./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound100.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b 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_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound100.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS --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 ac7d6bbeae1af74610eb5ea0ec9cc56676532539c7535ebfdf72e0c17174815d --- 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-8393723 [2022-11-19 06:36:54,298 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 06:36:54,318 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 06:36:54,349 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 06:36:54,353 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 06:36:54,357 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 06:36:54,360 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 06:36:54,365 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 06:36:54,369 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 06:36:54,377 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 06:36:54,379 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 06:36:54,382 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 06:36:54,382 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 06:36:54,386 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 06:36:54,388 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 06:36:54,392 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 06:36:54,393 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 06:36:54,395 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 06:36:54,396 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 06:36:54,403 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 06:36:54,407 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 06:36:54,408 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 06:36:54,412 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 06:36:54,413 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 06:36:54,419 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 06:36:54,420 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 06:36:54,420 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 06:36:54,421 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 06:36:54,422 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 06:36:54,423 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 06:36:54,423 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 06:36:54,424 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 06:36:54,425 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 06:36:54,426 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 06:36:54,427 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 06:36:54,427 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 06:36:54,428 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 06:36:54,428 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 06:36:54,428 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 06:36:54,428 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 06:36:54,429 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 06:36:54,430 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 06:36:54,481 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 06:36:54,482 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 06:36:54,482 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 06:36:54,483 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 06:36:54,484 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 06:36:54,485 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 06:36:54,485 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 06:36:54,485 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 06:36:54,486 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 06:36:54,486 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 06:36:54,487 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 06:36:54,488 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 06:36:54,488 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 06:36:54,488 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 06:36:54,488 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 06:36:54,489 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 06:36:54,489 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 06:36:54,489 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 06:36:54,490 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 06:36:54,491 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 06:36:54,491 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 06:36:54,491 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 06:36:54,491 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 06:36:54,493 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 06:36:54,494 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 06:36:54,494 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 06:36:54,494 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 06:36:54,494 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 06:36:54,495 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 06:36:54,495 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 06:36:54,495 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 06:36:54,496 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 06:36:54,496 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 06:36:54,497 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 06:36:54,497 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 06:36:54,497 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 06:36:54,497 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 06:36:54,498 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 06:36:54,498 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 06:36:54,498 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 06:36:54,499 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 06:36:54,499 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_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ac7d6bbeae1af74610eb5ea0ec9cc56676532539c7535ebfdf72e0c17174815d [2022-11-19 06:36:54,760 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 06:36:54,785 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 06:36:54,788 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 06:36:54,789 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 06:36:54,790 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 06:36:54,792 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound100.c [2022-11-19 06:36:54,863 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/data/abfb41c7f/8b2bc5b69be4480d94abdc66bd3876de/FLAG790241172 [2022-11-19 06:36:55,325 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 06:36:55,326 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound100.c [2022-11-19 06:36:55,340 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/data/abfb41c7f/8b2bc5b69be4480d94abdc66bd3876de/FLAG790241172 [2022-11-19 06:36:55,712 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/data/abfb41c7f/8b2bc5b69be4480d94abdc66bd3876de [2022-11-19 06:36:55,715 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 06:36:55,717 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 06:36:55,718 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 06:36:55,718 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 06:36:55,723 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 06:36:55,724 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 06:36:55" (1/1) ... [2022-11-19 06:36:55,725 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27fa7656 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:36:55, skipping insertion in model container [2022-11-19 06:36:55,725 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 06:36:55" (1/1) ... [2022-11-19 06:36:55,734 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 06:36:55,750 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 06:36:55,922 WARN L234 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_175dacce-f883-4faf-a03b-9c6d2e741585/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound100.c[535,548] [2022-11-19 06:36:55,963 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 06:36:55,972 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 06:36:55,985 WARN L234 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_175dacce-f883-4faf-a03b-9c6d2e741585/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound100.c[535,548] [2022-11-19 06:36:55,994 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 06:36:56,007 INFO L208 MainTranslator]: Completed translation [2022-11-19 06:36:56,008 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:36:56 WrapperNode [2022-11-19 06:36:56,008 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 06:36:56,009 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 06:36:56,009 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 06:36:56,010 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 06:36:56,018 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:36:56" (1/1) ... [2022-11-19 06:36:56,025 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:36:56" (1/1) ... [2022-11-19 06:36:56,045 INFO L138 Inliner]: procedures = 14, calls = 13, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 67 [2022-11-19 06:36:56,045 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 06:36:56,046 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 06:36:56,046 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 06:36:56,046 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 06:36:56,056 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:36:56" (1/1) ... [2022-11-19 06:36:56,056 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:36:56" (1/1) ... [2022-11-19 06:36:56,058 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:36:56" (1/1) ... [2022-11-19 06:36:56,058 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:36:56" (1/1) ... [2022-11-19 06:36:56,062 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:36:56" (1/1) ... [2022-11-19 06:36:56,067 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:36:56" (1/1) ... [2022-11-19 06:36:56,068 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:36:56" (1/1) ... [2022-11-19 06:36:56,069 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:36:56" (1/1) ... [2022-11-19 06:36:56,071 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 06:36:56,072 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 06:36:56,072 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 06:36:56,072 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 06:36:56,073 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:36:56" (1/1) ... [2022-11-19 06:36:56,081 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 06:36:56,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:36:56,105 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 06:36:56,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 06:36:56,150 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 06:36:56,151 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-19 06:36:56,151 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-19 06:36:56,151 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 06:36:56,151 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 06:36:56,152 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 06:36:56,152 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-19 06:36:56,152 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-19 06:36:56,224 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 06:36:56,227 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 06:36:56,535 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 06:36:56,566 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 06:36:56,566 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-19 06:36:56,569 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 06:36:56 BoogieIcfgContainer [2022-11-19 06:36:56,570 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 06:36:56,572 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 06:36:56,572 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 06:36:56,576 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 06:36:56,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 06:36:55" (1/3) ... [2022-11-19 06:36:56,578 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e77caaa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 06:36:56, skipping insertion in model container [2022-11-19 06:36:56,578 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:36:56" (2/3) ... [2022-11-19 06:36:56,578 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e77caaa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 06:36:56, skipping insertion in model container [2022-11-19 06:36:56,579 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 06:36:56" (3/3) ... [2022-11-19 06:36:56,580 INFO L112 eAbstractionObserver]: Analyzing ICFG fermat1-ll_unwindbound100.c [2022-11-19 06:36:56,603 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 06:36:56,603 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-19 06:36:56,663 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 06:36:56,672 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;@41105356, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 06:36:56,672 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-19 06:36:56,679 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-19 06:36:56,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-19 06:36:56,688 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:36:56,689 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:36:56,693 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:36:56,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:36:56,703 INFO L85 PathProgramCache]: Analyzing trace with hash -438729207, now seen corresponding path program 1 times [2022-11-19 06:36:56,714 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:36:56,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [182703361] [2022-11-19 06:36:56,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:36:56,717 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:36:56,854 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:36:56,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [261352382] [2022-11-19 06:36:56,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:36:56,859 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:36:56,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:36:56,867 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:36:56,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 06:36:56,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:36:56,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-19 06:36:56,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:36:56,975 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:36:57,001 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:36:57,002 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:36:57,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [182703361] [2022-11-19 06:36:57,002 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:36:57,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [261352382] [2022-11-19 06:36:57,003 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [261352382] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:36:57,004 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:36:57,004 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-19 06:36:57,007 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542827752] [2022-11-19 06:36:57,008 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:36:57,013 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-19 06:36:57,013 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:36:57,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-19 06:36:57,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-19 06:36:57,078 INFO L87 Difference]: Start difference. First operand has 27 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) 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) [2022-11-19 06:36:57,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:36:57,143 INFO L93 Difference]: Finished difference Result 48 states and 77 transitions. [2022-11-19 06:36:57,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-19 06:36:57,147 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 [2022-11-19 06:36:57,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:36:57,199 INFO L225 Difference]: With dead ends: 48 [2022-11-19 06:36:57,199 INFO L226 Difference]: Without dead ends: 25 [2022-11-19 06:36:57,204 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-19 06:36:57,209 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:36:57,223 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 33 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:36:57,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-19 06:36:57,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-11-19 06:36:57,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.4375) internal successors, (23), 17 states have internal predecessors, (23), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-19 06:36:57,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 34 transitions. [2022-11-19 06:36:57,323 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 34 transitions. Word has length 13 [2022-11-19 06:36:57,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:36:57,326 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 34 transitions. [2022-11-19 06:36:57,326 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) [2022-11-19 06:36:57,327 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 34 transitions. [2022-11-19 06:36:57,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-19 06:36:57,332 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:36:57,332 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:36:57,348 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-19 06:36:57,538 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:36:57,539 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:36:57,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:36:57,540 INFO L85 PathProgramCache]: Analyzing trace with hash 2071776720, now seen corresponding path program 1 times [2022-11-19 06:36:57,540 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:36:57,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055306610] [2022-11-19 06:36:57,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:36:57,541 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:36:57,563 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:36:57,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [228432418] [2022-11-19 06:36:57,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:36:57,569 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:36:57,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:36:57,572 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:36:57,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 06:36:57,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:36:57,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-19 06:36:57,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:36:57,747 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:36:57,748 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:36:57,748 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:36:57,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055306610] [2022-11-19 06:36:57,749 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:36:57,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [228432418] [2022-11-19 06:36:57,750 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [228432418] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:36:57,750 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:36:57,750 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 06:36:57,750 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835054382] [2022-11-19 06:36:57,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:36:57,752 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 06:36:57,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:36:57,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 06:36:57,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 06:36:57,754 INFO L87 Difference]: Start difference. First operand 25 states and 34 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) [2022-11-19 06:36:57,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:36:57,784 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2022-11-19 06:36:57,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 06:36:57,785 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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 [2022-11-19 06:36:57,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:36:57,787 INFO L225 Difference]: With dead ends: 34 [2022-11-19 06:36:57,787 INFO L226 Difference]: Without dead ends: 27 [2022-11-19 06:36:57,787 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 06:36:57,789 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 0 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:36:57,790 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 82 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:36:57,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-19 06:36:57,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-11-19 06:36:57,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-19 06:36:57,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 36 transitions. [2022-11-19 06:36:57,798 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 36 transitions. Word has length 14 [2022-11-19 06:36:57,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:36:57,801 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 36 transitions. [2022-11-19 06:36:57,801 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) [2022-11-19 06:36:57,801 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 36 transitions. [2022-11-19 06:36:57,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-19 06:36:57,803 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:36:57,804 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:36:57,815 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 06:36:58,004 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:36:58,005 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:36:58,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:36:58,006 INFO L85 PathProgramCache]: Analyzing trace with hash 2073445016, now seen corresponding path program 1 times [2022-11-19 06:36:58,006 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:36:58,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583961670] [2022-11-19 06:36:58,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:36:58,007 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:36:58,025 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:36:58,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [872148743] [2022-11-19 06:36:58,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:36:58,027 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:36:58,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:36:58,029 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:36:58,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 06:36:58,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:36:58,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-19 06:36:58,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:36:58,293 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:36:58,293 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:36:58,293 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:36:58,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [583961670] [2022-11-19 06:36:58,294 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:36:58,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872148743] [2022-11-19 06:36:58,294 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872148743] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:36:58,294 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:36:58,294 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-19 06:36:58,295 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336389778] [2022-11-19 06:36:58,295 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:36:58,295 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 06:36:58,295 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:36:58,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 06:36:58,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-19 06:36:58,296 INFO L87 Difference]: Start difference. First operand 27 states and 36 transitions. Second operand has 5 states, 5 states have (on average 1.6) 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) [2022-11-19 06:37:02,489 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 06:37:03,891 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.19s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 06:37:05,636 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 06:37:05,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:37:05,671 INFO L93 Difference]: Finished difference Result 46 states and 63 transitions. [2022-11-19 06:37:05,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 06:37:05,672 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) 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 [2022-11-19 06:37:05,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:37:05,674 INFO L225 Difference]: With dead ends: 46 [2022-11-19 06:37:05,674 INFO L226 Difference]: Without dead ends: 44 [2022-11-19 06:37:05,674 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:37:05,675 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 16 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.3s IncrementalHoareTripleChecker+Time [2022-11-19 06:37:05,676 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 81 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 63 Invalid, 1 Unknown, 0 Unchecked, 7.3s Time] [2022-11-19 06:37:05,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-19 06:37:05,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-11-19 06:37:05,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 31 states have internal predecessors, (43), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-19 06:37:05,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 60 transitions. [2022-11-19 06:37:05,695 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 60 transitions. Word has length 14 [2022-11-19 06:37:05,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:37:05,696 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 60 transitions. [2022-11-19 06:37:05,696 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) 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) [2022-11-19 06:37:05,697 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 60 transitions. [2022-11-19 06:37:05,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-19 06:37:05,698 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:37:05,698 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:37:05,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-19 06:37:05,904 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:37:05,904 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:37:05,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:37:05,905 INFO L85 PathProgramCache]: Analyzing trace with hash 1668710205, now seen corresponding path program 1 times [2022-11-19 06:37:05,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:37:05,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080625059] [2022-11-19 06:37:05,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:37:05,906 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:37:05,919 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:37:05,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1316438966] [2022-11-19 06:37:05,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:37:05,920 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:37:05,920 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:37:05,921 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:37:05,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 06:37:05,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:37:05,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-19 06:37:05,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:37:06,090 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:37:06,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:37:06,314 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:37:06,314 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:37:06,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080625059] [2022-11-19 06:37:06,315 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:37:06,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1316438966] [2022-11-19 06:37:06,315 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1316438966] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:37:06,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1295501190] [2022-11-19 06:37:06,344 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:37:06,344 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:37:06,348 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:37:06,355 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:37:06,356 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:37:06,977 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-11-19 06:37:06,993 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:37:07,052 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:37:13,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1295501190] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:37:13,354 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:37:13,354 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [8, 7] total 22 [2022-11-19 06:37:13,355 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270448314] [2022-11-19 06:37:13,355 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:37:13,356 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-19 06:37:13,356 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:37:13,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-19 06:37:13,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2022-11-19 06:37:13,357 INFO L87 Difference]: Start difference. First operand 43 states and 60 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, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-19 06:37:13,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:37:13,695 INFO L93 Difference]: Finished difference Result 57 states and 74 transitions. [2022-11-19 06:37:13,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-19 06:37:13,697 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, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 20 [2022-11-19 06:37:13,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:37:13,698 INFO L225 Difference]: With dead ends: 57 [2022-11-19 06:37:13,698 INFO L226 Difference]: Without dead ends: 50 [2022-11-19 06:37:13,699 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2022-11-19 06:37:13,700 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 6 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 06:37:13,701 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 109 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 105 Invalid, 0 Unknown, 18 Unchecked, 0.3s Time] [2022-11-19 06:37:13,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-19 06:37:13,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2022-11-19 06:37:13,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 34 states have (on average 1.3823529411764706) internal successors, (47), 35 states have internal predecessors, (47), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-19 06:37:13,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 66 transitions. [2022-11-19 06:37:13,740 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 66 transitions. Word has length 20 [2022-11-19 06:37:13,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:37:13,741 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 66 transitions. [2022-11-19 06:37:13,741 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, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-19 06:37:13,742 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 66 transitions. [2022-11-19 06:37:13,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-19 06:37:13,744 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:37:13,744 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:37:13,754 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 06:37:13,951 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:37:13,951 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:37:13,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:37:13,952 INFO L85 PathProgramCache]: Analyzing trace with hash 1929295880, now seen corresponding path program 1 times [2022-11-19 06:37:13,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:37:13,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909438550] [2022-11-19 06:37:13,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:37:13,953 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:37:13,963 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:37:13,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1435013068] [2022-11-19 06:37:13,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:37:13,964 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:37:13,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:37:13,965 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:37:13,988 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 06:37:14,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:37:14,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-19 06:37:14,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:37:14,086 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:37:14,086 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:37:14,086 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:37:14,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909438550] [2022-11-19 06:37:14,086 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:37:14,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1435013068] [2022-11-19 06:37:14,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1435013068] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:37:14,087 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:37:14,087 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-19 06:37:14,087 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912443723] [2022-11-19 06:37:14,087 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:37:14,088 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 06:37:14,088 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:37:14,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 06:37:14,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-19 06:37:14,089 INFO L87 Difference]: Start difference. First operand 49 states and 66 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-19 06:37:14,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:37:14,139 INFO L93 Difference]: Finished difference Result 86 states and 120 transitions. [2022-11-19 06:37:14,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 06:37:14,140 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2022-11-19 06:37:14,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:37:14,141 INFO L225 Difference]: With dead ends: 86 [2022-11-19 06:37:14,141 INFO L226 Difference]: Without dead ends: 51 [2022-11-19 06:37:14,141 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-19 06:37:14,142 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 2 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:37:14,143 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 87 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:37:14,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-11-19 06:37:14,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-11-19 06:37:14,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 37 states have internal predecessors, (49), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-19 06:37:14,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 68 transitions. [2022-11-19 06:37:14,163 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 68 transitions. Word has length 26 [2022-11-19 06:37:14,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:37:14,164 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 68 transitions. [2022-11-19 06:37:14,164 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-19 06:37:14,164 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 68 transitions. [2022-11-19 06:37:14,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-19 06:37:14,165 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:37:14,165 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:37:14,180 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 06:37:14,372 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:37:14,372 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:37:14,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:37:14,373 INFO L85 PathProgramCache]: Analyzing trace with hash 1808313670, now seen corresponding path program 1 times [2022-11-19 06:37:14,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:37:14,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [820980704] [2022-11-19 06:37:14,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:37:14,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:37:14,397 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:37:14,397 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [30402087] [2022-11-19 06:37:14,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:37:14,398 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:37:14,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:37:14,405 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:37:14,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 06:37:14,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:37:14,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-19 06:37:14,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:37:14,679 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-19 06:37:14,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:37:14,843 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-19 06:37:14,843 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:37:14,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [820980704] [2022-11-19 06:37:14,844 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:37:14,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [30402087] [2022-11-19 06:37:14,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [30402087] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:37:14,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [408225283] [2022-11-19 06:37:14,846 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-19 06:37:14,847 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:37:14,847 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:37:14,847 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:37:14,847 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:37:16,285 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 89 for LOIs [2022-11-19 06:37:16,437 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:37:16,475 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:37:28,910 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1226#(and (<= 2 ~counter~0) (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-19 06:37:28,911 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:37:28,911 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:37:28,911 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 12 [2022-11-19 06:37:28,911 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966675359] [2022-11-19 06:37:28,911 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:37:28,912 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-19 06:37:28,912 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:37:28,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-19 06:37:28,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=656, Unknown=1, NotChecked=0, Total=756 [2022-11-19 06:37:28,913 INFO L87 Difference]: Start difference. First operand 51 states and 68 transitions. Second operand has 12 states, 12 states have (on average 2.75) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-19 06:37:29,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:37:29,408 INFO L93 Difference]: Finished difference Result 71 states and 96 transitions. [2022-11-19 06:37:29,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-19 06:37:29,408 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) Word has length 30 [2022-11-19 06:37:29,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:37:29,410 INFO L225 Difference]: With dead ends: 71 [2022-11-19 06:37:29,410 INFO L226 Difference]: Without dead ends: 67 [2022-11-19 06:37:29,411 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=116, Invalid=753, Unknown=1, NotChecked=0, Total=870 [2022-11-19 06:37:29,412 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 83 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 06:37:29,412 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 136 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 06:37:29,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-11-19 06:37:29,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 37. [2022-11-19 06:37:29,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 26 states have internal predecessors, (32), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-19 06:37:29,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2022-11-19 06:37:29,433 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 30 [2022-11-19 06:37:29,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:37:29,434 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2022-11-19 06:37:29,434 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-19 06:37:29,434 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2022-11-19 06:37:29,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-19 06:37:29,435 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:37:29,435 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:37:29,447 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-19 06:37:29,642 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-19 06:37:29,642 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:37:29,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:37:29,643 INFO L85 PathProgramCache]: Analyzing trace with hash -2135719167, now seen corresponding path program 1 times [2022-11-19 06:37:29,643 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:37:29,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [839322945] [2022-11-19 06:37:29,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:37:29,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:37:29,653 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:37:29,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1232905724] [2022-11-19 06:37:29,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:37:29,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:37:29,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:37:29,655 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:37:29,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 06:37:29,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:37:29,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-19 06:37:29,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:37:29,775 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:37:29,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:37:29,851 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 06:37:29,852 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:37:29,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [839322945] [2022-11-19 06:37:29,852 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:37:29,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1232905724] [2022-11-19 06:37:29,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1232905724] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-19 06:37:29,853 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 06:37:29,853 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 10 [2022-11-19 06:37:29,853 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502082456] [2022-11-19 06:37:29,853 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:37:29,854 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-19 06:37:29,854 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:37:29,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-19 06:37:29,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-11-19 06:37:29,855 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-19 06:37:29,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:37:29,958 INFO L93 Difference]: Finished difference Result 67 states and 84 transitions. [2022-11-19 06:37:29,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 06:37:29,959 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2022-11-19 06:37:29,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:37:29,963 INFO L225 Difference]: With dead ends: 67 [2022-11-19 06:37:29,964 INFO L226 Difference]: Without dead ends: 46 [2022-11-19 06:37:29,964 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-11-19 06:37:29,966 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 15 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:37:29,966 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 125 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:37:29,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-19 06:37:30,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2022-11-19 06:37:30,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 32 states have (on average 1.21875) internal successors, (39), 32 states have internal predecessors, (39), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-19 06:37:30,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2022-11-19 06:37:30,009 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 32 [2022-11-19 06:37:30,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:37:30,011 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2022-11-19 06:37:30,011 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-19 06:37:30,011 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2022-11-19 06:37:30,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-19 06:37:30,020 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:37:30,021 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:37:30,031 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-19 06:37:30,227 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:37:30,228 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:37:30,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:37:30,228 INFO L85 PathProgramCache]: Analyzing trace with hash -301470394, now seen corresponding path program 1 times [2022-11-19 06:37:30,228 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:37:30,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1496631573] [2022-11-19 06:37:30,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:37:30,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:37:30,241 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:37:30,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [999403574] [2022-11-19 06:37:30,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:37:30,244 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:37:30,244 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:37:30,245 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:37:30,266 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 06:37:30,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:37:30,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-19 06:37:30,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:37:30,382 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:37:30,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:37:30,460 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 06:37:30,460 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:37:30,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1496631573] [2022-11-19 06:37:30,460 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:37:30,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [999403574] [2022-11-19 06:37:30,461 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [999403574] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:37:30,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [641076886] [2022-11-19 06:37:30,464 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-19 06:37:30,464 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:37:30,465 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:37:30,465 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:37:30,465 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:37:33,130 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-19 06:37:33,135 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:37:33,168 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:37:45,367 WARN L233 SmtUtils]: Spent 5.70s on a formula simplification. DAG size of input: 129 DAG size of output: 103 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 06:37:46,749 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1965#(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 [2022-11-19 06:37:46,749 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:37:46,750 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:37:46,750 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2022-11-19 06:37:46,750 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590985268] [2022-11-19 06:37:46,750 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:37:46,751 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-19 06:37:46,751 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:37:46,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-19 06:37:46,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=669, Unknown=0, NotChecked=0, Total=812 [2022-11-19 06:37:46,752 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-11-19 06:37:47,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:37:47,002 INFO L93 Difference]: Finished difference Result 122 states and 157 transitions. [2022-11-19 06:37:47,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-19 06:37:47,003 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 34 [2022-11-19 06:37:47,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:37:47,010 INFO L225 Difference]: With dead ends: 122 [2022-11-19 06:37:47,010 INFO L226 Difference]: Without dead ends: 101 [2022-11-19 06:37:47,011 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 372 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=173, Invalid=883, Unknown=0, NotChecked=0, Total=1056 [2022-11-19 06:37:47,013 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 71 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:37:47,013 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [71 Valid, 207 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:37:47,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-19 06:37:47,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 88. [2022-11-19 06:37:47,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 64 states have (on average 1.28125) internal successors, (82), 65 states have internal predecessors, (82), 16 states have call successors, (16), 8 states have call predecessors, (16), 7 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2022-11-19 06:37:47,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 113 transitions. [2022-11-19 06:37:47,073 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 113 transitions. Word has length 34 [2022-11-19 06:37:47,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:37:47,074 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 113 transitions. [2022-11-19 06:37:47,074 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-11-19 06:37:47,074 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 113 transitions. [2022-11-19 06:37:47,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-19 06:37:47,075 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:37:47,075 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, 1, 1, 1, 1, 1, 1] [2022-11-19 06:37:47,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-19 06:37:47,282 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:37:47,282 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:37:47,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:37:47,283 INFO L85 PathProgramCache]: Analyzing trace with hash 753982024, now seen corresponding path program 1 times [2022-11-19 06:37:47,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:37:47,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837153742] [2022-11-19 06:37:47,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:37:47,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:37:47,290 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:37:47,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1784059587] [2022-11-19 06:37:47,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:37:47,290 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:37:47,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:37:47,292 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:37:47,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-19 06:37:47,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:37:47,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-19 06:37:47,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:37:47,417 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-19 06:37:47,417 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:37:47,417 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:37:47,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837153742] [2022-11-19 06:37:47,418 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:37:47,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784059587] [2022-11-19 06:37:47,418 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784059587] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:37:47,418 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:37:47,432 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-19 06:37:47,432 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337156213] [2022-11-19 06:37:47,436 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:37:47,437 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 06:37:47,437 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:37:47,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 06:37:47,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-19 06:37:47,438 INFO L87 Difference]: Start difference. First operand 88 states and 113 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-11-19 06:37:47,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:37:47,523 INFO L93 Difference]: Finished difference Result 151 states and 201 transitions. [2022-11-19 06:37:47,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 06:37:47,524 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 38 [2022-11-19 06:37:47,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:37:47,527 INFO L225 Difference]: With dead ends: 151 [2022-11-19 06:37:47,527 INFO L226 Difference]: Without dead ends: 112 [2022-11-19 06:37:47,530 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-19 06:37:47,533 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 23 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:37:47,534 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 77 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:37:47,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2022-11-19 06:37:47,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 110. [2022-11-19 06:37:47,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 81 states have (on average 1.2839506172839505) internal successors, (104), 82 states have internal predecessors, (104), 21 states have call successors, (21), 8 states have call predecessors, (21), 7 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-19 06:37:47,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 145 transitions. [2022-11-19 06:37:47,597 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 145 transitions. Word has length 38 [2022-11-19 06:37:47,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:37:47,597 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 145 transitions. [2022-11-19 06:37:47,598 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-11-19 06:37:47,598 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 145 transitions. [2022-11-19 06:37:47,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-19 06:37:47,601 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:37:47,601 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:37:47,617 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-19 06:37:47,807 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-19 06:37:47,807 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:37:47,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:37:47,808 INFO L85 PathProgramCache]: Analyzing trace with hash 419809677, now seen corresponding path program 1 times [2022-11-19 06:37:47,808 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:37:47,808 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [130676505] [2022-11-19 06:37:47,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:37:47,808 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:37:47,814 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:37:47,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2141932201] [2022-11-19 06:37:47,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:37:47,815 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:37:47,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:37:47,816 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:37:47,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-19 06:37:47,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:37:47,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-19 06:37:47,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:37:47,960 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:37:47,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:37:48,053 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-19 06:37:48,053 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:37:48,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [130676505] [2022-11-19 06:37:48,053 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:37:48,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2141932201] [2022-11-19 06:37:48,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2141932201] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:37:48,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1503921404] [2022-11-19 06:37:48,056 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 06:37:48,056 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:37:48,057 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:37:48,057 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:37:48,057 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:37:50,391 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 55 for LOIs [2022-11-19 06:37:50,416 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:37:50,452 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:38:08,957 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3031#(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 [2022-11-19 06:38:08,957 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:38:08,957 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:38:08,958 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2022-11-19 06:38:08,958 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528487724] [2022-11-19 06:38:08,958 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:38:08,958 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-19 06:38:08,959 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:38:08,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-19 06:38:08,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=803, Unknown=0, NotChecked=0, Total=992 [2022-11-19 06:38:08,960 INFO L87 Difference]: Start difference. First operand 110 states and 145 transitions. Second operand has 12 states, 12 states have (on average 3.75) internal successors, (45), 12 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2022-11-19 06:38:09,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:38:09,324 INFO L93 Difference]: Finished difference Result 230 states and 311 transitions. [2022-11-19 06:38:09,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-19 06:38:09,325 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 12 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) Word has length 40 [2022-11-19 06:38:09,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:38:09,327 INFO L225 Difference]: With dead ends: 230 [2022-11-19 06:38:09,327 INFO L226 Difference]: Without dead ends: 175 [2022-11-19 06:38:09,328 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 18.6s TimeCoverageRelationStatistics Valid=231, Invalid=1101, Unknown=0, NotChecked=0, Total=1332 [2022-11-19 06:38:09,328 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 109 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:38:09,329 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [109 Valid, 278 Invalid, 181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 06:38:09,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2022-11-19 06:38:09,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 156. [2022-11-19 06:38:09,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 116 states have (on average 1.2844827586206897) internal successors, (149), 117 states have internal predecessors, (149), 30 states have call successors, (30), 10 states have call predecessors, (30), 9 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) [2022-11-19 06:38:09,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 208 transitions. [2022-11-19 06:38:09,389 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 208 transitions. Word has length 40 [2022-11-19 06:38:09,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:38:09,389 INFO L495 AbstractCegarLoop]: Abstraction has 156 states and 208 transitions. [2022-11-19 06:38:09,389 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 12 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2022-11-19 06:38:09,389 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 208 transitions. [2022-11-19 06:38:09,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-19 06:38:09,390 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:38:09,390 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:38:09,402 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-19 06:38:09,596 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-19 06:38:09,596 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:38:09,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:38:09,597 INFO L85 PathProgramCache]: Analyzing trace with hash -1579218988, now seen corresponding path program 1 times [2022-11-19 06:38:09,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:38:09,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [422119419] [2022-11-19 06:38:09,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:38:09,597 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:38:09,605 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:38:09,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2042466487] [2022-11-19 06:38:09,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:38:09,606 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:38:09,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:38:09,607 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:38:09,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-19 06:38:09,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:38:09,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-19 06:38:09,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:38:09,773 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:38:09,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:38:09,908 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-19 06:38:09,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:38:09,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [422119419] [2022-11-19 06:38:09,908 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:38:09,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2042466487] [2022-11-19 06:38:09,909 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2042466487] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:38:09,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [832594411] [2022-11-19 06:38:09,911 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 06:38:09,911 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:38:09,912 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:38:09,912 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:38:09,912 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:38:13,179 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-19 06:38:13,185 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:38:13,220 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:38:26,562 WARN L233 SmtUtils]: Spent 5.59s on a formula simplification. DAG size of input: 113 DAG size of output: 101 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 06:38:35,842 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3905#(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 [2022-11-19 06:38:35,842 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:38:35,842 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:38:35,842 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-11-19 06:38:35,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854805285] [2022-11-19 06:38:35,843 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:38:35,843 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-19 06:38:35,843 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:38:35,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-19 06:38:35,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=937, Unknown=0, NotChecked=0, Total=1122 [2022-11-19 06:38:35,844 INFO L87 Difference]: Start difference. First operand 156 states and 208 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, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2022-11-19 06:38:36,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:38:36,341 INFO L93 Difference]: Finished difference Result 252 states and 333 transitions. [2022-11-19 06:38:36,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-19 06:38:36,342 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, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) Word has length 46 [2022-11-19 06:38:36,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:38:36,344 INFO L225 Difference]: With dead ends: 252 [2022-11-19 06:38:36,345 INFO L226 Difference]: Without dead ends: 247 [2022-11-19 06:38:36,345 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 584 ImplicationChecksByTransitivity, 22.8s TimeCoverageRelationStatistics Valid=244, Invalid=1316, Unknown=0, NotChecked=0, Total=1560 [2022-11-19 06:38:36,346 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 220 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 06:38:36,347 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [220 Valid, 234 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 06:38:36,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2022-11-19 06:38:36,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 212. [2022-11-19 06:38:36,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 157 states have (on average 1.286624203821656) internal successors, (202), 162 states have internal predecessors, (202), 43 states have call successors, (43), 12 states have call predecessors, (43), 11 states have return successors, (42), 37 states have call predecessors, (42), 42 states have call successors, (42) [2022-11-19 06:38:36,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 287 transitions. [2022-11-19 06:38:36,429 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 287 transitions. Word has length 46 [2022-11-19 06:38:36,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:38:36,429 INFO L495 AbstractCegarLoop]: Abstraction has 212 states and 287 transitions. [2022-11-19 06:38:36,429 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, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2022-11-19 06:38:36,430 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 287 transitions. [2022-11-19 06:38:36,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-19 06:38:36,431 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:38:36,431 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:38:36,437 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-19 06:38:36,635 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:38:36,635 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:38:36,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:38:36,635 INFO L85 PathProgramCache]: Analyzing trace with hash -1252121023, now seen corresponding path program 1 times [2022-11-19 06:38:36,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:38:36,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445746315] [2022-11-19 06:38:36,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:38:36,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:38:36,649 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:38:36,649 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1050387141] [2022-11-19 06:38:36,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:38:36,650 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:38:36,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:38:36,651 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:38:36,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-19 06:38:36,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:38:36,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-19 06:38:36,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:38:36,954 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 4 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-19 06:38:36,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:38:37,399 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 4 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-19 06:38:37,400 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:38:37,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445746315] [2022-11-19 06:38:37,400 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:38:37,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1050387141] [2022-11-19 06:38:37,400 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1050387141] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:38:37,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [534921708] [2022-11-19 06:38:37,408 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 06:38:37,408 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:38:37,409 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:38:37,409 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:38:37,410 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:38:42,154 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-19 06:38:42,160 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:38:42,194 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:38:54,202 WARN L233 SmtUtils]: Spent 6.55s on a formula simplification. DAG size of input: 113 DAG size of output: 101 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 06:39:04,760 WARN L233 SmtUtils]: Spent 5.73s on a formula simplification. DAG size of input: 113 DAG size of output: 103 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 06:39:08,823 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4933#(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 [2022-11-19 06:39:08,824 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:39:08,824 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:39:08,824 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2022-11-19 06:39:08,824 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499774657] [2022-11-19 06:39:08,824 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:39:08,824 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-19 06:39:08,825 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:39:08,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-19 06:39:08,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=923, Unknown=0, NotChecked=0, Total=1056 [2022-11-19 06:39:08,826 INFO L87 Difference]: Start difference. First operand 212 states and 287 transitions. Second operand has 13 states, 12 states have (on average 2.75) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-19 06:39:11,047 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 06:39:13,281 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.95s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 06:39:13,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:39:13,428 INFO L93 Difference]: Finished difference Result 308 states and 423 transitions. [2022-11-19 06:39:13,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-19 06:39:13,430 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.75) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) Word has length 52 [2022-11-19 06:39:13,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:39:13,432 INFO L225 Difference]: With dead ends: 308 [2022-11-19 06:39:13,432 INFO L226 Difference]: Without dead ends: 218 [2022-11-19 06:39:13,433 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 120 SyntacticMatches, 4 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 26.9s TimeCoverageRelationStatistics Valid=149, Invalid=1041, Unknown=0, NotChecked=0, Total=1190 [2022-11-19 06:39:13,434 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 55 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 21 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-11-19 06:39:13,435 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 185 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 215 Invalid, 1 Unknown, 0 Unchecked, 4.4s Time] [2022-11-19 06:39:13,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2022-11-19 06:39:13,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 200. [2022-11-19 06:39:13,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 148 states have (on average 1.2297297297297298) internal successors, (182), 151 states have internal predecessors, (182), 40 states have call successors, (40), 12 states have call predecessors, (40), 11 states have return successors, (39), 36 states have call predecessors, (39), 39 states have call successors, (39) [2022-11-19 06:39:13,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 261 transitions. [2022-11-19 06:39:13,501 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 261 transitions. Word has length 52 [2022-11-19 06:39:13,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:39:13,502 INFO L495 AbstractCegarLoop]: Abstraction has 200 states and 261 transitions. [2022-11-19 06:39:13,502 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.75) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-19 06:39:13,502 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 261 transitions. [2022-11-19 06:39:13,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-19 06:39:13,504 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:39:13,504 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:39:13,510 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-19 06:39:13,710 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:39:13,710 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:39:13,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:39:13,711 INFO L85 PathProgramCache]: Analyzing trace with hash -703296414, now seen corresponding path program 1 times [2022-11-19 06:39:13,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:39:13,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1307030767] [2022-11-19 06:39:13,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:39:13,711 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:39:13,719 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:39:13,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2074550160] [2022-11-19 06:39:13,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:39:13,723 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:39:13,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:39:13,724 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:39:13,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-19 06:39:13,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:39:13,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-19 06:39:13,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:39:13,854 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 64 proven. 12 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2022-11-19 06:39:13,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:39:13,941 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 38 proven. 12 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2022-11-19 06:39:13,941 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:39:13,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1307030767] [2022-11-19 06:39:13,942 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:39:13,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2074550160] [2022-11-19 06:39:13,942 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2074550160] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:39:13,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [41533925] [2022-11-19 06:39:13,944 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 06:39:13,945 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:39:13,945 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:39:13,945 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:39:13,945 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:39:16,593 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-19 06:39:16,649 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:39:16,690 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:39:18,774 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6191#(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 [2022-11-19 06:39:18,774 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:39:18,775 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:39:18,775 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2022-11-19 06:39:18,775 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654728558] [2022-11-19 06:39:18,775 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:39:18,775 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 06:39:18,776 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:39:18,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 06:39:18,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=420, Unknown=0, NotChecked=0, Total=506 [2022-11-19 06:39:18,777 INFO L87 Difference]: Start difference. First operand 200 states and 261 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-19 06:39:18,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:39:18,969 INFO L93 Difference]: Finished difference Result 492 states and 676 transitions. [2022-11-19 06:39:18,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 06:39:18,975 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 82 [2022-11-19 06:39:18,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:39:18,985 INFO L225 Difference]: With dead ends: 492 [2022-11-19 06:39:18,985 INFO L226 Difference]: Without dead ends: 356 [2022-11-19 06:39:18,986 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 221 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2022-11-19 06:39:18,988 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 16 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:39:18,988 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 115 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:39:18,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2022-11-19 06:39:19,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 345. [2022-11-19 06:39:19,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 259 states have (on average 1.2664092664092663) internal successors, (328), 265 states have internal predecessors, (328), 74 states have call successors, (74), 12 states have call predecessors, (74), 11 states have return successors, (73), 67 states have call predecessors, (73), 73 states have call successors, (73) [2022-11-19 06:39:19,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 475 transitions. [2022-11-19 06:39:19,114 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 475 transitions. Word has length 82 [2022-11-19 06:39:19,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:39:19,115 INFO L495 AbstractCegarLoop]: Abstraction has 345 states and 475 transitions. [2022-11-19 06:39:19,115 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-19 06:39:19,116 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 475 transitions. [2022-11-19 06:39:19,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-19 06:39:19,118 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:39:19,118 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:39:19,124 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-19 06:39:19,324 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-19 06:39:19,324 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:39:19,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:39:19,324 INFO L85 PathProgramCache]: Analyzing trace with hash -1378770924, now seen corresponding path program 2 times [2022-11-19 06:39:19,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:39:19,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682325653] [2022-11-19 06:39:19,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:39:19,325 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:39:19,331 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:39:19,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [781347137] [2022-11-19 06:39:19,332 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:39:19,332 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:39:19,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:39:19,333 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:39:19,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-19 06:39:19,409 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 06:39:19,409 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:39:19,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-19 06:39:19,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:39:19,434 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2022-11-19 06:39:19,434 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:39:19,434 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:39:19,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682325653] [2022-11-19 06:39:19,434 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:39:19,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [781347137] [2022-11-19 06:39:19,434 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [781347137] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:39:19,435 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:39:19,435 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-19 06:39:19,435 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260512423] [2022-11-19 06:39:19,435 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:39:19,435 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 06:39:19,436 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:39:19,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 06:39:19,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-19 06:39:19,436 INFO L87 Difference]: Start difference. First operand 345 states and 475 transitions. Second operand has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-19 06:39:19,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:39:19,669 INFO L93 Difference]: Finished difference Result 591 states and 827 transitions. [2022-11-19 06:39:19,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 06:39:19,670 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 82 [2022-11-19 06:39:19,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:39:19,674 INFO L225 Difference]: With dead ends: 591 [2022-11-19 06:39:19,675 INFO L226 Difference]: Without dead ends: 442 [2022-11-19 06:39:19,675 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-19 06:39:19,676 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 17 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:39:19,676 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 133 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:39:19,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2022-11-19 06:39:19,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 375. [2022-11-19 06:39:19,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 375 states, 284 states have (on average 1.2464788732394365) internal successors, (354), 290 states have internal predecessors, (354), 78 states have call successors, (78), 13 states have call predecessors, (78), 12 states have return successors, (77), 71 states have call predecessors, (77), 77 states have call successors, (77) [2022-11-19 06:39:19,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 375 states to 375 states and 509 transitions. [2022-11-19 06:39:19,827 INFO L78 Accepts]: Start accepts. Automaton has 375 states and 509 transitions. Word has length 82 [2022-11-19 06:39:19,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:39:19,828 INFO L495 AbstractCegarLoop]: Abstraction has 375 states and 509 transitions. [2022-11-19 06:39:19,828 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-19 06:39:19,828 INFO L276 IsEmpty]: Start isEmpty. Operand 375 states and 509 transitions. [2022-11-19 06:39:19,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-19 06:39:19,830 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:39:19,831 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:39:19,841 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-19 06:39:20,042 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-19 06:39:20,042 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:39:20,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:39:20,043 INFO L85 PathProgramCache]: Analyzing trace with hash -760314426, now seen corresponding path program 3 times [2022-11-19 06:39:20,044 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:39:20,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [55951268] [2022-11-19 06:39:20,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:39:20,044 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:39:20,064 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:39:20,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [602754722] [2022-11-19 06:39:20,066 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:39:20,066 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:39:20,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:39:20,068 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:39:20,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-19 06:39:20,259 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:39:20,259 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:39:20,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-19 06:39:20,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:39:20,444 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 24 proven. 152 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:39:20,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:39:20,665 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 24 proven. 40 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-11-19 06:39:20,665 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:39:20,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [55951268] [2022-11-19 06:39:20,665 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:39:20,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [602754722] [2022-11-19 06:39:20,665 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [602754722] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:39:20,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1250134157] [2022-11-19 06:39:20,667 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 06:39:20,667 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:39:20,668 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:39:20,668 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:39:20,668 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:39:24,657 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-19 06:39:24,672 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:39:24,708 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:39:36,698 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9638#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 104) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:39:36,699 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:39:36,699 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:39:36,699 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 22 [2022-11-19 06:39:36,699 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476912844] [2022-11-19 06:39:36,699 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:39:36,700 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-19 06:39:36,700 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:39:36,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-19 06:39:36,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=377, Invalid=1515, Unknown=0, NotChecked=0, Total=1892 [2022-11-19 06:39:36,702 INFO L87 Difference]: Start difference. First operand 375 states and 509 transitions. Second operand has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 22 states have internal predecessors, (92), 19 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 18 states have call predecessors, (20), 18 states have call successors, (20) [2022-11-19 06:39:38,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:39:38,131 INFO L93 Difference]: Finished difference Result 1151 states and 1656 transitions. [2022-11-19 06:39:38,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-19 06:39:38,132 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 22 states have internal predecessors, (92), 19 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 18 states have call predecessors, (20), 18 states have call successors, (20) Word has length 82 [2022-11-19 06:39:38,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:39:38,139 INFO L225 Difference]: With dead ends: 1151 [2022-11-19 06:39:38,139 INFO L226 Difference]: Without dead ends: 1100 [2022-11-19 06:39:38,141 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 202 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1235 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=689, Invalid=2851, Unknown=0, NotChecked=0, Total=3540 [2022-11-19 06:39:38,142 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 670 mSDsluCounter, 378 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 378 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 670 SdHoareTripleChecker+Valid, 450 SdHoareTripleChecker+Invalid, 646 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 378 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 06:39:38,142 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [670 Valid, 450 Invalid, 646 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [378 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 06:39:38,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1100 states. [2022-11-19 06:39:38,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1100 to 1040. [2022-11-19 06:39:38,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1040 states, 785 states have (on average 1.2560509554140127) internal successors, (986), 794 states have internal predecessors, (986), 234 states have call successors, (234), 21 states have call predecessors, (234), 20 states have return successors, (233), 224 states have call predecessors, (233), 233 states have call successors, (233) [2022-11-19 06:39:38,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1040 states to 1040 states and 1453 transitions. [2022-11-19 06:39:38,480 INFO L78 Accepts]: Start accepts. Automaton has 1040 states and 1453 transitions. Word has length 82 [2022-11-19 06:39:38,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:39:38,480 INFO L495 AbstractCegarLoop]: Abstraction has 1040 states and 1453 transitions. [2022-11-19 06:39:38,481 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 22 states have internal predecessors, (92), 19 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 18 states have call predecessors, (20), 18 states have call successors, (20) [2022-11-19 06:39:38,481 INFO L276 IsEmpty]: Start isEmpty. Operand 1040 states and 1453 transitions. [2022-11-19 06:39:38,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-11-19 06:39:38,483 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:39:38,483 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:39:38,490 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-19 06:39:38,689 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-19 06:39:38,690 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:39:38,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:39:38,691 INFO L85 PathProgramCache]: Analyzing trace with hash -1887960563, now seen corresponding path program 1 times [2022-11-19 06:39:38,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:39:38,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1938349543] [2022-11-19 06:39:38,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:39:38,691 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:39:38,700 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:39:38,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [944023961] [2022-11-19 06:39:38,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:39:38,701 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:39:38,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:39:38,702 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:39:38,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-19 06:39:38,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:39:38,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-19 06:39:38,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:39:39,000 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 22 proven. 190 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:39:39,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:39:39,311 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 22 proven. 46 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2022-11-19 06:39:39,311 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:39:39,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1938349543] [2022-11-19 06:39:39,311 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:39:39,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [944023961] [2022-11-19 06:39:39,312 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [944023961] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:39:39,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [890891494] [2022-11-19 06:39:39,314 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 06:39:39,314 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:39:39,315 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:39:39,315 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:39:39,315 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:39:44,637 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-19 06:39:44,643 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:39:44,678 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:39:52,397 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13492#(and (<= ~counter~0 103) (= |__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 [2022-11-19 06:39:52,397 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:39:52,397 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:39:52,397 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 24 [2022-11-19 06:39:52,398 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602550146] [2022-11-19 06:39:52,398 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:39:52,398 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-19 06:39:52,399 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:39:52,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-19 06:39:52,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=1480, Unknown=0, NotChecked=0, Total=1892 [2022-11-19 06:39:52,400 INFO L87 Difference]: Start difference. First operand 1040 states and 1453 transitions. Second operand has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) [2022-11-19 06:39:53,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:39:53,748 INFO L93 Difference]: Finished difference Result 1518 states and 2107 transitions. [2022-11-19 06:39:53,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-19 06:39:53,749 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) Word has length 88 [2022-11-19 06:39:53,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:39:53,754 INFO L225 Difference]: With dead ends: 1518 [2022-11-19 06:39:53,754 INFO L226 Difference]: Without dead ends: 820 [2022-11-19 06:39:53,757 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 220 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1228 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=760, Invalid=2900, Unknown=0, NotChecked=0, Total=3660 [2022-11-19 06:39:53,758 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 543 mSDsluCounter, 419 mSDsCounter, 0 mSdLazyCounter, 373 mSolverCounterSat, 280 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 543 SdHoareTripleChecker+Valid, 497 SdHoareTripleChecker+Invalid, 653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 280 IncrementalHoareTripleChecker+Valid, 373 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 06:39:53,758 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [543 Valid, 497 Invalid, 653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [280 Valid, 373 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 06:39:53,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 820 states. [2022-11-19 06:39:54,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 820 to 764. [2022-11-19 06:39:54,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 764 states, 573 states have (on average 1.2076788830715532) internal successors, (692), 578 states have internal predecessors, (692), 168 states have call successors, (168), 23 states have call predecessors, (168), 22 states have return successors, (167), 162 states have call predecessors, (167), 167 states have call successors, (167) [2022-11-19 06:39:54,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 764 states to 764 states and 1027 transitions. [2022-11-19 06:39:54,108 INFO L78 Accepts]: Start accepts. Automaton has 764 states and 1027 transitions. Word has length 88 [2022-11-19 06:39:54,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:39:54,109 INFO L495 AbstractCegarLoop]: Abstraction has 764 states and 1027 transitions. [2022-11-19 06:39:54,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) [2022-11-19 06:39:54,109 INFO L276 IsEmpty]: Start isEmpty. Operand 764 states and 1027 transitions. [2022-11-19 06:39:54,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-11-19 06:39:54,112 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:39:54,112 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:39:54,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-19 06:39:54,317 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-19 06:39:54,318 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:39:54,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:39:54,318 INFO L85 PathProgramCache]: Analyzing trace with hash -890970028, now seen corresponding path program 1 times [2022-11-19 06:39:54,318 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:39:54,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [839757204] [2022-11-19 06:39:54,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:39:54,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:39:54,328 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:39:54,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2032927671] [2022-11-19 06:39:54,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:39:54,329 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:39:54,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:39:54,330 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:39:54,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-19 06:39:54,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:39:54,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-19 06:39:54,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:39:54,669 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 20 proven. 236 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:39:54,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:39:55,033 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 20 proven. 56 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2022-11-19 06:39:55,033 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:39:55,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [839757204] [2022-11-19 06:39:55,033 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:39:55,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2032927671] [2022-11-19 06:39:55,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2032927671] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:39:55,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [141727890] [2022-11-19 06:39:55,036 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 06:39:55,036 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:39:55,036 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:39:55,036 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:39:55,037 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:39:58,443 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-19 06:39:58,448 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:39:58,493 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:40:07,927 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17505#(and (<= ~counter~0 102) (= |__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 [2022-11-19 06:40:07,927 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:40:07,927 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:40:07,927 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2022-11-19 06:40:07,927 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164639102] [2022-11-19 06:40:07,927 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:40:07,928 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-19 06:40:07,928 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:40:07,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-19 06:40:07,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=457, Invalid=1523, Unknown=0, NotChecked=0, Total=1980 [2022-11-19 06:40:07,930 INFO L87 Difference]: Start difference. First operand 764 states and 1027 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, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) [2022-11-19 06:40:09,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:40:09,472 INFO L93 Difference]: Finished difference Result 875 states and 1183 transitions. [2022-11-19 06:40:09,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-19 06:40:09,473 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, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) Word has length 94 [2022-11-19 06:40:09,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:40:09,477 INFO L225 Difference]: With dead ends: 875 [2022-11-19 06:40:09,478 INFO L226 Difference]: Without dead ends: 870 [2022-11-19 06:40:09,480 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 235 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1354 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=846, Invalid=3060, Unknown=0, NotChecked=0, Total=3906 [2022-11-19 06:40:09,480 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 554 mSDsluCounter, 423 mSDsCounter, 0 mSdLazyCounter, 365 mSolverCounterSat, 306 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 554 SdHoareTripleChecker+Valid, 507 SdHoareTripleChecker+Invalid, 671 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 306 IncrementalHoareTripleChecker+Valid, 365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 06:40:09,481 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [554 Valid, 507 Invalid, 671 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [306 Valid, 365 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 06:40:09,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 870 states. [2022-11-19 06:40:09,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 870 to 855. [2022-11-19 06:40:09,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 855 states, 644 states have (on average 1.1832298136645962) internal successors, (762), 650 states have internal predecessors, (762), 186 states have call successors, (186), 25 states have call predecessors, (186), 24 states have return successors, (185), 179 states have call predecessors, (185), 185 states have call successors, (185) [2022-11-19 06:40:09,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 855 states to 855 states and 1133 transitions. [2022-11-19 06:40:09,872 INFO L78 Accepts]: Start accepts. Automaton has 855 states and 1133 transitions. Word has length 94 [2022-11-19 06:40:09,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:40:09,872 INFO L495 AbstractCegarLoop]: Abstraction has 855 states and 1133 transitions. [2022-11-19 06:40:09,873 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, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) [2022-11-19 06:40:09,873 INFO L276 IsEmpty]: Start isEmpty. Operand 855 states and 1133 transitions. [2022-11-19 06:40:09,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-19 06:40:09,884 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:40:09,885 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:40:09,897 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-19 06:40:10,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-19 06:40:10,091 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:40:10,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:40:10,093 INFO L85 PathProgramCache]: Analyzing trace with hash -1384815896, now seen corresponding path program 4 times [2022-11-19 06:40:10,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:40:10,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [293252040] [2022-11-19 06:40:10,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:10,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:40:10,112 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:40:10,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2017628113] [2022-11-19 06:40:10,112 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:40:10,112 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:10,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:40:10,114 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:40:10,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-19 06:40:10,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:40:10,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 06:40:10,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:40:10,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 612 proven. 0 refuted. 0 times theorem prover too weak. 490 trivial. 0 not checked. [2022-11-19 06:40:10,270 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:40:10,271 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:40:10,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [293252040] [2022-11-19 06:40:10,271 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:40:10,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2017628113] [2022-11-19 06:40:10,272 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2017628113] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:40:10,272 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:40:10,272 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 06:40:10,272 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009035569] [2022-11-19 06:40:10,272 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:40:10,273 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 06:40:10,273 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:40:10,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 06:40:10,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 06:40:10,274 INFO L87 Difference]: Start difference. First operand 855 states and 1133 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-19 06:40:10,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:40:10,761 INFO L93 Difference]: Finished difference Result 1450 states and 1919 transitions. [2022-11-19 06:40:10,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 06:40:10,762 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 178 [2022-11-19 06:40:10,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:40:10,767 INFO L225 Difference]: With dead ends: 1450 [2022-11-19 06:40:10,768 INFO L226 Difference]: Without dead ends: 919 [2022-11-19 06:40:10,769 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 06:40:10,770 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 3 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:40:10,771 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 65 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:40:10,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 919 states. [2022-11-19 06:40:11,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 919 to 846. [2022-11-19 06:40:11,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 846 states, 640 states have (on average 1.171875) internal successors, (750), 649 states have internal predecessors, (750), 181 states have call successors, (181), 25 states have call predecessors, (181), 24 states have return successors, (180), 171 states have call predecessors, (180), 180 states have call successors, (180) [2022-11-19 06:40:11,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 846 states to 846 states and 1111 transitions. [2022-11-19 06:40:11,142 INFO L78 Accepts]: Start accepts. Automaton has 846 states and 1111 transitions. Word has length 178 [2022-11-19 06:40:11,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:40:11,143 INFO L495 AbstractCegarLoop]: Abstraction has 846 states and 1111 transitions. [2022-11-19 06:40:11,143 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-19 06:40:11,143 INFO L276 IsEmpty]: Start isEmpty. Operand 846 states and 1111 transitions. [2022-11-19 06:40:11,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-19 06:40:11,149 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:40:11,149 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 9, 8, 8, 8, 8, 7, 7, 7, 6, 5, 5, 5, 5, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:40:11,161 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-19 06:40:11,355 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-19 06:40:11,356 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:40:11,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:40:11,356 INFO L85 PathProgramCache]: Analyzing trace with hash 437435780, now seen corresponding path program 5 times [2022-11-19 06:40:11,356 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:40:11,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1122068127] [2022-11-19 06:40:11,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:11,357 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:40:11,369 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:40:11,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1825380146] [2022-11-19 06:40:11,369 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:40:11,370 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:11,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:40:11,371 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:40:11,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-19 06:40:11,462 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-19 06:40:11,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:40:11,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-19 06:40:11,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:40:11,504 INFO L134 CoverageAnalysis]: Checked inductivity of 1078 backedges. 120 proven. 0 refuted. 0 times theorem prover too weak. 958 trivial. 0 not checked. [2022-11-19 06:40:11,505 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:40:11,505 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:40:11,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1122068127] [2022-11-19 06:40:11,505 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:40:11,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1825380146] [2022-11-19 06:40:11,505 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1825380146] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:40:11,506 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:40:11,506 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-19 06:40:11,506 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21180220] [2022-11-19 06:40:11,506 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:40:11,507 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 06:40:11,507 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:40:11,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 06:40:11,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-19 06:40:11,508 INFO L87 Difference]: Start difference. First operand 846 states and 1111 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-11-19 06:40:11,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:40:11,817 INFO L93 Difference]: Finished difference Result 858 states and 1121 transitions. [2022-11-19 06:40:11,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 06:40:11,818 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 178 [2022-11-19 06:40:11,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:40:11,822 INFO L225 Difference]: With dead ends: 858 [2022-11-19 06:40:11,822 INFO L226 Difference]: Without dead ends: 807 [2022-11-19 06:40:11,823 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-19 06:40:11,824 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 12 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:40:11,824 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 79 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:40:11,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 807 states. [2022-11-19 06:40:12,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 807 to 792. [2022-11-19 06:40:12,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 792 states, 598 states have (on average 1.1672240802675586) internal successors, (698), 605 states have internal predecessors, (698), 169 states have call successors, (169), 25 states have call predecessors, (169), 24 states have return successors, (168), 161 states have call predecessors, (168), 168 states have call successors, (168) [2022-11-19 06:40:12,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 792 states to 792 states and 1035 transitions. [2022-11-19 06:40:12,176 INFO L78 Accepts]: Start accepts. Automaton has 792 states and 1035 transitions. Word has length 178 [2022-11-19 06:40:12,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:40:12,177 INFO L495 AbstractCegarLoop]: Abstraction has 792 states and 1035 transitions. [2022-11-19 06:40:12,177 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-11-19 06:40:12,177 INFO L276 IsEmpty]: Start isEmpty. Operand 792 states and 1035 transitions. [2022-11-19 06:40:12,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-19 06:40:12,182 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:40:12,182 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 7, 7, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:40:12,191 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-19 06:40:12,389 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:12,389 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:40:12,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:40:12,389 INFO L85 PathProgramCache]: Analyzing trace with hash -223810874, now seen corresponding path program 6 times [2022-11-19 06:40:12,389 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:40:12,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619725868] [2022-11-19 06:40:12,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:12,390 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:40:12,411 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:40:12,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1550605588] [2022-11-19 06:40:12,412 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:40:12,412 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:12,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:40:12,413 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:40:12,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-19 06:40:12,529 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:40:12,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:40:12,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-19 06:40:12,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:40:12,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 280 proven. 184 refuted. 0 times theorem prover too weak. 642 trivial. 0 not checked. [2022-11-19 06:40:12,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:40:12,962 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 140 proven. 184 refuted. 0 times theorem prover too weak. 782 trivial. 0 not checked. [2022-11-19 06:40:12,963 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:40:12,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619725868] [2022-11-19 06:40:12,963 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:40:12,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1550605588] [2022-11-19 06:40:12,963 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1550605588] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:40:12,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1056451779] [2022-11-19 06:40:12,965 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 06:40:12,965 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:40:12,965 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:40:12,966 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:40:12,966 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:40:15,605 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-19 06:40:15,658 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:40:15,690 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:40:20,151 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28081#(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 [2022-11-19 06:40:20,151 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:40:20,151 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:40:20,152 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2022-11-19 06:40:20,152 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137589748] [2022-11-19 06:40:20,152 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:40:20,153 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-19 06:40:20,154 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:40:20,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-19 06:40:20,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=712, Unknown=0, NotChecked=0, Total=812 [2022-11-19 06:40:20,155 INFO L87 Difference]: Start difference. First operand 792 states and 1035 transitions. Second operand has 10 states, 10 states have (on average 7.3) internal successors, (73), 10 states have internal predecessors, (73), 10 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 10 states have call predecessors, (21), 10 states have call successors, (21) [2022-11-19 06:40:21,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:40:21,669 INFO L93 Difference]: Finished difference Result 1829 states and 2460 transitions. [2022-11-19 06:40:21,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-19 06:40:21,670 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 7.3) internal successors, (73), 10 states have internal predecessors, (73), 10 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 10 states have call predecessors, (21), 10 states have call successors, (21) Word has length 178 [2022-11-19 06:40:21,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:40:21,678 INFO L225 Difference]: With dead ends: 1829 [2022-11-19 06:40:21,678 INFO L226 Difference]: Without dead ends: 1606 [2022-11-19 06:40:21,681 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 499 SyntacticMatches, 6 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 415 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=190, Invalid=1616, Unknown=0, NotChecked=0, Total=1806 [2022-11-19 06:40:21,683 INFO L413 NwaCegarLoop]: 197 mSDtfsCounter, 133 mSDsluCounter, 554 mSDsCounter, 0 mSdLazyCounter, 663 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 751 SdHoareTripleChecker+Invalid, 712 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 663 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 06:40:21,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [137 Valid, 751 Invalid, 712 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 663 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 06:40:21,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1606 states. [2022-11-19 06:40:22,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1606 to 1375. [2022-11-19 06:40:22,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1375 states, 1039 states have (on average 1.1828681424446583) internal successors, (1229), 1055 states have internal predecessors, (1229), 311 states have call successors, (311), 25 states have call predecessors, (311), 24 states have return successors, (310), 294 states have call predecessors, (310), 310 states have call successors, (310) [2022-11-19 06:40:22,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1375 states to 1375 states and 1850 transitions. [2022-11-19 06:40:22,394 INFO L78 Accepts]: Start accepts. Automaton has 1375 states and 1850 transitions. Word has length 178 [2022-11-19 06:40:22,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:40:22,399 INFO L495 AbstractCegarLoop]: Abstraction has 1375 states and 1850 transitions. [2022-11-19 06:40:22,400 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 7.3) internal successors, (73), 10 states have internal predecessors, (73), 10 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 10 states have call predecessors, (21), 10 states have call successors, (21) [2022-11-19 06:40:22,400 INFO L276 IsEmpty]: Start isEmpty. Operand 1375 states and 1850 transitions. [2022-11-19 06:40:22,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-19 06:40:22,407 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:40:22,407 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 10, 9, 9, 9, 8, 7, 7, 7, 6, 5, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:40:22,420 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-19 06:40:22,614 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:22,614 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:40:22,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:40:22,615 INFO L85 PathProgramCache]: Analyzing trace with hash -654614764, now seen corresponding path program 7 times [2022-11-19 06:40:22,615 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:40:22,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1921454817] [2022-11-19 06:40:22,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:22,616 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:40:22,638 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:40:22,638 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [238532516] [2022-11-19 06:40:22,639 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:40:22,639 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:22,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:40:22,640 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:40:22,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-19 06:40:22,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:40:22,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-19 06:40:22,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:40:22,964 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 516 proven. 84 refuted. 0 times theorem prover too weak. 494 trivial. 0 not checked. [2022-11-19 06:40:22,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:40:23,214 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 226 proven. 84 refuted. 0 times theorem prover too weak. 784 trivial. 0 not checked. [2022-11-19 06:40:23,214 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:40:23,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1921454817] [2022-11-19 06:40:23,215 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:40:23,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [238532516] [2022-11-19 06:40:23,215 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [238532516] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:40:23,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1648573802] [2022-11-19 06:40:23,217 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 06:40:23,217 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:40:23,217 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:40:23,217 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:40:23,218 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:40:25,566 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-19 06:40:25,639 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:40:25,669 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:40:28,697 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33982#(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 [2022-11-19 06:40:28,697 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:40:28,698 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:40:28,698 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2022-11-19 06:40:28,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24923412] [2022-11-19 06:40:28,698 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:40:28,699 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-19 06:40:28,699 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:40:28,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-19 06:40:28,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2022-11-19 06:40:28,700 INFO L87 Difference]: Start difference. First operand 1375 states and 1850 transitions. Second operand has 14 states, 14 states have (on average 7.5) internal successors, (105), 14 states have internal predecessors, (105), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) [2022-11-19 06:40:31,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:40:31,285 INFO L93 Difference]: Finished difference Result 2960 states and 4046 transitions. [2022-11-19 06:40:31,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-19 06:40:31,286 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 7.5) internal successors, (105), 14 states have internal predecessors, (105), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) Word has length 178 [2022-11-19 06:40:31,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:40:31,298 INFO L225 Difference]: With dead ends: 2960 [2022-11-19 06:40:31,299 INFO L226 Difference]: Without dead ends: 2637 [2022-11-19 06:40:31,302 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 580 GetRequests, 525 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 770 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=448, Invalid=2744, Unknown=0, NotChecked=0, Total=3192 [2022-11-19 06:40:31,303 INFO L413 NwaCegarLoop]: 156 mSDtfsCounter, 207 mSDsluCounter, 548 mSDsCounter, 0 mSdLazyCounter, 742 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 704 SdHoareTripleChecker+Invalid, 852 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 742 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 06:40:31,304 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [212 Valid, 704 Invalid, 852 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 742 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 06:40:31,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2637 states. [2022-11-19 06:40:32,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2637 to 2039. [2022-11-19 06:40:32,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2039 states, 1536 states have (on average 1.1725260416666667) internal successors, (1801), 1564 states have internal predecessors, (1801), 478 states have call successors, (478), 25 states have call predecessors, (478), 24 states have return successors, (477), 449 states have call predecessors, (477), 477 states have call successors, (477) [2022-11-19 06:40:32,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2039 states to 2039 states and 2756 transitions. [2022-11-19 06:40:32,456 INFO L78 Accepts]: Start accepts. Automaton has 2039 states and 2756 transitions. Word has length 178 [2022-11-19 06:40:32,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:40:32,457 INFO L495 AbstractCegarLoop]: Abstraction has 2039 states and 2756 transitions. [2022-11-19 06:40:32,457 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 7.5) internal successors, (105), 14 states have internal predecessors, (105), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) [2022-11-19 06:40:32,458 INFO L276 IsEmpty]: Start isEmpty. Operand 2039 states and 2756 transitions. [2022-11-19 06:40:32,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-19 06:40:32,466 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:40:32,467 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 7, 7, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:40:32,473 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-19 06:40:32,673 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:32,673 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:40:32,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:40:32,674 INFO L85 PathProgramCache]: Analyzing trace with hash 1253226182, now seen corresponding path program 8 times [2022-11-19 06:40:32,674 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:40:32,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111377972] [2022-11-19 06:40:32,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:32,674 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:40:32,708 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:40:32,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [408337254] [2022-11-19 06:40:32,708 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:40:32,708 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:32,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:40:32,719 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:40:32,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-19 06:40:33,729 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-19 06:40:33,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:40:33,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-19 06:40:33,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:40:34,040 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 84 proven. 248 refuted. 0 times theorem prover too weak. 774 trivial. 0 not checked. [2022-11-19 06:40:34,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:40:34,426 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 84 proven. 248 refuted. 0 times theorem prover too weak. 774 trivial. 0 not checked. [2022-11-19 06:40:34,426 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:40:34,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111377972] [2022-11-19 06:40:34,426 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:40:34,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [408337254] [2022-11-19 06:40:34,426 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [408337254] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:40:34,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [709836559] [2022-11-19 06:40:34,428 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 06:40:34,429 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:40:34,429 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:40:34,429 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:40:34,429 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:40:38,473 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-19 06:40:38,525 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:40:38,557 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:40:43,370 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42638#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:40:43,370 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:40:43,371 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:40:43,371 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2022-11-19 06:40:43,371 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485803441] [2022-11-19 06:40:43,371 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:40:43,372 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-19 06:40:43,372 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:40:43,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-19 06:40:43,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1204, Unknown=0, NotChecked=0, Total=1332 [2022-11-19 06:40:43,374 INFO L87 Difference]: Start difference. First operand 2039 states and 2756 transitions. Second operand has 18 states, 18 states have (on average 6.0) internal successors, (108), 18 states have internal predecessors, (108), 18 states have call successors, (33), 2 states have call predecessors, (33), 1 states have return successors, (32), 17 states have call predecessors, (32), 17 states have call successors, (32) [2022-11-19 06:40:47,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:40:47,961 INFO L93 Difference]: Finished difference Result 3587 states and 4919 transitions. [2022-11-19 06:40:47,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-19 06:40:47,961 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 6.0) internal successors, (108), 18 states have internal predecessors, (108), 18 states have call successors, (33), 2 states have call predecessors, (33), 1 states have return successors, (32), 17 states have call predecessors, (32), 17 states have call successors, (32) Word has length 178 [2022-11-19 06:40:47,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:40:47,977 INFO L225 Difference]: With dead ends: 3587 [2022-11-19 06:40:47,977 INFO L226 Difference]: Without dead ends: 3276 [2022-11-19 06:40:47,981 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 566 GetRequests, 495 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1339 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=506, Invalid=4464, Unknown=0, NotChecked=0, Total=4970 [2022-11-19 06:40:47,981 INFO L413 NwaCegarLoop]: 335 mSDtfsCounter, 339 mSDsluCounter, 1264 mSDsCounter, 0 mSdLazyCounter, 1598 mSolverCounterSat, 224 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 347 SdHoareTripleChecker+Valid, 1599 SdHoareTripleChecker+Invalid, 1822 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 224 IncrementalHoareTripleChecker+Valid, 1598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-19 06:40:47,982 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [347 Valid, 1599 Invalid, 1822 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [224 Valid, 1598 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-19 06:40:47,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3276 states. [2022-11-19 06:40:49,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3276 to 2581. [2022-11-19 06:40:49,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2581 states, 1946 states have (on average 1.183967112024666) internal successors, (2304), 1988 states have internal predecessors, (2304), 610 states have call successors, (610), 25 states have call predecessors, (610), 24 states have return successors, (609), 567 states have call predecessors, (609), 609 states have call successors, (609) [2022-11-19 06:40:49,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2581 states to 2581 states and 3523 transitions. [2022-11-19 06:40:49,076 INFO L78 Accepts]: Start accepts. Automaton has 2581 states and 3523 transitions. Word has length 178 [2022-11-19 06:40:49,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:40:49,076 INFO L495 AbstractCegarLoop]: Abstraction has 2581 states and 3523 transitions. [2022-11-19 06:40:49,077 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 6.0) internal successors, (108), 18 states have internal predecessors, (108), 18 states have call successors, (33), 2 states have call predecessors, (33), 1 states have return successors, (32), 17 states have call predecessors, (32), 17 states have call successors, (32) [2022-11-19 06:40:49,077 INFO L276 IsEmpty]: Start isEmpty. Operand 2581 states and 3523 transitions. [2022-11-19 06:40:49,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-19 06:40:49,089 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:40:49,090 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 7, 7, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:40:49,103 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-11-19 06:40:49,297 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:49,297 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:40:49,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:40:49,298 INFO L85 PathProgramCache]: Analyzing trace with hash 2135458502, now seen corresponding path program 9 times [2022-11-19 06:40:49,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:40:49,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43275960] [2022-11-19 06:40:49,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:49,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:40:49,309 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:40:49,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2069395025] [2022-11-19 06:40:49,309 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:40:49,309 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:49,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:40:49,310 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:40:49,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-19 06:40:49,726 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:40:49,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:40:49,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 43 conjunts are in the unsatisfiable core [2022-11-19 06:40:49,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:40:50,293 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 60 proven. 1044 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:40:50,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:40:51,278 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 60 proven. 284 refuted. 0 times theorem prover too weak. 762 trivial. 0 not checked. [2022-11-19 06:40:51,278 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:40:51,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43275960] [2022-11-19 06:40:51,278 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:40:51,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2069395025] [2022-11-19 06:40:51,278 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2069395025] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:40:51,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [743756201] [2022-11-19 06:40:51,280 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 06:40:51,280 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:40:51,281 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:40:51,281 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:40:51,281 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:40:53,722 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-19 06:40:53,769 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:40:53,799 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:40:56,370 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53092#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-19 06:40:56,370 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:40:56,370 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:40:56,371 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24] total 46 [2022-11-19 06:40:56,371 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512980261] [2022-11-19 06:40:56,371 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:40:56,372 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-19 06:40:56,372 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:40:56,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-19 06:40:56,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1242, Invalid=2918, Unknown=0, NotChecked=0, Total=4160 [2022-11-19 06:40:56,375 INFO L87 Difference]: Start difference. First operand 2581 states and 3523 transitions. Second operand has 46 states, 46 states have (on average 4.3478260869565215) internal successors, (200), 46 states have internal predecessors, (200), 43 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 42 states have call successors, (44) [2022-11-19 06:41:04,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:41:04,024 INFO L93 Difference]: Finished difference Result 10562 states and 15878 transitions. [2022-11-19 06:41:04,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-11-19 06:41:04,025 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 4.3478260869565215) internal successors, (200), 46 states have internal predecessors, (200), 43 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 42 states have call successors, (44) Word has length 178 [2022-11-19 06:41:04,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:41:04,071 INFO L225 Difference]: With dead ends: 10562 [2022-11-19 06:41:04,071 INFO L226 Difference]: Without dead ends: 10459 [2022-11-19 06:41:04,079 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 469 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3073 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=2982, Invalid=7938, Unknown=0, NotChecked=0, Total=10920 [2022-11-19 06:41:04,080 INFO L413 NwaCegarLoop]: 144 mSDtfsCounter, 1538 mSDsluCounter, 717 mSDsCounter, 0 mSdLazyCounter, 818 mSolverCounterSat, 821 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1538 SdHoareTripleChecker+Valid, 861 SdHoareTripleChecker+Invalid, 1639 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 821 IncrementalHoareTripleChecker+Valid, 818 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-19 06:41:04,080 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1538 Valid, 861 Invalid, 1639 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [821 Valid, 818 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-19 06:41:04,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10459 states. [2022-11-19 06:41:08,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10459 to 10204. [2022-11-19 06:41:08,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10204 states, 7669 states have (on average 1.2558351805972094) internal successors, (9631), 7732 states have internal predecessors, (9631), 2490 states have call successors, (2490), 45 states have call predecessors, (2490), 44 states have return successors, (2489), 2426 states have call predecessors, (2489), 2489 states have call successors, (2489) [2022-11-19 06:41:08,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10204 states to 10204 states and 14610 transitions. [2022-11-19 06:41:08,071 INFO L78 Accepts]: Start accepts. Automaton has 10204 states and 14610 transitions. Word has length 178 [2022-11-19 06:41:08,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:41:08,071 INFO L495 AbstractCegarLoop]: Abstraction has 10204 states and 14610 transitions. [2022-11-19 06:41:08,072 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 4.3478260869565215) internal successors, (200), 46 states have internal predecessors, (200), 43 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 42 states have call successors, (44) [2022-11-19 06:41:08,072 INFO L276 IsEmpty]: Start isEmpty. Operand 10204 states and 14610 transitions. [2022-11-19 06:41:08,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2022-11-19 06:41:08,085 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:41:08,085 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 10, 10, 10, 10, 8, 7, 7, 7, 6, 5, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:41:08,092 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-19 06:41:08,291 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-19 06:41:08,292 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:41:08,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:41:08,292 INFO L85 PathProgramCache]: Analyzing trace with hash 97743629, now seen corresponding path program 2 times [2022-11-19 06:41:08,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:41:08,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351908040] [2022-11-19 06:41:08,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:08,293 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:41:08,306 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:41:08,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [658661007] [2022-11-19 06:41:08,306 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:41:08,306 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:08,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:41:08,308 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:41:08,330 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-19 06:41:09,599 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-19 06:41:09,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:41:09,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-19 06:41:09,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:41:10,127 INFO L134 CoverageAnalysis]: Checked inductivity of 1194 backedges. 50 proven. 1142 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:41:10,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:41:11,125 INFO L134 CoverageAnalysis]: Checked inductivity of 1194 backedges. 50 proven. 302 refuted. 0 times theorem prover too weak. 842 trivial. 0 not checked. [2022-11-19 06:41:11,125 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:41:11,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351908040] [2022-11-19 06:41:11,125 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:41:11,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [658661007] [2022-11-19 06:41:11,126 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [658661007] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:41:11,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [101574266] [2022-11-19 06:41:11,129 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 06:41:11,129 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:41:11,129 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:41:11,129 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:41:11,129 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:41:15,023 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-19 06:41:15,030 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:41:15,060 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:41:22,719 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '85448#(and (<= ~counter~0 103) (= |__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 [2022-11-19 06:41:22,719 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:41:22,719 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:41:22,719 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25] total 48 [2022-11-19 06:41:22,719 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973073230] [2022-11-19 06:41:22,719 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:41:22,720 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-19 06:41:22,720 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:41:22,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-19 06:41:22,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1336, Invalid=3220, Unknown=0, NotChecked=0, Total=4556 [2022-11-19 06:41:22,723 INFO L87 Difference]: Start difference. First operand 10204 states and 14610 transitions. Second operand has 48 states, 48 states have (on average 4.3125) internal successors, (207), 48 states have internal predecessors, (207), 45 states have call successors, (47), 24 states have call predecessors, (47), 23 states have return successors, (46), 44 states have call predecessors, (46), 44 states have call successors, (46) [2022-11-19 06:41:28,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:41:28,848 INFO L93 Difference]: Finished difference Result 15319 states and 22102 transitions. [2022-11-19 06:41:28,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-11-19 06:41:28,849 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 4.3125) internal successors, (207), 48 states have internal predecessors, (207), 45 states have call successors, (47), 24 states have call predecessors, (47), 23 states have return successors, (46), 44 states have call predecessors, (46), 44 states have call successors, (46) Word has length 184 [2022-11-19 06:41:28,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:41:28,889 INFO L225 Difference]: With dead ends: 15319 [2022-11-19 06:41:28,889 INFO L226 Difference]: Without dead ends: 7786 [2022-11-19 06:41:28,912 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 484 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3286 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=3160, Invalid=8612, Unknown=0, NotChecked=0, Total=11772 [2022-11-19 06:41:28,913 INFO L413 NwaCegarLoop]: 150 mSDtfsCounter, 1771 mSDsluCounter, 832 mSDsCounter, 0 mSdLazyCounter, 814 mSolverCounterSat, 982 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1771 SdHoareTripleChecker+Valid, 982 SdHoareTripleChecker+Invalid, 1796 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 982 IncrementalHoareTripleChecker+Valid, 814 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-19 06:41:28,913 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1771 Valid, 982 Invalid, 1796 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [982 Valid, 814 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-19 06:41:28,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7786 states. [2022-11-19 06:41:32,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7786 to 7555. [2022-11-19 06:41:32,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7555 states, 5667 states have (on average 1.1838715369684136) internal successors, (6709), 5715 states have internal predecessors, (6709), 1841 states have call successors, (1841), 47 states have call predecessors, (1841), 46 states have return successors, (1840), 1792 states have call predecessors, (1840), 1840 states have call successors, (1840) [2022-11-19 06:41:32,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7555 states to 7555 states and 10390 transitions. [2022-11-19 06:41:32,237 INFO L78 Accepts]: Start accepts. Automaton has 7555 states and 10390 transitions. Word has length 184 [2022-11-19 06:41:32,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:41:32,238 INFO L495 AbstractCegarLoop]: Abstraction has 7555 states and 10390 transitions. [2022-11-19 06:41:32,239 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 4.3125) internal successors, (207), 48 states have internal predecessors, (207), 45 states have call successors, (47), 24 states have call predecessors, (47), 23 states have return successors, (46), 44 states have call predecessors, (46), 44 states have call successors, (46) [2022-11-19 06:41:32,239 INFO L276 IsEmpty]: Start isEmpty. Operand 7555 states and 10390 transitions. [2022-11-19 06:41:32,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2022-11-19 06:41:32,251 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:41:32,251 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 22, 10, 10, 10, 10, 8, 8, 8, 8, 6, 5, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:41:32,260 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-19 06:41:32,460 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-19 06:41:32,460 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:41:32,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:41:32,461 INFO L85 PathProgramCache]: Analyzing trace with hash 1898418516, now seen corresponding path program 2 times [2022-11-19 06:41:32,461 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:41:32,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733777589] [2022-11-19 06:41:32,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:32,461 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:41:32,478 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:41:32,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [861757832] [2022-11-19 06:41:32,478 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:41:32,479 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:32,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:41:32,480 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:41:32,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-19 06:41:34,518 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-19 06:41:34,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:41:34,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 47 conjunts are in the unsatisfiable core [2022-11-19 06:41:34,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:41:35,152 INFO L134 CoverageAnalysis]: Checked inductivity of 1294 backedges. 44 proven. 1248 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:41:35,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:41:36,268 INFO L134 CoverageAnalysis]: Checked inductivity of 1294 backedges. 44 proven. 324 refuted. 0 times theorem prover too weak. 926 trivial. 0 not checked. [2022-11-19 06:41:36,268 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:41:36,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733777589] [2022-11-19 06:41:36,269 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:41:36,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861757832] [2022-11-19 06:41:36,269 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861757832] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:41:36,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1609226784] [2022-11-19 06:41:36,271 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 06:41:36,271 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:41:36,271 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:41:36,271 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:41:36,272 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:41:40,249 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-19 06:41:40,253 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:41:40,286 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:41:46,693 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '120993#(and (<= ~counter~0 102) (= |__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 [2022-11-19 06:41:46,693 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:41:46,693 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:41:46,694 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26] total 50 [2022-11-19 06:41:46,694 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183459620] [2022-11-19 06:41:46,694 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:41:46,695 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-19 06:41:46,695 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:41:46,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-19 06:41:46,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1429, Invalid=3263, Unknown=0, NotChecked=0, Total=4692 [2022-11-19 06:41:46,699 INFO L87 Difference]: Start difference. First operand 7555 states and 10390 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, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2022-11-19 06:41:53,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:41:53,410 INFO L93 Difference]: Finished difference Result 8195 states and 11310 transitions. [2022-11-19 06:41:53,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2022-11-19 06:41:53,412 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, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) Word has length 190 [2022-11-19 06:41:53,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:41:53,439 INFO L225 Difference]: With dead ends: 8195 [2022-11-19 06:41:53,440 INFO L226 Difference]: Without dead ends: 8048 [2022-11-19 06:41:53,444 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 610 GetRequests, 497 SyntacticMatches, 4 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3614 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=3342, Invalid=8868, Unknown=0, NotChecked=0, Total=12210 [2022-11-19 06:41:53,445 INFO L413 NwaCegarLoop]: 156 mSDtfsCounter, 2101 mSDsluCounter, 794 mSDsCounter, 0 mSdLazyCounter, 677 mSolverCounterSat, 1506 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2101 SdHoareTripleChecker+Valid, 950 SdHoareTripleChecker+Invalid, 2183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1506 IncrementalHoareTripleChecker+Valid, 677 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-19 06:41:53,445 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2101 Valid, 950 Invalid, 2183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1506 Valid, 677 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-19 06:41:53,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8048 states. [2022-11-19 06:41:56,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8048 to 7339. [2022-11-19 06:41:56,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7339 states, 5514 states have (on average 1.1267682263329706) internal successors, (6213), 5558 states have internal predecessors, (6213), 1776 states have call successors, (1776), 49 states have call predecessors, (1776), 48 states have return successors, (1775), 1731 states have call predecessors, (1775), 1775 states have call successors, (1775) [2022-11-19 06:41:56,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7339 states to 7339 states and 9764 transitions. [2022-11-19 06:41:56,402 INFO L78 Accepts]: Start accepts. Automaton has 7339 states and 9764 transitions. Word has length 190 [2022-11-19 06:41:56,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:41:56,403 INFO L495 AbstractCegarLoop]: Abstraction has 7339 states and 9764 transitions. [2022-11-19 06:41:56,403 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, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2022-11-19 06:41:56,404 INFO L276 IsEmpty]: Start isEmpty. Operand 7339 states and 9764 transitions. [2022-11-19 06:41:56,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-11-19 06:41:56,482 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:41:56,482 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:41:56,497 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-19 06:41:56,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:56,697 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:41:56,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:41:56,698 INFO L85 PathProgramCache]: Analyzing trace with hash 1302721490, now seen corresponding path program 10 times [2022-11-19 06:41:56,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:41:56,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [97140969] [2022-11-19 06:41:56,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:56,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:41:56,718 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:41:56,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1917423299] [2022-11-19 06:41:56,719 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:41:56,719 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:56,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:41:56,720 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:41:56,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-19 06:41:56,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:41:56,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 813 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-19 06:41:56,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:41:57,668 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 416 proven. 1164 refuted. 0 times theorem prover too weak. 3690 trivial. 0 not checked. [2022-11-19 06:41:57,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:41:58,683 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 266 proven. 1204 refuted. 0 times theorem prover too weak. 3800 trivial. 0 not checked. [2022-11-19 06:41:58,683 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:41:58,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [97140969] [2022-11-19 06:41:58,684 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:41:58,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1917423299] [2022-11-19 06:41:58,684 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1917423299] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:41:58,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [366659204] [2022-11-19 06:41:58,686 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 06:41:58,686 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:41:58,687 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:41:58,687 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:41:58,687 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:42:01,032 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-19 06:42:01,081 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:42:01,113 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:42:05,595 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '146596#(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 [2022-11-19 06:42:05,595 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:42:05,595 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:42:05,595 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 32 [2022-11-19 06:42:05,595 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444471556] [2022-11-19 06:42:05,596 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:42:05,596 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-19 06:42:05,597 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:42:05,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-19 06:42:05,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=2365, Unknown=0, NotChecked=0, Total=2550 [2022-11-19 06:42:05,598 INFO L87 Difference]: Start difference. First operand 7339 states and 9764 transitions. Second operand has 32 states, 32 states have (on average 7.34375) internal successors, (235), 32 states have internal predecessors, (235), 32 states have call successors, (75), 2 states have call predecessors, (75), 2 states have return successors, (74), 32 states have call predecessors, (74), 32 states have call successors, (74) [2022-11-19 06:42:13,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:42:13,400 INFO L93 Difference]: Finished difference Result 10729 states and 14284 transitions. [2022-11-19 06:42:13,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-19 06:42:13,401 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 7.34375) internal successors, (235), 32 states have internal predecessors, (235), 32 states have call successors, (75), 2 states have call predecessors, (75), 2 states have return successors, (74), 32 states have call predecessors, (74), 32 states have call successors, (74) Word has length 370 [2022-11-19 06:42:13,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:42:13,432 INFO L225 Difference]: With dead ends: 10729 [2022-11-19 06:42:13,432 INFO L226 Difference]: Without dead ends: 8971 [2022-11-19 06:42:13,439 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1136 GetRequests, 1057 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1405 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=581, Invalid=5581, Unknown=0, NotChecked=0, Total=6162 [2022-11-19 06:42:13,441 INFO L413 NwaCegarLoop]: 303 mSDtfsCounter, 418 mSDsluCounter, 2716 mSDsCounter, 0 mSdLazyCounter, 3291 mSolverCounterSat, 224 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 424 SdHoareTripleChecker+Valid, 3019 SdHoareTripleChecker+Invalid, 3515 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 224 IncrementalHoareTripleChecker+Valid, 3291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-11-19 06:42:13,443 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [424 Valid, 3019 Invalid, 3515 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [224 Valid, 3291 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-11-19 06:42:13,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8971 states. [2022-11-19 06:42:16,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8971 to 7452. [2022-11-19 06:42:16,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7452 states, 5599 states have (on average 1.1269869619574924) internal successors, (6310), 5644 states have internal predecessors, (6310), 1804 states have call successors, (1804), 49 states have call predecessors, (1804), 48 states have return successors, (1803), 1758 states have call predecessors, (1803), 1803 states have call successors, (1803) [2022-11-19 06:42:16,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7452 states to 7452 states and 9917 transitions. [2022-11-19 06:42:16,177 INFO L78 Accepts]: Start accepts. Automaton has 7452 states and 9917 transitions. Word has length 370 [2022-11-19 06:42:16,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:42:16,178 INFO L495 AbstractCegarLoop]: Abstraction has 7452 states and 9917 transitions. [2022-11-19 06:42:16,178 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 7.34375) internal successors, (235), 32 states have internal predecessors, (235), 32 states have call successors, (75), 2 states have call predecessors, (75), 2 states have return successors, (74), 32 states have call predecessors, (74), 32 states have call successors, (74) [2022-11-19 06:42:16,179 INFO L276 IsEmpty]: Start isEmpty. Operand 7452 states and 9917 transitions. [2022-11-19 06:42:16,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-11-19 06:42:16,208 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:42:16,208 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:42:16,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-19 06:42:16,415 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-19 06:42:16,415 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:42:16,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:42:16,415 INFO L85 PathProgramCache]: Analyzing trace with hash -467354670, now seen corresponding path program 11 times [2022-11-19 06:42:16,416 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:42:16,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1797294895] [2022-11-19 06:42:16,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:42:16,416 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:42:16,440 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:42:16,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [760357045] [2022-11-19 06:42:16,441 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:42:16,441 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:42:16,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:42:16,442 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:42:16,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-19 06:42:22,232 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2022-11-19 06:42:22,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:42:22,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 764 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-19 06:42:22,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:42:22,778 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 176 proven. 1280 refuted. 0 times theorem prover too weak. 3814 trivial. 0 not checked. [2022-11-19 06:42:22,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:42:23,726 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 236 proven. 1220 refuted. 0 times theorem prover too weak. 3814 trivial. 0 not checked. [2022-11-19 06:42:23,726 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:42:23,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1797294895] [2022-11-19 06:42:23,726 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:42:23,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760357045] [2022-11-19 06:42:23,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [760357045] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:42:23,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1790895284] [2022-11-19 06:42:23,729 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 06:42:23,729 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:42:23,730 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:42:23,730 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:42:23,730 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:42:27,240 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-19 06:42:27,245 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:42:27,268 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:42:39,867 WARN L233 SmtUtils]: Spent 5.86s on a formula simplification. DAG size of input: 108 DAG size of output: 100 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 06:42:47,000 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '176128#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 104) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:42:47,000 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:42:47,000 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:42:47,000 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 25 [2022-11-19 06:42:47,000 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376597251] [2022-11-19 06:42:47,001 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:42:47,002 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-19 06:42:47,002 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:42:47,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-19 06:42:47,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1991, Unknown=0, NotChecked=0, Total=2162 [2022-11-19 06:42:47,003 INFO L87 Difference]: Start difference. First operand 7452 states and 9917 transitions. Second operand has 25 states, 25 states have (on average 7.36) internal successors, (184), 25 states have internal predecessors, (184), 25 states have call successors, (57), 2 states have call predecessors, (57), 1 states have return successors, (56), 24 states have call predecessors, (56), 24 states have call successors, (56) [2022-11-19 06:42:49,584 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-19 06:43:09,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:43:09,519 INFO L93 Difference]: Finished difference Result 29989 states and 40448 transitions. [2022-11-19 06:43:09,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2022-11-19 06:43:09,520 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 7.36) internal successors, (184), 25 states have internal predecessors, (184), 25 states have call successors, (57), 2 states have call predecessors, (57), 1 states have return successors, (56), 24 states have call predecessors, (56), 24 states have call successors, (56) Word has length 370 [2022-11-19 06:43:09,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:43:09,611 INFO L225 Difference]: With dead ends: 29989 [2022-11-19 06:43:09,611 INFO L226 Difference]: Without dead ends: 28150 [2022-11-19 06:43:09,626 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1209 GetRequests, 1054 SyntacticMatches, 9 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6994 ImplicationChecksByTransitivity, 24.4s TimeCoverageRelationStatistics Valid=1797, Invalid=19959, Unknown=0, NotChecked=0, Total=21756 [2022-11-19 06:43:09,626 INFO L413 NwaCegarLoop]: 588 mSDtfsCounter, 904 mSDsluCounter, 3339 mSDsCounter, 0 mSdLazyCounter, 5469 mSolverCounterSat, 516 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 913 SdHoareTripleChecker+Valid, 3927 SdHoareTripleChecker+Invalid, 5986 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 516 IncrementalHoareTripleChecker+Valid, 5469 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2022-11-19 06:43:09,627 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [913 Valid, 3927 Invalid, 5986 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [516 Valid, 5469 Invalid, 1 Unknown, 0 Unchecked, 6.3s Time] [2022-11-19 06:43:09,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28150 states. [2022-11-19 06:43:18,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28150 to 19145. [2022-11-19 06:43:18,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19145 states, 14375 states have (on average 1.1407304347826086) internal successors, (16398), 14491 states have internal predecessors, (16398), 4721 states have call successors, (4721), 49 states have call predecessors, (4721), 48 states have return successors, (4720), 4604 states have call predecessors, (4720), 4720 states have call successors, (4720) [2022-11-19 06:43:18,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19145 states to 19145 states and 25839 transitions. [2022-11-19 06:43:18,328 INFO L78 Accepts]: Start accepts. Automaton has 19145 states and 25839 transitions. Word has length 370 [2022-11-19 06:43:18,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:43:18,329 INFO L495 AbstractCegarLoop]: Abstraction has 19145 states and 25839 transitions. [2022-11-19 06:43:18,330 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 7.36) internal successors, (184), 25 states have internal predecessors, (184), 25 states have call successors, (57), 2 states have call predecessors, (57), 1 states have return successors, (56), 24 states have call predecessors, (56), 24 states have call successors, (56) [2022-11-19 06:43:18,330 INFO L276 IsEmpty]: Start isEmpty. Operand 19145 states and 25839 transitions. [2022-11-19 06:43:18,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-11-19 06:43:18,385 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:43:18,385 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:43:18,404 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-19 06:43:18,596 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-19 06:43:18,596 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:43:18,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:43:18,596 INFO L85 PathProgramCache]: Analyzing trace with hash -279568430, now seen corresponding path program 12 times [2022-11-19 06:43:18,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:43:18,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2098223970] [2022-11-19 06:43:18,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:43:18,597 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:43:18,616 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:43:18,617 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1329756901] [2022-11-19 06:43:18,617 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:43:18,617 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:43:18,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:43:18,618 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:43:18,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-19 06:43:18,867 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:43:18,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:43:18,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 737 conjuncts, 142 conjunts are in the unsatisfiable core [2022-11-19 06:43:18,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:43:27,683 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 2814 proven. 759 refuted. 0 times theorem prover too weak. 1697 trivial. 0 not checked. [2022-11-19 06:43:27,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:43:30,169 WARN L837 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~v~0#1| Int) (|ULTIMATE.start_main_~r~0#1| Int)) (not (= (+ (* |c_ULTIMATE.start_main_~u~0#1| |c_ULTIMATE.start_main_~u~0#1|) (* 2 |ULTIMATE.start_main_~v~0#1|)) (+ (* |ULTIMATE.start_main_~r~0#1| 4) (* |c_ULTIMATE.start_main_~u~0#1| 2) (* |ULTIMATE.start_main_~v~0#1| |ULTIMATE.start_main_~v~0#1|) (* |c_ULTIMATE.start_main_~A~0#1| 4))))) is different from false [2022-11-19 06:43:30,170 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:43:30,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2098223970] [2022-11-19 06:43:30,170 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:43:30,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1329756901] [2022-11-19 06:43:30,171 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1329756901] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:43:30,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [591051641] [2022-11-19 06:43:30,172 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 06:43:30,172 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:43:30,172 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:43:30,173 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:43:30,173 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:43:33,775 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-19 06:43:33,780 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:43:33,810 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:43:44,100 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '251387#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 104) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:43:44,101 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:43:44,101 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-19 06:43:44,101 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2022-11-19 06:43:44,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873221967] [2022-11-19 06:43:44,102 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-19 06:43:44,102 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-19 06:43:44,103 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:43:44,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-19 06:43:44,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=2082, Unknown=1, NotChecked=92, Total=2352 [2022-11-19 06:43:44,104 INFO L87 Difference]: Start difference. First operand 19145 states and 25839 transitions. Second operand has 22 states, 21 states have (on average 5.523809523809524) internal successors, (116), 19 states have internal predecessors, (116), 16 states have call successors, (35), 2 states have call predecessors, (35), 4 states have return successors, (34), 18 states have call predecessors, (34), 16 states have call successors, (34) [2022-11-19 06:44:02,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:44:02,138 INFO L93 Difference]: Finished difference Result 21874 states and 29417 transitions. [2022-11-19 06:44:02,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-19 06:44:02,139 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 5.523809523809524) internal successors, (116), 19 states have internal predecessors, (116), 16 states have call successors, (35), 2 states have call predecessors, (35), 4 states have return successors, (34), 18 states have call predecessors, (34), 16 states have call successors, (34) Word has length 370 [2022-11-19 06:44:02,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:44:02,199 INFO L225 Difference]: With dead ends: 21874 [2022-11-19 06:44:02,199 INFO L226 Difference]: Without dead ends: 19755 [2022-11-19 06:44:02,209 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 776 GetRequests, 727 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 673 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=184, Invalid=2171, Unknown=1, NotChecked=94, Total=2450 [2022-11-19 06:44:02,210 INFO L413 NwaCegarLoop]: 174 mSDtfsCounter, 125 mSDsluCounter, 1916 mSDsCounter, 0 mSdLazyCounter, 2414 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 2090 SdHoareTripleChecker+Invalid, 2660 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 2414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 184 IncrementalHoareTripleChecker+Unchecked, 10.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:44:02,210 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [140 Valid, 2090 Invalid, 2660 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 2414 Invalid, 0 Unknown, 184 Unchecked, 10.2s Time] [2022-11-19 06:44:02,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19755 states. [2022-11-19 06:44:10,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19755 to 18800. [2022-11-19 06:44:10,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18800 states, 14120 states have (on average 1.1419971671388103) internal successors, (16125), 14235 states have internal predecessors, (16125), 4631 states have call successors, (4631), 49 states have call predecessors, (4631), 48 states have return successors, (4630), 4515 states have call predecessors, (4630), 4630 states have call successors, (4630) [2022-11-19 06:44:10,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18800 states to 18800 states and 25386 transitions. [2022-11-19 06:44:10,078 INFO L78 Accepts]: Start accepts. Automaton has 18800 states and 25386 transitions. Word has length 370 [2022-11-19 06:44:10,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:44:10,079 INFO L495 AbstractCegarLoop]: Abstraction has 18800 states and 25386 transitions. [2022-11-19 06:44:10,079 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 5.523809523809524) internal successors, (116), 19 states have internal predecessors, (116), 16 states have call successors, (35), 2 states have call predecessors, (35), 4 states have return successors, (34), 18 states have call predecessors, (34), 16 states have call successors, (34) [2022-11-19 06:44:10,080 INFO L276 IsEmpty]: Start isEmpty. Operand 18800 states and 25386 transitions. [2022-11-19 06:44:10,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-11-19 06:44:10,128 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:44:10,128 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:44:10,143 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-19 06:44:10,334 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:44:10,335 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:44:10,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:44:10,335 INFO L85 PathProgramCache]: Analyzing trace with hash 407104466, now seen corresponding path program 13 times [2022-11-19 06:44:10,335 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:44:10,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978004601] [2022-11-19 06:44:10,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:44:10,335 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:44:10,366 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:44:10,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [118068465] [2022-11-19 06:44:10,367 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:44:10,367 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:44:10,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:44:10,368 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:44:10,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-19 06:44:10,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:44:10,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 813 conjuncts, 91 conjunts are in the unsatisfiable core [2022-11-19 06:44:10,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:44:12,307 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 138 proven. 5130 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:44:12,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:44:15,419 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 138 proven. 1346 refuted. 0 times theorem prover too weak. 3786 trivial. 0 not checked. [2022-11-19 06:44:15,419 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:44:15,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978004601] [2022-11-19 06:44:15,420 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:44:15,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [118068465] [2022-11-19 06:44:15,420 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [118068465] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:44:15,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [113671693] [2022-11-19 06:44:15,422 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 06:44:15,422 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:44:15,422 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:44:15,423 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:44:15,423 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:44:18,885 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-19 06:44:18,889 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:44:18,914 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:44:28,169 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '314736#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 104) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:44:28,170 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:44:28,170 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:44:28,170 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 48] total 94 [2022-11-19 06:44:28,170 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234696012] [2022-11-19 06:44:28,170 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:44:28,171 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2022-11-19 06:44:28,171 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:44:28,172 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2022-11-19 06:44:28,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4733, Invalid=8607, Unknown=0, NotChecked=0, Total=13340 [2022-11-19 06:44:28,175 INFO L87 Difference]: Start difference. First operand 18800 states and 25386 transitions. Second operand has 94 states, 94 states have (on average 4.425531914893617) internal successors, (416), 94 states have internal predecessors, (416), 91 states have call successors, (93), 47 states have call predecessors, (93), 46 states have return successors, (92), 90 states have call predecessors, (92), 90 states have call successors, (92) [2022-11-19 06:45:05,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:45:05,051 INFO L93 Difference]: Finished difference Result 69221 states and 104680 transitions. [2022-11-19 06:45:05,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 181 states. [2022-11-19 06:45:05,052 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 4.425531914893617) internal successors, (416), 94 states have internal predecessors, (416), 91 states have call successors, (93), 47 states have call predecessors, (93), 46 states have return successors, (92), 90 states have call predecessors, (92), 90 states have call successors, (92) Word has length 370 [2022-11-19 06:45:05,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:45:05,393 INFO L225 Difference]: With dead ends: 69221 [2022-11-19 06:45:05,393 INFO L226 Difference]: Without dead ends: 69102 [2022-11-19 06:45:05,415 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1196 GetRequests, 994 SyntacticMatches, 0 SemanticMatches, 202 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9821 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=12785, Invalid=28627, Unknown=0, NotChecked=0, Total=41412 [2022-11-19 06:45:05,416 INFO L413 NwaCegarLoop]: 288 mSDtfsCounter, 4178 mSDsluCounter, 1763 mSDsCounter, 0 mSdLazyCounter, 1625 mSolverCounterSat, 2604 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4178 SdHoareTripleChecker+Valid, 2051 SdHoareTripleChecker+Invalid, 4229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2604 IncrementalHoareTripleChecker+Valid, 1625 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-11-19 06:45:05,416 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4178 Valid, 2051 Invalid, 4229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2604 Valid, 1625 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-11-19 06:45:05,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69102 states. [2022-11-19 06:45:33,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69102 to 67521. [2022-11-19 06:45:33,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67521 states, 50722 states have (on average 1.2586057332124128) internal successors, (63839), 50890 states have internal predecessors, (63839), 16706 states have call successors, (16706), 93 states have call predecessors, (16706), 92 states have return successors, (16705), 16537 states have call predecessors, (16705), 16705 states have call successors, (16705) [2022-11-19 06:45:34,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67521 states to 67521 states and 97250 transitions. [2022-11-19 06:45:34,040 INFO L78 Accepts]: Start accepts. Automaton has 67521 states and 97250 transitions. Word has length 370 [2022-11-19 06:45:34,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:45:34,040 INFO L495 AbstractCegarLoop]: Abstraction has 67521 states and 97250 transitions. [2022-11-19 06:45:34,041 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 4.425531914893617) internal successors, (416), 94 states have internal predecessors, (416), 91 states have call successors, (93), 47 states have call predecessors, (93), 46 states have return successors, (92), 90 states have call predecessors, (92), 90 states have call successors, (92) [2022-11-19 06:45:34,041 INFO L276 IsEmpty]: Start isEmpty. Operand 67521 states and 97250 transitions. [2022-11-19 06:45:34,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 377 [2022-11-19 06:45:34,095 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:45:34,096 INFO L195 NwaCegarLoop]: trace histogram [46, 45, 45, 19, 19, 19, 19, 18, 17, 17, 17, 10, 10, 9, 9, 9, 9, 9, 9, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:45:34,103 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-19 06:45:34,303 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-19 06:45:34,303 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:45:34,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:45:34,304 INFO L85 PathProgramCache]: Analyzing trace with hash 1001946905, now seen corresponding path program 3 times [2022-11-19 06:45:34,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:45:34,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621215430] [2022-11-19 06:45:34,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:45:34,304 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:45:34,325 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:45:34,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2122691370] [2022-11-19 06:45:34,326 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:45:34,326 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:45:34,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:45:34,335 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:45:34,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_175dacce-f883-4faf-a03b-9c6d2e741585/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-19 06:45:34,603 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:45:34,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:45:34,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 747 conjuncts, 102 conjunts are in the unsatisfiable core [2022-11-19 06:45:34,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:46:23,699 WARN L233 SmtUtils]: Spent 6.05s on a formula simplification that was a NOOP. DAG size: 79 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)