./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 aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/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_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V --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-aef121e [2021-11-23 03:13:49,242 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:13:49,245 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:13:49,298 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:13:49,299 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:13:49,303 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:13:49,305 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:13:49,309 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:13:49,312 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:13:49,320 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:13:49,322 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:13:49,324 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:13:49,324 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:13:49,327 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:13:49,329 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:13:49,338 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:13:49,341 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:13:49,342 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:13:49,344 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:13:49,346 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:13:49,348 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:13:49,349 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:13:49,351 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:13:49,351 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:13:49,355 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:13:49,355 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:13:49,356 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:13:49,357 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:13:49,357 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:13:49,358 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:13:49,359 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:13:49,359 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:13:49,360 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:13:49,361 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:13:49,362 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:13:49,362 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:13:49,363 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:13:49,363 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:13:49,363 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:13:49,364 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:13:49,365 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:13:49,365 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:13:49,391 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:13:49,391 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:13:49,391 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:13:49,391 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:13:49,392 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:13:49,392 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:13:49,392 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:13:49,393 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:13:49,393 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:13:49,393 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:13:49,393 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:13:49,393 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:13:49,393 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:13:49,394 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:13:49,394 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:13:49,394 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:13:49,394 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:13:49,394 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:13:49,395 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:13:49,395 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:13:49,396 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:13:49,396 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:13:49,396 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:13:49,396 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:13:49,396 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:13:49,396 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:13:49,397 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:13:49,397 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:13:49,397 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:13:49,397 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:13:49,397 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:13:49,398 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:13:49,398 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:13:49,398 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:13:49,398 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:13:49,398 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:13:49,399 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:13:49,399 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:13:49,399 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:13:49,399 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:13:49,399 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:13:49,400 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_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 436f0a1b9da8affd8e76edc25dee0cffff5a08ff489ec96067821d6a4548518b [2021-11-23 03:13:49,699 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:13:49,733 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:13:49,736 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:13:49,737 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:13:49,738 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:13:49,739 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c [2021-11-23 03:13:49,813 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/data/46c246185/059589a818ec439e9983a9bc1bf0b18f/FLAGd64114546 [2021-11-23 03:13:50,251 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:13:50,255 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c [2021-11-23 03:13:50,267 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/data/46c246185/059589a818ec439e9983a9bc1bf0b18f/FLAGd64114546 [2021-11-23 03:13:50,622 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/data/46c246185/059589a818ec439e9983a9bc1bf0b18f [2021-11-23 03:13:50,624 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:13:50,626 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:13:50,627 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:13:50,628 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:13:50,631 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:13:50,632 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:13:50" (1/1) ... [2021-11-23 03:13:50,633 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3758019d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:13:50, skipping insertion in model container [2021-11-23 03:13:50,633 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:13:50" (1/1) ... [2021-11-23 03:13:50,640 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:13:50,657 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:13:50,852 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_fd020fa7-6144-4c90-93ca-b186d072753e/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c[490,503] [2021-11-23 03:13:50,890 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:13:50,906 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:13:50,918 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_fd020fa7-6144-4c90-93ca-b186d072753e/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c[490,503] [2021-11-23 03:13:50,928 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:13:50,941 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:13:50,941 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:13:50 WrapperNode [2021-11-23 03:13:50,942 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:13:50,943 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:13:50,943 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:13:50,943 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:13:50,953 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:13:50" (1/1) ... [2021-11-23 03:13:50,963 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:13:50" (1/1) ... [2021-11-23 03:13:50,995 INFO L137 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 91 [2021-11-23 03:13:50,996 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:13:50,997 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:13:50,997 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:13:50,997 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:13:51,006 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:13:50" (1/1) ... [2021-11-23 03:13:51,006 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:13:50" (1/1) ... [2021-11-23 03:13:51,021 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:13:50" (1/1) ... [2021-11-23 03:13:51,022 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:13:50" (1/1) ... [2021-11-23 03:13:51,025 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:13:50" (1/1) ... [2021-11-23 03:13:51,033 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:13:50" (1/1) ... [2021-11-23 03:13:51,034 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:13:50" (1/1) ... [2021-11-23 03:13:51,036 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:13:51,037 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:13:51,038 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:13:51,038 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:13:51,039 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:13:50" (1/1) ... [2021-11-23 03:13:51,046 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:13:51,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:13:51,069 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:13:51,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:13:51,113 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:13:51,114 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-23 03:13:51,114 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-23 03:13:51,114 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:13:51,114 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:13:51,115 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:13:51,115 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-23 03:13:51,115 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-23 03:13:51,178 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:13:51,179 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:13:51,321 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:13:51,341 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:13:51,341 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-23 03:13:51,343 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:13:51 BoogieIcfgContainer [2021-11-23 03:13:51,343 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:13:51,345 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:13:51,345 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:13:51,349 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:13:51,349 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:13:50" (1/3) ... [2021-11-23 03:13:51,350 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1095fe93 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:13:51, skipping insertion in model container [2021-11-23 03:13:51,350 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:13:50" (2/3) ... [2021-11-23 03:13:51,351 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1095fe93 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:13:51, skipping insertion in model container [2021-11-23 03:13:51,351 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:13:51" (3/3) ... [2021-11-23 03:13:51,352 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd3-ll_unwindbound50.c [2021-11-23 03:13:51,358 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:13:51,370 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:13:51,464 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:13:51,480 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 [2021-11-23 03:13:51,480 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:13:51,523 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) [2021-11-23 03:13:51,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 03:13:51,528 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:13:51,529 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:13:51,529 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:13:51,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:13:51,539 INFO L85 PathProgramCache]: Analyzing trace with hash 1826888722, now seen corresponding path program 1 times [2021-11-23 03:13:51,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:13:51,550 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575751049] [2021-11-23 03:13:51,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:13:51,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:13:51,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:13:51,769 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:13:51,770 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:13:51,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575751049] [2021-11-23 03:13:51,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1575751049] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:13:51,775 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:13:51,775 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:13:51,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468745522] [2021-11-23 03:13:51,778 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:13:51,782 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 03:13:51,782 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:13:51,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 03:13:51,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 03:13:51,822 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) [2021-11-23 03:13:51,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:13:51,875 INFO L93 Difference]: Finished difference Result 54 states and 86 transitions. [2021-11-23 03:13:51,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 03:13:51,884 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 [2021-11-23 03:13:51,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:13:51,892 INFO L225 Difference]: With dead ends: 54 [2021-11-23 03:13:51,893 INFO L226 Difference]: Without dead ends: 28 [2021-11-23 03:13:51,897 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 [2021-11-23 03:13:51,907 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 [2021-11-23 03:13:51,908 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] [2021-11-23 03:13:51,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-23 03:13:51,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-23 03:13:51,957 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) [2021-11-23 03:13:51,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2021-11-23 03:13:51,960 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 13 [2021-11-23 03:13:51,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:13:51,963 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2021-11-23 03:13:51,963 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) [2021-11-23 03:13:51,963 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2021-11-23 03:13:51,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-23 03:13:51,965 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:13:51,966 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:13:51,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:13:51,967 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:13:51,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:13:51,971 INFO L85 PathProgramCache]: Analyzing trace with hash -828509657, now seen corresponding path program 1 times [2021-11-23 03:13:51,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:13:51,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1195321573] [2021-11-23 03:13:51,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:13:51,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:13:52,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:13:52,088 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:13:52,089 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:13:52,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1195321573] [2021-11-23 03:13:52,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1195321573] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:13:52,090 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:13:52,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:13:52,091 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133359295] [2021-11-23 03:13:52,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:13:52,092 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:13:52,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:13:52,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:13:52,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:13:52,097 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) [2021-11-23 03:13:52,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:13:52,151 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2021-11-23 03:13:52,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:13:52,151 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 [2021-11-23 03:13:52,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:13:52,153 INFO L225 Difference]: With dead ends: 37 [2021-11-23 03:13:52,153 INFO L226 Difference]: Without dead ends: 30 [2021-11-23 03:13:52,154 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 [2021-11-23 03:13:52,155 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 [2021-11-23 03:13:52,156 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] [2021-11-23 03:13:52,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-23 03:13:52,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-11-23 03:13:52,174 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) [2021-11-23 03:13:52,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 40 transitions. [2021-11-23 03:13:52,177 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 40 transitions. Word has length 14 [2021-11-23 03:13:52,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:13:52,179 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 40 transitions. [2021-11-23 03:13:52,180 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) [2021-11-23 03:13:52,180 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 40 transitions. [2021-11-23 03:13:52,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 03:13:52,182 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:13:52,182 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:13:52,183 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:13:52,183 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:13:52,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:13:52,184 INFO L85 PathProgramCache]: Analyzing trace with hash 66369279, now seen corresponding path program 1 times [2021-11-23 03:13:52,184 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:13:52,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1528139807] [2021-11-23 03:13:52,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:13:52,186 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:13:52,202 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:13:52,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1214424301] [2021-11-23 03:13:52,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:13:52,203 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:13:52,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:13:52,205 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:13:52,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:13:52,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:13:52,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 03:13:52,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:13:52,434 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:13:52,434 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:13:52,435 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:13:52,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1528139807] [2021-11-23 03:13:52,435 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:13:52,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1214424301] [2021-11-23 03:13:52,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1214424301] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:13:52,436 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:13:52,436 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:13:52,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041702046] [2021-11-23 03:13:52,437 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:13:52,437 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:13:52,437 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:13:52,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:13:52,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:13:52,439 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) [2021-11-23 03:13:52,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:13:52,539 INFO L93 Difference]: Finished difference Result 50 states and 68 transitions. [2021-11-23 03:13:52,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:13:52,540 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 [2021-11-23 03:13:52,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:13:52,541 INFO L225 Difference]: With dead ends: 50 [2021-11-23 03:13:52,543 INFO L226 Difference]: Without dead ends: 43 [2021-11-23 03:13:52,543 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 [2021-11-23 03:13:52,545 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, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:13:52,548 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 104 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:13:52,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-23 03:13:52,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2021-11-23 03:13:52,558 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) [2021-11-23 03:13:52,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 41 transitions. [2021-11-23 03:13:52,562 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 41 transitions. Word has length 15 [2021-11-23 03:13:52,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:13:52,562 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 41 transitions. [2021-11-23 03:13:52,563 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) [2021-11-23 03:13:52,563 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 41 transitions. [2021-11-23 03:13:52,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-23 03:13:52,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:13:52,565 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:13:52,604 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:13:52,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:13:52,780 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:13:52,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:13:52,781 INFO L85 PathProgramCache]: Analyzing trace with hash -1737104877, now seen corresponding path program 1 times [2021-11-23 03:13:52,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:13:52,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1420470212] [2021-11-23 03:13:52,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:13:52,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:13:52,802 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:13:52,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [726473035] [2021-11-23 03:13:52,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:13:52,806 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:13:52,806 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:13:52,807 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:13:52,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:13:52,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:13:52,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:13:52,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:13:52,988 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:13:52,989 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:13:52,989 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:13:52,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1420470212] [2021-11-23 03:13:52,990 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:13:52,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726473035] [2021-11-23 03:13:52,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [726473035] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:13:52,990 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:13:52,991 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:13:52,991 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174620504] [2021-11-23 03:13:52,991 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:13:52,992 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:13:52,992 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:13:52,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:13:52,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:13:52,993 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) [2021-11-23 03:13:53,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:13:53,036 INFO L93 Difference]: Finished difference Result 55 states and 75 transitions. [2021-11-23 03:13:53,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:13:53,037 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 [2021-11-23 03:13:53,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:13:53,038 INFO L225 Difference]: With dead ends: 55 [2021-11-23 03:13:53,038 INFO L226 Difference]: Without dead ends: 33 [2021-11-23 03:13:53,039 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 [2021-11-23 03:13:53,041 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 [2021-11-23 03:13:53,041 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] [2021-11-23 03:13:53,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-23 03:13:53,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-11-23 03:13:53,049 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) [2021-11-23 03:13:53,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2021-11-23 03:13:53,051 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 20 [2021-11-23 03:13:53,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:13:53,052 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2021-11-23 03:13:53,052 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) [2021-11-23 03:13:53,052 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2021-11-23 03:13:53,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-23 03:13:53,053 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:13:53,054 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:13:53,102 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:13:53,278 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:13:53,279 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:13:53,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:13:53,280 INFO L85 PathProgramCache]: Analyzing trace with hash 148941760, now seen corresponding path program 1 times [2021-11-23 03:13:53,280 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:13:53,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041570891] [2021-11-23 03:13:53,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:13:53,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:13:53,296 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:13:53,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [719436359] [2021-11-23 03:13:53,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:13:53,297 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:13:53,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:13:53,299 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:13:53,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:13:53,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:13:53,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 03:13:53,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:13:53,639 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:13:53,639 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:13:53,639 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:13:53,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041570891] [2021-11-23 03:13:53,639 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:13:53,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [719436359] [2021-11-23 03:13:53,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [719436359] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:13:53,640 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:13:53,640 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 03:13:53,640 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268313314] [2021-11-23 03:13:53,641 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:13:53,641 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:13:53,641 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:13:53,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:13:53,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:13:53,642 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) [2021-11-23 03:13:53,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:13:53,748 INFO L93 Difference]: Finished difference Result 51 states and 68 transitions. [2021-11-23 03:13:53,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 03:13:53,749 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 [2021-11-23 03:13:53,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:13:53,754 INFO L225 Difference]: With dead ends: 51 [2021-11-23 03:13:53,754 INFO L226 Difference]: Without dead ends: 49 [2021-11-23 03:13:53,755 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 [2021-11-23 03:13:53,756 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 43 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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 [2021-11-23 03:13:53,759 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] [2021-11-23 03:13:53,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-23 03:13:53,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2021-11-23 03:13:53,787 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) [2021-11-23 03:13:53,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 65 transitions. [2021-11-23 03:13:53,797 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 65 transitions. Word has length 20 [2021-11-23 03:13:53,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:13:53,798 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 65 transitions. [2021-11-23 03:13:53,798 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) [2021-11-23 03:13:53,798 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 65 transitions. [2021-11-23 03:13:53,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-23 03:13:53,800 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:13:53,800 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:13:53,842 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:13:54,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:13:54,019 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:13:54,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:13:54,019 INFO L85 PathProgramCache]: Analyzing trace with hash -1894324762, now seen corresponding path program 1 times [2021-11-23 03:13:54,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:13:54,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135842930] [2021-11-23 03:13:54,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:13:54,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:13:54,029 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:13:54,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1185322763] [2021-11-23 03:13:54,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:13:54,030 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:13:54,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:13:54,031 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:13:54,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:13:54,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:13:54,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 03:13:54,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:13:54,157 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:13:54,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:13:54,251 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:13:54,251 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:13:54,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135842930] [2021-11-23 03:13:54,251 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:13:54,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1185322763] [2021-11-23 03:13:54,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1185322763] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:13:54,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [71593995] [2021-11-23 03:13:54,273 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 03:13:54,273 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:13:54,278 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:13:54,284 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:13:54,284 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:13:55,215 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2021-11-23 03:13:55,260 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:13:57,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [71593995] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:13:57,990 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:13:57,991 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [5, 6] total 22 [2021-11-23 03:13:57,991 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900026069] [2021-11-23 03:13:57,991 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:13:57,992 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 03:13:57,992 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:13:57,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 03:13:57,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=341, Unknown=0, NotChecked=0, Total=462 [2021-11-23 03:13:57,993 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) [2021-11-23 03:13:58,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:13:58,453 INFO L93 Difference]: Finished difference Result 80 states and 111 transitions. [2021-11-23 03:13:58,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 03:13:58,461 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 [2021-11-23 03:13:58,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:13:58,463 INFO L225 Difference]: With dead ends: 80 [2021-11-23 03:13:58,463 INFO L226 Difference]: Without dead ends: 58 [2021-11-23 03:13:58,464 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=141, Invalid=411, Unknown=0, NotChecked=0, Total=552 [2021-11-23 03:13:58,470 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 5 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 17 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:13:58,471 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 134 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 99 Invalid, 0 Unknown, 17 Unchecked, 0.2s Time] [2021-11-23 03:13:58,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-23 03:13:58,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2021-11-23 03:13:58,493 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) [2021-11-23 03:13:58,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 75 transitions. [2021-11-23 03:13:58,495 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 75 transitions. Word has length 21 [2021-11-23 03:13:58,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:13:58,501 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 75 transitions. [2021-11-23 03:13:58,501 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) [2021-11-23 03:13:58,501 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 75 transitions. [2021-11-23 03:13:58,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 03:13:58,503 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:13:58,503 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] [2021-11-23 03:13:58,524 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:13:58,709 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 03:13:58,709 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:13:58,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:13:58,709 INFO L85 PathProgramCache]: Analyzing trace with hash -1377591568, now seen corresponding path program 1 times [2021-11-23 03:13:58,709 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:13:58,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688468090] [2021-11-23 03:13:58,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:13:58,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:13:58,725 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:13:58,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [563328744] [2021-11-23 03:13:58,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:13:58,725 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:13:58,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:13:58,735 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:13:58,753 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:13:58,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:13:58,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 03:13:58,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:13:59,044 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:13:59,044 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:13:59,045 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:13:59,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688468090] [2021-11-23 03:13:59,045 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:13:59,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [563328744] [2021-11-23 03:13:59,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [563328744] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:13:59,045 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:13:59,045 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-23 03:13:59,046 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668244228] [2021-11-23 03:13:59,046 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:13:59,046 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 03:13:59,046 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:13:59,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 03:13:59,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 03:13:59,047 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) [2021-11-23 03:13:59,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:13:59,301 INFO L93 Difference]: Finished difference Result 73 states and 97 transitions. [2021-11-23 03:13:59,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 03:13:59,301 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 [2021-11-23 03:13:59,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:13:59,302 INFO L225 Difference]: With dead ends: 73 [2021-11-23 03:13:59,303 INFO L226 Difference]: Without dead ends: 71 [2021-11-23 03:13:59,303 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 [2021-11-23 03:13:59,304 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 103 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:13:59,304 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 186 Invalid, 176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:13:59,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-23 03:13:59,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 60. [2021-11-23 03:13:59,319 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) [2021-11-23 03:13:59,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 78 transitions. [2021-11-23 03:13:59,320 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 78 transitions. Word has length 25 [2021-11-23 03:13:59,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:13:59,321 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 78 transitions. [2021-11-23 03:13:59,321 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) [2021-11-23 03:13:59,321 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 78 transitions. [2021-11-23 03:13:59,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 03:13:59,322 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:13:59,323 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] [2021-11-23 03:13:59,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 03:13:59,546 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:13:59,547 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:13:59,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:13:59,547 INFO L85 PathProgramCache]: Analyzing trace with hash 692243834, now seen corresponding path program 1 times [2021-11-23 03:13:59,547 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:13:59,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [181437752] [2021-11-23 03:13:59,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:13:59,548 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:13:59,561 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:13:59,561 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [490673143] [2021-11-23 03:13:59,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:13:59,561 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:13:59,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:13:59,563 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:13:59,581 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:13:59,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:13:59,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 03:13:59,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:13:59,706 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:13:59,706 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:13:59,706 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:13:59,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [181437752] [2021-11-23 03:13:59,708 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:13:59,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [490673143] [2021-11-23 03:13:59,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [490673143] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:13:59,709 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:13:59,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:13:59,710 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [804511562] [2021-11-23 03:13:59,710 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:13:59,711 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:13:59,711 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:13:59,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:13:59,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:13:59,712 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) [2021-11-23 03:13:59,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:13:59,753 INFO L93 Difference]: Finished difference Result 105 states and 139 transitions. [2021-11-23 03:13:59,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:13:59,755 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 [2021-11-23 03:13:59,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:13:59,757 INFO L225 Difference]: With dead ends: 105 [2021-11-23 03:13:59,757 INFO L226 Difference]: Without dead ends: 64 [2021-11-23 03:13:59,757 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 [2021-11-23 03:13:59,758 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 8 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:13:59,758 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 100 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:13:59,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-23 03:13:59,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2021-11-23 03:13:59,769 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) [2021-11-23 03:13:59,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 80 transitions. [2021-11-23 03:13:59,770 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 80 transitions. Word has length 26 [2021-11-23 03:13:59,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:13:59,771 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 80 transitions. [2021-11-23 03:13:59,771 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) [2021-11-23 03:13:59,771 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 80 transitions. [2021-11-23 03:13:59,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-23 03:13:59,772 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:13:59,772 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] [2021-11-23 03:13:59,801 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:13:59,998 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:13:59,998 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:13:59,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:13:59,999 INFO L85 PathProgramCache]: Analyzing trace with hash -1856138177, now seen corresponding path program 1 times [2021-11-23 03:13:59,999 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:13:59,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [679417525] [2021-11-23 03:13:59,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:13:59,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:14:00,017 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:14:00,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [674314938] [2021-11-23 03:14:00,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:00,017 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:00,017 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:14:00,023 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:14:00,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:14:00,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:14:00,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 03:14:00,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:14:00,386 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:14:00,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:14:00,525 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:14:00,525 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:14:00,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [679417525] [2021-11-23 03:14:00,526 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:14:00,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674314938] [2021-11-23 03:14:00,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [674314938] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:14:00,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1776063875] [2021-11-23 03:14:00,541 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 03:14:00,542 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:14:00,542 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:14:00,542 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:14:00,543 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:14:01,840 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 53 for LOIs [2021-11-23 03:14:01,866 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2021-11-23 03:14:01,906 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:14:06,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1776063875] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:14:06,023 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:14:06,023 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [9, 6] total 28 [2021-11-23 03:14:06,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702911963] [2021-11-23 03:14:06,024 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:14:06,024 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-23 03:14:06,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:14:06,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-23 03:14:06,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=649, Unknown=0, NotChecked=0, Total=756 [2021-11-23 03:14:06,025 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) [2021-11-23 03:14:06,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:14:06,855 INFO L93 Difference]: Finished difference Result 110 states and 146 transitions. [2021-11-23 03:14:06,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 03:14:06,857 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 [2021-11-23 03:14:06,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:14:06,858 INFO L225 Difference]: With dead ends: 110 [2021-11-23 03:14:06,858 INFO L226 Difference]: Without dead ends: 88 [2021-11-23 03:14:06,859 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=118, Invalid=752, Unknown=0, NotChecked=0, Total=870 [2021-11-23 03:14:06,860 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 7 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 359 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 434 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 359 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 65 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:14:06,860 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 211 Invalid, 434 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 359 Invalid, 0 Unknown, 65 Unchecked, 0.6s Time] [2021-11-23 03:14:06,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-23 03:14:06,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2021-11-23 03:14:06,892 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) [2021-11-23 03:14:06,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 107 transitions. [2021-11-23 03:14:06,895 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 107 transitions. Word has length 27 [2021-11-23 03:14:06,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:14:06,895 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 107 transitions. [2021-11-23 03:14:06,898 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) [2021-11-23 03:14:06,898 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 107 transitions. [2021-11-23 03:14:06,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 03:14:06,912 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:14:06,912 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] [2021-11-23 03:14:06,954 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 03:14:07,138 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:07,139 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:14:07,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:14:07,139 INFO L85 PathProgramCache]: Analyzing trace with hash -301475410, now seen corresponding path program 1 times [2021-11-23 03:14:07,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:14:07,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824281127] [2021-11-23 03:14:07,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:07,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:14:07,154 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:14:07,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1909570029] [2021-11-23 03:14:07,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:07,154 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:07,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:14:07,158 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:14:07,160 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 03:14:07,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:14:07,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:14:07,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:14:07,328 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 03:14:07,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:14:07,483 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 03:14:07,483 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:14:07,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824281127] [2021-11-23 03:14:07,484 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:14:07,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909570029] [2021-11-23 03:14:07,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909570029] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:14:07,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [308046460] [2021-11-23 03:14:07,487 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-23 03:14:07,487 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:14:07,488 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:14:07,488 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:14:07,488 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:14:17,202 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2021-11-23 03:14:17,226 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2021-11-23 03:14:17,262 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:14:21,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [308046460] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:14:21,478 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:14:21,478 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [6, 7] total 29 [2021-11-23 03:14:21,479 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432427624] [2021-11-23 03:14:21,479 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:14:21,479 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-23 03:14:21,479 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:14:21,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-23 03:14:21,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=607, Unknown=0, NotChecked=0, Total=812 [2021-11-23 03:14:21,481 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) [2021-11-23 03:14:22,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:14:22,045 INFO L93 Difference]: Finished difference Result 154 states and 197 transitions. [2021-11-23 03:14:22,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 03:14:22,046 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 [2021-11-23 03:14:22,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:14:22,048 INFO L225 Difference]: With dead ends: 154 [2021-11-23 03:14:22,048 INFO L226 Difference]: Without dead ends: 113 [2021-11-23 03:14:22,049 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 100 SyntacticMatches, 12 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=216, Invalid=654, Unknown=0, NotChecked=0, Total=870 [2021-11-23 03:14:22,050 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 8 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 363 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 32 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:14:22,050 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 181 Invalid, 363 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 325 Invalid, 0 Unknown, 32 Unchecked, 0.4s Time] [2021-11-23 03:14:22,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-23 03:14:22,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 93. [2021-11-23 03:14:22,069 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) [2021-11-23 03:14:22,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 117 transitions. [2021-11-23 03:14:22,070 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 117 transitions. Word has length 47 [2021-11-23 03:14:22,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:14:22,071 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 117 transitions. [2021-11-23 03:14:22,071 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) [2021-11-23 03:14:22,071 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 117 transitions. [2021-11-23 03:14:22,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 03:14:22,072 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:14:22,072 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] [2021-11-23 03:14:22,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 03:14:22,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:22,291 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:14:22,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:14:22,291 INFO L85 PathProgramCache]: Analyzing trace with hash -339484245, now seen corresponding path program 1 times [2021-11-23 03:14:22,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:14:22,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192628584] [2021-11-23 03:14:22,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:22,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:14:22,314 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:14:22,314 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [778939464] [2021-11-23 03:14:22,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:22,315 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:22,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:14:22,315 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:14:22,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 03:14:22,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:14:22,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 03:14:22,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:14:22,486 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 03:14:22,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:14:22,638 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 03:14:22,638 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:14:22,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192628584] [2021-11-23 03:14:22,638 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:14:22,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [778939464] [2021-11-23 03:14:22,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [778939464] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:14:22,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [279736185] [2021-11-23 03:14:22,642 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-23 03:14:22,642 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:14:22,643 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:14:22,643 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:14:22,643 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:14:29,359 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2021-11-23 03:14:29,360 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 17 iterations. Over-approximation may be very coarse. [2021-11-23 03:14:34,791 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-23 03:14:34,800 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2021-11-23 03:14:34,832 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:14:51,121 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3159#(and (<= ~counter~0 52) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2021-11-23 03:14:51,121 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:14:51,121 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:14:51,122 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-11-23 03:14:51,122 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440121932] [2021-11-23 03:14:51,122 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:14:51,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 03:14:51,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:14:51,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 03:14:51,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=1106, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 03:14:51,124 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) [2021-11-23 03:14:51,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:14:51,481 INFO L93 Difference]: Finished difference Result 471 states and 589 transitions. [2021-11-23 03:14:51,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 03:14:51,482 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 [2021-11-23 03:14:51,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:14:51,487 INFO L225 Difference]: With dead ends: 471 [2021-11-23 03:14:51,487 INFO L226 Difference]: Without dead ends: 464 [2021-11-23 03:14:51,488 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 714 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=302, Invalid=1590, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 03:14:51,489 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 225 mSDsluCounter, 304 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 364 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:14:51,489 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [225 Valid, 364 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 145 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:14:51,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 464 states. [2021-11-23 03:14:51,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 464 to 364. [2021-11-23 03:14:51,546 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) [2021-11-23 03:14:51,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 462 transitions. [2021-11-23 03:14:51,550 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 462 transitions. Word has length 48 [2021-11-23 03:14:51,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:14:51,550 INFO L470 AbstractCegarLoop]: Abstraction has 364 states and 462 transitions. [2021-11-23 03:14:51,551 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) [2021-11-23 03:14:51,551 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 462 transitions. [2021-11-23 03:14:51,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 03:14:51,552 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:14:51,553 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] [2021-11-23 03:14:51,586 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 03:14:51,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:51,773 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:14:51,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:14:51,774 INFO L85 PathProgramCache]: Analyzing trace with hash -1953712133, now seen corresponding path program 1 times [2021-11-23 03:14:51,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:14:51,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044905313] [2021-11-23 03:14:51,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:51,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:14:51,784 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:14:51,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [538728430] [2021-11-23 03:14:51,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:51,784 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:51,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:14:51,785 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:14:51,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 03:14:51,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:14:51,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-23 03:14:51,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:14:52,511 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 20 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 03:14:52,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:14:53,377 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 9 proven. 17 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 03:14:53,378 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:14:53,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044905313] [2021-11-23 03:14:53,378 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:14:53,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [538728430] [2021-11-23 03:14:53,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [538728430] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:14:53,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [925083073] [2021-11-23 03:14:53,381 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-23 03:14:53,381 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:14:53,382 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:14:53,382 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:14:53,382 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:14:59,571 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2021-11-23 03:14:59,574 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 17 iterations. Over-approximation may be very coarse. [2021-11-23 03:15:03,207 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2021-11-23 03:15:03,220 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2021-11-23 03:15:03,262 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:15:31,018 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4688#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:15:31,018 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:15:31,018 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:15:31,018 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 21 [2021-11-23 03:15:31,018 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294091400] [2021-11-23 03:15:31,019 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:15:31,019 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-23 03:15:31,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:31,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-23 03:15:31,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=1669, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 03:15:31,021 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) [2021-11-23 03:15:36,535 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:15:40,330 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:15:43,907 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.48s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:15:44,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:44,536 INFO L93 Difference]: Finished difference Result 724 states and 1019 transitions. [2021-11-23 03:15:44,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 03:15:44,538 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 [2021-11-23 03:15:44,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:44,544 INFO L225 Difference]: With dead ends: 724 [2021-11-23 03:15:44,545 INFO L226 Difference]: Without dead ends: 717 [2021-11-23 03:15:44,546 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 99 SyntacticMatches, 4 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1199 ImplicationChecksByTransitivity, 29.7s TimeCoverageRelationStatistics Valid=471, Invalid=3689, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 03:15:44,547 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 257 mSDsluCounter, 446 mSDsCounter, 0 mSdLazyCounter, 1187 mSolverCounterSat, 293 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 282 SdHoareTripleChecker+Valid, 476 SdHoareTripleChecker+Invalid, 1482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 293 IncrementalHoareTripleChecker+Valid, 1187 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:44,547 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [282 Valid, 476 Invalid, 1482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [293 Valid, 1187 Invalid, 2 Unknown, 0 Unchecked, 11.8s Time] [2021-11-23 03:15:44,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 717 states. [2021-11-23 03:15:44,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 717 to 501. [2021-11-23 03:15:44,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 501 states, 354 states have (on average 1.2881355932203389) internal successors, (456), 359 states have internal predecessors, (456), 105 states have call successors, (105), 41 states have call predecessors, (105), 41 states have return successors, (102), 100 states have call predecessors, (102), 102 states have call successors, (102) [2021-11-23 03:15:44,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 663 transitions. [2021-11-23 03:15:44,652 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 663 transitions. Word has length 49 [2021-11-23 03:15:44,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:44,652 INFO L470 AbstractCegarLoop]: Abstraction has 501 states and 663 transitions. [2021-11-23 03:15:44,653 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) [2021-11-23 03:15:44,653 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 663 transitions. [2021-11-23 03:15:44,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 03:15:44,654 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:44,654 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] [2021-11-23 03:15:44,688 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 03:15:44,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:44,877 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:44,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:44,878 INFO L85 PathProgramCache]: Analyzing trace with hash -324758054, now seen corresponding path program 1 times [2021-11-23 03:15:44,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:44,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831194364] [2021-11-23 03:15:44,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:44,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:44,888 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:15:44,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1417339961] [2021-11-23 03:15:44,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:44,888 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:44,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:15:44,891 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:15:44,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 03:15:44,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:44,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 03:15:44,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:15:45,065 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 03:15:45,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:15:45,175 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 03:15:45,175 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:45,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831194364] [2021-11-23 03:15:45,175 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:15:45,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1417339961] [2021-11-23 03:15:45,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1417339961] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:15:45,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [94280159] [2021-11-23 03:15:45,178 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-23 03:15:45,178 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:15:45,179 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:15:45,179 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:15:45,179 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:15:57,031 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2021-11-23 03:15:57,043 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2021-11-23 03:15:57,070 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:16:01,008 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6821#(and (<= 0 |#NULL.base|) (<= ~counter~0 51) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0))' at error location [2021-11-23 03:16:01,008 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:16:01,009 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:16:01,009 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-23 03:16:01,009 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890849629] [2021-11-23 03:16:01,009 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:16:01,009 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 03:16:01,009 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:16:01,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 03:16:01,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=870, Unknown=0, NotChecked=0, Total=992 [2021-11-23 03:16:01,010 INFO L87 Difference]: Start difference. First operand 501 states and 663 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) [2021-11-23 03:16:01,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:16:01,163 INFO L93 Difference]: Finished difference Result 546 states and 716 transitions. [2021-11-23 03:16:01,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:16:01,163 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 [2021-11-23 03:16:01,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:16:01,167 INFO L225 Difference]: With dead ends: 546 [2021-11-23 03:16:01,168 INFO L226 Difference]: Without dead ends: 544 [2021-11-23 03:16:01,169 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 286 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=138, Invalid=984, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 03:16:01,169 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 31 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:16:01,170 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 101 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:16:01,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2021-11-23 03:16:01,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 539. [2021-11-23 03:16:01,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 385 states have (on average 1.2857142857142858) internal successors, (495), 392 states have internal predecessors, (495), 107 states have call successors, (107), 46 states have call predecessors, (107), 46 states have return successors, (104), 100 states have call predecessors, (104), 104 states have call successors, (104) [2021-11-23 03:16:01,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 706 transitions. [2021-11-23 03:16:01,260 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 706 transitions. Word has length 50 [2021-11-23 03:16:01,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:16:01,261 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 706 transitions. [2021-11-23 03:16:01,261 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) [2021-11-23 03:16:01,261 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 706 transitions. [2021-11-23 03:16:01,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 03:16:01,263 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:16:01,263 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] [2021-11-23 03:16:01,299 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 03:16:01,482 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 03:16:01,483 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:16:01,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:16:01,483 INFO L85 PathProgramCache]: Analyzing trace with hash 643822870, now seen corresponding path program 2 times [2021-11-23 03:16:01,483 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:16:01,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1919763572] [2021-11-23 03:16:01,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:16:01,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:16:01,491 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:16:01,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1197886792] [2021-11-23 03:16:01,492 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:16:01,492 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:16:01,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:16:01,493 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:16:01,534 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 03:16:01,573 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 03:16:01,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:16:01,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 03:16:01,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:16:01,974 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 03:16:01,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:16:02,210 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 03:16:02,211 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:16:02,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1919763572] [2021-11-23 03:16:02,211 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:16:02,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1197886792] [2021-11-23 03:16:02,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1197886792] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:16:02,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1183311557] [2021-11-23 03:16:02,214 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-23 03:16:02,214 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:16:02,215 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:16:02,215 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:16:02,215 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:16:13,118 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2021-11-23 03:16:13,130 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2021-11-23 03:16:13,152 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:16:17,112 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8720#(and (<= 0 |#NULL.base|) (<= ~counter~0 51) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0))' at error location [2021-11-23 03:16:17,112 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:16:17,112 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:16:17,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 13 [2021-11-23 03:16:17,113 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147616716] [2021-11-23 03:16:17,113 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:16:17,113 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 03:16:17,113 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:16:17,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 03:16:17,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=1105, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 03:16:17,114 INFO L87 Difference]: Start difference. First operand 539 states and 706 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) [2021-11-23 03:16:17,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:16:17,867 INFO L93 Difference]: Finished difference Result 775 states and 1036 transitions. [2021-11-23 03:16:17,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 03:16:17,869 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 [2021-11-23 03:16:17,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:16:17,876 INFO L225 Difference]: With dead ends: 775 [2021-11-23 03:16:17,876 INFO L226 Difference]: Without dead ends: 773 [2021-11-23 03:16:17,878 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 128 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 514 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=247, Invalid=1733, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 03:16:17,879 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 175 mSDsluCounter, 400 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 447 SdHoareTripleChecker+Invalid, 338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 66 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:16:17,879 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [180 Valid, 447 Invalid, 338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 223 Invalid, 0 Unknown, 66 Unchecked, 0.3s Time] [2021-11-23 03:16:17,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 773 states. [2021-11-23 03:16:18,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 773 to 716. [2021-11-23 03:16:18,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 716 states, 514 states have (on average 1.3035019455252919) internal successors, (670), 521 states have internal predecessors, (670), 144 states have call successors, (144), 57 states have call predecessors, (144), 57 states have return successors, (141), 137 states have call predecessors, (141), 141 states have call successors, (141) [2021-11-23 03:16:18,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 716 states to 716 states and 955 transitions. [2021-11-23 03:16:18,027 INFO L78 Accepts]: Start accepts. Automaton has 716 states and 955 transitions. Word has length 55 [2021-11-23 03:16:18,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:16:18,028 INFO L470 AbstractCegarLoop]: Abstraction has 716 states and 955 transitions. [2021-11-23 03:16:18,028 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) [2021-11-23 03:16:18,029 INFO L276 IsEmpty]: Start isEmpty. Operand 716 states and 955 transitions. [2021-11-23 03:16:18,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 03:16:18,031 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:16:18,031 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] [2021-11-23 03:16:18,072 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 03:16:18,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:16:18,247 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:16:18,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:16:18,247 INFO L85 PathProgramCache]: Analyzing trace with hash -1947795252, now seen corresponding path program 1 times [2021-11-23 03:16:18,247 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:16:18,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [24508892] [2021-11-23 03:16:18,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:16:18,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:16:18,256 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:16:18,256 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [468335826] [2021-11-23 03:16:18,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:16:18,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:16:18,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:16:18,258 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:16:18,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 03:16:18,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:16:18,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:16:18,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:16:18,427 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 03:16:18,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:16:18,546 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 03:16:18,546 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:16:18,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [24508892] [2021-11-23 03:16:18,546 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:16:18,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [468335826] [2021-11-23 03:16:18,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [468335826] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:16:18,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [122454112] [2021-11-23 03:16:18,549 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-23 03:16:18,549 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:16:18,550 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:16:18,550 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:16:18,550 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:16:42,399 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2021-11-23 03:16:42,466 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2021-11-23 03:16:42,490 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:16:46,283 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11211#(and (<= ~counter~0 51) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2021-11-23 03:16:46,283 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:16:46,283 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:16:46,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2021-11-23 03:16:46,284 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481406813] [2021-11-23 03:16:46,284 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:16:46,285 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 03:16:46,285 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:16:46,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 03:16:46,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=1082, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 03:16:46,286 INFO L87 Difference]: Start difference. First operand 716 states and 955 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) [2021-11-23 03:16:46,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:16:46,746 INFO L93 Difference]: Finished difference Result 1024 states and 1369 transitions. [2021-11-23 03:16:46,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 03:16:46,747 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 [2021-11-23 03:16:46,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:16:46,752 INFO L225 Difference]: With dead ends: 1024 [2021-11-23 03:16:46,752 INFO L226 Difference]: Without dead ends: 704 [2021-11-23 03:16:46,757 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 542 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=220, Invalid=1420, Unknown=0, NotChecked=0, Total=1640 [2021-11-23 03:16:46,758 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 152 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:16:46,760 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 230 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:16:46,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 704 states. [2021-11-23 03:16:46,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 704 to 653. [2021-11-23 03:16:46,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 653 states, 469 states have (on average 1.255863539445629) internal successors, (589), 475 states have internal predecessors, (589), 129 states have call successors, (129), 54 states have call predecessors, (129), 54 states have return successors, (127), 123 states have call predecessors, (127), 127 states have call successors, (127) [2021-11-23 03:16:46,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 653 states to 653 states and 845 transitions. [2021-11-23 03:16:46,887 INFO L78 Accepts]: Start accepts. Automaton has 653 states and 845 transitions. Word has length 55 [2021-11-23 03:16:46,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:16:46,888 INFO L470 AbstractCegarLoop]: Abstraction has 653 states and 845 transitions. [2021-11-23 03:16:46,888 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) [2021-11-23 03:16:46,888 INFO L276 IsEmpty]: Start isEmpty. Operand 653 states and 845 transitions. [2021-11-23 03:16:46,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-23 03:16:46,890 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:16:46,890 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] [2021-11-23 03:16:46,926 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 03:16:47,110 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 03:16:47,111 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:16:47,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:16:47,111 INFO L85 PathProgramCache]: Analyzing trace with hash -897475049, now seen corresponding path program 1 times [2021-11-23 03:16:47,111 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:16:47,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076894141] [2021-11-23 03:16:47,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:16:47,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:16:47,123 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:16:47,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [962148061] [2021-11-23 03:16:47,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:16:47,133 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:16:47,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:16:47,134 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:16:47,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 03:16:47,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:16:47,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 03:16:47,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:16:47,402 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-23 03:16:47,402 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:16:47,565 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-23 03:16:47,566 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:16:47,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076894141] [2021-11-23 03:16:47,566 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:16:47,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [962148061] [2021-11-23 03:16:47,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [962148061] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 03:16:47,566 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:16:47,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-11-23 03:16:47,567 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356916914] [2021-11-23 03:16:47,567 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:16:47,567 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:16:47,567 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:16:47,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:16:47,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:16:47,568 INFO L87 Difference]: Start difference. First operand 653 states and 845 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) [2021-11-23 03:16:47,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:16:47,744 INFO L93 Difference]: Finished difference Result 695 states and 881 transitions. [2021-11-23 03:16:47,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:16:47,745 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 [2021-11-23 03:16:47,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:16:47,750 INFO L225 Difference]: With dead ends: 695 [2021-11-23 03:16:47,751 INFO L226 Difference]: Without dead ends: 693 [2021-11-23 03:16:47,752 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 [2021-11-23 03:16:47,753 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 [2021-11-23 03:16:47,753 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] [2021-11-23 03:16:47,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 693 states. [2021-11-23 03:16:47,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 693 to 689. [2021-11-23 03:16:47,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 689 states, 496 states have (on average 1.2379032258064515) internal successors, (614), 502 states have internal predecessors, (614), 129 states have call successors, (129), 63 states have call predecessors, (129), 63 states have return successors, (127), 123 states have call predecessors, (127), 127 states have call successors, (127) [2021-11-23 03:16:47,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 689 states to 689 states and 870 transitions. [2021-11-23 03:16:47,882 INFO L78 Accepts]: Start accepts. Automaton has 689 states and 870 transitions. Word has length 58 [2021-11-23 03:16:47,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:16:47,882 INFO L470 AbstractCegarLoop]: Abstraction has 689 states and 870 transitions. [2021-11-23 03:16:47,882 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) [2021-11-23 03:16:47,883 INFO L276 IsEmpty]: Start isEmpty. Operand 689 states and 870 transitions. [2021-11-23 03:16:47,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 03:16:47,884 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:16:47,884 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] [2021-11-23 03:16:47,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 03:16:48,097 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 03:16:48,097 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:16:48,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:16:48,098 INFO L85 PathProgramCache]: Analyzing trace with hash 1281872666, now seen corresponding path program 3 times [2021-11-23 03:16:48,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:16:48,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603588920] [2021-11-23 03:16:48,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:16:48,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:16:48,108 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:16:48,121 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1180458028] [2021-11-23 03:16:48,121 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:16:48,121 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:16:48,121 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:16:48,122 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:16:48,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 03:16:48,171 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:16:48,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:16:48,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 03:16:48,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:16:48,294 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 22 proven. 10 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2021-11-23 03:16:48,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:16:48,436 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 22 proven. 10 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2021-11-23 03:16:48,436 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:16:48,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603588920] [2021-11-23 03:16:48,437 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:16:48,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1180458028] [2021-11-23 03:16:48,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1180458028] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:16:48,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1081240027] [2021-11-23 03:16:48,445 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-23 03:16:48,445 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:16:48,446 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:16:48,446 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:16:48,446 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:16:59,758 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2021-11-23 03:16:59,771 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2021-11-23 03:16:59,795 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:17:03,181 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16279#(and (<= 0 |#NULL.base|) (<= ~counter~0 51) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0))' at error location [2021-11-23 03:17:03,181 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:17:03,182 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:17:03,182 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-23 03:17:03,182 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970678115] [2021-11-23 03:17:03,182 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:17:03,182 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 03:17:03,182 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:17:03,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 03:17:03,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=873, Unknown=0, NotChecked=0, Total=992 [2021-11-23 03:17:03,183 INFO L87 Difference]: Start difference. First operand 689 states and 870 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) [2021-11-23 03:17:03,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:17:03,419 INFO L93 Difference]: Finished difference Result 773 states and 977 transitions. [2021-11-23 03:17:03,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:17:03,419 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 [2021-11-23 03:17:03,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:17:03,426 INFO L225 Difference]: With dead ends: 773 [2021-11-23 03:17:03,426 INFO L226 Difference]: Without dead ends: 771 [2021-11-23 03:17:03,427 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=135, Invalid=987, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 03:17:03,428 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 17 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:17:03,429 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 126 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:17:03,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 771 states. [2021-11-23 03:17:03,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 771 to 741. [2021-11-23 03:17:03,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 741 states, 525 states have (on average 1.2304761904761905) internal successors, (646), 538 states have internal predecessors, (646), 146 states have call successors, (146), 69 states have call predecessors, (146), 69 states have return successors, (144), 133 states have call predecessors, (144), 144 states have call successors, (144) [2021-11-23 03:17:03,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 741 states to 741 states and 936 transitions. [2021-11-23 03:17:03,595 INFO L78 Accepts]: Start accepts. Automaton has 741 states and 936 transitions. Word has length 60 [2021-11-23 03:17:03,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:17:03,595 INFO L470 AbstractCegarLoop]: Abstraction has 741 states and 936 transitions. [2021-11-23 03:17:03,596 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) [2021-11-23 03:17:03,596 INFO L276 IsEmpty]: Start isEmpty. Operand 741 states and 936 transitions. [2021-11-23 03:17:03,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-23 03:17:03,598 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:17:03,598 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 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] [2021-11-23 03:17:03,638 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 03:17:03,814 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 03:17:03,815 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:17:03,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:17:03,815 INFO L85 PathProgramCache]: Analyzing trace with hash 681284844, now seen corresponding path program 1 times [2021-11-23 03:17:03,815 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:17:03,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599855228] [2021-11-23 03:17:03,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:17:03,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:17:03,825 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:17:03,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1979718973] [2021-11-23 03:17:03,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:17:03,826 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:17:03,826 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:17:03,827 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:17:03,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 03:17:03,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:17:03,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-23 03:17:03,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:17:04,516 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 10 proven. 16 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 03:17:04,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:17:05,401 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 10 proven. 16 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 03:17:05,401 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:17:05,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599855228] [2021-11-23 03:17:05,401 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:17:05,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1979718973] [2021-11-23 03:17:05,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1979718973] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:17:05,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [307477966] [2021-11-23 03:17:05,403 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-23 03:17:05,403 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:17:05,404 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:17:05,404 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:17:05,404 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:17:10,597 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2021-11-23 03:17:10,597 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 17 iterations. Over-approximation may be very coarse. [2021-11-23 03:17:15,347 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-23 03:17:15,355 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2021-11-23 03:17:15,391 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:17:43,116 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18817#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2021-11-23 03:17:43,116 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:17:43,116 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:17:43,116 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2021-11-23 03:17:43,116 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603545378] [2021-11-23 03:17:43,116 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:17:43,117 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 03:17:43,117 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:17:43,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 03:17:43,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1246, Unknown=0, NotChecked=0, Total=1406 [2021-11-23 03:17:43,118 INFO L87 Difference]: Start difference. First operand 741 states and 936 transitions. Second operand has 16 states, 16 states have (on average 3.375) internal successors, (54), 15 states have internal predecessors, (54), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2021-11-23 03:17:53,200 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:17:55,205 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:17:58,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:17:58,194 INFO L93 Difference]: Finished difference Result 1273 states and 1667 transitions. [2021-11-23 03:17:58,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 03:17:58,203 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.375) internal successors, (54), 15 states have internal predecessors, (54), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 59 [2021-11-23 03:17:58,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:17:58,208 INFO L225 Difference]: With dead ends: 1273 [2021-11-23 03:17:58,208 INFO L226 Difference]: Without dead ends: 916 [2021-11-23 03:17:58,211 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 136 SyntacticMatches, 3 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 795 ImplicationChecksByTransitivity, 34.9s TimeCoverageRelationStatistics Valid=426, Invalid=2880, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 03:17:58,212 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 144 mSDsluCounter, 638 mSDsCounter, 0 mSdLazyCounter, 657 mSolverCounterSat, 192 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 706 SdHoareTripleChecker+Invalid, 851 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 192 IncrementalHoareTripleChecker+Valid, 657 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:17:58,212 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [144 Valid, 706 Invalid, 851 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [192 Valid, 657 Invalid, 2 Unknown, 0 Unchecked, 8.3s Time] [2021-11-23 03:17:58,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 916 states. [2021-11-23 03:17:58,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 916 to 825. [2021-11-23 03:17:58,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 825 states, 590 states have (on average 1.2576271186440677) internal successors, (742), 606 states have internal predecessors, (742), 165 states have call successors, (165), 69 states have call predecessors, (165), 69 states have return successors, (163), 149 states have call predecessors, (163), 163 states have call successors, (163) [2021-11-23 03:17:58,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 825 states to 825 states and 1070 transitions. [2021-11-23 03:17:58,412 INFO L78 Accepts]: Start accepts. Automaton has 825 states and 1070 transitions. Word has length 59 [2021-11-23 03:17:58,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:17:58,413 INFO L470 AbstractCegarLoop]: Abstraction has 825 states and 1070 transitions. [2021-11-23 03:17:58,413 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.375) internal successors, (54), 15 states have internal predecessors, (54), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2021-11-23 03:17:58,413 INFO L276 IsEmpty]: Start isEmpty. Operand 825 states and 1070 transitions. [2021-11-23 03:17:58,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 03:17:58,416 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:17:58,416 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] [2021-11-23 03:17:58,451 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 03:17:58,630 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 03:17:58,631 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:17:58,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:17:58,631 INFO L85 PathProgramCache]: Analyzing trace with hash 1844245864, now seen corresponding path program 1 times [2021-11-23 03:17:58,631 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:17:58,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [166071623] [2021-11-23 03:17:58,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:17:58,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:17:58,640 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:17:58,646 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1807231974] [2021-11-23 03:17:58,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:17:58,647 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:17:58,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:17:58,648 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:17:58,670 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 03:17:58,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:17:58,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 03:17:58,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:17:58,849 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 03:17:58,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:17:59,027 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 03:17:59,027 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:17:59,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [166071623] [2021-11-23 03:17:59,027 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:17:59,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1807231974] [2021-11-23 03:17:59,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1807231974] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:17:59,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [8625508] [2021-11-23 03:17:59,029 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-23 03:17:59,029 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:17:59,030 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:17:59,030 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:17:59,030 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:18:02,663 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2021-11-23 03:18:09,438 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-23 03:18:09,447 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2021-11-23 03:18:09,473 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:18:22,723 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22235#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2021-11-23 03:18:22,723 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:18:22,724 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:18:22,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 16 [2021-11-23 03:18:22,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999552558] [2021-11-23 03:18:22,724 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:18:22,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 03:18:22,724 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:18:22,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 03:18:22,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=1136, Unknown=0, NotChecked=0, Total=1406 [2021-11-23 03:18:22,726 INFO L87 Difference]: Start difference. First operand 825 states and 1070 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) [2021-11-23 03:18:23,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:18:23,318 INFO L93 Difference]: Finished difference Result 1945 states and 2657 transitions. [2021-11-23 03:18:23,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 03:18:23,319 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 [2021-11-23 03:18:23,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:18:23,329 INFO L225 Difference]: With dead ends: 1945 [2021-11-23 03:18:23,329 INFO L226 Difference]: Without dead ends: 1660 [2021-11-23 03:18:23,332 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 140 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 870 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=383, Invalid=1779, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 03:18:23,333 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 233 mSDsluCounter, 303 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 374 SdHoareTripleChecker+Invalid, 319 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:18:23,333 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [233 Valid, 374 Invalid, 319 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:18:23,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1660 states. [2021-11-23 03:18:23,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1660 to 1534. [2021-11-23 03:18:23,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1534 states, 1069 states have (on average 1.2478952291861554) internal successors, (1334), 1108 states have internal predecessors, (1334), 353 states have call successors, (353), 111 states have call predecessors, (353), 111 states have return successors, (348), 314 states have call predecessors, (348), 348 states have call successors, (348) [2021-11-23 03:18:23,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1534 states to 1534 states and 2035 transitions. [2021-11-23 03:18:23,742 INFO L78 Accepts]: Start accepts. Automaton has 1534 states and 2035 transitions. Word has length 60 [2021-11-23 03:18:23,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:18:23,743 INFO L470 AbstractCegarLoop]: Abstraction has 1534 states and 2035 transitions. [2021-11-23 03:18:23,743 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) [2021-11-23 03:18:23,743 INFO L276 IsEmpty]: Start isEmpty. Operand 1534 states and 2035 transitions. [2021-11-23 03:18:23,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 03:18:23,746 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:18:23,746 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] [2021-11-23 03:18:23,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 03:18:23,961 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:18:23,961 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:18:23,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:18:23,962 INFO L85 PathProgramCache]: Analyzing trace with hash 186118403, now seen corresponding path program 2 times [2021-11-23 03:18:23,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:18:23,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1054436825] [2021-11-23 03:18:23,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:18:23,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:18:23,969 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:18:23,970 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [306877517] [2021-11-23 03:18:23,970 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:18:23,970 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:18:23,970 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:18:23,974 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:18:23,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 03:18:24,043 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 03:18:24,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:18:24,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-23 03:18:24,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:18:24,501 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 8 proven. 31 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 03:18:24,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:18:24,670 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 8 proven. 25 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:18:24,670 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:18:24,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1054436825] [2021-11-23 03:18:24,670 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:18:24,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [306877517] [2021-11-23 03:18:24,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [306877517] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:18:24,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1161523025] [2021-11-23 03:18:24,672 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-23 03:18:24,672 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:18:24,673 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:18:24,673 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:18:24,673 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:18:30,321 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2021-11-23 03:18:30,330 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2021-11-23 03:18:30,357 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:18:32,654 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27681#(and (<= 0 |#NULL.base|) (<= ~counter~0 51) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|))' at error location [2021-11-23 03:18:32,654 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:18:32,655 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:18:32,655 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 14 [2021-11-23 03:18:32,655 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101311518] [2021-11-23 03:18:32,655 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:18:32,655 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 03:18:32,655 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:18:32,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 03:18:32,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1036, Unknown=0, NotChecked=0, Total=1190 [2021-11-23 03:18:32,657 INFO L87 Difference]: Start difference. First operand 1534 states and 2035 transitions. Second operand has 14 states, 14 states have (on average 4.571428571428571) internal successors, (64), 13 states have internal predecessors, (64), 5 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:18:35,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:18:35,026 INFO L93 Difference]: Finished difference Result 2211 states and 3080 transitions. [2021-11-23 03:18:35,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 03:18:35,027 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.571428571428571) internal successors, (64), 13 states have internal predecessors, (64), 5 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 61 [2021-11-23 03:18:35,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:18:35,042 INFO L225 Difference]: With dead ends: 2211 [2021-11-23 03:18:35,042 INFO L226 Difference]: Without dead ends: 2209 [2021-11-23 03:18:35,044 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 141 SyntacticMatches, 7 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 611 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=257, Invalid=1905, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 03:18:35,048 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 175 mSDsluCounter, 529 mSDsCounter, 0 mSdLazyCounter, 641 mSolverCounterSat, 164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 187 SdHoareTripleChecker+Valid, 610 SdHoareTripleChecker+Invalid, 805 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 164 IncrementalHoareTripleChecker+Valid, 641 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:18:35,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [187 Valid, 610 Invalid, 805 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [164 Valid, 641 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-23 03:18:35,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2209 states. [2021-11-23 03:18:35,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2209 to 1890. [2021-11-23 03:18:35,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1890 states, 1300 states have (on average 1.2784615384615385) internal successors, (1662), 1344 states have internal predecessors, (1662), 464 states have call successors, (464), 125 states have call predecessors, (464), 125 states have return successors, (459), 420 states have call predecessors, (459), 459 states have call successors, (459) [2021-11-23 03:18:35,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1890 states to 1890 states and 2585 transitions. [2021-11-23 03:18:35,505 INFO L78 Accepts]: Start accepts. Automaton has 1890 states and 2585 transitions. Word has length 61 [2021-11-23 03:18:35,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:18:35,506 INFO L470 AbstractCegarLoop]: Abstraction has 1890 states and 2585 transitions. [2021-11-23 03:18:35,506 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.571428571428571) internal successors, (64), 13 states have internal predecessors, (64), 5 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:18:35,506 INFO L276 IsEmpty]: Start isEmpty. Operand 1890 states and 2585 transitions. [2021-11-23 03:18:35,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 03:18:35,508 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:18:35,509 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] [2021-11-23 03:18:35,542 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 03:18:35,722 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:18:35,723 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:18:35,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:18:35,723 INFO L85 PathProgramCache]: Analyzing trace with hash 1039137595, now seen corresponding path program 3 times [2021-11-23 03:18:35,723 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:18:35,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575063910] [2021-11-23 03:18:35,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:18:35,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:18:35,729 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:18:35,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1118188812] [2021-11-23 03:18:35,730 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:18:35,730 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:18:35,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:18:35,732 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:18:35,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 03:18:35,777 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:18:35,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:18:35,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 03:18:35,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:18:35,910 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 36 proven. 3 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 03:18:35,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:18:36,050 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 36 proven. 3 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 03:18:36,051 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:18:36,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575063910] [2021-11-23 03:18:36,051 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:18:36,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1118188812] [2021-11-23 03:18:36,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1118188812] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:18:36,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1087652009] [2021-11-23 03:18:36,053 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-23 03:18:36,054 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:18:36,054 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:18:36,054 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:18:36,054 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:18:41,140 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2021-11-23 03:18:44,704 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-23 03:18:44,712 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2021-11-23 03:18:44,738 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:19:01,345 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34110#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2021-11-23 03:19:01,346 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:19:01,346 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:19:01,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-11-23 03:19:01,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398197367] [2021-11-23 03:19:01,346 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:19:01,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 03:19:01,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:19:01,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 03:19:01,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=965, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 03:19:01,348 INFO L87 Difference]: Start difference. First operand 1890 states and 2585 transitions. Second operand has 12 states, 12 states have (on average 4.416666666666667) internal successors, (53), 12 states have internal predecessors, (53), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:19:02,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:19:02,303 INFO L93 Difference]: Finished difference Result 3091 states and 4290 transitions. [2021-11-23 03:19:02,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 03:19:02,304 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.416666666666667) internal successors, (53), 12 states have internal predecessors, (53), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 61 [2021-11-23 03:19:02,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:19:02,314 INFO L225 Difference]: With dead ends: 3091 [2021-11-23 03:19:02,314 INFO L226 Difference]: Without dead ends: 1840 [2021-11-23 03:19:02,320 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 153 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 17.0s TimeCoverageRelationStatistics Valid=309, Invalid=2141, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 03:19:02,321 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 97 mSDsluCounter, 310 mSDsCounter, 0 mSdLazyCounter, 294 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 368 SdHoareTripleChecker+Invalid, 358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:19:02,321 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 368 Invalid, 358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 294 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:19:02,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1840 states. [2021-11-23 03:19:02,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1840 to 1435. [2021-11-23 03:19:02,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1435 states, 1023 states have (on average 1.2531769305962854) internal successors, (1282), 1035 states have internal predecessors, (1282), 306 states have call successors, (306), 105 states have call predecessors, (306), 105 states have return successors, (301), 294 states have call predecessors, (301), 301 states have call successors, (301) [2021-11-23 03:19:02,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1435 states to 1435 states and 1889 transitions. [2021-11-23 03:19:02,675 INFO L78 Accepts]: Start accepts. Automaton has 1435 states and 1889 transitions. Word has length 61 [2021-11-23 03:19:02,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:19:02,676 INFO L470 AbstractCegarLoop]: Abstraction has 1435 states and 1889 transitions. [2021-11-23 03:19:02,676 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.416666666666667) internal successors, (53), 12 states have internal predecessors, (53), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:19:02,676 INFO L276 IsEmpty]: Start isEmpty. Operand 1435 states and 1889 transitions. [2021-11-23 03:19:02,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 03:19:02,678 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:19:02,678 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:19:02,715 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 03:19:02,898 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-23 03:19:02,899 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:19:02,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:19:02,899 INFO L85 PathProgramCache]: Analyzing trace with hash 1524056252, now seen corresponding path program 1 times [2021-11-23 03:19:02,899 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:19:02,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1403833495] [2021-11-23 03:19:02,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:19:02,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:19:02,907 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:19:02,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [636130925] [2021-11-23 03:19:02,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:19:02,908 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:19:02,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:19:02,909 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:19:02,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 03:19:02,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:19:02,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 03:19:02,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:19:03,121 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 29 proven. 30 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 03:19:03,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:19:03,337 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 29 proven. 30 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 03:19:03,337 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:19:03,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1403833495] [2021-11-23 03:19:03,338 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:19:03,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [636130925] [2021-11-23 03:19:03,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [636130925] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:19:03,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1833799662] [2021-11-23 03:19:03,340 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-23 03:19:03,340 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:19:03,340 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:19:03,340 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:19:03,341 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:19:09,428 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2021-11-23 03:19:09,436 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2021-11-23 03:19:09,495 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:19:11,102 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41115#(and (<= ~counter~0 52) (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|))' at error location [2021-11-23 03:19:11,102 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:19:11,102 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:19:11,102 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 22 [2021-11-23 03:19:11,103 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767839384] [2021-11-23 03:19:11,103 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:19:11,103 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 03:19:11,103 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:19:11,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 03:19:11,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=415, Invalid=1565, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 03:19:11,105 INFO L87 Difference]: Start difference. First operand 1435 states and 1889 transitions. Second operand has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 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) [2021-11-23 03:19:12,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:19:12,616 INFO L93 Difference]: Finished difference Result 3816 states and 5305 transitions. [2021-11-23 03:19:12,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-23 03:19:12,617 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 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 68 [2021-11-23 03:19:12,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:19:12,639 INFO L225 Difference]: With dead ends: 3816 [2021-11-23 03:19:12,639 INFO L226 Difference]: Without dead ends: 3272 [2021-11-23 03:19:12,645 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 158 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1337 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=692, Invalid=2848, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 03:19:12,646 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 563 mSDsluCounter, 399 mSDsCounter, 0 mSdLazyCounter, 326 mSolverCounterSat, 319 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 563 SdHoareTripleChecker+Valid, 490 SdHoareTripleChecker+Invalid, 645 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 319 IncrementalHoareTripleChecker+Valid, 326 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:19:12,646 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [563 Valid, 490 Invalid, 645 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [319 Valid, 326 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:19:12,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3272 states. [2021-11-23 03:19:13,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3272 to 3154. [2021-11-23 03:19:13,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3154 states, 2235 states have (on average 1.258612975391499) internal successors, (2813), 2252 states have internal predecessors, (2813), 727 states have call successors, (727), 191 states have call predecessors, (727), 191 states have return successors, (716), 710 states have call predecessors, (716), 716 states have call successors, (716) [2021-11-23 03:19:13,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3154 states to 3154 states and 4256 transitions. [2021-11-23 03:19:13,462 INFO L78 Accepts]: Start accepts. Automaton has 3154 states and 4256 transitions. Word has length 68 [2021-11-23 03:19:13,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:19:13,462 INFO L470 AbstractCegarLoop]: Abstraction has 3154 states and 4256 transitions. [2021-11-23 03:19:13,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 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) [2021-11-23 03:19:13,463 INFO L276 IsEmpty]: Start isEmpty. Operand 3154 states and 4256 transitions. [2021-11-23 03:19:13,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 03:19:13,464 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:19:13,464 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 2, 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] [2021-11-23 03:19:13,513 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 03:19:13,690 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:19:13,691 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:19:13,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:19:13,691 INFO L85 PathProgramCache]: Analyzing trace with hash 689077281, now seen corresponding path program 1 times [2021-11-23 03:19:13,691 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:19:13,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031085512] [2021-11-23 03:19:13,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:19:13,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:19:13,698 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:19:13,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1567500306] [2021-11-23 03:19:13,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:19:13,699 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:19:13,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:19:13,700 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:19:13,701 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd020fa7-6144-4c90-93ca-b186d072753e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 03:19:13,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:19:13,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 75 conjunts are in the unsatisfiable core [2021-11-23 03:19:13,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:19:15,268 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 35 proven. 43 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 03:19:15,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:19:26,455 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 35 proven. 43 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 03:19:26,455 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:19:26,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031085512] [2021-11-23 03:19:26,456 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:19:26,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1567500306] [2021-11-23 03:19:26,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1567500306] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:19:26,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [241766519] [2021-11-23 03:19:26,457 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-23 03:19:26,457 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:19:26,458 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:19:26,458 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:19:26,458 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs