./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/hard2_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_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/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_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/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_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/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 5506d4c7458a400c41a33af3f6404f1e04b9f2e97e99f1fb53b74acf6bf59baf --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:07:41,718 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:07:41,720 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:07:41,758 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:07:41,759 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:07:41,760 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:07:41,762 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:07:41,765 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:07:41,767 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:07:41,769 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:07:41,770 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:07:41,772 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:07:41,773 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:07:41,774 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:07:41,776 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:07:41,778 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:07:41,779 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:07:41,780 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:07:41,783 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:07:41,786 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:07:41,788 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:07:41,790 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:07:41,792 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:07:41,793 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:07:41,798 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:07:41,798 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:07:41,799 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:07:41,800 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:07:41,801 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:07:41,802 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:07:41,803 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:07:41,804 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:07:41,805 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:07:41,806 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:07:41,808 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:07:41,808 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:07:41,809 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:07:41,810 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:07:41,810 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:07:41,812 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:07:41,813 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:07:41,814 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:07:41,851 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:07:41,852 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:07:41,852 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:07:41,852 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:07:41,853 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:07:41,853 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:07:41,854 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:07:41,854 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:07:41,854 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:07:41,854 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:07:41,855 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:07:41,855 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:07:41,855 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:07:41,856 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:07:41,856 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:07:41,856 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:07:41,857 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:07:41,857 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:07:41,858 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:07:41,858 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:07:41,858 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:07:41,859 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:07:41,859 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:07:41,859 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:07:41,859 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:07:41,860 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:07:41,860 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:07:41,860 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:07:41,861 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:07:41,861 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:07:41,861 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:07:41,861 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:07:41,862 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:07:41,862 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:07:41,862 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:07:41,863 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:07:41,863 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:07:41,863 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:07:41,863 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:07:41,864 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:07:41,864 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:07:41,864 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_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5506d4c7458a400c41a33af3f6404f1e04b9f2e97e99f1fb53b74acf6bf59baf [2021-11-23 02:07:42,151 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:07:42,177 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:07:42,180 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:07:42,181 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:07:42,182 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:07:42,184 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c [2021-11-23 02:07:42,253 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/data/e027dddfe/f50a67e3ff1f4981a225fba28da2c85f/FLAG5771849a2 [2021-11-23 02:07:42,780 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:07:42,781 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c [2021-11-23 02:07:42,803 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/data/e027dddfe/f50a67e3ff1f4981a225fba28da2c85f/FLAG5771849a2 [2021-11-23 02:07:43,123 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/data/e027dddfe/f50a67e3ff1f4981a225fba28da2c85f [2021-11-23 02:07:43,127 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:07:43,129 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:07:43,131 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:07:43,131 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:07:43,136 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:07:43,137 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:07:43" (1/1) ... [2021-11-23 02:07:43,138 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4e76e324 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:07:43, skipping insertion in model container [2021-11-23 02:07:43,139 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:07:43" (1/1) ... [2021-11-23 02:07:43,169 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:07:43,196 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:07:43,377 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_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c[526,539] [2021-11-23 02:07:43,426 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:07:43,436 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:07:43,451 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_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c[526,539] [2021-11-23 02:07:43,459 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:07:43,474 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:07:43,475 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:07:43 WrapperNode [2021-11-23 02:07:43,475 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:07:43,477 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:07:43,477 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:07:43,477 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:07:43,486 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:07:43" (1/1) ... [2021-11-23 02:07:43,494 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:07:43" (1/1) ... [2021-11-23 02:07:43,516 INFO L137 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 61 [2021-11-23 02:07:43,517 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:07:43,517 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:07:43,518 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:07:43,518 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:07:43,528 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:07:43" (1/1) ... [2021-11-23 02:07:43,529 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:07:43" (1/1) ... [2021-11-23 02:07:43,530 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:07:43" (1/1) ... [2021-11-23 02:07:43,531 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:07:43" (1/1) ... [2021-11-23 02:07:43,535 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:07:43" (1/1) ... [2021-11-23 02:07:43,540 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:07:43" (1/1) ... [2021-11-23 02:07:43,541 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:07:43" (1/1) ... [2021-11-23 02:07:43,544 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:07:43,545 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:07:43,545 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:07:43,545 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:07:43,546 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:07:43" (1/1) ... [2021-11-23 02:07:43,561 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:07:43,576 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:07:43,590 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:07:43,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:07:43,648 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:07:43,649 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:07:43,649 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:07:43,649 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:07:43,649 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-23 02:07:43,649 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-23 02:07:43,718 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:07:43,720 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:07:43,891 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:07:43,919 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:07:43,920 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 02:07:43,922 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:07:43 BoogieIcfgContainer [2021-11-23 02:07:43,923 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:07:43,925 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:07:43,925 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:07:43,928 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:07:43,928 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:07:43" (1/3) ... [2021-11-23 02:07:43,929 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@513ec0eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:07:43, skipping insertion in model container [2021-11-23 02:07:43,930 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:07:43" (2/3) ... [2021-11-23 02:07:43,930 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@513ec0eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:07:43, skipping insertion in model container [2021-11-23 02:07:43,930 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:07:43" (3/3) ... [2021-11-23 02:07:43,932 INFO L111 eAbstractionObserver]: Analyzing ICFG hard2_unwindbound50.c [2021-11-23 02:07:43,938 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:07:43,938 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:07:43,998 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:07:44,007 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 02:07:44,007 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:07:44,028 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-23 02:07:44,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 02:07:44,033 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:44,034 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:44,035 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:44,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:44,042 INFO L85 PathProgramCache]: Analyzing trace with hash 1291730102, now seen corresponding path program 1 times [2021-11-23 02:07:44,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:44,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864727099] [2021-11-23 02:07:44,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:44,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:44,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:44,208 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:07:44,209 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:44,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864727099] [2021-11-23 02:07:44,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1864727099] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:44,210 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:44,211 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:07:44,213 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181895120] [2021-11-23 02:07:44,214 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:44,218 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 02:07:44,219 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:44,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 02:07:44,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 02:07:44,256 INFO L87 Difference]: Start difference. First operand has 22 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 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 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:44,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:44,295 INFO L93 Difference]: Finished difference Result 43 states and 74 transitions. [2021-11-23 02:07:44,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 02:07:44,299 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-23 02:07:44,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:44,308 INFO L225 Difference]: With dead ends: 43 [2021-11-23 02:07:44,308 INFO L226 Difference]: Without dead ends: 20 [2021-11-23 02:07:44,312 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 02:07:44,317 INFO L933 BasicCegarLoop]: 28 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, 28 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 02:07:44,319 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:07:44,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-23 02:07:44,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-23 02:07:44,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 02:07:44,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 29 transitions. [2021-11-23 02:07:44,376 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 29 transitions. Word has length 7 [2021-11-23 02:07:44,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:44,376 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 29 transitions. [2021-11-23 02:07:44,377 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:44,377 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 29 transitions. [2021-11-23 02:07:44,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 02:07:44,394 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:44,394 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:44,395 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:07:44,395 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:44,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:44,396 INFO L85 PathProgramCache]: Analyzing trace with hash 829671692, now seen corresponding path program 1 times [2021-11-23 02:07:44,397 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:44,397 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250566697] [2021-11-23 02:07:44,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:44,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:44,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:44,514 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:07:44,514 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:44,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250566697] [2021-11-23 02:07:44,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1250566697] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:44,515 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:44,515 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:44,516 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481957265] [2021-11-23 02:07:44,516 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:44,518 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:07:44,518 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:44,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:07:44,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:07:44,519 INFO L87 Difference]: Start difference. First operand 20 states and 29 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:44,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:44,636 INFO L93 Difference]: Finished difference Result 33 states and 46 transitions. [2021-11-23 02:07:44,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:07:44,637 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-23 02:07:44,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:44,639 INFO L225 Difference]: With dead ends: 33 [2021-11-23 02:07:44,639 INFO L226 Difference]: Without dead ends: 31 [2021-11-23 02:07:44,640 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 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 02:07:44,643 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 13 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:44,644 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 90 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:07:44,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-23 02:07:44,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 24. [2021-11-23 02:07:44,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 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 02:07:44,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2021-11-23 02:07:44,658 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 7 [2021-11-23 02:07:44,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:44,659 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2021-11-23 02:07:44,659 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:44,659 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2021-11-23 02:07:44,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 02:07:44,660 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:44,660 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:44,661 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:07:44,661 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:44,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:44,662 INFO L85 PathProgramCache]: Analyzing trace with hash -166824855, now seen corresponding path program 1 times [2021-11-23 02:07:44,663 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:44,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1314644053] [2021-11-23 02:07:44,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:44,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:44,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:44,710 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:07:44,710 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:44,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1314644053] [2021-11-23 02:07:44,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1314644053] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:44,711 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:44,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:07:44,712 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355960206] [2021-11-23 02:07:44,712 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:44,712 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:44,713 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:44,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:44,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:44,714 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:44,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:44,775 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2021-11-23 02:07:44,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:44,776 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-23 02:07:44,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:44,778 INFO L225 Difference]: With dead ends: 39 [2021-11-23 02:07:44,780 INFO L226 Difference]: Without dead ends: 26 [2021-11-23 02:07:44,781 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 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 02:07:44,783 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 0 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 73 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 02:07:44,787 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 73 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:07:44,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-23 02:07:44,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-23 02:07:44,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 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 02:07:44,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2021-11-23 02:07:44,810 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 9 [2021-11-23 02:07:44,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:44,811 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2021-11-23 02:07:44,811 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:44,821 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2021-11-23 02:07:44,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 02:07:44,823 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:44,824 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:44,824 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:07:44,825 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:44,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:44,827 INFO L85 PathProgramCache]: Analyzing trace with hash -439138420, now seen corresponding path program 1 times [2021-11-23 02:07:44,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:44,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513270169] [2021-11-23 02:07:44,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:44,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:44,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:44,924 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:07:44,924 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:44,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513270169] [2021-11-23 02:07:44,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [513270169] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:44,925 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:44,925 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:07:44,926 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617255796] [2021-11-23 02:07:44,926 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:44,927 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:07:44,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:44,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:07:44,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:07:44,929 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:07:44,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:44,989 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2021-11-23 02:07:44,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:07:44,990 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-23 02:07:44,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:44,992 INFO L225 Difference]: With dead ends: 39 [2021-11-23 02:07:44,992 INFO L226 Difference]: Without dead ends: 37 [2021-11-23 02:07:44,993 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 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 02:07:44,995 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 11 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:44,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 90 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:07:44,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-23 02:07:45,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2021-11-23 02:07:45,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 19 states have (on average 1.263157894736842) internal successors, (24), 20 states have internal predecessors, (24), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 02:07:45,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2021-11-23 02:07:45,007 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 12 [2021-11-23 02:07:45,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:45,008 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2021-11-23 02:07:45,008 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:07:45,009 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2021-11-23 02:07:45,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-23 02:07:45,010 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:45,010 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:45,010 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:07:45,010 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:45,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:45,012 INFO L85 PathProgramCache]: Analyzing trace with hash -235147060, now seen corresponding path program 1 times [2021-11-23 02:07:45,012 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:45,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1323875594] [2021-11-23 02:07:45,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:45,013 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:45,030 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:07:45,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [771882003] [2021-11-23 02:07:45,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:45,031 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:45,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:07:45,033 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:07:45,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:07:45,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:45,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:07:45,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:45,426 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:07:45,427 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:07:45,427 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:45,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1323875594] [2021-11-23 02:07:45,428 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:07:45,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [771882003] [2021-11-23 02:07:45,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [771882003] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:45,429 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:45,429 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:07:45,429 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990362544] [2021-11-23 02:07:45,430 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:45,430 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:07:45,430 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:45,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:07:45,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:07:45,432 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 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 02:07:45,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:45,512 INFO L93 Difference]: Finished difference Result 58 states and 78 transitions. [2021-11-23 02:07:45,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:07:45,515 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 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 17 [2021-11-23 02:07:45,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:45,516 INFO L225 Difference]: With dead ends: 58 [2021-11-23 02:07:45,517 INFO L226 Difference]: Without dead ends: 44 [2021-11-23 02:07:45,518 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 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 02:07:45,519 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 10 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:45,520 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 99 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:07:45,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-23 02:07:45,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-11-23 02:07:45,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 28 states have internal predecessors, (33), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-23 02:07:45,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 57 transitions. [2021-11-23 02:07:45,544 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 57 transitions. Word has length 17 [2021-11-23 02:07:45,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:45,545 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 57 transitions. [2021-11-23 02:07:45,545 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 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 02:07:45,546 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 57 transitions. [2021-11-23 02:07:45,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 02:07:45,547 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:45,547 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:45,595 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:45,748 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:45,748 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:45,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:45,749 INFO L85 PathProgramCache]: Analyzing trace with hash 2012527405, now seen corresponding path program 1 times [2021-11-23 02:07:45,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:45,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575203796] [2021-11-23 02:07:45,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:45,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:45,781 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:07:45,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1227935346] [2021-11-23 02:07:45,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:45,790 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:45,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:07:45,803 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:07:45,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:07:45,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:45,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:07:45,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:46,075 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:07:46,076 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:07:46,076 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:46,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575203796] [2021-11-23 02:07:46,076 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:07:46,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1227935346] [2021-11-23 02:07:46,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1227935346] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:46,080 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:46,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:07:46,080 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566155997] [2021-11-23 02:07:46,081 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:46,081 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:07:46,082 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:46,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:07:46,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:07:46,083 INFO L87 Difference]: Start difference. First operand 44 states and 57 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:07:46,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:46,184 INFO L93 Difference]: Finished difference Result 57 states and 74 transitions. [2021-11-23 02:07:46,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:07:46,185 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 25 [2021-11-23 02:07:46,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:46,191 INFO L225 Difference]: With dead ends: 57 [2021-11-23 02:07:46,192 INFO L226 Difference]: Without dead ends: 49 [2021-11-23 02:07:46,193 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 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 02:07:46,204 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 9 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:46,205 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 76 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:07:46,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-23 02:07:46,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2021-11-23 02:07:46,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 31 states have internal predecessors, (36), 13 states have call successors, (13), 5 states have call predecessors, (13), 5 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-23 02:07:46,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 61 transitions. [2021-11-23 02:07:46,221 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 61 transitions. Word has length 25 [2021-11-23 02:07:46,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:46,221 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 61 transitions. [2021-11-23 02:07:46,222 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:07:46,222 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 61 transitions. [2021-11-23 02:07:46,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-23 02:07:46,224 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:46,224 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:46,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:46,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:46,426 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:46,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:46,426 INFO L85 PathProgramCache]: Analyzing trace with hash 292094342, now seen corresponding path program 1 times [2021-11-23 02:07:46,427 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:46,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064789539] [2021-11-23 02:07:46,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:46,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:46,449 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:07:46,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [872997431] [2021-11-23 02:07:46,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:46,450 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:46,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:07:46,467 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:07:46,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:07:46,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:46,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:07:46,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:46,664 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 02:07:46,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:46,785 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:07:46,785 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:46,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064789539] [2021-11-23 02:07:46,787 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:07:46,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872997431] [2021-11-23 02:07:46,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872997431] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:46,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1170148055] [2021-11-23 02:07:46,822 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-23 02:07:46,822 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:07:46,828 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:07:46,835 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:07:46,835 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:07:49,696 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2021-11-23 02:07:49,717 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:07:51,006 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1030#(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 02:07:51,006 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:07:51,007 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:07:51,007 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2021-11-23 02:07:51,007 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863120410] [2021-11-23 02:07:51,007 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 02:07:51,008 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:07:51,008 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:51,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:07:51,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=313, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:07:51,009 INFO L87 Difference]: Start difference. First operand 48 states and 61 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-23 02:07:51,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:51,169 INFO L93 Difference]: Finished difference Result 134 states and 162 transitions. [2021-11-23 02:07:51,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:07:51,170 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 32 [2021-11-23 02:07:51,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:51,173 INFO L225 Difference]: With dead ends: 134 [2021-11-23 02:07:51,174 INFO L226 Difference]: Without dead ends: 111 [2021-11-23 02:07:51,175 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=87, Invalid=419, Unknown=0, NotChecked=0, Total=506 [2021-11-23 02:07:51,176 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 37 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:51,176 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 126 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:07:51,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-23 02:07:51,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 105. [2021-11-23 02:07:51,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 67 states have (on average 1.1940298507462686) internal successors, (80), 70 states have internal predecessors, (80), 23 states have call successors, (23), 14 states have call predecessors, (23), 14 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-23 02:07:51,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 124 transitions. [2021-11-23 02:07:51,197 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 124 transitions. Word has length 32 [2021-11-23 02:07:51,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:51,197 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 124 transitions. [2021-11-23 02:07:51,198 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-23 02:07:51,198 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 124 transitions. [2021-11-23 02:07:51,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-23 02:07:51,199 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:51,199 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-23 02:07:51,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:51,414 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:51,414 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:51,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:51,415 INFO L85 PathProgramCache]: Analyzing trace with hash 747162997, now seen corresponding path program 1 times [2021-11-23 02:07:51,415 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:51,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [782881170] [2021-11-23 02:07:51,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:51,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:51,426 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:07:51,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1098983747] [2021-11-23 02:07:51,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:51,427 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:51,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:07:51,428 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:07:51,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:07:51,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:51,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 02:07:51,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:51,674 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 02:07:51,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:51,799 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 02:07:51,800 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:51,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [782881170] [2021-11-23 02:07:51,800 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:07:51,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1098983747] [2021-11-23 02:07:51,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1098983747] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:07:51,801 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:07:51,801 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-11-23 02:07:51,802 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438320043] [2021-11-23 02:07:51,802 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:51,803 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:07:51,803 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:51,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:07:51,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:07:51,804 INFO L87 Difference]: Start difference. First operand 105 states and 124 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:07:52,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:52,113 INFO L93 Difference]: Finished difference Result 116 states and 134 transitions. [2021-11-23 02:07:52,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:07:52,114 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 35 [2021-11-23 02:07:52,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:52,116 INFO L225 Difference]: With dead ends: 116 [2021-11-23 02:07:52,116 INFO L226 Difference]: Without dead ends: 112 [2021-11-23 02:07:52,117 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:07:52,118 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 11 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:52,119 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 84 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:07:52,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-23 02:07:52,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2021-11-23 02:07:52,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 72 states have (on average 1.1527777777777777) internal successors, (83), 74 states have internal predecessors, (83), 23 states have call successors, (23), 16 states have call predecessors, (23), 15 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-23 02:07:52,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 127 transitions. [2021-11-23 02:07:52,166 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 127 transitions. Word has length 35 [2021-11-23 02:07:52,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:52,169 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 127 transitions. [2021-11-23 02:07:52,169 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:07:52,169 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 127 transitions. [2021-11-23 02:07:52,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 02:07:52,174 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:52,175 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:52,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:52,386 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-23 02:07:52,386 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:52,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:52,387 INFO L85 PathProgramCache]: Analyzing trace with hash 1125945480, now seen corresponding path program 1 times [2021-11-23 02:07:52,387 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:52,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435701902] [2021-11-23 02:07:52,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:52,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:52,397 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:07:52,398 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [387553667] [2021-11-23 02:07:52,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:52,398 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:52,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:07:52,404 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:07:52,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:07:52,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:52,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:07:52,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:52,580 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 36 proven. 42 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 02:07:52,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:52,715 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-23 02:07:52,716 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:52,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435701902] [2021-11-23 02:07:52,716 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:07:52,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [387553667] [2021-11-23 02:07:52,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [387553667] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:52,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1731980829] [2021-11-23 02:07:52,720 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-23 02:07:52,721 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:07:52,721 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:07:52,722 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:07:52,722 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:07:54,694 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2021-11-23 02:07:54,713 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:07:56,050 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2201#(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 02:07:56,050 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:07:56,051 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:07:56,051 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2021-11-23 02:07:56,051 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140399856] [2021-11-23 02:07:56,051 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 02:07:56,052 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 02:07:56,052 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:56,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 02:07:56,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=376, Unknown=0, NotChecked=0, Total=462 [2021-11-23 02:07:56,053 INFO L87 Difference]: Start difference. First operand 111 states and 127 transitions. Second operand has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-11-23 02:07:56,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:56,306 INFO L93 Difference]: Finished difference Result 219 states and 255 transitions. [2021-11-23 02:07:56,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:07:56,308 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 48 [2021-11-23 02:07:56,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:56,310 INFO L225 Difference]: With dead ends: 219 [2021-11-23 02:07:56,310 INFO L226 Difference]: Without dead ends: 198 [2021-11-23 02:07:56,311 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 119 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=105, Invalid=495, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:07:56,312 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 85 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:56,313 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 180 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:07:56,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-11-23 02:07:56,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 191. [2021-11-23 02:07:56,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 122 states have (on average 1.1557377049180328) internal successors, (141), 128 states have internal predecessors, (141), 43 states have call successors, (43), 26 states have call predecessors, (43), 25 states have return successors, (39), 36 states have call predecessors, (39), 39 states have call successors, (39) [2021-11-23 02:07:56,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 223 transitions. [2021-11-23 02:07:56,367 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 223 transitions. Word has length 48 [2021-11-23 02:07:56,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:56,368 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 223 transitions. [2021-11-23 02:07:56,368 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-11-23 02:07:56,368 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 223 transitions. [2021-11-23 02:07:56,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-23 02:07:56,371 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:56,371 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:56,398 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:56,592 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-23 02:07:56,592 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:56,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:56,593 INFO L85 PathProgramCache]: Analyzing trace with hash -1127123487, now seen corresponding path program 1 times [2021-11-23 02:07:56,593 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:56,593 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207689648] [2021-11-23 02:07:56,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:56,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:56,601 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:07:56,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [303284888] [2021-11-23 02:07:56,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:56,601 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:56,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:07:56,609 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:07:56,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:07:56,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:56,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 02:07:56,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:57,184 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-23 02:07:57,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:59,714 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-23 02:07:59,715 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:59,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207689648] [2021-11-23 02:07:59,715 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:07:59,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [303284888] [2021-11-23 02:07:59,716 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [303284888] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:59,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1922681319] [2021-11-23 02:07:59,719 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 02:07:59,720 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:07:59,720 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:07:59,720 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:07:59,721 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:08:33,435 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-23 02:08:33,445 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:08:34,838 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3131#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 02:08:34,838 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:08:34,838 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:08:34,839 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-11-23 02:08:34,839 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851921907] [2021-11-23 02:08:34,839 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 02:08:34,840 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 02:08:34,840 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:34,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 02:08:34,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:08:34,842 INFO L87 Difference]: Start difference. First operand 191 states and 223 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 8 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2021-11-23 02:08:36,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:36,884 INFO L93 Difference]: Finished difference Result 243 states and 278 transitions. [2021-11-23 02:08:36,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:08:36,897 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 8 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) Word has length 56 [2021-11-23 02:08:36,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:36,899 INFO L225 Difference]: With dead ends: 243 [2021-11-23 02:08:36,900 INFO L226 Difference]: Without dead ends: 233 [2021-11-23 02:08:36,901 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 140 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 237 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=152, Invalid=718, Unknown=0, NotChecked=0, Total=870 [2021-11-23 02:08:36,902 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 52 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 300 SdHoareTripleChecker+Invalid, 278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:36,902 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 300 Invalid, 278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:08:36,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-11-23 02:08:36,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 218. [2021-11-23 02:08:36,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 143 states have (on average 1.1258741258741258) internal successors, (161), 150 states have internal predecessors, (161), 42 states have call successors, (42), 32 states have call predecessors, (42), 32 states have return successors, (39), 35 states have call predecessors, (39), 39 states have call successors, (39) [2021-11-23 02:08:36,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 242 transitions. [2021-11-23 02:08:36,936 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 242 transitions. Word has length 56 [2021-11-23 02:08:36,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:36,937 INFO L470 AbstractCegarLoop]: Abstraction has 218 states and 242 transitions. [2021-11-23 02:08:36,937 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 8 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2021-11-23 02:08:36,937 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 242 transitions. [2021-11-23 02:08:36,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 02:08:36,940 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:36,940 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:36,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:08:37,166 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:08:37,166 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:37,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:37,167 INFO L85 PathProgramCache]: Analyzing trace with hash -638542057, now seen corresponding path program 2 times [2021-11-23 02:08:37,167 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:08:37,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [848505111] [2021-11-23 02:08:37,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:37,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:08:37,177 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:08:37,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2136990775] [2021-11-23 02:08:37,177 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:08:37,178 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:08:37,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:08:37,179 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:08:37,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:08:37,233 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:08:37,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:08:37,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 02:08:37,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:08:37,612 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 18 proven. 10 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-11-23 02:08:37,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:08:39,827 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 18 proven. 10 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-11-23 02:08:39,827 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:39,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [848505111] [2021-11-23 02:08:39,828 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:08:39,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2136990775] [2021-11-23 02:08:39,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2136990775] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:08:39,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1425781819] [2021-11-23 02:08:39,834 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 02:08:39,834 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:08:39,835 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:08:39,835 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:08:39,835 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:09:14,438 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-23 02:09:14,460 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:09:15,600 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4156#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 02:09:15,601 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:09:15,601 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:09:15,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2021-11-23 02:09:15,602 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075647803] [2021-11-23 02:09:15,602 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:15,603 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:09:15,603 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:15,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:09:15,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2021-11-23 02:09:15,604 INFO L87 Difference]: Start difference. First operand 218 states and 242 transitions. Second operand has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 4 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) [2021-11-23 02:09:17,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:17,645 INFO L93 Difference]: Finished difference Result 270 states and 306 transitions. [2021-11-23 02:09:17,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:09:17,646 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 4 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) Word has length 61 [2021-11-23 02:09:17,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:17,648 INFO L225 Difference]: With dead ends: 270 [2021-11-23 02:09:17,648 INFO L226 Difference]: Without dead ends: 237 [2021-11-23 02:09:17,649 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 159 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2021-11-23 02:09:17,650 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 15 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:17,651 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 200 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:09:17,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2021-11-23 02:09:17,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 232. [2021-11-23 02:09:17,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 153 states have (on average 1.1111111111111112) internal successors, (170), 160 states have internal predecessors, (170), 44 states have call successors, (44), 35 states have call predecessors, (44), 34 states have return successors, (40), 36 states have call predecessors, (40), 40 states have call successors, (40) [2021-11-23 02:09:17,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 254 transitions. [2021-11-23 02:09:17,685 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 254 transitions. Word has length 61 [2021-11-23 02:09:17,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:17,685 INFO L470 AbstractCegarLoop]: Abstraction has 232 states and 254 transitions. [2021-11-23 02:09:17,686 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 4 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) [2021-11-23 02:09:17,686 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 254 transitions. [2021-11-23 02:09:17,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 02:09:17,688 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:17,688 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:17,715 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:17,902 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:17,903 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:17,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:17,903 INFO L85 PathProgramCache]: Analyzing trace with hash -143001442, now seen corresponding path program 1 times [2021-11-23 02:09:17,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:17,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1475089417] [2021-11-23 02:09:17,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:17,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:17,912 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:09:17,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [447270457] [2021-11-23 02:09:17,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:17,913 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:17,913 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:17,945 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:17,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:09:18,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:18,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 02:09:18,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:18,675 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 66 proven. 13 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2021-11-23 02:09:18,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:18,980 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 68 proven. 2 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2021-11-23 02:09:18,980 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:18,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1475089417] [2021-11-23 02:09:18,980 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:09:18,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [447270457] [2021-11-23 02:09:18,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [447270457] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:18,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1306886985] [2021-11-23 02:09:18,984 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-23 02:09:18,984 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:09:18,985 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:09:18,985 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:09:18,985 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:09:49,632 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2021-11-23 02:09:49,660 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:09:51,106 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5273#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 02:09:51,106 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:09:51,106 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:09:51,106 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9] total 16 [2021-11-23 02:09:51,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958831661] [2021-11-23 02:09:51,107 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:51,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 02:09:51,108 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:51,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 02:09:51,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=734, Unknown=0, NotChecked=0, Total=870 [2021-11-23 02:09:51,109 INFO L87 Difference]: Start difference. First operand 232 states and 254 transitions. Second operand has 16 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 8 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 8 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-23 02:09:51,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:51,618 INFO L93 Difference]: Finished difference Result 250 states and 272 transitions. [2021-11-23 02:09:51,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 02:09:51,619 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 8 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 8 states have call predecessors, (17), 6 states have call successors, (17) Word has length 67 [2021-11-23 02:09:51,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:51,622 INFO L225 Difference]: With dead ends: 250 [2021-11-23 02:09:51,622 INFO L226 Difference]: Without dead ends: 217 [2021-11-23 02:09:51,623 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 167 SyntacticMatches, 4 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=150, Invalid=842, Unknown=0, NotChecked=0, Total=992 [2021-11-23 02:09:51,624 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 70 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 350 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 421 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 350 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:51,625 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 151 Invalid, 421 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 350 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:09:51,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-11-23 02:09:51,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 194. [2021-11-23 02:09:51,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 129 states have (on average 1.1162790697674418) internal successors, (144), 133 states have internal predecessors, (144), 36 states have call successors, (36), 29 states have call predecessors, (36), 28 states have return successors, (34), 31 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 02:09:51,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 214 transitions. [2021-11-23 02:09:51,660 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 214 transitions. Word has length 67 [2021-11-23 02:09:51,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:51,660 INFO L470 AbstractCegarLoop]: Abstraction has 194 states and 214 transitions. [2021-11-23 02:09:51,661 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 8 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 8 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-23 02:09:51,661 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 214 transitions. [2021-11-23 02:09:51,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 02:09:51,666 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:51,667 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:51,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:51,894 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 02:09:51,894 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:51,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:51,895 INFO L85 PathProgramCache]: Analyzing trace with hash -319401384, now seen corresponding path program 1 times [2021-11-23 02:09:51,895 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:51,895 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429815094] [2021-11-23 02:09:51,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:51,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:51,908 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:09:51,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1375612106] [2021-11-23 02:09:51,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:51,922 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:51,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:51,932 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:51,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:09:51,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:51,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:09:51,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:52,225 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 84 proven. 0 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-11-23 02:09:52,226 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:09:52,226 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:52,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429815094] [2021-11-23 02:09:52,227 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:09:52,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1375612106] [2021-11-23 02:09:52,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1375612106] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:52,227 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:09:52,227 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:09:52,228 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116070357] [2021-11-23 02:09:52,228 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:52,228 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:09:52,229 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:52,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:09:52,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:09:52,230 INFO L87 Difference]: Start difference. First operand 194 states and 214 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-23 02:09:52,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:52,311 INFO L93 Difference]: Finished difference Result 211 states and 233 transitions. [2021-11-23 02:09:52,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:09:52,312 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 77 [2021-11-23 02:09:52,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:52,315 INFO L225 Difference]: With dead ends: 211 [2021-11-23 02:09:52,316 INFO L226 Difference]: Without dead ends: 191 [2021-11-23 02:09:52,316 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:09:52,317 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 19 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:52,318 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 84 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:09:52,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-23 02:09:52,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 187. [2021-11-23 02:09:52,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 125 states have (on average 1.088) internal successors, (136), 128 states have internal predecessors, (136), 34 states have call successors, (34), 27 states have call predecessors, (34), 27 states have return successors, (33), 31 states have call predecessors, (33), 33 states have call successors, (33) [2021-11-23 02:09:52,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 203 transitions. [2021-11-23 02:09:52,357 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 203 transitions. Word has length 77 [2021-11-23 02:09:52,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:52,359 INFO L470 AbstractCegarLoop]: Abstraction has 187 states and 203 transitions. [2021-11-23 02:09:52,359 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-23 02:09:52,360 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 203 transitions. [2021-11-23 02:09:52,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-23 02:09:52,361 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:52,362 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2021-11-23 02:09:52,395 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:52,578 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 02:09:52,578 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:52,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:52,579 INFO L85 PathProgramCache]: Analyzing trace with hash 1528689375, now seen corresponding path program 3 times [2021-11-23 02:09:52,579 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:52,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026960756] [2021-11-23 02:09:52,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:52,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:52,588 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:09:52,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [965151077] [2021-11-23 02:09:52,589 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:09:52,589 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:52,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:52,591 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:52,598 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b31e9c4f-8ef3-4db1-93fd-c85e40a662ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:09:52,668 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:09:52,668 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:09:52,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-23 02:09:52,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:27,258 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 93 proven. 82 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-23 02:13:27,258 INFO L328 TraceCheckSpWp]: Computing backward predicates...