./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 436f0a1b9da8affd8e76edc25dee0cffff5a08ff489ec96067821d6a4548518b --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:36:27,218 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:36:27,220 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:36:27,253 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:36:27,253 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:36:27,255 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:36:27,256 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:36:27,259 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:36:27,261 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:36:27,262 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:36:27,263 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:36:27,265 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:36:27,265 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:36:27,267 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:36:27,268 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:36:27,270 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:36:27,271 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:36:27,272 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:36:27,274 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:36:27,276 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:36:27,278 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:36:27,279 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:36:27,281 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:36:27,282 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:36:27,286 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:36:27,286 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:36:27,286 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:36:27,287 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:36:27,288 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:36:27,289 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:36:27,290 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:36:27,291 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:36:27,292 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:36:27,292 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:36:27,294 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:36:27,294 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:36:27,295 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:36:27,295 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:36:27,297 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:36:27,298 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:36:27,300 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:36:27,301 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:36:27,341 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:36:27,342 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:36:27,342 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:36:27,342 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:36:27,343 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:36:27,343 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:36:27,343 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:36:27,344 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:36:27,344 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:36:27,344 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:36:27,344 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:36:27,345 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:36:27,345 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:36:27,345 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:36:27,345 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:36:27,346 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:36:27,346 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:36:27,346 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:36:27,347 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:36:27,347 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:36:27,347 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:36:27,348 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:36:27,349 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:36:27,349 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:36:27,349 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:36:27,349 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:36:27,351 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:36:27,351 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:36:27,351 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:36:27,352 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:36:27,352 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:36:27,352 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:36:27,353 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:36:27,353 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:36:27,353 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:36:27,353 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:36:27,354 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:36:27,354 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:36:27,354 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:36:27,354 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:36:27,354 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:36:27,355 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 436f0a1b9da8affd8e76edc25dee0cffff5a08ff489ec96067821d6a4548518b [2021-11-20 23:36:27,680 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:36:27,701 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:36:27,703 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:36:27,705 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:36:27,705 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:36:27,707 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c [2021-11-20 23:36:27,780 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/data/40b2fc0ca/a75deedb4c9542f499178f28c1b274ab/FLAG46c3c1bd4 [2021-11-20 23:36:28,276 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:36:28,277 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c [2021-11-20 23:36:28,291 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/data/40b2fc0ca/a75deedb4c9542f499178f28c1b274ab/FLAG46c3c1bd4 [2021-11-20 23:36:28,645 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/data/40b2fc0ca/a75deedb4c9542f499178f28c1b274ab [2021-11-20 23:36:28,648 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:36:28,650 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:36:28,652 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:36:28,652 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:36:28,655 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:36:28,656 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:36:28" (1/1) ... [2021-11-20 23:36:28,657 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c8f0a47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:28, skipping insertion in model container [2021-11-20 23:36:28,658 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:36:28" (1/1) ... [2021-11-20 23:36:28,665 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:36:28,681 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:36:28,872 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c[490,503] [2021-11-20 23:36:28,899 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:36:28,919 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:36:28,935 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c[490,503] [2021-11-20 23:36:28,950 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:36:28,962 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:36:28,962 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:28 WrapperNode [2021-11-20 23:36:28,962 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:36:28,963 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:36:28,964 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:36:28,964 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:36:28,969 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:28" (1/1) ... [2021-11-20 23:36:28,976 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:28" (1/1) ... [2021-11-20 23:36:28,995 INFO L137 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 91 [2021-11-20 23:36:28,996 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:36:28,997 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:36:28,997 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:36:28,997 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:36:29,005 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:28" (1/1) ... [2021-11-20 23:36:29,006 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:28" (1/1) ... [2021-11-20 23:36:29,008 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:28" (1/1) ... [2021-11-20 23:36:29,008 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:28" (1/1) ... [2021-11-20 23:36:29,012 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:28" (1/1) ... [2021-11-20 23:36:29,016 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:28" (1/1) ... [2021-11-20 23:36:29,017 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:28" (1/1) ... [2021-11-20 23:36:29,020 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:36:29,021 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:36:29,021 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:36:29,021 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:36:29,022 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:28" (1/1) ... [2021-11-20 23:36:29,029 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:36:29,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:29,066 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:36:29,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:36:29,115 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:36:29,115 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-20 23:36:29,115 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-20 23:36:29,116 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:36:29,116 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:36:29,116 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:36:29,116 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-20 23:36:29,116 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-20 23:36:29,184 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:36:29,186 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:36:29,326 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:36:29,345 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:36:29,346 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-20 23:36:29,348 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:36:29 BoogieIcfgContainer [2021-11-20 23:36:29,348 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:36:29,350 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:36:29,350 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:36:29,353 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:36:29,354 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:36:28" (1/3) ... [2021-11-20 23:36:29,354 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35b56803 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:36:29, skipping insertion in model container [2021-11-20 23:36:29,355 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:28" (2/3) ... [2021-11-20 23:36:29,355 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35b56803 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:36:29, skipping insertion in model container [2021-11-20 23:36:29,355 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:36:29" (3/3) ... [2021-11-20 23:36:29,356 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd3-ll_unwindbound50.c [2021-11-20 23:36:29,362 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:36:29,362 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:36:29,450 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:36:29,475 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-20 23:36:29,487 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:36:29,517 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 20 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-20 23:36:29,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-20 23:36:29,524 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:29,524 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:29,540 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:29,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:29,550 INFO L85 PathProgramCache]: Analyzing trace with hash 1826888722, now seen corresponding path program 1 times [2021-11-20 23:36:29,560 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:29,561 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460136175] [2021-11-20 23:36:29,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:29,563 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:29,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:29,791 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:36:29,791 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:29,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460136175] [2021-11-20 23:36:29,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1460136175] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:29,793 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:29,793 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:36:29,794 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472601968] [2021-11-20 23:36:29,795 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:29,809 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-20 23:36:29,809 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:29,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-20 23:36:29,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-20 23:36:29,838 INFO L87 Difference]: Start difference. First operand has 30 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 20 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) 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) [2021-11-20 23:36:29,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:29,869 INFO L93 Difference]: Finished difference Result 54 states and 86 transitions. [2021-11-20 23:36:29,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-20 23:36:29,871 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 [2021-11-20 23:36:29,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:29,879 INFO L225 Difference]: With dead ends: 54 [2021-11-20 23:36:29,880 INFO L226 Difference]: Without dead ends: 28 [2021-11-20 23:36:29,883 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-20 23:36:29,887 INFO L933 BasicCegarLoop]: 37 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, 37 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 [2021-11-20 23:36:29,888 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 37 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:36:29,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-20 23:36:29,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-20 23:36:29,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-20 23:36:29,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2021-11-20 23:36:29,928 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 13 [2021-11-20 23:36:29,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:29,930 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2021-11-20 23:36:29,931 INFO L471 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) [2021-11-20 23:36:29,931 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2021-11-20 23:36:29,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-20 23:36:29,932 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:29,933 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:29,933 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:36:29,933 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:29,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:29,935 INFO L85 PathProgramCache]: Analyzing trace with hash -828509657, now seen corresponding path program 1 times [2021-11-20 23:36:29,935 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:29,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126029325] [2021-11-20 23:36:29,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:29,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:29,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:29,998 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:36:29,999 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:29,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126029325] [2021-11-20 23:36:30,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2126029325] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:30,000 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:30,000 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:36:30,000 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102299852] [2021-11-20 23:36:30,001 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:30,002 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:36:30,002 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:30,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:36:30,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:36:30,004 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-20 23:36:30,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:30,032 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2021-11-20 23:36:30,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:36:30,033 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2021-11-20 23:36:30,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:30,034 INFO L225 Difference]: With dead ends: 37 [2021-11-20 23:36:30,034 INFO L226 Difference]: Without dead ends: 30 [2021-11-20 23:36:30,035 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:36:30,037 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 3 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 94 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 [2021-11-20 23:36:30,038 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 94 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:36:30,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-20 23:36:30,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-11-20 23:36:30,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-20 23:36:30,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 40 transitions. [2021-11-20 23:36:30,047 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 40 transitions. Word has length 14 [2021-11-20 23:36:30,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:30,048 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 40 transitions. [2021-11-20 23:36:30,048 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-20 23:36:30,048 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 40 transitions. [2021-11-20 23:36:30,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-20 23:36:30,049 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:30,050 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:30,050 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 23:36:30,050 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:30,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:30,051 INFO L85 PathProgramCache]: Analyzing trace with hash 66369279, now seen corresponding path program 1 times [2021-11-20 23:36:30,052 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:30,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118367959] [2021-11-20 23:36:30,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:30,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:30,068 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:36:30,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [789850036] [2021-11-20 23:36:30,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:30,069 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:30,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:30,071 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:30,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:36:30,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:30,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-20 23:36:30,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:30,240 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:36:30,240 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:36:30,241 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:30,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118367959] [2021-11-20 23:36:30,241 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:36:30,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [789850036] [2021-11-20 23:36:30,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [789850036] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:30,242 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:30,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:36:30,243 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419464986] [2021-11-20 23:36:30,243 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:30,243 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:36:30,244 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:30,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:36:30,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:36:30,245 INFO L87 Difference]: Start difference. First operand 30 states and 40 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-20 23:36:30,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:30,322 INFO L93 Difference]: Finished difference Result 50 states and 68 transitions. [2021-11-20 23:36:30,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:36:30,324 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 15 [2021-11-20 23:36:30,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:30,327 INFO L225 Difference]: With dead ends: 50 [2021-11-20 23:36:30,327 INFO L226 Difference]: Without dead ends: 43 [2021-11-20 23:36:30,328 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:36:30,329 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 44 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:30,330 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 104 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:36:30,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-20 23:36:30,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2021-11-20 23:36:30,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 22 states have internal predecessors, (28), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-20 23:36:30,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 41 transitions. [2021-11-20 23:36:30,353 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 41 transitions. Word has length 15 [2021-11-20 23:36:30,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:30,354 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 41 transitions. [2021-11-20 23:36:30,354 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-20 23:36:30,354 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 41 transitions. [2021-11-20 23:36:30,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-20 23:36:30,356 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:30,357 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:30,392 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:30,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:30,580 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:30,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:30,581 INFO L85 PathProgramCache]: Analyzing trace with hash -1737104877, now seen corresponding path program 1 times [2021-11-20 23:36:30,582 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:30,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1123816116] [2021-11-20 23:36:30,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:30,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:30,607 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:36:30,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [845565313] [2021-11-20 23:36:30,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:30,608 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:30,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:30,612 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:30,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:36:30,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:30,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-20 23:36:30,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:30,825 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:36:30,825 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:36:30,825 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:30,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1123816116] [2021-11-20 23:36:30,826 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:36:30,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [845565313] [2021-11-20 23:36:30,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [845565313] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:30,827 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:30,827 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:36:30,827 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252960900] [2021-11-20 23:36:30,827 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:30,828 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:36:30,828 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:30,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:36:30,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:36:30,829 INFO L87 Difference]: Start difference. First operand 31 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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) [2021-11-20 23:36:30,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:30,882 INFO L93 Difference]: Finished difference Result 55 states and 75 transitions. [2021-11-20 23:36:30,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:36:30,882 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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 20 [2021-11-20 23:36:30,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:30,884 INFO L225 Difference]: With dead ends: 55 [2021-11-20 23:36:30,884 INFO L226 Difference]: Without dead ends: 33 [2021-11-20 23:36:30,886 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:36:30,889 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 2 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:30,891 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 119 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:36:30,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-20 23:36:30,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-11-20 23:36:30,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-20 23:36:30,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2021-11-20 23:36:30,902 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 20 [2021-11-20 23:36:30,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:30,902 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2021-11-20 23:36:30,902 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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) [2021-11-20 23:36:30,902 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2021-11-20 23:36:30,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-20 23:36:30,903 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:30,903 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:30,941 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:31,117 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:31,118 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:31,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:31,119 INFO L85 PathProgramCache]: Analyzing trace with hash 148941760, now seen corresponding path program 1 times [2021-11-20 23:36:31,119 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:31,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54059697] [2021-11-20 23:36:31,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:31,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:31,133 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:36:31,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [147282794] [2021-11-20 23:36:31,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:31,152 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:31,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:31,158 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:31,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:36:31,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:31,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-20 23:36:31,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:31,504 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:36:31,504 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:36:31,505 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:31,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54059697] [2021-11-20 23:36:31,506 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:36:31,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [147282794] [2021-11-20 23:36:31,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [147282794] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:31,508 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:31,508 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-20 23:36:31,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958993900] [2021-11-20 23:36:31,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:31,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 23:36:31,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:31,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 23:36:31,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-20 23:36:31,511 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-20 23:36:31,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:31,596 INFO L93 Difference]: Finished difference Result 51 states and 68 transitions. [2021-11-20 23:36:31,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-20 23:36:31,597 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2021-11-20 23:36:31,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:31,600 INFO L225 Difference]: With dead ends: 51 [2021-11-20 23:36:31,600 INFO L226 Difference]: Without dead ends: 49 [2021-11-20 23:36:31,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-11-20 23:36:31,602 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 43 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:31,603 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 156 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:36:31,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-20 23:36:31,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2021-11-20 23:36:31,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 33 states have (on average 1.3333333333333333) internal successors, (44), 34 states have internal predecessors, (44), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-20 23:36:31,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 65 transitions. [2021-11-20 23:36:31,625 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 65 transitions. Word has length 20 [2021-11-20 23:36:31,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:31,628 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 65 transitions. [2021-11-20 23:36:31,629 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-20 23:36:31,629 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 65 transitions. [2021-11-20 23:36:31,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-20 23:36:31,630 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:31,631 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:31,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:31,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:31,844 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:31,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:31,845 INFO L85 PathProgramCache]: Analyzing trace with hash -1894324762, now seen corresponding path program 1 times [2021-11-20 23:36:31,845 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:31,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997424752] [2021-11-20 23:36:31,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:31,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:31,856 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:36:31,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2124252922] [2021-11-20 23:36:31,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:31,856 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:31,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:31,857 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:31,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:36:31,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:31,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-20 23:36:31,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:31,974 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:36:31,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:32,064 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:36:32,064 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:32,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1997424752] [2021-11-20 23:36:32,065 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:36:32,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2124252922] [2021-11-20 23:36:32,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2124252922] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:32,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [781583910] [2021-11-20 23:36:32,094 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-20 23:36:32,094 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:32,099 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:32,104 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:32,106 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:36,584 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 53 for LOIs [2021-11-20 23:36:36,676 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:38,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [781583910] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:38,298 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:36:38,298 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [5, 6] total 22 [2021-11-20 23:36:38,299 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154648385] [2021-11-20 23:36:38,299 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:38,299 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-20 23:36:38,299 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:38,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-20 23:36:38,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=343, Unknown=0, NotChecked=0, Total=462 [2021-11-20 23:36:38,301 INFO L87 Difference]: Start difference. First operand 48 states and 65 transitions. Second operand has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:36:38,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:38,754 INFO L93 Difference]: Finished difference Result 80 states and 111 transitions. [2021-11-20 23:36:38,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-20 23:36:38,755 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2021-11-20 23:36:38,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:38,757 INFO L225 Difference]: With dead ends: 80 [2021-11-20 23:36:38,757 INFO L226 Difference]: Without dead ends: 58 [2021-11-20 23:36:38,758 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=131, Invalid=375, Unknown=0, NotChecked=0, Total=506 [2021-11-20 23:36:38,759 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 4 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:38,759 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 216 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:36:38,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-20 23:36:38,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2021-11-20 23:36:38,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 41 states have (on average 1.3170731707317074) internal successors, (54), 42 states have internal predecessors, (54), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-20 23:36:38,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 75 transitions. [2021-11-20 23:36:38,771 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 75 transitions. Word has length 21 [2021-11-20 23:36:38,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:38,771 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 75 transitions. [2021-11-20 23:36:38,772 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:36:38,772 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 75 transitions. [2021-11-20 23:36:38,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-20 23:36:38,773 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:38,773 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:38,802 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:38,992 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-20 23:36:38,993 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:38,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:38,993 INFO L85 PathProgramCache]: Analyzing trace with hash -1377591568, now seen corresponding path program 1 times [2021-11-20 23:36:38,993 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:38,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272110114] [2021-11-20 23:36:38,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:38,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:39,009 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:36:39,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1810450302] [2021-11-20 23:36:39,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:39,010 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:39,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:39,011 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:39,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:36:39,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:39,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-20 23:36:39,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:39,354 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:36:39,354 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:36:39,354 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:39,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272110114] [2021-11-20 23:36:39,355 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:36:39,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1810450302] [2021-11-20 23:36:39,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1810450302] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:39,355 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:39,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-20 23:36:39,356 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232279865] [2021-11-20 23:36:39,356 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:39,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-20 23:36:39,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:39,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-20 23:36:39,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-20 23:36:39,357 INFO L87 Difference]: Start difference. First operand 56 states and 75 transitions. Second operand has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 23:36:39,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:39,565 INFO L93 Difference]: Finished difference Result 73 states and 97 transitions. [2021-11-20 23:36:39,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-20 23:36:39,566 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2021-11-20 23:36:39,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:39,567 INFO L225 Difference]: With dead ends: 73 [2021-11-20 23:36:39,567 INFO L226 Difference]: Without dead ends: 71 [2021-11-20 23:36:39,567 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2021-11-20 23:36:39,568 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 95 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:39,568 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 199 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:36:39,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-20 23:36:39,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 60. [2021-11-20 23:36:39,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 44 states have (on average 1.2954545454545454) internal successors, (57), 45 states have internal predecessors, (57), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-20 23:36:39,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 78 transitions. [2021-11-20 23:36:39,581 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 78 transitions. Word has length 25 [2021-11-20 23:36:39,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:39,581 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 78 transitions. [2021-11-20 23:36:39,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 23:36:39,582 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 78 transitions. [2021-11-20 23:36:39,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-20 23:36:39,583 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:39,583 INFO L514 BasicCegarLoop]: 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] [2021-11-20 23:36:39,619 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:39,798 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-20 23:36:39,799 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:39,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:39,799 INFO L85 PathProgramCache]: Analyzing trace with hash 692243834, now seen corresponding path program 1 times [2021-11-20 23:36:39,799 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:39,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1171998737] [2021-11-20 23:36:39,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:39,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:39,807 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:36:39,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [295471158] [2021-11-20 23:36:39,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:39,807 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:39,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:39,808 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:39,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:36:39,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:39,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-20 23:36:39,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:39,938 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:36:39,939 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:36:39,939 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:39,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1171998737] [2021-11-20 23:36:39,940 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:36:39,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [295471158] [2021-11-20 23:36:39,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [295471158] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:39,941 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:39,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:36:39,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20506188] [2021-11-20 23:36:39,941 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:39,943 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 23:36:39,944 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:39,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 23:36:39,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:36:39,945 INFO L87 Difference]: Start difference. First operand 60 states and 78 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 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) [2021-11-20 23:36:39,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:39,984 INFO L93 Difference]: Finished difference Result 105 states and 139 transitions. [2021-11-20 23:36:39,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:36:39,985 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 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 26 [2021-11-20 23:36:39,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:39,987 INFO L225 Difference]: With dead ends: 105 [2021-11-20 23:36:39,988 INFO L226 Difference]: Without dead ends: 64 [2021-11-20 23:36:39,992 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:36:39,993 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 6 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:39,993 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 119 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:36:39,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-20 23:36:40,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2021-11-20 23:36:40,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 46 states have (on average 1.2826086956521738) internal successors, (59), 47 states have internal predecessors, (59), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-20 23:36:40,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 80 transitions. [2021-11-20 23:36:40,017 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 80 transitions. Word has length 26 [2021-11-20 23:36:40,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:40,019 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 80 transitions. [2021-11-20 23:36:40,019 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 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) [2021-11-20 23:36:40,019 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 80 transitions. [2021-11-20 23:36:40,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-20 23:36:40,021 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:40,021 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:40,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:40,221 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:40,222 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:40,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:40,222 INFO L85 PathProgramCache]: Analyzing trace with hash -1856138177, now seen corresponding path program 1 times [2021-11-20 23:36:40,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:40,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60200783] [2021-11-20 23:36:40,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:40,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:40,235 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:36:40,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [167625325] [2021-11-20 23:36:40,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:40,235 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:40,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:40,236 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:40,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:36:40,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:40,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:36:40,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:40,537 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:36:40,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:40,649 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:36:40,650 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:40,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60200783] [2021-11-20 23:36:40,650 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:36:40,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [167625325] [2021-11-20 23:36:40,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [167625325] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:40,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [819474243] [2021-11-20 23:36:40,653 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-20 23:36:40,654 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:40,654 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:40,654 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:40,655 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:45,709 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 44 for LOIs [2021-11-20 23:36:45,822 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 53 for LOIs [2021-11-20 23:36:45,907 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:47,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [819474243] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:47,974 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:36:47,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [9, 6] total 28 [2021-11-20 23:36:47,975 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850021823] [2021-11-20 23:36:47,975 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:47,976 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-20 23:36:47,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:47,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-20 23:36:47,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=648, Unknown=0, NotChecked=0, Total=756 [2021-11-20 23:36:47,977 INFO L87 Difference]: Start difference. First operand 62 states and 80 transitions. Second operand has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:36:48,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:48,735 INFO L93 Difference]: Finished difference Result 110 states and 146 transitions. [2021-11-20 23:36:48,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-20 23:36:48,736 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2021-11-20 23:36:48,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:48,738 INFO L225 Difference]: With dead ends: 110 [2021-11-20 23:36:48,738 INFO L226 Difference]: Without dead ends: 88 [2021-11-20 23:36:48,739 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=119, Invalid=693, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:36:48,739 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 9 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 449 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:48,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 174 Invalid, 458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 449 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:36:48,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-20 23:36:48,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2021-11-20 23:36:48,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 57 states have (on average 1.2280701754385965) internal successors, (70), 60 states have internal predecessors, (70), 19 states have call successors, (19), 7 states have call predecessors, (19), 7 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-20 23:36:48,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 107 transitions. [2021-11-20 23:36:48,755 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 107 transitions. Word has length 27 [2021-11-20 23:36:48,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:48,756 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 107 transitions. [2021-11-20 23:36:48,756 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:36:48,756 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 107 transitions. [2021-11-20 23:36:48,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-20 23:36:48,758 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:48,758 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 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, 1, 1, 1, 1] [2021-11-20 23:36:48,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:48,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:48,984 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:48,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:48,985 INFO L85 PathProgramCache]: Analyzing trace with hash -301475410, now seen corresponding path program 1 times [2021-11-20 23:36:48,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:48,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962761691] [2021-11-20 23:36:48,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:48,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:48,995 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:36:48,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1977698676] [2021-11-20 23:36:48,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:48,996 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:48,996 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:48,997 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:49,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:36:49,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:49,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-20 23:36:49,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:49,174 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-20 23:36:49,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:49,327 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-20 23:36:49,328 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:49,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962761691] [2021-11-20 23:36:49,328 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:36:49,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1977698676] [2021-11-20 23:36:49,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1977698676] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:49,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [858252719] [2021-11-20 23:36:49,333 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-20 23:36:49,333 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:49,334 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:49,334 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:49,334 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:01,920 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2021-11-20 23:37:02,075 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 53 for LOIs [2021-11-20 23:37:02,150 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:03,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [858252719] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:37:03,584 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:37:03,584 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [6, 7] total 29 [2021-11-20 23:37:03,584 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321882901] [2021-11-20 23:37:03,584 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:37:03,585 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-20 23:37:03,585 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:03,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-20 23:37:03,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=607, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:37:03,586 INFO L87 Difference]: Start difference. First operand 84 states and 107 transitions. Second operand has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-20 23:37:04,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:04,109 INFO L93 Difference]: Finished difference Result 154 states and 197 transitions. [2021-11-20 23:37:04,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-20 23:37:04,109 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 47 [2021-11-20 23:37:04,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:04,112 INFO L225 Difference]: With dead ends: 154 [2021-11-20 23:37:04,112 INFO L226 Difference]: Without dead ends: 113 [2021-11-20 23:37:04,113 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 108 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 460 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=216, Invalid=654, Unknown=0, NotChecked=0, Total=870 [2021-11-20 23:37:04,114 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 8 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 392 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:04,114 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 156 Invalid, 398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 392 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:37:04,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-20 23:37:04,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 93. [2021-11-20 23:37:04,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 65 states have (on average 1.2307692307692308) internal successors, (80), 67 states have internal predecessors, (80), 19 states have call successors, (19), 8 states have call predecessors, (19), 8 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-20 23:37:04,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 117 transitions. [2021-11-20 23:37:04,130 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 117 transitions. Word has length 47 [2021-11-20 23:37:04,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:04,131 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 117 transitions. [2021-11-20 23:37:04,131 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-20 23:37:04,131 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 117 transitions. [2021-11-20 23:37:04,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-20 23:37:04,133 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:04,133 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 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, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:04,163 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:04,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-20 23:37:04,344 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:04,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:04,345 INFO L85 PathProgramCache]: Analyzing trace with hash -339484245, now seen corresponding path program 1 times [2021-11-20 23:37:04,345 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:04,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719938851] [2021-11-20 23:37:04,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:04,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:04,366 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:37:04,366 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [99894239] [2021-11-20 23:37:04,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:04,367 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:04,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:04,368 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:04,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 23:37:04,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:04,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-20 23:37:04,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:04,530 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-20 23:37:04,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:04,656 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-20 23:37:04,656 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:04,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719938851] [2021-11-20 23:37:04,656 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:37:04,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [99894239] [2021-11-20 23:37:04,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [99894239] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:04,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [87065401] [2021-11-20 23:37:04,659 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-20 23:37:04,660 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:04,660 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:04,660 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:04,661 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:32,815 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2021-11-20 23:38:44,912 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 18 for LOIs [2021-11-20 23:38:44,983 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 53 for LOIs [2021-11-20 23:38:45,054 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:50,896 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:50,896 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:38:50,897 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-11-20 23:38:50,897 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001853494] [2021-11-20 23:38:50,897 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:50,898 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-20 23:38:50,898 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:50,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-20 23:38:50,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=1112, Unknown=0, NotChecked=0, Total=1332 [2021-11-20 23:38:50,899 INFO L87 Difference]: Start difference. First operand 93 states and 117 transitions. Second operand has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-20 23:38:51,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:51,239 INFO L93 Difference]: Finished difference Result 471 states and 589 transitions. [2021-11-20 23:38:51,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-20 23:38:51,240 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 48 [2021-11-20 23:38:51,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:51,245 INFO L225 Difference]: With dead ends: 471 [2021-11-20 23:38:51,245 INFO L226 Difference]: Without dead ends: 464 [2021-11-20 23:38:51,246 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 666 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=296, Invalid=1596, Unknown=0, NotChecked=0, Total=1892 [2021-11-20 23:38:51,247 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 241 mSDsluCounter, 304 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 364 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:51,248 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [241 Valid, 364 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:38:51,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 464 states. [2021-11-20 23:38:51,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 464 to 364. [2021-11-20 23:38:51,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 364 states, 254 states have (on average 1.2480314960629921) internal successors, (317), 261 states have internal predecessors, (317), 75 states have call successors, (75), 34 states have call predecessors, (75), 34 states have return successors, (70), 68 states have call predecessors, (70), 70 states have call successors, (70) [2021-11-20 23:38:51,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 462 transitions. [2021-11-20 23:38:51,301 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 462 transitions. Word has length 48 [2021-11-20 23:38:51,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:51,302 INFO L470 AbstractCegarLoop]: Abstraction has 364 states and 462 transitions. [2021-11-20 23:38:51,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-20 23:38:51,302 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 462 transitions. [2021-11-20 23:38:51,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-20 23:38:51,305 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:51,305 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 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, 1, 1, 1, 1, 1] [2021-11-20 23:38:51,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:51,528 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-20 23:38:51,528 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:51,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:51,529 INFO L85 PathProgramCache]: Analyzing trace with hash -1953712133, now seen corresponding path program 1 times [2021-11-20 23:38:51,529 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:51,529 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1645727843] [2021-11-20 23:38:51,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:51,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:51,538 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:38:51,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1029477584] [2021-11-20 23:38:51,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:51,538 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:51,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:51,548 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:51,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 23:38:51,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:51,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-20 23:38:51,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:52,172 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 20 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-20 23:38:52,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:53,038 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 9 proven. 17 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-20 23:38:53,038 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:53,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1645727843] [2021-11-20 23:38:53,039 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:38:53,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1029477584] [2021-11-20 23:38:53,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1029477584] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:53,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [713487695] [2021-11-20 23:38:53,046 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-20 23:38:53,046 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:53,047 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:53,047 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:53,047 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:18,887 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2021-11-20 23:40:18,403 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2021-11-20 23:40:18,476 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 53 for LOIs [2021-11-20 23:40:18,547 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:31,170 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:31,170 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:40:31,170 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 21 [2021-11-20 23:40:31,171 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083351980] [2021-11-20 23:40:31,171 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:31,171 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-20 23:40:31,171 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:31,172 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-20 23:40:31,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=1677, Unknown=0, NotChecked=0, Total=1892 [2021-11-20 23:40:31,173 INFO L87 Difference]: Start difference. First operand 364 states and 462 transitions. Second operand has 21 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 19 states have internal predecessors, (49), 8 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-20 23:40:37,811 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 23:40:40,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:40,860 INFO L93 Difference]: Finished difference Result 681 states and 948 transitions. [2021-11-20 23:40:40,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-20 23:40:40,860 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 19 states have internal predecessors, (49), 8 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 6 states have call successors, (10) Word has length 49 [2021-11-20 23:40:40,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:40,867 INFO L225 Difference]: With dead ends: 681 [2021-11-20 23:40:40,868 INFO L226 Difference]: Without dead ends: 674 [2021-11-20 23:40:40,869 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1072 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=432, Invalid=3474, Unknown=0, NotChecked=0, Total=3906 [2021-11-20 23:40:40,870 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 201 mSDsluCounter, 537 mSDsCounter, 0 mSdLazyCounter, 1099 mSolverCounterSat, 261 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 563 SdHoareTripleChecker+Invalid, 1360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 261 IncrementalHoareTripleChecker+Valid, 1099 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:40,870 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [218 Valid, 563 Invalid, 1360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [261 Valid, 1099 Invalid, 0 Unknown, 0 Unchecked, 8.3s Time] [2021-11-20 23:40:40,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 674 states. [2021-11-20 23:40:40,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 674 to 513. [2021-11-20 23:40:40,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 513 states, 362 states have (on average 1.2955801104972375) internal successors, (469), 366 states have internal predecessors, (469), 109 states have call successors, (109), 41 states have call predecessors, (109), 41 states have return successors, (106), 105 states have call predecessors, (106), 106 states have call successors, (106) [2021-11-20 23:40:40,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 513 states to 513 states and 684 transitions. [2021-11-20 23:40:40,982 INFO L78 Accepts]: Start accepts. Automaton has 513 states and 684 transitions. Word has length 49 [2021-11-20 23:40:40,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:40,982 INFO L470 AbstractCegarLoop]: Abstraction has 513 states and 684 transitions. [2021-11-20 23:40:40,983 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 19 states have internal predecessors, (49), 8 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-20 23:40:40,983 INFO L276 IsEmpty]: Start isEmpty. Operand 513 states and 684 transitions. [2021-11-20 23:40:40,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-20 23:40:40,985 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:40,985 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 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, 1] [2021-11-20 23:40:41,013 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 23:40:41,200 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-20 23:40:41,200 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:41,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:41,201 INFO L85 PathProgramCache]: Analyzing trace with hash -324758054, now seen corresponding path program 1 times [2021-11-20 23:40:41,201 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:41,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1351061076] [2021-11-20 23:40:41,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:41,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:41,222 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:40:41,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [728600902] [2021-11-20 23:40:41,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:41,233 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:41,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:41,234 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:41,259 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 23:40:41,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:41,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-20 23:40:41,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:41,392 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-20 23:40:41,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:41,501 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-20 23:40:41,502 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:41,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1351061076] [2021-11-20 23:40:41,502 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:40:41,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [728600902] [2021-11-20 23:40:41,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [728600902] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:41,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [5395788] [2021-11-20 23:40:41,504 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-20 23:40:41,504 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:41,505 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:41,505 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:41,505 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:17,079 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2021-11-20 23:41:17,223 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 53 for LOIs [2021-11-20 23:41:17,298 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:19,214 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:19,214 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:41:19,214 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-20 23:41:19,214 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875001248] [2021-11-20 23:41:19,214 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:19,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-20 23:41:19,215 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:19,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-20 23:41:19,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:41:19,216 INFO L87 Difference]: Start difference. First operand 513 states and 684 transitions. Second operand has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 23:41:19,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:19,384 INFO L93 Difference]: Finished difference Result 566 states and 746 transitions. [2021-11-20 23:41:19,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-20 23:41:19,384 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 50 [2021-11-20 23:41:19,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:19,389 INFO L225 Difference]: With dead ends: 566 [2021-11-20 23:41:19,389 INFO L226 Difference]: Without dead ends: 564 [2021-11-20 23:41:19,390 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 246 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=114, Invalid=816, Unknown=0, NotChecked=0, Total=930 [2021-11-20 23:41:19,391 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 25 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:19,391 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 121 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:41:19,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 564 states. [2021-11-20 23:41:19,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 564 to 559. [2021-11-20 23:41:19,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 559 states, 400 states have (on average 1.2925) internal successors, (517), 406 states have internal predecessors, (517), 111 states have call successors, (111), 47 states have call predecessors, (111), 47 states have return successors, (108), 105 states have call predecessors, (108), 108 states have call successors, (108) [2021-11-20 23:41:19,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 559 states to 559 states and 736 transitions. [2021-11-20 23:41:19,493 INFO L78 Accepts]: Start accepts. Automaton has 559 states and 736 transitions. Word has length 50 [2021-11-20 23:41:19,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:19,494 INFO L470 AbstractCegarLoop]: Abstraction has 559 states and 736 transitions. [2021-11-20 23:41:19,494 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 23:41:19,494 INFO L276 IsEmpty]: Start isEmpty. Operand 559 states and 736 transitions. [2021-11-20 23:41:19,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-20 23:41:19,496 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:19,497 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 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] [2021-11-20 23:41:19,530 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-20 23:41:19,712 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-20 23:41:19,712 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:41:19,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:19,712 INFO L85 PathProgramCache]: Analyzing trace with hash 643822870, now seen corresponding path program 2 times [2021-11-20 23:41:19,712 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:19,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1083272416] [2021-11-20 23:41:19,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:19,713 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:19,721 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:41:19,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [211138980] [2021-11-20 23:41:19,730 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:41:19,730 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:19,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:19,733 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:19,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-20 23:41:19,799 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 23:41:19,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:41:19,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-20 23:41:19,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:20,192 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-20 23:41:20,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:20,491 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-20 23:41:20,492 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:20,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1083272416] [2021-11-20 23:41:20,492 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:41:20,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [211138980] [2021-11-20 23:41:20,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [211138980] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:20,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1012438849] [2021-11-20 23:41:20,495 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-20 23:41:20,495 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:20,495 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:20,496 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:20,496 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:54,620 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2021-11-20 23:41:54,782 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 53 for LOIs [2021-11-20 23:41:54,868 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:57,233 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:57,234 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:41:57,234 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 13 [2021-11-20 23:41:57,234 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753701420] [2021-11-20 23:41:57,234 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:57,235 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-20 23:41:57,235 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:57,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-20 23:41:57,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=923, Unknown=0, NotChecked=0, Total=1056 [2021-11-20 23:41:57,236 INFO L87 Difference]: Start difference. First operand 559 states and 736 transitions. Second operand has 13 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-20 23:41:58,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:58,394 INFO L93 Difference]: Finished difference Result 792 states and 1047 transitions. [2021-11-20 23:41:58,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-20 23:41:58,396 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) Word has length 55 [2021-11-20 23:41:58,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:58,401 INFO L225 Difference]: With dead ends: 792 [2021-11-20 23:41:58,401 INFO L226 Difference]: Without dead ends: 790 [2021-11-20 23:41:58,403 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 131 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=214, Invalid=1426, Unknown=0, NotChecked=0, Total=1640 [2021-11-20 23:41:58,404 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 84 mSDsluCounter, 463 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 502 SdHoareTripleChecker+Invalid, 330 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 53 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:58,404 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 502 Invalid, 330 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 250 Invalid, 0 Unknown, 53 Unchecked, 0.4s Time] [2021-11-20 23:41:58,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 790 states. [2021-11-20 23:41:58,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 790 to 719. [2021-11-20 23:41:58,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 719 states, 519 states have (on average 1.2909441233140655) internal successors, (670), 527 states have internal predecessors, (670), 140 states have call successors, (140), 59 states have call predecessors, (140), 59 states have return successors, (137), 132 states have call predecessors, (137), 137 states have call successors, (137) [2021-11-20 23:41:58,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 719 states to 719 states and 947 transitions. [2021-11-20 23:41:58,532 INFO L78 Accepts]: Start accepts. Automaton has 719 states and 947 transitions. Word has length 55 [2021-11-20 23:41:58,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:58,534 INFO L470 AbstractCegarLoop]: Abstraction has 719 states and 947 transitions. [2021-11-20 23:41:58,534 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-20 23:41:58,534 INFO L276 IsEmpty]: Start isEmpty. Operand 719 states and 947 transitions. [2021-11-20 23:41:58,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-20 23:41:58,536 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:58,536 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 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, 1, 1, 1, 1, 1] [2021-11-20 23:41:58,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-20 23:41:58,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:58,752 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:41:58,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:58,752 INFO L85 PathProgramCache]: Analyzing trace with hash -1947795252, now seen corresponding path program 1 times [2021-11-20 23:41:58,752 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:58,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1762946427] [2021-11-20 23:41:58,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:58,753 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:58,760 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:41:58,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1763742807] [2021-11-20 23:41:58,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:58,760 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:58,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:58,761 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:58,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-20 23:41:58,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:58,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-20 23:41:58,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:58,931 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-20 23:41:58,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:59,101 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-20 23:41:59,102 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:59,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1762946427] [2021-11-20 23:41:59,102 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:41:59,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1763742807] [2021-11-20 23:41:59,102 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1763742807] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:59,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1888281896] [2021-11-20 23:41:59,106 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-20 23:41:59,106 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:59,106 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:59,107 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:59,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:45:45,472 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 15 for LOIs [2021-11-20 23:45:45,538 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 53 for LOIs [2021-11-20 23:45:45,613 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:45:48,046 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:45:48,046 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:45:48,046 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2021-11-20 23:45:48,046 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31805705] [2021-11-20 23:45:48,046 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:45:48,047 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-20 23:45:48,047 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:48,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-20 23:45:48,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1086, Unknown=0, NotChecked=0, Total=1260 [2021-11-20 23:45:48,048 INFO L87 Difference]: Start difference. First operand 719 states and 947 transitions. Second operand has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-20 23:45:48,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:48,477 INFO L93 Difference]: Finished difference Result 1025 states and 1356 transitions. [2021-11-20 23:45:48,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-20 23:45:48,479 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 55 [2021-11-20 23:45:48,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:48,483 INFO L225 Difference]: With dead ends: 1025 [2021-11-20 23:45:48,484 INFO L226 Difference]: Without dead ends: 720 [2021-11-20 23:45:48,487 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 553 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=216, Invalid=1424, Unknown=0, NotChecked=0, Total=1640 [2021-11-20 23:45:48,489 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 152 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:48,490 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 310 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:45:48,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 720 states. [2021-11-20 23:45:48,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 720 to 695. [2021-11-20 23:45:48,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 695 states, 497 states have (on average 1.2494969818913482) internal successors, (621), 503 states have internal predecessors, (621), 138 states have call successors, (138), 59 states have call predecessors, (138), 59 states have return successors, (136), 132 states have call predecessors, (136), 136 states have call successors, (136) [2021-11-20 23:45:48,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 695 states to 695 states and 895 transitions. [2021-11-20 23:45:48,614 INFO L78 Accepts]: Start accepts. Automaton has 695 states and 895 transitions. Word has length 55 [2021-11-20 23:45:48,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:48,614 INFO L470 AbstractCegarLoop]: Abstraction has 695 states and 895 transitions. [2021-11-20 23:45:48,614 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-20 23:45:48,614 INFO L276 IsEmpty]: Start isEmpty. Operand 695 states and 895 transitions. [2021-11-20 23:45:48,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-20 23:45:48,617 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:48,618 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 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] [2021-11-20 23:45:48,652 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-11-20 23:45:48,832 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:48,832 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:48,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:48,833 INFO L85 PathProgramCache]: Analyzing trace with hash -897475049, now seen corresponding path program 1 times [2021-11-20 23:45:48,833 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:48,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690197620] [2021-11-20 23:45:48,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:48,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:48,841 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:45:48,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [690124451] [2021-11-20 23:45:48,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:48,841 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:48,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:48,844 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:45:48,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-20 23:45:48,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:48,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-20 23:45:48,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:45:49,018 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-20 23:45:49,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:45:49,149 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-20 23:45:49,149 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:49,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [690197620] [2021-11-20 23:45:49,149 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:45:49,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [690124451] [2021-11-20 23:45:49,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [690124451] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-20 23:45:49,150 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:45:49,150 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-11-20 23:45:49,150 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972934846] [2021-11-20 23:45:49,150 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:45:49,150 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:45:49,150 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:49,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:45:49,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:45:49,151 INFO L87 Difference]: Start difference. First operand 695 states and 895 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 23:45:49,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:49,297 INFO L93 Difference]: Finished difference Result 736 states and 930 transitions. [2021-11-20 23:45:49,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:45:49,297 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), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 58 [2021-11-20 23:45:49,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:49,302 INFO L225 Difference]: With dead ends: 736 [2021-11-20 23:45:49,303 INFO L226 Difference]: Without dead ends: 734 [2021-11-20 23:45:49,303 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 107 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-20 23:45:49,304 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 12 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:49,304 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 118 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:45:49,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 734 states. [2021-11-20 23:45:49,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 734 to 731. [2021-11-20 23:45:49,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 731 states, 524 states have (on average 1.2328244274809161) internal successors, (646), 530 states have internal predecessors, (646), 138 states have call successors, (138), 68 states have call predecessors, (138), 68 states have return successors, (136), 132 states have call predecessors, (136), 136 states have call successors, (136) [2021-11-20 23:45:49,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 731 states to 731 states and 920 transitions. [2021-11-20 23:45:49,401 INFO L78 Accepts]: Start accepts. Automaton has 731 states and 920 transitions. Word has length 58 [2021-11-20 23:45:49,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:49,401 INFO L470 AbstractCegarLoop]: Abstraction has 731 states and 920 transitions. [2021-11-20 23:45:49,402 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 23:45:49,402 INFO L276 IsEmpty]: Start isEmpty. Operand 731 states and 920 transitions. [2021-11-20 23:45:49,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:45:49,403 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:49,403 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:49,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-20 23:45:49,616 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-20 23:45:49,616 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:49,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:49,617 INFO L85 PathProgramCache]: Analyzing trace with hash 1281872666, now seen corresponding path program 3 times [2021-11-20 23:45:49,617 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:49,617 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572844503] [2021-11-20 23:45:49,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:49,617 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:49,633 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:45:49,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [966394314] [2021-11-20 23:45:49,633 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:45:49,633 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:49,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:49,635 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:45:49,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-20 23:45:49,673 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:45:49,674 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:45:49,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-20 23:45:49,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:45:49,787 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 22 proven. 10 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2021-11-20 23:45:49,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:45:49,910 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 22 proven. 10 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2021-11-20 23:45:49,910 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:49,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1572844503] [2021-11-20 23:45:49,910 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:45:49,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [966394314] [2021-11-20 23:45:49,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [966394314] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:45:49,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1265384762] [2021-11-20 23:45:49,912 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-20 23:45:49,912 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:45:49,913 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:45:49,913 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:45:49,913 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:24,773 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2021-11-20 23:46:24,924 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 53 for LOIs [2021-11-20 23:46:25,002 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:27,014 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:46:27,014 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:46:27,014 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-20 23:46:27,014 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276332216] [2021-11-20 23:46:27,014 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:46:27,015 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-20 23:46:27,015 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:27,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-20 23:46:27,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:46:27,016 INFO L87 Difference]: Start difference. First operand 731 states and 920 transitions. Second operand has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-20 23:46:27,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:27,294 INFO L93 Difference]: Finished difference Result 822 states and 1032 transitions. [2021-11-20 23:46:27,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-20 23:46:27,294 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 60 [2021-11-20 23:46:27,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:27,300 INFO L225 Difference]: With dead ends: 822 [2021-11-20 23:46:27,300 INFO L226 Difference]: Without dead ends: 820 [2021-11-20 23:46:27,301 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 218 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=111, Invalid=819, Unknown=0, NotChecked=0, Total=930 [2021-11-20 23:46:27,302 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 17 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:27,302 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 143 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:46:27,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 820 states. [2021-11-20 23:46:27,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 820 to 767. [2021-11-20 23:46:27,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 767 states, 546 states have (on average 1.2216117216117217) internal successors, (667), 560 states have internal predecessors, (667), 146 states have call successors, (146), 74 states have call predecessors, (146), 74 states have return successors, (144), 132 states have call predecessors, (144), 144 states have call successors, (144) [2021-11-20 23:46:27,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 767 states to 767 states and 957 transitions. [2021-11-20 23:46:27,441 INFO L78 Accepts]: Start accepts. Automaton has 767 states and 957 transitions. Word has length 60 [2021-11-20 23:46:27,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:27,442 INFO L470 AbstractCegarLoop]: Abstraction has 767 states and 957 transitions. [2021-11-20 23:46:27,442 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-20 23:46:27,442 INFO L276 IsEmpty]: Start isEmpty. Operand 767 states and 957 transitions. [2021-11-20 23:46:27,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:46:27,444 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:27,444 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 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] [2021-11-20 23:46:27,479 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-20 23:46:27,670 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-20 23:46:27,670 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:46:27,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:27,670 INFO L85 PathProgramCache]: Analyzing trace with hash 1844245864, now seen corresponding path program 1 times [2021-11-20 23:46:27,671 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:27,671 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1062065268] [2021-11-20 23:46:27,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:27,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:27,682 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:46:27,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [432411616] [2021-11-20 23:46:27,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:27,682 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:27,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:27,684 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:27,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-20 23:46:27,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:27,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-20 23:46:27,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:27,896 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-20 23:46:27,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:28,089 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-20 23:46:28,089 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:28,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1062065268] [2021-11-20 23:46:28,089 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:46:28,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [432411616] [2021-11-20 23:46:28,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [432411616] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:28,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [202317297] [2021-11-20 23:46:28,092 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-20 23:46:28,092 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:28,092 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:28,092 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:28,092 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:39,887 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-20 23:46:43,409 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-20 23:46:50,588 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 18 for LOIs [2021-11-20 23:46:50,659 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 53 for LOIs [2021-11-20 23:46:50,730 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:52,186 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:46:52,186 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:46:52,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 16 [2021-11-20 23:46:52,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880777916] [2021-11-20 23:46:52,186 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:46:52,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-20 23:46:52,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:52,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-20 23:46:52,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=1152, Unknown=0, NotChecked=0, Total=1406 [2021-11-20 23:46:52,189 INFO L87 Difference]: Start difference. First operand 767 states and 957 transitions. Second operand has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-20 23:46:52,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:52,896 INFO L93 Difference]: Finished difference Result 1620 states and 2110 transitions. [2021-11-20 23:46:52,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-20 23:46:52,898 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 60 [2021-11-20 23:46:52,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:52,907 INFO L225 Difference]: With dead ends: 1620 [2021-11-20 23:46:52,907 INFO L226 Difference]: Without dead ends: 1432 [2021-11-20 23:46:52,909 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 768 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=367, Invalid=1795, Unknown=0, NotChecked=0, Total=2162 [2021-11-20 23:46:52,910 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 294 mSDsluCounter, 365 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 294 SdHoareTripleChecker+Valid, 437 SdHoareTripleChecker+Invalid, 383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:52,910 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [294 Valid, 437 Invalid, 383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [148 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:46:52,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1432 states. [2021-11-20 23:46:53,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1432 to 1318. [2021-11-20 23:46:53,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1318 states, 922 states have (on average 1.2125813449023861) internal successors, (1118), 954 states have internal predecessors, (1118), 280 states have call successors, (280), 115 states have call predecessors, (280), 115 states have return successors, (275), 248 states have call predecessors, (275), 275 states have call successors, (275) [2021-11-20 23:46:53,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1318 states to 1318 states and 1673 transitions. [2021-11-20 23:46:53,187 INFO L78 Accepts]: Start accepts. Automaton has 1318 states and 1673 transitions. Word has length 60 [2021-11-20 23:46:53,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:53,187 INFO L470 AbstractCegarLoop]: Abstraction has 1318 states and 1673 transitions. [2021-11-20 23:46:53,187 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-20 23:46:53,188 INFO L276 IsEmpty]: Start isEmpty. Operand 1318 states and 1673 transitions. [2021-11-20 23:46:53,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-20 23:46:53,189 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:53,189 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:46:53,222 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-20 23:46:53,411 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:53,412 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:46:53,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:53,412 INFO L85 PathProgramCache]: Analyzing trace with hash 186118403, now seen corresponding path program 1 times [2021-11-20 23:46:53,412 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:53,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1078809344] [2021-11-20 23:46:53,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:53,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:53,419 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:46:53,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [357322208] [2021-11-20 23:46:53,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:53,419 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:53,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:53,429 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:53,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-20 23:46:53,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:53,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 23:46:53,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:53,759 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 13 proven. 35 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-20 23:46:53,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:53,934 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 32 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-20 23:46:53,934 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:53,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1078809344] [2021-11-20 23:46:53,934 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:46:53,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [357322208] [2021-11-20 23:46:53,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [357322208] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:53,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1092390172] [2021-11-20 23:46:53,936 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-20 23:46:53,936 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:53,936 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:53,937 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:53,937 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:47:21,241 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2021-11-20 23:48:35,986 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2021-11-20 23:48:36,069 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 53 for LOIs [2021-11-20 23:48:36,142 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:48:43,963 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:48:43,963 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:48:43,963 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 14 [2021-11-20 23:48:43,964 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702087891] [2021-11-20 23:48:43,964 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:48:43,964 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-20 23:48:43,964 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:48:43,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-20 23:48:43,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1115, Unknown=0, NotChecked=0, Total=1260 [2021-11-20 23:48:43,965 INFO L87 Difference]: Start difference. First operand 1318 states and 1673 transitions. Second operand has 14 states, 14 states have (on average 4.857142857142857) internal successors, (68), 13 states have internal predecessors, (68), 6 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-20 23:48:44,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:48:44,829 INFO L93 Difference]: Finished difference Result 1707 states and 2247 transitions. [2021-11-20 23:48:44,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-20 23:48:44,830 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.857142857142857) internal successors, (68), 13 states have internal predecessors, (68), 6 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 61 [2021-11-20 23:48:44,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:48:44,840 INFO L225 Difference]: With dead ends: 1707 [2021-11-20 23:48:44,841 INFO L226 Difference]: Without dead ends: 1705 [2021-11-20 23:48:44,842 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 151 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=202, Invalid=1690, Unknown=0, NotChecked=0, Total=1892 [2021-11-20 23:48:44,843 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 104 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 270 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 380 SdHoareTripleChecker+Invalid, 335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 270 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:48:44,843 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 380 Invalid, 335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 270 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:48:44,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1705 states. [2021-11-20 23:48:45,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1705 to 1415. [2021-11-20 23:48:45,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1415 states, 1002 states have (on average 1.215568862275449) internal successors, (1218), 1037 states have internal predecessors, (1218), 287 states have call successors, (287), 125 states have call predecessors, (287), 125 states have return successors, (282), 252 states have call predecessors, (282), 282 states have call successors, (282) [2021-11-20 23:48:45,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1415 states to 1415 states and 1787 transitions. [2021-11-20 23:48:45,123 INFO L78 Accepts]: Start accepts. Automaton has 1415 states and 1787 transitions. Word has length 61 [2021-11-20 23:48:45,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:48:45,124 INFO L470 AbstractCegarLoop]: Abstraction has 1415 states and 1787 transitions. [2021-11-20 23:48:45,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.857142857142857) internal successors, (68), 13 states have internal predecessors, (68), 6 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-20 23:48:45,124 INFO L276 IsEmpty]: Start isEmpty. Operand 1415 states and 1787 transitions. [2021-11-20 23:48:45,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-20 23:48:45,126 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:48:45,126 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:48:45,167 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-11-20 23:48:45,343 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:45,343 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:48:45,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:48:45,344 INFO L85 PathProgramCache]: Analyzing trace with hash 1039137595, now seen corresponding path program 2 times [2021-11-20 23:48:45,344 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:48:45,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [391335459] [2021-11-20 23:48:45,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:48:45,344 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:48:45,350 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:48:45,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1960307057] [2021-11-20 23:48:45,350 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:48:45,351 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:45,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:48:45,352 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:48:45,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-20 23:48:45,389 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:48:45,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:48:45,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-20 23:48:45,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:48:45,489 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 36 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-20 23:48:45,489 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:48:45,489 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:48:45,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [391335459] [2021-11-20 23:48:45,490 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:48:45,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1960307057] [2021-11-20 23:48:45,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1960307057] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:48:45,490 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:48:45,490 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:48:45,490 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245408019] [2021-11-20 23:48:45,490 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:48:45,490 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:48:45,490 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:48:45,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:48:45,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:48:45,491 INFO L87 Difference]: Start difference. First operand 1415 states and 1787 transitions. Second operand has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-20 23:48:45,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:48:45,821 INFO L93 Difference]: Finished difference Result 2022 states and 2659 transitions. [2021-11-20 23:48:45,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:48:45,822 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 61 [2021-11-20 23:48:45,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:48:45,830 INFO L225 Difference]: With dead ends: 2022 [2021-11-20 23:48:45,831 INFO L226 Difference]: Without dead ends: 1414 [2021-11-20 23:48:45,833 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:48:45,835 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 29 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:48:45,836 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 162 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:48:45,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1414 states. [2021-11-20 23:48:46,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1414 to 1197. [2021-11-20 23:48:46,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1197 states, 837 states have (on average 1.2293906810035842) internal successors, (1029), 866 states have internal predecessors, (1029), 252 states have call successors, (252), 107 states have call predecessors, (252), 107 states have return successors, (247), 223 states have call predecessors, (247), 247 states have call successors, (247) [2021-11-20 23:48:46,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1197 states to 1197 states and 1528 transitions. [2021-11-20 23:48:46,096 INFO L78 Accepts]: Start accepts. Automaton has 1197 states and 1528 transitions. Word has length 61 [2021-11-20 23:48:46,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:48:46,097 INFO L470 AbstractCegarLoop]: Abstraction has 1197 states and 1528 transitions. [2021-11-20 23:48:46,097 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-20 23:48:46,097 INFO L276 IsEmpty]: Start isEmpty. Operand 1197 states and 1528 transitions. [2021-11-20 23:48:46,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-20 23:48:46,100 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:48:46,100 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:48:46,142 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-20 23:48:46,316 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:46,316 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:48:46,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:48:46,316 INFO L85 PathProgramCache]: Analyzing trace with hash 1945599548, now seen corresponding path program 3 times [2021-11-20 23:48:46,317 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:48:46,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [798129792] [2021-11-20 23:48:46,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:48:46,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:48:46,322 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:48:46,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [620518943] [2021-11-20 23:48:46,323 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:48:46,323 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:46,323 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:48:46,324 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:48:46,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-20 23:48:46,372 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:48:46,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:48:46,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:48:46,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:48:46,509 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-20 23:48:46,509 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:48:46,509 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:48:46,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [798129792] [2021-11-20 23:48:46,509 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:48:46,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [620518943] [2021-11-20 23:48:46,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [620518943] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:48:46,509 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:48:46,510 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:48:46,510 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907754992] [2021-11-20 23:48:46,510 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:48:46,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:48:46,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:48:46,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:48:46,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:48:46,511 INFO L87 Difference]: Start difference. First operand 1197 states and 1528 transitions. Second operand has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-20 23:48:46,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:48:46,706 INFO L93 Difference]: Finished difference Result 2119 states and 2755 transitions. [2021-11-20 23:48:46,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:48:46,707 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 64 [2021-11-20 23:48:46,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:48:46,712 INFO L225 Difference]: With dead ends: 2119 [2021-11-20 23:48:46,712 INFO L226 Difference]: Without dead ends: 1210 [2021-11-20 23:48:46,715 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:48:46,716 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 11 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:48:46,716 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 102 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:48:46,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1210 states. [2021-11-20 23:48:46,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1210 to 1132. [2021-11-20 23:48:46,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1132 states, 797 states have (on average 1.2409033877038895) internal successors, (989), 807 states have internal predecessors, (989), 243 states have call successors, (243), 91 states have call predecessors, (243), 91 states have return successors, (238), 233 states have call predecessors, (238), 238 states have call successors, (238) [2021-11-20 23:48:46,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1132 states to 1132 states and 1470 transitions. [2021-11-20 23:48:46,934 INFO L78 Accepts]: Start accepts. Automaton has 1132 states and 1470 transitions. Word has length 64 [2021-11-20 23:48:46,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:48:46,934 INFO L470 AbstractCegarLoop]: Abstraction has 1132 states and 1470 transitions. [2021-11-20 23:48:46,934 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-20 23:48:46,934 INFO L276 IsEmpty]: Start isEmpty. Operand 1132 states and 1470 transitions. [2021-11-20 23:48:46,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-20 23:48:46,936 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:48:46,936 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:48:46,974 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-20 23:48:47,160 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:47,160 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:48:47,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:48:47,160 INFO L85 PathProgramCache]: Analyzing trace with hash -1497093235, now seen corresponding path program 4 times [2021-11-20 23:48:47,161 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:48:47,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [290779437] [2021-11-20 23:48:47,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:48:47,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:48:47,168 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:48:47,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [462394992] [2021-11-20 23:48:47,168 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:48:47,168 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:47,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:48:47,169 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:48:47,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50ce9757-7440-4a5f-baf4-f7167174584d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-20 23:48:47,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:48:47,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-20 23:48:47,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:48:47,964 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 8 proven. 52 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-20 23:48:47,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:48:48,519 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 27 proven. 30 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-20 23:48:48,519 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:48:48,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [290779437] [2021-11-20 23:48:48,519 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:48:48,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [462394992] [2021-11-20 23:48:48,520 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [462394992] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:48:48,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [811355925] [2021-11-20 23:48:48,526 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-20 23:48:48,527 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:48:48,527 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:48:48,527 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:48:48,527 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:49:16,238 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse.