22,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:22,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 10:01:22,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=451, Unknown=0, NotChecked=0, Total=552 [2022-12-14 10:01:22,698 INFO L87 Difference]: Start difference. First operand 47 states and 57 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2022-12-14 10:01:22,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:22,787 INFO L93 Difference]: Finished difference Result 109 states and 132 transitions. [2022-12-14 10:01:22,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 10:01:22,788 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 32 [2022-12-14 10:01:22,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:22,790 INFO L225 Difference]: With dead ends: 109 [2022-12-14 10:01:22,790 INFO L226 Difference]: Without dead ends: 97 [2022-12-14 10:01:22,791 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 221 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=121, Invalid=581, Unknown=0, NotChecked=0, Total=702 [2022-12-14 10:01:22,791 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 51 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:22,792 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 167 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 10:01:22,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-12-14 10:01:22,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 91. [2022-12-14 10:01:22,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 50 states have (on average 1.16) internal successors, (58), 54 states have internal predecessors, (58), 29 states have call successors, (29), 12 states have call predecessors, (29), 11 states have return successors, (25), 24 states have call predecessors, (25), 25 states have call successors, (25) [2022-12-14 10:01:22,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 112 transitions. [2022-12-14 10:01:22,808 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 112 transitions. Word has length 32 [2022-12-14 10:01:22,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:22,808 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 112 transitions. [2022-12-14 10:01:22,808 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2022-12-14 10:01:22,808 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 112 transitions. [2022-12-14 10:01:22,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-12-14 10:01:22,809 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:22,809 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:22,813 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 10:01:23,010 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:23,011 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:23,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:23,012 INFO L85 PathProgramCache]: Analyzing trace with hash -1126340141, now seen corresponding path program 1 times [2022-12-14 10:01:23,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:23,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184230526] [2022-12-14 10:01:23,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:23,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:23,043 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 10:01:23,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2052238955] [2022-12-14 10:01:23,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:23,043 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:23,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:23,045 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:23,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 10:01:23,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:23,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 10:01:23,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:23,206 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 10:01:23,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:23,309 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-12-14 10:01:23,309 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:23,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [184230526] [2022-12-14 10:01:23,310 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 10:01:23,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2052238955] [2022-12-14 10:01:23,310 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2052238955] provided 1 perfect and 1 imperfect interpolant sequences [2022-12-14 10:01:23,310 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 10:01:23,310 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 10 [2022-12-14 10:01:23,310 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237795243] [2022-12-14 10:01:23,310 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 10:01:23,311 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 10:01:23,311 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:23,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 10:01:23,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-12-14 10:01:23,311 INFO L87 Difference]: Start difference. First operand 91 states and 112 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-12-14 10:01:23,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:23,364 INFO L93 Difference]: Finished difference Result 105 states and 125 transitions. [2022-12-14 10:01:23,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 10:01:23,364 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 32 [2022-12-14 10:01:23,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:23,366 INFO L225 Difference]: With dead ends: 105 [2022-12-14 10:01:23,366 INFO L226 Difference]: Without dead ends: 103 [2022-12-14 10:01:23,366 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2022-12-14 10:01:23,367 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 8 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:23,367 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 63 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 10:01:23,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-12-14 10:01:23,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2022-12-14 10:01:23,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 59 states have (on average 1.1355932203389831) internal successors, (67), 63 states have internal predecessors, (67), 29 states have call successors, (29), 15 states have call predecessors, (29), 14 states have return successors, (25), 24 states have call predecessors, (25), 25 states have call successors, (25) [2022-12-14 10:01:23,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 121 transitions. [2022-12-14 10:01:23,380 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 121 transitions. Word has length 32 [2022-12-14 10:01:23,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:23,381 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 121 transitions. [2022-12-14 10:01:23,381 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-12-14 10:01:23,381 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 121 transitions. [2022-12-14 10:01:23,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 10:01:23,382 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:23,382 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:23,387 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 10:01:23,583 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:23,583 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:23,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:23,583 INFO L85 PathProgramCache]: Analyzing trace with hash -2087905654, now seen corresponding path program 1 times [2022-12-14 10:01:23,583 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:23,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1418735282] [2022-12-14 10:01:23,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:23,584 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:23,590 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 10:01:23,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [784258573] [2022-12-14 10:01:23,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:23,590 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:23,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:23,591 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:23,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 10:01:23,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:23,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 10:01:23,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:23,682 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 10:01:23,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:23,769 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 10:01:23,769 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:23,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1418735282] [2022-12-14 10:01:23,770 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 10:01:23,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784258573] [2022-12-14 10:01:23,770 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [784258573] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:01:23,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [928891491] [2022-12-14 10:01:23,771 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-12-14 10:01:23,771 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:01:23,772 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 10:01:23,772 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 10:01:23,772 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 10:01:24,097 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-12-14 10:01:24,104 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 10:01:24,125 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 10:01:25,048 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [928891491] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 10:01:25,048 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:01:25,048 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [9, 8] total 23 [2022-12-14 10:01:25,048 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110837899] [2022-12-14 10:01:25,049 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 10:01:25,049 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 10:01:25,049 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:25,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 10:01:25,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2022-12-14 10:01:25,050 INFO L87 Difference]: Start difference. First operand 103 states and 121 transitions. Second operand has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-12-14 10:01:25,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:25,232 INFO L93 Difference]: Finished difference Result 105 states and 122 transitions. [2022-12-14 10:01:25,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 10:01:25,232 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 35 [2022-12-14 10:01:25,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:25,233 INFO L225 Difference]: With dead ends: 105 [2022-12-14 10:01:25,233 INFO L226 Difference]: Without dead ends: 95 [2022-12-14 10:01:25,233 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 70 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2022-12-14 10:01:25,234 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 0 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:25,234 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 85 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 10:01:25,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-12-14 10:01:25,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2022-12-14 10:01:25,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 54 states have (on average 1.1296296296296295) internal successors, (61), 58 states have internal predecessors, (61), 27 states have call successors, (27), 13 states have call predecessors, (27), 13 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2022-12-14 10:01:25,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 112 transitions. [2022-12-14 10:01:25,244 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 112 transitions. Word has length 35 [2022-12-14 10:01:25,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:25,244 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 112 transitions. [2022-12-14 10:01:25,245 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-12-14 10:01:25,245 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 112 transitions. [2022-12-14 10:01:25,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-12-14 10:01:25,245 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:25,245 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:25,250 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 10:01:25,446 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-12-14 10:01:25,446 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:25,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:25,447 INFO L85 PathProgramCache]: Analyzing trace with hash 1860492319, now seen corresponding path program 2 times [2022-12-14 10:01:25,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:25,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283223962] [2022-12-14 10:01:25,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:25,448 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:25,459 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 10:01:25,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [741021921] [2022-12-14 10:01:25,459 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:01:25,459 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:25,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:25,460 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:25,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 10:01:25,495 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 10:01:25,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:01:25,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 10:01:25,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:25,773 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-12-14 10:01:25,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:26,015 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-12-14 10:01:26,015 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:26,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283223962] [2022-12-14 10:01:26,015 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 10:01:26,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [741021921] [2022-12-14 10:01:26,015 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [741021921] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:01:26,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2102016925] [2022-12-14 10:01:26,017 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 10:01:26,017 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:01:26,017 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 10:01:26,017 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 10:01:26,017 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 10:01:27,488 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 10:01:27,492 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 10:01:27,511 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 10:01:29,433 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2833#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 10:01:29,433 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 10:01:29,433 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:01:29,434 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 13 [2022-12-14 10:01:29,434 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184412094] [2022-12-14 10:01:29,434 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:01:29,434 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 10:01:29,434 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:29,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 10:01:29,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=658, Unknown=0, NotChecked=0, Total=756 [2022-12-14 10:01:29,435 INFO L87 Difference]: Start difference. First operand 95 states and 112 transitions. Second operand has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 6 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 7 states have call predecessors, (12), 6 states have call successors, (12) [2022-12-14 10:01:32,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:32,232 INFO L93 Difference]: Finished difference Result 108 states and 126 transitions. [2022-12-14 10:01:32,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 10:01:32,233 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 6 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 7 states have call predecessors, (12), 6 states have call successors, (12) Word has length 37 [2022-12-14 10:01:32,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:32,234 INFO L225 Difference]: With dead ends: 108 [2022-12-14 10:01:32,234 INFO L226 Difference]: Without dead ends: 106 [2022-12-14 10:01:32,235 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=136, Invalid=920, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 10:01:32,235 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 32 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:32,235 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 174 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-12-14 10:01:32,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-12-14 10:01:32,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 103. [2022-12-14 10:01:32,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 64 states have internal predecessors, (67), 27 states have call successors, (27), 15 states have call predecessors, (27), 15 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2022-12-14 10:01:32,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 118 transitions. [2022-12-14 10:01:32,256 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 118 transitions. Word has length 37 [2022-12-14 10:01:32,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:32,257 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 118 transitions. [2022-12-14 10:01:32,257 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 6 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 7 states have call predecessors, (12), 6 states have call successors, (12) [2022-12-14 10:01:32,257 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 118 transitions. [2022-12-14 10:01:32,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-12-14 10:01:32,257 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:32,257 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:32,262 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 10:01:32,458 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 10:01:32,459 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:32,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:32,460 INFO L85 PathProgramCache]: Analyzing trace with hash -209579757, now seen corresponding path program 3 times [2022-12-14 10:01:32,461 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:32,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559058943] [2022-12-14 10:01:32,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:32,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:32,487 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 10:01:32,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1436719157] [2022-12-14 10:01:32,488 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:01:32,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:32,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:32,491 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:32,493 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 10:01:32,539 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:01:32,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:01:32,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 39 conjunts are in the unsatisfiable core [2022-12-14 10:01:32,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:32,875 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 16 proven. 18 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-12-14 10:01:32,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:33,330 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 20 proven. 13 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-12-14 10:01:33,330 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:33,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559058943] [2022-12-14 10:01:33,330 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 10:01:33,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1436719157] [2022-12-14 10:01:33,330 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1436719157] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:01:33,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1072560645] [2022-12-14 10:01:33,331 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 10:01:33,331 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:01:33,332 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 10:01:33,332 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 10:01:33,332 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 10:01:34,717 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 10:01:34,721 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 10:01:34,738 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 10:01:36,452 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3429#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 10:01:36,453 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 10:01:36,453 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:01:36,453 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 17 [2022-12-14 10:01:36,453 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731073450] [2022-12-14 10:01:36,453 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:01:36,454 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 10:01:36,454 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:36,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 10:01:36,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=870, Unknown=0, NotChecked=0, Total=992 [2022-12-14 10:01:36,455 INFO L87 Difference]: Start difference. First operand 103 states and 118 transitions. Second operand has 17 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 11 states have internal predecessors, (28), 8 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 7 states have call predecessors, (14), 8 states have call successors, (14) [2022-12-14 10:01:37,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:37,462 INFO L93 Difference]: Finished difference Result 120 states and 136 transitions. [2022-12-14 10:01:37,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 10:01:37,462 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 11 states have internal predecessors, (28), 8 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 7 states have call predecessors, (14), 8 states have call successors, (14) Word has length 42 [2022-12-14 10:01:37,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:37,463 INFO L225 Difference]: With dead ends: 120 [2022-12-14 10:01:37,463 INFO L226 Difference]: Without dead ends: 106 [2022-12-14 10:01:37,464 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 95 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 377 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=176, Invalid=1230, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 10:01:37,465 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 37 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 341 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 411 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 341 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:37,465 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 79 Invalid, 411 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 341 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 10:01:37,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-12-14 10:01:37,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 97. [2022-12-14 10:01:37,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 62 states have (on average 1.0806451612903225) internal successors, (67), 64 states have internal predecessors, (67), 19 states have call successors, (19), 16 states have call predecessors, (19), 15 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2022-12-14 10:01:37,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 103 transitions. [2022-12-14 10:01:37,478 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 103 transitions. Word has length 42 [2022-12-14 10:01:37,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:37,478 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 103 transitions. [2022-12-14 10:01:37,478 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 11 states have internal predecessors, (28), 8 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 7 states have call predecessors, (14), 8 states have call successors, (14) [2022-12-14 10:01:37,479 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 103 transitions. [2022-12-14 10:01:37,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-12-14 10:01:37,479 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:37,479 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:37,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-12-14 10:01:37,680 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:37,681 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:37,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:37,683 INFO L85 PathProgramCache]: Analyzing trace with hash 484799234, now seen corresponding path program 1 times [2022-12-14 10:01:37,683 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:37,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016559900] [2022-12-14 10:01:37,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:37,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:37,694 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 10:01:37,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1480722720] [2022-12-14 10:01:37,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:37,694 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:37,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:37,695 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:37,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 10:01:37,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:37,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 10:01:37,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:37,802 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 41 proven. 5 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-12-14 10:01:37,802 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:37,873 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 41 proven. 5 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-12-14 10:01:37,874 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:37,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016559900] [2022-12-14 10:01:37,874 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 10:01:37,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1480722720] [2022-12-14 10:01:37,874 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1480722720] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:01:37,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1626663468] [2022-12-14 10:01:37,876 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-12-14 10:01:37,876 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:01:37,876 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 10:01:37,876 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 10:01:37,876 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 10:01:39,447 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 10:01:39,450 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 10:01:39,469 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 10:01:51,830 WARN L233 SmtUtils]: Spent 7.93s on a formula simplification. DAG size of input: 61 DAG size of output: 53 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 10:01:54,556 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4093#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 10:01:54,556 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 10:01:54,556 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:01:54,556 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2022-12-14 10:01:54,556 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601626997] [2022-12-14 10:01:54,557 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:01:54,557 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-12-14 10:01:54,557 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:54,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-12-14 10:01:54,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=644, Unknown=1, NotChecked=0, Total=756 [2022-12-14 10:01:54,558 INFO L87 Difference]: Start difference. First operand 97 states and 103 transitions. Second operand has 12 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 4 states have call successors, (9) [2022-12-14 10:01:54,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:54,696 INFO L93 Difference]: Finished difference Result 104 states and 109 transitions. [2022-12-14 10:01:54,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 10:01:54,696 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 4 states have call successors, (9) Word has length 53 [2022-12-14 10:01:54,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:54,697 INFO L225 Difference]: With dead ends: 104 [2022-12-14 10:01:54,697 INFO L226 Difference]: Without dead ends: 84 [2022-12-14 10:01:54,697 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 130 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 15.2s TimeCoverageRelationStatistics Valid=127, Invalid=742, Unknown=1, NotChecked=0, Total=870 [2022-12-14 10:01:54,698 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 15 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:54,698 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 72 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 10:01:54,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-12-14 10:01:54,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2022-12-14 10:01:54,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 54 states have (on average 1.037037037037037) internal successors, (56), 55 states have internal predecessors, (56), 16 states have call successors, (16), 13 states have call predecessors, (16), 13 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-12-14 10:01:54,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 87 transitions. [2022-12-14 10:01:54,707 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 87 transitions. Word has length 53 [2022-12-14 10:01:54,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:54,707 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 87 transitions. [2022-12-14 10:01:54,707 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 4 states have call successors, (9) [2022-12-14 10:01:54,707 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 87 transitions. [2022-12-14 10:01:54,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-12-14 10:01:54,708 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:54,708 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:54,713 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-12-14 10:01:54,909 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:54,910 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:54,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:54,911 INFO L85 PathProgramCache]: Analyzing trace with hash 1893559055, now seen corresponding path program 4 times [2022-12-14 10:01:54,912 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:54,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [773570427] [2022-12-14 10:01:54,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:54,913 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:54,921 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 10:01:54,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1387949761] [2022-12-14 10:01:54,921 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:01:54,921 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:54,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:54,922 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:54,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 10:01:55,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:55,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 41 conjunts are in the unsatisfiable core [2022-12-14 10:01:55,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:56,861 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 66 proven. 48 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2022-12-14 10:01:56,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:57,187 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 76 proven. 8 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2022-12-14 10:01:57,188 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:57,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [773570427] [2022-12-14 10:01:57,188 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 10:01:57,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1387949761] [2022-12-14 10:01:57,188 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1387949761] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:01:57,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2146473280] [2022-12-14 10:01:57,189 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 10:01:57,189 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:01:57,189 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 10:01:57,189 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 10:01:57,189 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 10:01:58,637 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 10:01:58,641 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 10:01:58,658 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 10:02:00,631 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4826#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 10:02:00,631 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 10:02:00,631 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:02:00,631 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 17 [2022-12-14 10:02:00,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085937863] [2022-12-14 10:02:00,631 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:02:00,631 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 10:02:00,631 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:02:00,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 10:02:00,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=868, Unknown=0, NotChecked=0, Total=992 [2022-12-14 10:02:00,632 INFO L87 Difference]: Start difference. First operand 84 states and 87 transitions. Second operand has 17 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 13 states have internal predecessors, (35), 7 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (19), 9 states have call predecessors, (19), 7 states have call successors, (19) [2022-12-14 10:02:03,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:02:03,036 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2022-12-14 10:02:03,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 10:02:03,036 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 13 states have internal predecessors, (35), 7 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (19), 9 states have call predecessors, (19), 7 states have call successors, (19) Word has length 73 [2022-12-14 10:02:03,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:02:03,037 INFO L225 Difference]: With dead ends: 94 [2022-12-14 10:02:03,037 INFO L226 Difference]: Without dead ends: 92 [2022-12-14 10:02:03,037 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 186 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 341 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=168, Invalid=1164, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 10:02:03,038 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 22 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 405 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 10:02:03,038 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 134 Invalid, 405 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 10:02:03,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-12-14 10:02:03,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 88. [2022-12-14 10:02:03,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 58 states have internal predecessors, (59), 16 states have call successors, (16), 14 states have call predecessors, (16), 14 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-12-14 10:02:03,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2022-12-14 10:02:03,059 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 73 [2022-12-14 10:02:03,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:02:03,060 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2022-12-14 10:02:03,060 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 13 states have internal predecessors, (35), 7 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (19), 9 states have call predecessors, (19), 7 states have call successors, (19) [2022-12-14 10:02:03,060 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2022-12-14 10:02:03,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-12-14 10:02:03,061 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:02:03,061 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:02:03,066 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 10:02:03,262 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-12-14 10:02:03,263 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:02:03,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:02:03,264 INFO L85 PathProgramCache]: Analyzing trace with hash -510598493, now seen corresponding path program 2 times [2022-12-14 10:02:03,264 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:02:03,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1701307764] [2022-12-14 10:02:03,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:02:03,265 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:02:03,288 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 10:02:03,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [533480170] [2022-12-14 10:02:03,288 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:02:03,288 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:02:03,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:02:03,289 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:02:03,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 10:02:03,809 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 10:02:03,809 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:02:03,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 11 conjunts are in the unsatisfiable core [2022-12-14 10:02:03,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:02:03,882 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 24 proven. 260 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-12-14 10:02:03,882 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:02:03,954 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 24 proven. 44 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2022-12-14 10:02:03,954 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:02:03,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1701307764] [2022-12-14 10:02:03,954 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 10:02:03,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [533480170] [2022-12-14 10:02:03,955 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [533480170] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:02:03,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [480228027] [2022-12-14 10:02:03,956 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-12-14 10:02:03,956 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:02:03,957 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 10:02:03,957 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 10:02:03,957 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 10:02:05,441 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 10:02:05,444 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 10:02:05,463 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 10:02:07,065 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5632#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 10:02:07,065 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 10:02:07,065 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:02:07,065 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-12-14 10:02:07,065 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714374260] [2022-12-14 10:02:07,065 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:02:07,066 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 10:02:07,066 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:02:07,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 10:02:07,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=688, Unknown=0, NotChecked=0, Total=870 [2022-12-14 10:02:07,067 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (29), 7 states have call predecessors, (29), 6 states have return successors, (28), 10 states have call predecessors, (28), 10 states have call successors, (28) [2022-12-14 10:02:07,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:02:07,260 INFO L93 Difference]: Finished difference Result 204 states and 212 transitions. [2022-12-14 10:02:07,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 10:02:07,260 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (29), 7 states have call predecessors, (29), 6 states have return successors, (28), 10 states have call predecessors, (28), 10 states have call successors, (28) Word has length 86 [2022-12-14 10:02:07,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:02:07,261 INFO L225 Difference]: With dead ends: 204 [2022-12-14 10:02:07,261 INFO L226 Difference]: Without dead ends: 196 [2022-12-14 10:02:07,262 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 228 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=295, Invalid=1187, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 10:02:07,262 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 50 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 10:02:07,263 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 135 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 10:02:07,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-12-14 10:02:07,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2022-12-14 10:02:07,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 129 states have (on average 1.0155038759689923) internal successors, (131), 130 states have internal predecessors, (131), 34 states have call successors, (34), 32 states have call predecessors, (34), 32 states have return successors, (33), 33 states have call predecessors, (33), 33 states have call successors, (33) [2022-12-14 10:02:07,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 198 transitions. [2022-12-14 10:02:07,293 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 198 transitions. Word has length 86 [2022-12-14 10:02:07,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:02:07,293 INFO L495 AbstractCegarLoop]: Abstraction has 196 states and 198 transitions. [2022-12-14 10:02:07,293 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (29), 7 states have call predecessors, (29), 6 states have return successors, (28), 10 states have call predecessors, (28), 10 states have call successors, (28) [2022-12-14 10:02:07,293 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 198 transitions. [2022-12-14 10:02:07,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2022-12-14 10:02:07,295 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:02:07,295 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 30, 11, 10, 10, 10, 10, 10, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:02:07,301 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 10:02:07,496 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-12-14 10:02:07,497 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:02:07,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:02:07,498 INFO L85 PathProgramCache]: Analyzing trace with hash 1184159699, now seen corresponding path program 3 times [2022-12-14 10:02:07,499 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:02:07,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [243786848] [2022-12-14 10:02:07,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:02:07,499 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:02:07,532 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 10:02:07,532 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2056466606] [2022-12-14 10:02:07,532 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:02:07,533 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:02:07,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:02:07,534 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:02:07,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 10:02:07,688 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:02:07,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:02:07,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 23 conjunts are in the unsatisfiable core [2022-12-14 10:02:07,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:02:07,875 INFO L134 CoverageAnalysis]: Checked inductivity of 2092 backedges. 60 proven. 1910 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2022-12-14 10:02:07,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:02:08,079 INFO L134 CoverageAnalysis]: Checked inductivity of 2092 backedges. 60 proven. 290 refuted. 0 times theorem prover too weak. 1742 trivial. 0 not checked. [2022-12-14 10:02:08,079 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:02:08,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [243786848] [2022-12-14 10:02:08,079 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 10:02:08,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2056466606] [2022-12-14 10:02:08,079 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2056466606] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:02:08,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [383886302] [2022-12-14 10:02:08,081 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-12-14 10:02:08,081 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:02:08,081 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 10:02:08,081 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 10:02:08,081 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 10:02:09,400 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 10:02:09,403 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 10:02:09,422 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 10:02:10,974 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7407#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 10:02:10,974 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 10:02:10,974 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:02:10,974 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2022-12-14 10:02:10,975 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973542709] [2022-12-14 10:02:10,975 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:02:10,975 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 10:02:10,975 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:02:10,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 10:02:10,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=452, Invalid=1270, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 10:02:10,978 INFO L87 Difference]: Start difference. First operand 196 states and 198 transitions. Second operand has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (65), 13 states have call predecessors, (65), 12 states have return successors, (64), 22 states have call predecessors, (64), 22 states have call successors, (64) [2022-12-14 10:02:11,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:02:11,458 INFO L93 Difference]: Finished difference Result 420 states and 434 transitions. [2022-12-14 10:02:11,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-12-14 10:02:11,458 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (65), 13 states have call predecessors, (65), 12 states have return successors, (64), 22 states have call predecessors, (64), 22 states have call successors, (64) Word has length 194 [2022-12-14 10:02:11,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:02:11,460 INFO L225 Difference]: With dead ends: 420 [2022-12-14 10:02:11,460 INFO L226 Difference]: Without dead ends: 412 [2022-12-14 10:02:11,460 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 540 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1211 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=967, Invalid=2939, Unknown=0, NotChecked=0, Total=3906 [2022-12-14 10:02:11,461 INFO L413 NwaCegarLoop]: 83 mSDtfsCounter, 113 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 294 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 10:02:11,461 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [113 Valid, 270 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 294 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 10:02:11,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 412 states. [2022-12-14 10:02:11,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 412 to 412. [2022-12-14 10:02:11,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 412 states, 273 states have (on average 1.0073260073260073) internal successors, (275), 274 states have internal predecessors, (275), 70 states have call successors, (70), 68 states have call predecessors, (70), 68 states have return successors, (69), 69 states have call predecessors, (69), 69 states have call successors, (69) [2022-12-14 10:02:11,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 414 transitions. [2022-12-14 10:02:11,521 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 414 transitions. Word has length 194 [2022-12-14 10:02:11,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:02:11,521 INFO L495 AbstractCegarLoop]: Abstraction has 412 states and 414 transitions. [2022-12-14 10:02:11,521 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (65), 13 states have call predecessors, (65), 12 states have return successors, (64), 22 states have call predecessors, (64), 22 states have call successors, (64) [2022-12-14 10:02:11,521 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 414 transitions. [2022-12-14 10:02:11,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 411 [2022-12-14 10:02:11,526 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:02:11,526 INFO L195 NwaCegarLoop]: trace histogram [67, 66, 66, 23, 22, 22, 22, 22, 22, 22, 22, 22, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:02:11,531 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-12-14 10:02:11,726 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:02:11,727 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:02:11,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:02:11,729 INFO L85 PathProgramCache]: Analyzing trace with hash 115288627, now seen corresponding path program 4 times [2022-12-14 10:02:11,729 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:02:11,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1334704340] [2022-12-14 10:02:11,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:02:11,730 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:02:11,777 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 10:02:11,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [865698453] [2022-12-14 10:02:11,778 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:02:11,778 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:02:11,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:02:11,779 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:02:11,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 10:02:11,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:02:11,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 821 conjuncts, 47 conjunts are in the unsatisfiable core [2022-12-14 10:02:11,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:02:12,289 INFO L134 CoverageAnalysis]: Checked inductivity of 10144 backedges. 132 proven. 9746 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2022-12-14 10:02:12,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:02:12,930 INFO L134 CoverageAnalysis]: Checked inductivity of 10144 backedges. 132 proven. 1430 refuted. 0 times theorem prover too weak. 8582 trivial. 0 not checked. [2022-12-14 10:02:12,930 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:02:12,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1334704340] [2022-12-14 10:02:12,931 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 10:02:12,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [865698453] [2022-12-14 10:02:12,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [865698453] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:02:12,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1104552560] [2022-12-14 10:02:12,933 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-12-14 10:02:12,933 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:02:12,933 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 10:02:12,933 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 10:02:12,933 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 10:02:14,474 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 10:02:14,478 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 10:02:14,508 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 10:02:16,287 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11126#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 10:02:16,287 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 10:02:16,288 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:02:16,288 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26] total 50 [2022-12-14 10:02:16,288 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699584270] [2022-12-14 10:02:16,288 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:02:16,289 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-12-14 10:02:16,289 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:02:16,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-12-14 10:02:16,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1424, Invalid=2866, Unknown=0, NotChecked=0, Total=4290 [2022-12-14 10:02:16,292 INFO L87 Difference]: Start difference. First operand 412 states and 414 transitions. Second operand has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (137), 25 states have call predecessors, (137), 24 states have return successors, (136), 46 states have call predecessors, (136), 46 states have call successors, (136) [2022-12-14 10:02:17,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:02:17,849 INFO L93 Difference]: Finished difference Result 852 states and 878 transitions. [2022-12-14 10:02:17,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-12-14 10:02:17,850 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (137), 25 states have call predecessors, (137), 24 states have return successors, (136), 46 states have call predecessors, (136), 46 states have call successors, (136) Word has length 410 [2022-12-14 10:02:17,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:02:17,855 INFO L225 Difference]: With dead ends: 852 [2022-12-14 10:02:17,855 INFO L226 Difference]: Without dead ends: 844 [2022-12-14 10:02:17,857 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1273 GetRequests, 1164 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3161 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3607, Invalid=8603, Unknown=0, NotChecked=0, Total=12210 [2022-12-14 10:02:17,857 INFO L413 NwaCegarLoop]: 155 mSDtfsCounter, 248 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 891 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 522 SdHoareTripleChecker+Invalid, 997 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 891 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 10:02:17,857 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [248 Valid, 522 Invalid, 997 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 891 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 10:02:17,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 844 states. [2022-12-14 10:02:17,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 844 to 844. [2022-12-14 10:02:17,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 844 states, 561 states have (on average 1.0035650623885919) internal successors, (563), 562 states have internal predecessors, (563), 142 states have call successors, (142), 140 states have call predecessors, (142), 140 states have return successors, (141), 141 states have call predecessors, (141), 141 states have call successors, (141) [2022-12-14 10:02:17,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 844 states to 844 states and 846 transitions. [2022-12-14 10:02:17,986 INFO L78 Accepts]: Start accepts. Automaton has 844 states and 846 transitions. Word has length 410 [2022-12-14 10:02:17,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:02:17,986 INFO L495 AbstractCegarLoop]: Abstraction has 844 states and 846 transitions. [2022-12-14 10:02:17,987 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (137), 25 states have call predecessors, (137), 24 states have return successors, (136), 46 states have call predecessors, (136), 46 states have call successors, (136) [2022-12-14 10:02:17,987 INFO L276 IsEmpty]: Start isEmpty. Operand 844 states and 846 transitions. [2022-12-14 10:02:18,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 843 [2022-12-14 10:02:18,004 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:02:18,004 INFO L195 NwaCegarLoop]: trace histogram [139, 138, 138, 47, 46, 46, 46, 46, 46, 46, 46, 46, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:02:18,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-12-14 10:02:18,204 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 10:02:18,206 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:02:18,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:02:18,207 INFO L85 PathProgramCache]: Analyzing trace with hash -1269993741, now seen corresponding path program 5 times [2022-12-14 10:02:18,207 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:02:18,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934451613] [2022-12-14 10:02:18,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:02:18,208 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:02:18,266 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 10:02:18,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1823549330] [2022-12-14 10:02:18,267 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:02:18,267 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:02:18,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:02:18,267 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:02:18,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_922d8144-2625-4f04-927c-a467196f2f29/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process