./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound10.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound10.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7 --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 d7b32f819b918e072cd2f6b8ef11cf08c33c51198307cb8de75af009db97bd7b --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:43:17,749 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:43:17,752 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:43:17,817 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:43:17,818 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:43:17,822 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:43:17,824 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:43:17,827 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:43:17,830 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:43:17,836 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:43:17,837 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:43:17,839 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:43:17,839 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:43:17,841 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:43:17,844 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:43:17,852 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:43:17,854 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:43:17,855 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:43:17,857 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:43:17,865 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:43:17,867 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:43:17,869 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:43:17,872 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:43:17,873 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:43:17,882 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:43:17,883 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:43:17,883 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:43:17,885 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:43:17,885 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:43:17,887 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:43:17,887 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:43:17,888 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:43:17,890 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:43:17,892 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:43:17,894 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:43:17,894 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:43:17,895 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:43:17,895 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:43:17,895 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:43:17,896 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:43:17,897 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:43:17,898 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:43:17,946 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:43:17,946 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:43:17,947 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:43:17,947 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:43:17,955 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:43:17,955 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:43:17,955 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:43:17,955 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:43:17,956 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:43:17,956 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:43:17,957 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:43:17,957 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:43:17,957 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:43:17,958 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:43:17,958 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:43:17,958 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:43:17,958 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:43:17,959 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:43:17,959 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:43:17,960 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:43:17,960 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:43:17,960 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:43:17,960 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:43:17,960 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:43:17,961 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:43:17,961 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:43:17,962 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:43:17,963 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:43:17,963 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:43:17,963 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:43:17,963 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:43:17,964 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:43:17,964 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:43:17,964 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:43:17,965 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:43:17,965 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:43:17,965 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:43:17,965 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:43:17,965 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:43:17,966 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:43:17,966 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:43:17,966 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_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d7b32f819b918e072cd2f6b8ef11cf08c33c51198307cb8de75af009db97bd7b [2021-11-25 18:43:18,257 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:43:18,275 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:43:18,278 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:43:18,279 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:43:18,284 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:43:18,286 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound10.i [2021-11-25 18:43:18,348 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/data/14e93cbb0/7362c1c2758946d48e0d901d1c931fe9/FLAG5871923ab [2021-11-25 18:43:18,793 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:43:18,794 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound10.i [2021-11-25 18:43:18,809 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/data/14e93cbb0/7362c1c2758946d48e0d901d1c931fe9/FLAG5871923ab [2021-11-25 18:43:19,181 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/data/14e93cbb0/7362c1c2758946d48e0d901d1c931fe9 [2021-11-25 18:43:19,183 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:43:19,184 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:43:19,188 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:43:19,189 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:43:19,192 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:43:19,194 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:43:19" (1/1) ... [2021-11-25 18:43:19,195 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@411d5c0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:43:19, skipping insertion in model container [2021-11-25 18:43:19,198 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:43:19" (1/1) ... [2021-11-25 18:43:19,205 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:43:19,227 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:43:19,397 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_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound10.i[951,964] [2021-11-25 18:43:19,410 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:43:19,418 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:43:19,431 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_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound10.i[951,964] [2021-11-25 18:43:19,437 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:43:19,451 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:43:19,451 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:43:19 WrapperNode [2021-11-25 18:43:19,451 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:43:19,453 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:43:19,453 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:43:19,453 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:43:19,460 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:43:19" (1/1) ... [2021-11-25 18:43:19,467 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:43:19" (1/1) ... [2021-11-25 18:43:19,485 INFO L137 Inliner]: procedures = 16, calls = 8, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 51 [2021-11-25 18:43:19,485 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:43:19,486 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:43:19,486 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:43:19,486 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:43:19,494 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:43:19" (1/1) ... [2021-11-25 18:43:19,495 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:43:19" (1/1) ... [2021-11-25 18:43:19,496 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:43:19" (1/1) ... [2021-11-25 18:43:19,496 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:43:19" (1/1) ... [2021-11-25 18:43:19,499 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:43:19" (1/1) ... [2021-11-25 18:43:19,503 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:43:19" (1/1) ... [2021-11-25 18:43:19,505 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:43:19" (1/1) ... [2021-11-25 18:43:19,506 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:43:19,507 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:43:19,507 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:43:19,508 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:43:19,513 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:43:19" (1/1) ... [2021-11-25 18:43:19,520 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:43:19,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:43:19,545 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:43:19,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:43:19,585 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:43:19,585 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:43:19,586 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:43:19,586 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:43:19,586 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 18:43:19,586 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 18:43:19,636 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:43:19,638 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:43:19,734 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:43:19,758 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:43:19,759 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 18:43:19,761 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:43:19 BoogieIcfgContainer [2021-11-25 18:43:19,762 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:43:19,764 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:43:19,764 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:43:19,767 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:43:19,768 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:43:19" (1/3) ... [2021-11-25 18:43:19,769 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45f7cc4a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:43:19, skipping insertion in model container [2021-11-25 18:43:19,769 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:43:19" (2/3) ... [2021-11-25 18:43:19,769 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45f7cc4a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:43:19, skipping insertion in model container [2021-11-25 18:43:19,770 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:43:19" (3/3) ... [2021-11-25 18:43:19,771 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin2_unwindbound10.i [2021-11-25 18:43:19,777 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:43:19,777 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:43:19,827 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:43:19,836 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 [2021-11-25 18:43:19,836 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:43:19,853 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 18:43:19,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 18:43:19,858 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:43:19,859 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:43:19,860 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:43:19,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:43:19,865 INFO L85 PathProgramCache]: Analyzing trace with hash 774102990, now seen corresponding path program 1 times [2021-11-25 18:43:19,875 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:43:19,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299184908] [2021-11-25 18:43:19,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:19,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:43:19,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:43:20,008 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:43:20,009 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:43:20,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299184908] [2021-11-25 18:43:20,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299184908] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:43:20,011 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:43:20,011 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 18:43:20,013 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541546779] [2021-11-25 18:43:20,014 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:43:20,019 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 18:43:20,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:43:20,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 18:43:20,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 18:43:20,054 INFO L87 Difference]: Start difference. First operand has 17 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) 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) [2021-11-25 18:43:20,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:43:20,087 INFO L93 Difference]: Finished difference Result 30 states and 43 transitions. [2021-11-25 18:43:20,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 18:43:20,090 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 [2021-11-25 18:43:20,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:43:20,098 INFO L225 Difference]: With dead ends: 30 [2021-11-25 18:43:20,099 INFO L226 Difference]: Without dead ends: 15 [2021-11-25 18:43:20,102 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 [2021-11-25 18:43:20,106 INFO L933 BasicCegarLoop]: 18 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, 18 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 [2021-11-25 18:43:20,108 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:43:20,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-25 18:43:20,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-25 18:43:20,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:43:20,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2021-11-25 18:43:20,145 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 7 [2021-11-25 18:43:20,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:43:20,146 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2021-11-25 18:43:20,146 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) [2021-11-25 18:43:20,147 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2021-11-25 18:43:20,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 18:43:20,148 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:43:20,148 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:43:20,148 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:43:20,149 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:43:20,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:43:20,151 INFO L85 PathProgramCache]: Analyzing trace with hash 1084410172, now seen corresponding path program 1 times [2021-11-25 18:43:20,151 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:43:20,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1254161050] [2021-11-25 18:43:20,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:20,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:43:20,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:43:20,213 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:43:20,213 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:43:20,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1254161050] [2021-11-25 18:43:20,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1254161050] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:43:20,214 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:43:20,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:43:20,215 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731937224] [2021-11-25 18:43:20,215 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:43:20,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:43:20,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:43:20,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:43:20,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:43:20,219 INFO L87 Difference]: Start difference. First operand 15 states and 19 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) [2021-11-25 18:43:20,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:43:20,246 INFO L93 Difference]: Finished difference Result 28 states and 35 transitions. [2021-11-25 18:43:20,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:43:20,247 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 [2021-11-25 18:43:20,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:43:20,248 INFO L225 Difference]: With dead ends: 28 [2021-11-25 18:43:20,248 INFO L226 Difference]: Without dead ends: 17 [2021-11-25 18:43:20,249 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 [2021-11-25 18:43:20,255 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 0 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 43 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 [2021-11-25 18:43:20,257 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 43 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:43:20,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-25 18:43:20,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-25 18:43:20,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:43:20,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-11-25 18:43:20,277 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 9 [2021-11-25 18:43:20,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:43:20,279 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-11-25 18:43:20,280 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) [2021-11-25 18:43:20,281 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-11-25 18:43:20,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 18:43:20,283 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:43:20,283 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:43:20,284 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 18:43:20,285 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:43:20,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:43:20,287 INFO L85 PathProgramCache]: Analyzing trace with hash -1068718015, now seen corresponding path program 1 times [2021-11-25 18:43:20,288 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:43:20,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546029020] [2021-11-25 18:43:20,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:20,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:43:20,323 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:43:20,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [830595273] [2021-11-25 18:43:20,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:20,340 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:20,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:43:20,348 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:43:20,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:43:20,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:43:20,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 18:43:20,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:43:20,525 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:43:20,525 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:43:20,525 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:43:20,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546029020] [2021-11-25 18:43:20,526 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:43:20,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [830595273] [2021-11-25 18:43:20,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [830595273] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:43:20,527 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:43:20,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:43:20,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260116225] [2021-11-25 18:43:20,528 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:43:20,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:43:20,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:43:20,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:43:20,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:43:20,530 INFO L87 Difference]: Start difference. First operand 17 states and 21 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, (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) [2021-11-25 18:43:20,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:43:20,573 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2021-11-25 18:43:20,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:43:20,574 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, (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 10 [2021-11-25 18:43:20,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:43:20,575 INFO L225 Difference]: With dead ends: 28 [2021-11-25 18:43:20,576 INFO L226 Difference]: Without dead ends: 21 [2021-11-25 18:43:20,577 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:43:20,578 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:43:20,580 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 55 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:43:20,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-25 18:43:20,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-11-25 18:43:20,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:43:20,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2021-11-25 18:43:20,591 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 10 [2021-11-25 18:43:20,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:43:20,592 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2021-11-25 18:43:20,592 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, (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) [2021-11-25 18:43:20,592 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2021-11-25 18:43:20,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 18:43:20,593 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:43:20,594 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:43:20,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:43:20,813 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:20,814 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:43:20,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:43:20,815 INFO L85 PathProgramCache]: Analyzing trace with hash -1066930555, now seen corresponding path program 1 times [2021-11-25 18:43:20,815 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:43:20,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [28280399] [2021-11-25 18:43:20,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:20,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:43:20,849 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:43:20,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [591172924] [2021-11-25 18:43:20,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:20,855 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:20,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:43:20,857 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:43:20,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:43:20,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:43:20,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 18:43:20,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:43:21,181 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:43:21,182 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:43:21,182 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:43:21,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [28280399] [2021-11-25 18:43:21,182 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:43:21,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [591172924] [2021-11-25 18:43:21,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [591172924] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:43:21,183 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:43:21,183 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 18:43:21,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69692479] [2021-11-25 18:43:21,184 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:43:21,192 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:43:21,192 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:43:21,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:43:21,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:43:21,194 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 4 states have internal predecessors, (9), 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) [2021-11-25 18:43:23,273 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-25 18:43:23,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:43:23,375 INFO L93 Difference]: Finished difference Result 29 states and 35 transitions. [2021-11-25 18:43:23,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:43:23,376 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 4 states have internal predecessors, (9), 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 10 [2021-11-25 18:43:23,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:43:23,378 INFO L225 Difference]: With dead ends: 29 [2021-11-25 18:43:23,378 INFO L226 Difference]: Without dead ends: 26 [2021-11-25 18:43:23,379 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:43:23,381 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 10 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:43:23,381 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 51 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 29 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2021-11-25 18:43:23,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-25 18:43:23,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-25 18:43:23,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 18:43:23,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2021-11-25 18:43:23,390 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 10 [2021-11-25 18:43:23,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:43:23,391 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2021-11-25 18:43:23,391 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 4 states have internal predecessors, (9), 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) [2021-11-25 18:43:23,391 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2021-11-25 18:43:23,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 18:43:23,392 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:43:23,393 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:43:23,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:43:23,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:23,620 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:43:23,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:43:23,621 INFO L85 PathProgramCache]: Analyzing trace with hash 1531048614, now seen corresponding path program 1 times [2021-11-25 18:43:23,621 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:43:23,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263295924] [2021-11-25 18:43:23,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:23,621 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:43:23,634 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:43:23,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2125591766] [2021-11-25 18:43:23,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:23,635 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:23,635 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:43:23,636 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:43:23,669 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:43:23,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:43:23,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 18:43:23,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:43:23,786 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:43:23,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:43:23,858 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:43:23,858 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:43:23,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263295924] [2021-11-25 18:43:23,859 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:43:23,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2125591766] [2021-11-25 18:43:23,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2125591766] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:43:23,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [69528529] [2021-11-25 18:43:23,879 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:43:23,879 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:43:23,885 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:43:23,890 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:43:23,890 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:43:24,358 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2021-11-25 18:43:24,389 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:43:25,322 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '414#(and (<= 11 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:43:25,322 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:43:25,322 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:43:25,323 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2021-11-25 18:43:25,323 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996814778] [2021-11-25 18:43:25,323 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:43:25,323 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:43:25,324 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:43:25,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:43:25,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-11-25 18:43:25,325 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 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) [2021-11-25 18:43:27,453 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-25 18:43:27,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:43:27,616 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2021-11-25 18:43:27,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 18:43:27,633 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 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 12 [2021-11-25 18:43:27,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:43:27,634 INFO L225 Difference]: With dead ends: 57 [2021-11-25 18:43:27,635 INFO L226 Difference]: Without dead ends: 46 [2021-11-25 18:43:27,635 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2021-11-25 18:43:27,636 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 28 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:43:27,637 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 82 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 32 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2021-11-25 18:43:27,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-25 18:43:27,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 34. [2021-11-25 18:43:27,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 29 states have internal predecessors, (36), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 18:43:27,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2021-11-25 18:43:27,644 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 12 [2021-11-25 18:43:27,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:43:27,644 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2021-11-25 18:43:27,645 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 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) [2021-11-25 18:43:27,645 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2021-11-25 18:43:27,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 18:43:27,646 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:43:27,646 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:43:27,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:43:27,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:27,857 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:43:27,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:43:27,858 INFO L85 PathProgramCache]: Analyzing trace with hash -107828201, now seen corresponding path program 1 times [2021-11-25 18:43:27,858 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:43:27,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161868350] [2021-11-25 18:43:27,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:27,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:43:27,871 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:43:27,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1703425028] [2021-11-25 18:43:27,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:27,872 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:27,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:43:27,876 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:43:27,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:43:27,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:43:27,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 18:43:27,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:43:28,001 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:43:28,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:43:28,086 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:43:28,087 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:43:28,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161868350] [2021-11-25 18:43:28,087 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:43:28,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1703425028] [2021-11-25 18:43:28,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1703425028] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:43:28,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1993173112] [2021-11-25 18:43:28,090 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:43:28,090 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:43:28,091 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:43:28,091 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:43:28,092 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:43:28,359 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2021-11-25 18:43:28,400 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:43:29,290 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '627#(and (<= 11 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:43:29,291 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:43:29,291 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:43:29,291 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 9 [2021-11-25 18:43:29,291 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781536187] [2021-11-25 18:43:29,291 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:43:29,292 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 18:43:29,292 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:43:29,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 18:43:29,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-11-25 18:43:29,294 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 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) [2021-11-25 18:43:29,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:43:29,514 INFO L93 Difference]: Finished difference Result 81 states and 97 transitions. [2021-11-25 18:43:29,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 18:43:29,515 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 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 13 [2021-11-25 18:43:29,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:43:29,517 INFO L225 Difference]: With dead ends: 81 [2021-11-25 18:43:29,517 INFO L226 Difference]: Without dead ends: 74 [2021-11-25 18:43:29,518 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2021-11-25 18:43:29,519 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 63 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:43:29,519 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 109 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:43:29,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-11-25 18:43:29,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 67. [2021-11-25 18:43:29,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 52 states have (on average 1.3269230769230769) internal successors, (69), 56 states have internal predecessors, (69), 9 states have call successors, (9), 5 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-25 18:43:29,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 83 transitions. [2021-11-25 18:43:29,531 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 83 transitions. Word has length 13 [2021-11-25 18:43:29,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:43:29,532 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 83 transitions. [2021-11-25 18:43:29,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 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) [2021-11-25 18:43:29,532 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 83 transitions. [2021-11-25 18:43:29,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 18:43:29,533 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:43:29,533 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:43:29,565 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:43:29,759 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:29,760 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:43:29,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:43:29,760 INFO L85 PathProgramCache]: Analyzing trace with hash -106040741, now seen corresponding path program 1 times [2021-11-25 18:43:29,760 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:43:29,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207394352] [2021-11-25 18:43:29,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:29,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:43:29,771 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:43:29,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1278040595] [2021-11-25 18:43:29,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:29,772 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:29,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:43:29,773 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:43:29,781 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:43:29,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:43:29,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 18:43:29,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:43:30,052 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:43:30,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:43:33,857 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:43:33,857 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:43:33,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207394352] [2021-11-25 18:43:33,857 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:43:33,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1278040595] [2021-11-25 18:43:33,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1278040595] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 18:43:33,858 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:43:33,858 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 9 [2021-11-25 18:43:33,858 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886721733] [2021-11-25 18:43:33,858 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:43:33,859 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 18:43:33,859 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:43:33,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 18:43:33,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=61, Unknown=1, NotChecked=0, Total=90 [2021-11-25 18:43:33,860 INFO L87 Difference]: Start difference. First operand 67 states and 83 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 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) [2021-11-25 18:43:38,587 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:43:40,714 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-25 18:43:42,839 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-25 18:43:44,983 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:43:47,120 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:43:49,265 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:43:49,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:43:49,439 INFO L93 Difference]: Finished difference Result 113 states and 139 transitions. [2021-11-25 18:43:49,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 18:43:49,439 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 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 13 [2021-11-25 18:43:49,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:43:49,443 INFO L225 Difference]: With dead ends: 113 [2021-11-25 18:43:49,443 INFO L226 Difference]: Without dead ends: 107 [2021-11-25 18:43:49,444 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=39, Invalid=91, Unknown=2, NotChecked=0, Total=132 [2021-11-25 18:43:49,445 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 17 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 2 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 12.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:43:49,445 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 100 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 21 Invalid, 6 Unknown, 21 Unchecked, 12.9s Time] [2021-11-25 18:43:49,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-25 18:43:49,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 98. [2021-11-25 18:43:49,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 75 states have (on average 1.2133333333333334) internal successors, (91), 79 states have internal predecessors, (91), 13 states have call successors, (13), 9 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 18:43:49,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 113 transitions. [2021-11-25 18:43:49,461 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 113 transitions. Word has length 13 [2021-11-25 18:43:49,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:43:49,462 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 113 transitions. [2021-11-25 18:43:49,462 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 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) [2021-11-25 18:43:49,462 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 113 transitions. [2021-11-25 18:43:49,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-25 18:43:49,463 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:43:49,464 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:43:49,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:43:49,691 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:49,692 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:43:49,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:43:49,692 INFO L85 PathProgramCache]: Analyzing trace with hash 1345144360, now seen corresponding path program 1 times [2021-11-25 18:43:49,692 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:43:49,692 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35101651] [2021-11-25 18:43:49,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:49,692 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:43:49,702 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:43:49,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1785616573] [2021-11-25 18:43:49,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:49,703 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:49,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:43:49,705 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:43:49,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:43:49,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:43:49,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 18:43:49,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:43:49,823 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:43:49,823 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:43:49,823 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:43:49,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35101651] [2021-11-25 18:43:49,824 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:43:49,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1785616573] [2021-11-25 18:43:49,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1785616573] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:43:49,824 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:43:49,824 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:43:49,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216874406] [2021-11-25 18:43:49,825 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:43:49,825 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:43:49,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:43:49,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:43:49,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:43:49,826 INFO L87 Difference]: Start difference. First operand 98 states and 113 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 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) [2021-11-25 18:43:49,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:43:49,850 INFO L93 Difference]: Finished difference Result 129 states and 150 transitions. [2021-11-25 18:43:49,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:43:49,851 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 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 18 [2021-11-25 18:43:49,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:43:49,853 INFO L225 Difference]: With dead ends: 129 [2021-11-25 18:43:49,853 INFO L226 Difference]: Without dead ends: 81 [2021-11-25 18:43:49,854 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:43:49,854 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:43:49,855 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 30 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:43:49,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-25 18:43:49,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2021-11-25 18:43:49,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 63 states have (on average 1.2063492063492063) internal successors, (76), 66 states have internal predecessors, (76), 10 states have call successors, (10), 7 states have call predecessors, (10), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-25 18:43:49,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 93 transitions. [2021-11-25 18:43:49,866 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 93 transitions. Word has length 18 [2021-11-25 18:43:49,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:43:49,867 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 93 transitions. [2021-11-25 18:43:49,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 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) [2021-11-25 18:43:49,867 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 93 transitions. [2021-11-25 18:43:49,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-25 18:43:49,869 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:43:49,869 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:43:49,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 18:43:50,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-25 18:43:50,095 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:43:50,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:43:50,095 INFO L85 PathProgramCache]: Analyzing trace with hash -1577774082, now seen corresponding path program 1 times [2021-11-25 18:43:50,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:43:50,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [277962410] [2021-11-25 18:43:50,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:50,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:43:50,116 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:43:50,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [758850815] [2021-11-25 18:43:50,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:50,119 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:50,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:43:50,120 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:43:50,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 18:43:50,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:43:50,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 18:43:50,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:43:50,707 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:43:50,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:44:30,437 WARN L227 SmtUtils]: Spent 9.45s on a formula simplification that was a NOOP. DAG size: 32 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:44:50,450 WARN L227 SmtUtils]: Spent 6.54s on a formula simplification that was a NOOP. DAG size: 34 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:45:27,486 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse0 (mod |c_ULTIMATE.start_main_~r~0#1| 4294967296)) (.cse1 (mod (* |c_ULTIMATE.start_main_~b~0#1| 2) 4294967296))) (or (< .cse0 (mod |c_ULTIMATE.start_main_~b~0#1| 4294967296)) (<= .cse1 .cse0) (let ((.cse5 (div .cse1 2))) (let ((.cse2 (* (- 2) .cse5 |c_ULTIMATE.start_main_~q~0#1|)) (.cse3 (* (- 1) |c_ULTIMATE.start_main_~r~0#1|)) (.cse4 (mod |c_ULTIMATE.start_main_~A~0#1| 4294967296))) (and (<= (div (+ .cse2 .cse3 .cse4) (- 4294967296)) (+ (div (+ (* 2 .cse5 |c_ULTIMATE.start_main_~q~0#1|) |c_ULTIMATE.start_main_~r~0#1| (- 4294967296)) 4294967296) 1)) (<= (div (+ .cse2 (- 1) .cse3) (- 4294967296)) (div (+ .cse2 (- 1) .cse3 .cse4) (- 4294967296)))))) (= (mod |c_ULTIMATE.start_main_~B~0#1| 4294967296) .cse1))) is different from true [2021-11-25 18:45:59,865 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 3 not checked. [2021-11-25 18:45:59,865 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:45:59,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [277962410] [2021-11-25 18:45:59,866 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:45:59,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [758850815] [2021-11-25 18:45:59,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [758850815] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:45:59,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [772515792] [2021-11-25 18:45:59,869 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 18:45:59,870 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:45:59,870 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:45:59,870 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:45:59,871 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:46:01,898 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2021-11-25 18:46:01,953 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:46:27,034 WARN L227 SmtUtils]: Spent 14.00s on a formula simplification. DAG size of input: 100 DAG size of output: 95 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:46:44,483 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1650#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 11) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:46:44,484 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:46:44,484 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:46:44,484 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-11-25 18:46:44,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091902994] [2021-11-25 18:46:44,485 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:46:44,485 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 18:46:44,485 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:46:44,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 18:46:44,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=384, Unknown=17, NotChecked=40, Total=506 [2021-11-25 18:46:44,486 INFO L87 Difference]: Start difference. First operand 81 states and 93 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 18:47:02,645 WARN L227 SmtUtils]: Spent 15.62s on a formula simplification that was a NOOP. DAG size: 37 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:47:04,661 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:47:06,802 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:47:08,951 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:47:11,299 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:47:13,486 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:47:15,626 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:47:17,869 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:47:20,180 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-25 18:47:22,367 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:47:24,628 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:47:26,775 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:47:26,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:26,901 INFO L93 Difference]: Finished difference Result 93 states and 106 transitions. [2021-11-25 18:47:26,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 18:47:26,902 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), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2021-11-25 18:47:26,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:26,903 INFO L225 Difference]: With dead ends: 93 [2021-11-25 18:47:26,903 INFO L226 Difference]: Without dead ends: 89 [2021-11-25 18:47:26,904 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 92.3s TimeCoverageRelationStatistics Valid=85, Invalid=501, Unknown=18, NotChecked=46, Total=650 [2021-11-25 18:47:26,905 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 26 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 14 mSolverCounterUnsat, 11 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 22.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 11 IncrementalHoareTripleChecker+Unknown, 44 IncrementalHoareTripleChecker+Unchecked, 24.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:26,905 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 141 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 87 Invalid, 11 Unknown, 44 Unchecked, 24.1s Time] [2021-11-25 18:47:26,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-25 18:47:26,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 80. [2021-11-25 18:47:26,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 63 states have (on average 1.1746031746031746) internal successors, (74), 65 states have internal predecessors, (74), 9 states have call successors, (9), 7 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-25 18:47:26,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 90 transitions. [2021-11-25 18:47:26,918 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 90 transitions. Word has length 21 [2021-11-25 18:47:26,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:26,918 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 90 transitions. [2021-11-25 18:47:26,919 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), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 18:47:26,919 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 90 transitions. [2021-11-25 18:47:26,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-25 18:47:26,920 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:26,920 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:47:26,939 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 18:47:27,124 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-25 18:47:27,125 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:27,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:27,125 INFO L85 PathProgramCache]: Analyzing trace with hash -617980160, now seen corresponding path program 1 times [2021-11-25 18:47:27,126 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:27,126 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2115579473] [2021-11-25 18:47:27,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:27,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:27,139 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:47:27,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [874955041] [2021-11-25 18:47:27,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:27,140 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:27,140 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:27,141 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:47:27,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 18:47:27,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:27,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 18:47:27,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:47:27,317 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:27,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:47:27,502 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:27,503 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:27,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2115579473] [2021-11-25 18:47:27,503 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:47:27,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [874955041] [2021-11-25 18:47:27,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [874955041] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:47:27,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1567652322] [2021-11-25 18:47:27,506 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:47:27,506 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:47:27,506 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:47:27,507 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:47:27,507 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:47:27,683 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2021-11-25 18:47:27,708 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:47:28,654 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2024#(and (<= 2 ~counter~0) (< ~counter~0 11) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:47:28,655 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:47:28,655 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:47:28,655 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 13 [2021-11-25 18:47:28,655 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332044375] [2021-11-25 18:47:28,655 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:47:28,656 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 18:47:28,656 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:47:28,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 18:47:28,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2021-11-25 18:47:28,657 INFO L87 Difference]: Start difference. First operand 80 states and 90 transitions. Second operand has 14 states, 14 states have (on average 2.5) internal successors, (35), 13 states have internal predecessors, (35), 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) [2021-11-25 18:47:29,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:29,135 INFO L93 Difference]: Finished difference Result 186 states and 214 transitions. [2021-11-25 18:47:29,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 18:47:29,136 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.5) internal successors, (35), 13 states have internal predecessors, (35), 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 21 [2021-11-25 18:47:29,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:29,137 INFO L225 Difference]: With dead ends: 186 [2021-11-25 18:47:29,137 INFO L226 Difference]: Without dead ends: 173 [2021-11-25 18:47:29,138 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=206, Invalid=724, Unknown=0, NotChecked=0, Total=930 [2021-11-25 18:47:29,139 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 139 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:29,139 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 139 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:47:29,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-11-25 18:47:29,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 95. [2021-11-25 18:47:29,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 78 states have (on average 1.1923076923076923) internal successors, (93), 80 states have internal predecessors, (93), 9 states have call successors, (9), 7 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-25 18:47:29,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 109 transitions. [2021-11-25 18:47:29,154 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 109 transitions. Word has length 21 [2021-11-25 18:47:29,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:29,155 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 109 transitions. [2021-11-25 18:47:29,155 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.5) internal successors, (35), 13 states have internal predecessors, (35), 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) [2021-11-25 18:47:29,155 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 109 transitions. [2021-11-25 18:47:29,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-25 18:47:29,157 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:29,157 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:47:29,197 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 18:47:29,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 18:47:29,375 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:29,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:29,376 INFO L85 PathProgramCache]: Analyzing trace with hash -1160838210, now seen corresponding path program 2 times [2021-11-25 18:47:29,376 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:29,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847801918] [2021-11-25 18:47:29,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:29,376 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:29,411 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:47:29,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [907432990] [2021-11-25 18:47:29,412 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:47:29,412 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:29,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:29,415 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:47:29,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c3ca284-6476-4ef5-95d6-d2b5a0c83b74/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process