./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/rekh_ctm.1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/rekh_ctm.1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash c3ec7c03a28dc415c6db5fadbfd8dcd491b1a493cd1bf88ef12d02131cd13437 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:18:48,150 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:18:48,152 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:18:48,192 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:18:48,193 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:18:48,194 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:18:48,197 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:18:48,200 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:18:48,203 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:18:48,204 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:18:48,206 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:18:48,208 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:18:48,209 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:18:48,211 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:18:48,213 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:18:48,215 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:18:48,217 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:18:48,218 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:18:48,221 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:18:48,225 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:18:48,227 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:18:48,230 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:18:48,232 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:18:48,233 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:18:48,238 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:18:48,239 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:18:48,239 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:18:48,241 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:18:48,242 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:18:48,243 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:18:48,244 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:18:48,246 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:18:48,247 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:18:48,248 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:18:48,250 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:18:48,250 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:18:48,252 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:18:48,254 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:18:48,255 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:18:48,256 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:18:48,257 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:18:48,259 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:18:48,322 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:18:48,323 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:18:48,324 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:18:48,324 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:18:48,332 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:18:48,333 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:18:48,333 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:18:48,334 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:18:48,334 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:18:48,334 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:18:48,335 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:18:48,336 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:18:48,336 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:18:48,336 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:18:48,337 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:18:48,337 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:18:48,337 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:18:48,337 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:18:48,338 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:18:48,339 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:18:48,339 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:18:48,339 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:18:48,340 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:18:48,340 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:18:48,340 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:18:48,340 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:18:48,342 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:18:48,343 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:18:48,343 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:18:48,343 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:18:48,344 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:18:48,344 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:18:48,344 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:18:48,345 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:18:48,345 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:18:48,345 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:18:48,346 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:18:48,346 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:18:48,346 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:18:48,346 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:18:48,347 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:18:48,347 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_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c3ec7c03a28dc415c6db5fadbfd8dcd491b1a493cd1bf88ef12d02131cd13437 [2021-11-23 02:18:48,738 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:18:48,781 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:18:48,784 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:18:48,786 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:18:48,787 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:18:48,788 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/seq-mthreaded/rekh_ctm.1.c [2021-11-23 02:18:48,868 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/data/bcbad8998/4ec52dce633c4bba88c50535835a714d/FLAGfcd04e063 [2021-11-23 02:18:49,755 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:18:49,756 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/sv-benchmarks/c/seq-mthreaded/rekh_ctm.1.c [2021-11-23 02:18:49,783 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/data/bcbad8998/4ec52dce633c4bba88c50535835a714d/FLAGfcd04e063 [2021-11-23 02:18:49,813 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/data/bcbad8998/4ec52dce633c4bba88c50535835a714d [2021-11-23 02:18:49,816 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:18:49,820 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:18:49,824 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:18:49,824 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:18:49,828 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:18:49,829 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:18:49" (1/1) ... [2021-11-23 02:18:49,832 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c822f40 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:49, skipping insertion in model container [2021-11-23 02:18:49,833 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:18:49" (1/1) ... [2021-11-23 02:18:49,843 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:18:49,969 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:18:50,249 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_8744da5c-21b3-455a-b9de-60f2fd5ebe90/sv-benchmarks/c/seq-mthreaded/rekh_ctm.1.c[1868,1881] [2021-11-23 02:18:50,916 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:18:50,963 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:18:50,981 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_8744da5c-21b3-455a-b9de-60f2fd5ebe90/sv-benchmarks/c/seq-mthreaded/rekh_ctm.1.c[1868,1881] [2021-11-23 02:18:51,225 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:18:51,326 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:18:51,327 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:51 WrapperNode [2021-11-23 02:18:51,327 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:18:51,328 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:18:51,329 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:18:51,329 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:18:51,339 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:51" (1/1) ... [2021-11-23 02:18:51,446 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:51" (1/1) ... [2021-11-23 02:18:51,684 INFO L137 Inliner]: procedures = 99, calls = 2727, calls flagged for inlining = 35, calls inlined = 35, statements flattened = 8247 [2021-11-23 02:18:51,686 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:18:51,687 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:18:51,687 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:18:51,687 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:18:51,699 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:51" (1/1) ... [2021-11-23 02:18:51,700 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:51" (1/1) ... [2021-11-23 02:18:51,847 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:51" (1/1) ... [2021-11-23 02:18:51,847 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:51" (1/1) ... [2021-11-23 02:18:52,007 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:51" (1/1) ... [2021-11-23 02:18:52,115 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:51" (1/1) ... [2021-11-23 02:18:52,144 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:51" (1/1) ... [2021-11-23 02:18:52,213 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:18:52,215 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:18:52,215 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:18:52,216 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:18:52,217 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:51" (1/1) ... [2021-11-23 02:18:52,229 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:18:52,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:52,260 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:18:52,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:18:52,326 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_W_state [2021-11-23 02:18:52,326 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_W_state [2021-11-23 02:18:52,327 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_T_state [2021-11-23 02:18:52,327 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_T_state [2021-11-23 02:18:52,327 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 02:18:52,327 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_need_to_run_nxtbg [2021-11-23 02:18:52,328 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_need_to_run_nxtbg [2021-11-23 02:18:52,328 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_set_count [2021-11-23 02:18:52,328 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_set_count [2021-11-23 02:18:52,328 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write___startrek_current_priority [2021-11-23 02:18:52,328 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write___startrek_current_priority [2021-11-23 02:18:52,330 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_input [2021-11-23 02:18:52,330 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_input [2021-11-23 02:18:52,330 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_hyperperiod [2021-11-23 02:18:52,330 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_hyperperiod [2021-11-23 02:18:52,331 INFO L130 BoogieDeclarations]: Found specification of procedure bg_nxtcolorsensor [2021-11-23 02:18:52,331 INFO L138 BoogieDeclarations]: Found implementation of procedure bg_nxtcolorsensor [2021-11-23 02:18:52,331 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_Writer [2021-11-23 02:18:52,331 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_Writer [2021-11-23 02:18:52,331 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_nxtcolorsensor_mode [2021-11-23 02:18:52,332 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_nxtcolorsensor_mode [2021-11-23 02:18:52,332 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 02:18:52,332 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2021-11-23 02:18:52,332 INFO L138 BoogieDeclarations]: Found implementation of procedure assert [2021-11-23 02:18:52,332 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_R_count [2021-11-23 02:18:52,333 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_R_count [2021-11-23 02:18:52,333 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_T_state [2021-11-23 02:18:52,333 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_T_state [2021-11-23 02:18:52,333 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_output [2021-11-23 02:18:52,334 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_output [2021-11-23 02:18:52,334 INFO L130 BoogieDeclarations]: Found specification of procedure move_motor [2021-11-23 02:18:52,334 INFO L138 BoogieDeclarations]: Found implementation of procedure move_motor [2021-11-23 02:18:52,334 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_R_speed [2021-11-23 02:18:52,334 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_R_speed [2021-11-23 02:18:52,335 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_get_count [2021-11-23 02:18:52,335 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_get_count [2021-11-23 02:18:52,335 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:18:52,336 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t2 [2021-11-23 02:18:52,336 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t2 [2021-11-23 02:18:52,336 INFO L130 BoogieDeclarations]: Found specification of procedure ecrobot_set_nxtcolorsensor [2021-11-23 02:18:52,336 INFO L138 BoogieDeclarations]: Found implementation of procedure ecrobot_set_nxtcolorsensor [2021-11-23 02:18:52,336 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t3 [2021-11-23 02:18:52,337 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t3 [2021-11-23 02:18:52,337 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_output [2021-11-23 02:18:52,337 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_output [2021-11-23 02:18:52,338 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t0 [2021-11-23 02:18:52,339 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t0 [2021-11-23 02:18:52,340 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_T_count [2021-11-23 02:18:52,340 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_T_count [2021-11-23 02:18:52,341 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t1 [2021-11-23 02:18:52,341 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t1 [2021-11-23 02:18:52,341 INFO L130 BoogieDeclarations]: Found specification of procedure TerminateTask [2021-11-23 02:18:52,342 INFO L138 BoogieDeclarations]: Found implementation of procedure TerminateTask [2021-11-23 02:18:52,342 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_W_count [2021-11-23 02:18:52,343 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_W_count [2021-11-23 02:18:52,343 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read___startrek_current_priority [2021-11-23 02:18:52,343 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read___startrek_current_priority [2021-11-23 02:18:52,343 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_W_count [2021-11-23 02:18:52,343 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_W_count [2021-11-23 02:18:52,344 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_T_count [2021-11-23 02:18:52,344 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_T_count [2021-11-23 02:18:52,344 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_T_speed [2021-11-23 02:18:52,345 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_T_speed [2021-11-23 02:18:52,345 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_nxtcolorsensor_data_mode [2021-11-23 02:18:52,345 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_nxtcolorsensor_data_mode [2021-11-23 02:18:52,345 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_threshold [2021-11-23 02:18:52,345 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_threshold [2021-11-23 02:18:52,346 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_need_to_read [2021-11-23 02:18:52,346 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_need_to_read [2021-11-23 02:18:52,346 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_R_state [2021-11-23 02:18:52,346 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_R_state [2021-11-23 02:18:52,346 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_Reader [2021-11-23 02:18:52,348 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_Reader [2021-11-23 02:18:52,348 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_dir [2021-11-23 02:18:52,348 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_dir [2021-11-23 02:18:52,348 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_W_speed [2021-11-23 02:18:52,349 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_W_speed [2021-11-23 02:18:52,349 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_input [2021-11-23 02:18:52,349 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_input [2021-11-23 02:18:52,349 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_R_state [2021-11-23 02:18:52,349 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_R_state [2021-11-23 02:18:52,350 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_need_to_run_nxtbg [2021-11-23 02:18:52,350 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_need_to_run_nxtbg [2021-11-23 02:18:52,350 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_W_state [2021-11-23 02:18:52,351 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_W_state [2021-11-23 02:18:52,351 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_R_count [2021-11-23 02:18:52,351 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_R_count [2021-11-23 02:18:52,351 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_TapeMover [2021-11-23 02:18:52,351 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_TapeMover [2021-11-23 02:18:52,352 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:18:52,352 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_Controller [2021-11-23 02:18:52,352 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_Controller [2021-11-23 02:18:52,352 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:18:52,352 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:18:53,179 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:18:53,183 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:19:09,404 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:19:19,090 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:19:19,090 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-23 02:19:19,098 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:19:19 BoogieIcfgContainer [2021-11-23 02:19:19,098 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:19:19,102 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:19:19,102 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:19:19,106 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:19:19,107 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:18:49" (1/3) ... [2021-11-23 02:19:19,108 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1885da50 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:19:19, skipping insertion in model container [2021-11-23 02:19:19,108 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:51" (2/3) ... [2021-11-23 02:19:19,110 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1885da50 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:19:19, skipping insertion in model container [2021-11-23 02:19:19,111 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:19:19" (3/3) ... [2021-11-23 02:19:19,115 INFO L111 eAbstractionObserver]: Analyzing ICFG rekh_ctm.1.c [2021-11-23 02:19:19,129 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:19:19,130 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:19:19,218 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:19:19,239 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:19:19,245 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:19:19,324 INFO L276 IsEmpty]: Start isEmpty. Operand has 962 states, 611 states have (on average 1.386252045826514) internal successors, (847), 635 states have internal predecessors, (847), 305 states have call successors, (305), 44 states have call predecessors, (305), 44 states have return successors, (305), 295 states have call predecessors, (305), 305 states have call successors, (305) [2021-11-23 02:19:19,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 02:19:19,334 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:19,342 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:19:19,343 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:19,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:19,350 INFO L85 PathProgramCache]: Analyzing trace with hash -1110822853, now seen corresponding path program 1 times [2021-11-23 02:19:19,362 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:19,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1085761839] [2021-11-23 02:19:19,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:19,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:20,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:20,330 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:19:20,331 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:20,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1085761839] [2021-11-23 02:19:20,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1085761839] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:20,333 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:20,333 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:19:20,335 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256827850] [2021-11-23 02:19:20,336 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:20,342 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 02:19:20,342 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:20,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 02:19:20,378 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 02:19:20,384 INFO L87 Difference]: Start difference. First operand has 962 states, 611 states have (on average 1.386252045826514) internal successors, (847), 635 states have internal predecessors, (847), 305 states have call successors, (305), 44 states have call predecessors, (305), 44 states have return successors, (305), 295 states have call predecessors, (305), 305 states have call successors, (305) Second operand has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:19:22,825 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:19:23,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:23,942 INFO L93 Difference]: Finished difference Result 1922 states and 2929 transitions. [2021-11-23 02:19:23,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 02:19:23,953 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 23 [2021-11-23 02:19:23,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:24,003 INFO L225 Difference]: With dead ends: 1922 [2021-11-23 02:19:24,005 INFO L226 Difference]: Without dead ends: 960 [2021-11-23 02:19:24,029 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 02:19:24,036 INFO L933 BasicCegarLoop]: 1370 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 1370 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:24,038 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 1370 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 81 Invalid, 1 Unknown, 0 Unchecked, 3.4s Time] [2021-11-23 02:19:24,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 960 states. [2021-11-23 02:19:24,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 960 to 960. [2021-11-23 02:19:24,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 960 states, 610 states have (on average 1.3786885245901639) internal successors, (841), 634 states have internal predecessors, (841), 305 states have call successors, (305), 44 states have call predecessors, (305), 44 states have return successors, (304), 294 states have call predecessors, (304), 304 states have call successors, (304) [2021-11-23 02:19:24,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 960 states to 960 states and 1450 transitions. [2021-11-23 02:19:24,246 INFO L78 Accepts]: Start accepts. Automaton has 960 states and 1450 transitions. Word has length 23 [2021-11-23 02:19:24,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:24,248 INFO L470 AbstractCegarLoop]: Abstraction has 960 states and 1450 transitions. [2021-11-23 02:19:24,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:19:24,249 INFO L276 IsEmpty]: Start isEmpty. Operand 960 states and 1450 transitions. [2021-11-23 02:19:24,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 02:19:24,268 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:24,269 INFO L514 BasicCegarLoop]: trace histogram [7, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:19:24,269 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:19:24,269 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:24,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:24,271 INFO L85 PathProgramCache]: Analyzing trace with hash 1168525283, now seen corresponding path program 1 times [2021-11-23 02:19:24,271 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:24,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2100659494] [2021-11-23 02:19:24,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:24,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:24,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:25,274 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 02:19:25,274 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:25,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2100659494] [2021-11-23 02:19:25,275 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2100659494] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:25,275 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:25,275 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:19:25,276 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909152423] [2021-11-23 02:19:25,276 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:25,277 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:19:25,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:25,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:19:25,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:19:25,279 INFO L87 Difference]: Start difference. First operand 960 states and 1450 transitions. Second operand has 5 states, 4 states have (on average 10.25) internal successors, (41), 5 states have internal predecessors, (41), 4 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:19:28,032 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:19:33,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:33,209 INFO L93 Difference]: Finished difference Result 2271 states and 3417 transitions. [2021-11-23 02:19:33,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:19:33,210 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 10.25) internal successors, (41), 5 states have internal predecessors, (41), 4 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 81 [2021-11-23 02:19:33,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:33,231 INFO L225 Difference]: With dead ends: 2271 [2021-11-23 02:19:33,231 INFO L226 Difference]: Without dead ends: 1313 [2021-11-23 02:19:33,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:19:33,243 INFO L933 BasicCegarLoop]: 1598 mSDtfsCounter, 2731 mSDsluCounter, 898 mSDsCounter, 0 mSdLazyCounter, 1527 mSolverCounterSat, 583 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2731 SdHoareTripleChecker+Valid, 2391 SdHoareTripleChecker+Invalid, 2111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 583 IncrementalHoareTripleChecker+Valid, 1527 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:33,244 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2731 Valid, 2391 Invalid, 2111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [583 Valid, 1527 Invalid, 1 Unknown, 0 Unchecked, 7.6s Time] [2021-11-23 02:19:33,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1313 states. [2021-11-23 02:19:33,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1313 to 1310. [2021-11-23 02:19:33,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1310 states, 840 states have (on average 1.380952380952381) internal successors, (1160), 873 states have internal predecessors, (1160), 400 states have call successors, (400), 69 states have call predecessors, (400), 69 states have return successors, (399), 385 states have call predecessors, (399), 399 states have call successors, (399) [2021-11-23 02:19:33,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1310 states to 1310 states and 1959 transitions. [2021-11-23 02:19:33,554 INFO L78 Accepts]: Start accepts. Automaton has 1310 states and 1959 transitions. Word has length 81 [2021-11-23 02:19:33,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:33,555 INFO L470 AbstractCegarLoop]: Abstraction has 1310 states and 1959 transitions. [2021-11-23 02:19:33,555 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 10.25) internal successors, (41), 5 states have internal predecessors, (41), 4 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:19:33,555 INFO L276 IsEmpty]: Start isEmpty. Operand 1310 states and 1959 transitions. [2021-11-23 02:19:33,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 02:19:33,562 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:33,563 INFO L514 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:19:33,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:19:33,564 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:33,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:33,565 INFO L85 PathProgramCache]: Analyzing trace with hash 1776621228, now seen corresponding path program 1 times [2021-11-23 02:19:33,565 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:33,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796130341] [2021-11-23 02:19:33,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:33,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:33,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:34,109 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 02:19:34,109 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:34,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1796130341] [2021-11-23 02:19:34,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1796130341] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:19:34,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [880696902] [2021-11-23 02:19:34,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:34,111 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:19:34,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:19:34,118 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:19:34,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:19:35,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:35,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 1700 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:19:35,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:19:35,571 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 02:19:35,571 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:19:35,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [880696902] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:35,572 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:19:35,572 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 8 [2021-11-23 02:19:35,572 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80398738] [2021-11-23 02:19:35,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:35,573 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:19:35,573 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:35,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:19:35,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:19:35,575 INFO L87 Difference]: Start difference. First operand 1310 states and 1959 transitions. Second operand has 5 states, 5 states have (on average 9.0) internal successors, (45), 5 states have internal predecessors, (45), 3 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-23 02:19:38,565 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:19:45,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:45,485 INFO L93 Difference]: Finished difference Result 3232 states and 4850 transitions. [2021-11-23 02:19:45,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:19:45,486 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.0) internal successors, (45), 5 states have internal predecessors, (45), 3 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 3 states have call successors, (12) Word has length 80 [2021-11-23 02:19:45,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:45,505 INFO L225 Difference]: With dead ends: 3232 [2021-11-23 02:19:45,506 INFO L226 Difference]: Without dead ends: 1924 [2021-11-23 02:19:45,516 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:19:45,517 INFO L933 BasicCegarLoop]: 1590 mSDtfsCounter, 1422 mSDsluCounter, 2470 mSDsCounter, 0 mSdLazyCounter, 2195 mSolverCounterSat, 9 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1423 SdHoareTripleChecker+Valid, 3865 SdHoareTripleChecker+Invalid, 2205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 2195 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:45,518 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1423 Valid, 3865 Invalid, 2205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 2195 Invalid, 1 Unknown, 0 Unchecked, 9.5s Time] [2021-11-23 02:19:45,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1924 states. [2021-11-23 02:19:45,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1924 to 1911. [2021-11-23 02:19:45,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1911 states, 1229 states have (on average 1.385679414157852) internal successors, (1703), 1276 states have internal predecessors, (1703), 577 states have call successors, (577), 104 states have call predecessors, (577), 104 states have return successors, (577), 554 states have call predecessors, (577), 576 states have call successors, (577) [2021-11-23 02:19:45,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1911 states to 1911 states and 2857 transitions. [2021-11-23 02:19:45,678 INFO L78 Accepts]: Start accepts. Automaton has 1911 states and 2857 transitions. Word has length 80 [2021-11-23 02:19:45,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:45,679 INFO L470 AbstractCegarLoop]: Abstraction has 1911 states and 2857 transitions. [2021-11-23 02:19:45,679 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.0) internal successors, (45), 5 states have internal predecessors, (45), 3 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-23 02:19:45,680 INFO L276 IsEmpty]: Start isEmpty. Operand 1911 states and 2857 transitions. [2021-11-23 02:19:45,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 02:19:45,683 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:45,683 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:19:45,726 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:19:45,906 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:19:45,907 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:45,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:45,907 INFO L85 PathProgramCache]: Analyzing trace with hash 1661378565, now seen corresponding path program 1 times [2021-11-23 02:19:45,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:45,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565461820] [2021-11-23 02:19:45,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:45,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:46,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:46,372 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 02:19:46,372 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:46,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565461820] [2021-11-23 02:19:46,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1565461820] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:46,373 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:46,373 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:19:46,373 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431140237] [2021-11-23 02:19:46,373 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:46,374 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:19:46,374 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:46,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:19:46,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:19:46,375 INFO L87 Difference]: Start difference. First operand 1911 states and 2857 transitions. Second operand has 6 states, 6 states have (on average 8.0) internal successors, (48), 6 states have internal predecessors, (48), 4 states have call successors, (14), 2 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-23 02:19:49,556 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:19:58,957 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:19:59,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:59,061 INFO L93 Difference]: Finished difference Result 3590 states and 5352 transitions. [2021-11-23 02:19:59,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:19:59,062 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.0) internal successors, (48), 6 states have internal predecessors, (48), 4 states have call successors, (14), 2 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 80 [2021-11-23 02:19:59,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:59,081 INFO L225 Difference]: With dead ends: 3590 [2021-11-23 02:19:59,081 INFO L226 Difference]: Without dead ends: 1681 [2021-11-23 02:19:59,096 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:19:59,097 INFO L933 BasicCegarLoop]: 1678 mSDtfsCounter, 2599 mSDsluCounter, 1370 mSDsCounter, 0 mSdLazyCounter, 2158 mSolverCounterSat, 384 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2599 SdHoareTripleChecker+Valid, 2899 SdHoareTripleChecker+Invalid, 2544 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 384 IncrementalHoareTripleChecker+Valid, 2158 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:59,098 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2599 Valid, 2899 Invalid, 2544 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [384 Valid, 2158 Invalid, 2 Unknown, 0 Unchecked, 12.3s Time] [2021-11-23 02:19:59,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1681 states. [2021-11-23 02:19:59,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1681 to 1675. [2021-11-23 02:19:59,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1675 states, 1080 states have (on average 1.3796296296296295) internal successors, (1490), 1119 states have internal predecessors, (1490), 496 states have call successors, (496), 98 states have call predecessors, (496), 98 states have return successors, (495), 477 states have call predecessors, (495), 495 states have call successors, (495) [2021-11-23 02:19:59,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1675 states to 1675 states and 2481 transitions. [2021-11-23 02:19:59,257 INFO L78 Accepts]: Start accepts. Automaton has 1675 states and 2481 transitions. Word has length 80 [2021-11-23 02:19:59,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:59,260 INFO L470 AbstractCegarLoop]: Abstraction has 1675 states and 2481 transitions. [2021-11-23 02:19:59,261 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.0) internal successors, (48), 6 states have internal predecessors, (48), 4 states have call successors, (14), 2 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-23 02:19:59,261 INFO L276 IsEmpty]: Start isEmpty. Operand 1675 states and 2481 transitions. [2021-11-23 02:19:59,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 02:19:59,265 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:59,265 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:19:59,266 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:19:59,266 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:59,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:59,267 INFO L85 PathProgramCache]: Analyzing trace with hash 1310077898, now seen corresponding path program 1 times [2021-11-23 02:19:59,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:59,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1920638156] [2021-11-23 02:19:59,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:59,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:59,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:59,805 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:19:59,805 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:59,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1920638156] [2021-11-23 02:19:59,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1920638156] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:59,806 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:59,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:19:59,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295679306] [2021-11-23 02:19:59,806 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:59,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:19:59,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:59,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:19:59,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:19:59,808 INFO L87 Difference]: Start difference. First operand 1675 states and 2481 transitions. Second operand has 6 states, 6 states have (on average 8.333333333333334) internal successors, (50), 6 states have internal predecessors, (50), 4 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-11-23 02:20:02,521 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:20:12,076 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:20:12,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:20:12,171 INFO L93 Difference]: Finished difference Result 3352 states and 4969 transitions. [2021-11-23 02:20:12,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:20:12,173 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.333333333333334) internal successors, (50), 6 states have internal predecessors, (50), 4 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) Word has length 79 [2021-11-23 02:20:12,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:20:12,191 INFO L225 Difference]: With dead ends: 3352 [2021-11-23 02:20:12,191 INFO L226 Difference]: Without dead ends: 1679 [2021-11-23 02:20:12,203 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:20:12,205 INFO L933 BasicCegarLoop]: 1674 mSDtfsCounter, 2705 mSDsluCounter, 1458 mSDsCounter, 0 mSdLazyCounter, 2312 mSolverCounterSat, 488 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2705 SdHoareTripleChecker+Valid, 2964 SdHoareTripleChecker+Invalid, 2802 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 488 IncrementalHoareTripleChecker+Valid, 2312 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:20:12,205 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2705 Valid, 2964 Invalid, 2802 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [488 Valid, 2312 Invalid, 2 Unknown, 0 Unchecked, 12.0s Time] [2021-11-23 02:20:12,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1679 states. [2021-11-23 02:20:12,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1679 to 1673. [2021-11-23 02:20:12,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1673 states, 1079 states have (on average 1.3790546802594996) internal successors, (1488), 1118 states have internal predecessors, (1488), 495 states have call successors, (495), 98 states have call predecessors, (495), 98 states have return successors, (494), 476 states have call predecessors, (494), 494 states have call successors, (494) [2021-11-23 02:20:12,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1673 states to 1673 states and 2477 transitions. [2021-11-23 02:20:12,349 INFO L78 Accepts]: Start accepts. Automaton has 1673 states and 2477 transitions. Word has length 79 [2021-11-23 02:20:12,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:20:12,350 INFO L470 AbstractCegarLoop]: Abstraction has 1673 states and 2477 transitions. [2021-11-23 02:20:12,350 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.333333333333334) internal successors, (50), 6 states have internal predecessors, (50), 4 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-11-23 02:20:12,350 INFO L276 IsEmpty]: Start isEmpty. Operand 1673 states and 2477 transitions. [2021-11-23 02:20:12,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 02:20:12,354 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:20:12,354 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:20:12,354 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:20:12,355 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:20:12,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:20:12,355 INFO L85 PathProgramCache]: Analyzing trace with hash 190548539, now seen corresponding path program 1 times [2021-11-23 02:20:12,356 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:20:12,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989804629] [2021-11-23 02:20:12,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:20:12,357 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:20:12,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:20:12,764 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 02:20:12,764 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:20:12,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989804629] [2021-11-23 02:20:12,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1989804629] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:20:12,765 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:20:12,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:20:12,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557684997] [2021-11-23 02:20:12,765 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:20:12,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:20:12,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:20:12,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:20:12,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:20:12,767 INFO L87 Difference]: Start difference. First operand 1673 states and 2477 transitions. Second operand has 5 states, 5 states have (on average 10.4) internal successors, (52), 5 states have internal predecessors, (52), 3 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:20:16,655 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:20:19,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:20:19,216 INFO L93 Difference]: Finished difference Result 3348 states and 4960 transitions. [2021-11-23 02:20:19,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:20:19,220 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.4) internal successors, (52), 5 states have internal predecessors, (52), 3 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 78 [2021-11-23 02:20:19,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:20:19,237 INFO L225 Difference]: With dead ends: 3348 [2021-11-23 02:20:19,237 INFO L226 Difference]: Without dead ends: 1677 [2021-11-23 02:20:19,247 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:20:19,249 INFO L933 BasicCegarLoop]: 1331 mSDtfsCounter, 1126 mSDsluCounter, 2983 mSDsCounter, 0 mSdLazyCounter, 809 mSolverCounterSat, 15 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1127 SdHoareTripleChecker+Valid, 4151 SdHoareTripleChecker+Invalid, 825 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 809 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:20:19,249 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1127 Valid, 4151 Invalid, 825 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 809 Invalid, 1 Unknown, 0 Unchecked, 6.3s Time] [2021-11-23 02:20:19,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1677 states. [2021-11-23 02:20:19,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1677 to 1671. [2021-11-23 02:20:19,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1671 states, 1078 states have (on average 1.3784786641929498) internal successors, (1486), 1117 states have internal predecessors, (1486), 494 states have call successors, (494), 98 states have call predecessors, (494), 98 states have return successors, (493), 475 states have call predecessors, (493), 493 states have call successors, (493) [2021-11-23 02:20:19,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1671 states to 1671 states and 2473 transitions. [2021-11-23 02:20:19,396 INFO L78 Accepts]: Start accepts. Automaton has 1671 states and 2473 transitions. Word has length 78 [2021-11-23 02:20:19,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:20:19,399 INFO L470 AbstractCegarLoop]: Abstraction has 1671 states and 2473 transitions. [2021-11-23 02:20:19,399 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.4) internal successors, (52), 5 states have internal predecessors, (52), 3 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:20:19,399 INFO L276 IsEmpty]: Start isEmpty. Operand 1671 states and 2473 transitions. [2021-11-23 02:20:19,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 02:20:19,410 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:20:19,410 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:20:19,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:20:19,411 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:20:19,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:20:19,412 INFO L85 PathProgramCache]: Analyzing trace with hash -1478969050, now seen corresponding path program 1 times [2021-11-23 02:20:19,412 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:20:19,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757121018] [2021-11-23 02:20:19,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:20:19,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:20:19,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:20:19,944 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:20:19,944 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:20:19,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757121018] [2021-11-23 02:20:19,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1757121018] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:20:19,945 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:20:19,945 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:20:19,945 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025012183] [2021-11-23 02:20:19,945 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:20:19,946 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:20:19,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:20:19,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:20:19,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:20:19,947 INFO L87 Difference]: Start difference. First operand 1671 states and 2473 transitions. Second operand has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 3 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:20:23,076 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:20:27,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:20:27,155 INFO L93 Difference]: Finished difference Result 3344 states and 4952 transitions. [2021-11-23 02:20:27,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:20:27,157 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 3 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 77 [2021-11-23 02:20:27,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:20:27,172 INFO L225 Difference]: With dead ends: 3344 [2021-11-23 02:20:27,173 INFO L226 Difference]: Without dead ends: 1675 [2021-11-23 02:20:27,183 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:20:27,184 INFO L933 BasicCegarLoop]: 1327 mSDtfsCounter, 1769 mSDsluCounter, 2188 mSDsCounter, 0 mSdLazyCounter, 638 mSolverCounterSat, 478 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1770 SdHoareTripleChecker+Valid, 3397 SdHoareTripleChecker+Invalid, 1117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 478 IncrementalHoareTripleChecker+Valid, 638 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:20:27,185 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1770 Valid, 3397 Invalid, 1117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [478 Valid, 638 Invalid, 1 Unknown, 0 Unchecked, 7.0s Time] [2021-11-23 02:20:27,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1675 states. [2021-11-23 02:20:27,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1675 to 1669. [2021-11-23 02:20:27,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1669 states, 1077 states have (on average 1.3779015784586814) internal successors, (1484), 1116 states have internal predecessors, (1484), 493 states have call successors, (493), 98 states have call predecessors, (493), 98 states have return successors, (492), 474 states have call predecessors, (492), 492 states have call successors, (492) [2021-11-23 02:20:27,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1669 states to 1669 states and 2469 transitions. [2021-11-23 02:20:27,327 INFO L78 Accepts]: Start accepts. Automaton has 1669 states and 2469 transitions. Word has length 77 [2021-11-23 02:20:27,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:20:27,327 INFO L470 AbstractCegarLoop]: Abstraction has 1669 states and 2469 transitions. [2021-11-23 02:20:27,328 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 3 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:20:27,328 INFO L276 IsEmpty]: Start isEmpty. Operand 1669 states and 2469 transitions. [2021-11-23 02:20:27,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-23 02:20:27,331 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:20:27,332 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:20:27,332 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 02:20:27,332 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:20:27,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:20:27,333 INFO L85 PathProgramCache]: Analyzing trace with hash -1518072327, now seen corresponding path program 1 times [2021-11-23 02:20:27,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:20:27,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342066711] [2021-11-23 02:20:27,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:20:27,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:20:27,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:20:27,903 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:20:27,903 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:20:27,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1342066711] [2021-11-23 02:20:27,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1342066711] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:20:27,904 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:20:27,904 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:20:27,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238941170] [2021-11-23 02:20:27,904 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:20:27,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:20:27,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:20:27,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:20:27,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:20:27,906 INFO L87 Difference]: Start difference. First operand 1669 states and 2469 transitions. Second operand has 6 states, 6 states have (on average 9.5) internal successors, (57), 6 states have internal predecessors, (57), 4 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-23 02:20:30,909 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:20:40,333 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:20:40,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:20:40,422 INFO L93 Difference]: Finished difference Result 3618 states and 5355 transitions. [2021-11-23 02:20:40,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:20:40,424 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.5) internal successors, (57), 6 states have internal predecessors, (57), 4 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 76 [2021-11-23 02:20:40,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:20:40,443 INFO L225 Difference]: With dead ends: 3618 [2021-11-23 02:20:40,443 INFO L226 Difference]: Without dead ends: 1951 [2021-11-23 02:20:40,455 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:20:40,456 INFO L933 BasicCegarLoop]: 1550 mSDtfsCounter, 2227 mSDsluCounter, 1143 mSDsCounter, 0 mSdLazyCounter, 1838 mSolverCounterSat, 254 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2227 SdHoareTripleChecker+Valid, 2554 SdHoareTripleChecker+Invalid, 2094 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 254 IncrementalHoareTripleChecker+Valid, 1838 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:20:40,456 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2227 Valid, 2554 Invalid, 2094 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [254 Valid, 1838 Invalid, 2 Unknown, 0 Unchecked, 12.2s Time] [2021-11-23 02:20:40,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1951 states. [2021-11-23 02:20:40,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1951 to 1940. [2021-11-23 02:20:40,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1940 states, 1256 states have (on average 1.375796178343949) internal successors, (1728), 1301 states have internal predecessors, (1728), 565 states have call successors, (565), 118 states have call predecessors, (565), 118 states have return successors, (564), 544 states have call predecessors, (564), 564 states have call successors, (564) [2021-11-23 02:20:40,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1940 states to 1940 states and 2857 transitions. [2021-11-23 02:20:40,637 INFO L78 Accepts]: Start accepts. Automaton has 1940 states and 2857 transitions. Word has length 76 [2021-11-23 02:20:40,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:20:40,638 INFO L470 AbstractCegarLoop]: Abstraction has 1940 states and 2857 transitions. [2021-11-23 02:20:40,638 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.5) internal successors, (57), 6 states have internal predecessors, (57), 4 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-23 02:20:40,638 INFO L276 IsEmpty]: Start isEmpty. Operand 1940 states and 2857 transitions. [2021-11-23 02:20:40,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-23 02:20:40,642 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:20:40,642 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:20:40,642 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 02:20:40,643 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:20:40,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:20:40,643 INFO L85 PathProgramCache]: Analyzing trace with hash 787739154, now seen corresponding path program 1 times [2021-11-23 02:20:40,644 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:20:40,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [580107050] [2021-11-23 02:20:40,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:20:40,644 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:20:40,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:20:41,216 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 02:20:41,216 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:20:41,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [580107050] [2021-11-23 02:20:41,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [580107050] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:20:41,217 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:20:41,217 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:20:41,217 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036514557] [2021-11-23 02:20:41,218 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:20:41,218 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:20:41,218 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:20:41,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:20:41,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:20:41,219 INFO L87 Difference]: Start difference. First operand 1940 states and 2857 transitions. Second operand has 5 states, 4 states have (on average 13.0) internal successors, (52), 5 states have internal predecessors, (52), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 02:20:44,047 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:20:49,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:20:49,063 INFO L93 Difference]: Finished difference Result 3880 states and 5718 transitions. [2021-11-23 02:20:49,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:20:49,064 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 13.0) internal successors, (52), 5 states have internal predecessors, (52), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) Word has length 74 [2021-11-23 02:20:49,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:20:49,079 INFO L225 Difference]: With dead ends: 3880 [2021-11-23 02:20:49,080 INFO L226 Difference]: Without dead ends: 1942 [2021-11-23 02:20:49,091 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:20:49,092 INFO L933 BasicCegarLoop]: 1571 mSDtfsCounter, 2711 mSDsluCounter, 885 mSDsCounter, 0 mSdLazyCounter, 1517 mSolverCounterSat, 577 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2711 SdHoareTripleChecker+Valid, 2351 SdHoareTripleChecker+Invalid, 2095 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 577 IncrementalHoareTripleChecker+Valid, 1517 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:20:49,093 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2711 Valid, 2351 Invalid, 2095 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [577 Valid, 1517 Invalid, 1 Unknown, 0 Unchecked, 7.6s Time] [2021-11-23 02:20:49,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1942 states. [2021-11-23 02:20:49,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1942 to 1940. [2021-11-23 02:20:49,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1940 states, 1256 states have (on average 1.375) internal successors, (1727), 1301 states have internal predecessors, (1727), 565 states have call successors, (565), 118 states have call predecessors, (565), 118 states have return successors, (564), 544 states have call predecessors, (564), 564 states have call successors, (564) [2021-11-23 02:20:49,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1940 states to 1940 states and 2856 transitions. [2021-11-23 02:20:49,274 INFO L78 Accepts]: Start accepts. Automaton has 1940 states and 2856 transitions. Word has length 74 [2021-11-23 02:20:49,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:20:49,274 INFO L470 AbstractCegarLoop]: Abstraction has 1940 states and 2856 transitions. [2021-11-23 02:20:49,275 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 13.0) internal successors, (52), 5 states have internal predecessors, (52), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 02:20:49,275 INFO L276 IsEmpty]: Start isEmpty. Operand 1940 states and 2856 transitions. [2021-11-23 02:20:49,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 02:20:49,278 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:20:49,279 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:20:49,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 02:20:49,279 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:20:49,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:20:49,280 INFO L85 PathProgramCache]: Analyzing trace with hash 1117875227, now seen corresponding path program 1 times [2021-11-23 02:20:49,280 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:20:49,281 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1589464372] [2021-11-23 02:20:49,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:20:49,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:20:49,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:20:49,735 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:20:49,735 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:20:49,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1589464372] [2021-11-23 02:20:49,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1589464372] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:20:49,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1729308874] [2021-11-23 02:20:49,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:20:49,736 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:20:49,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:20:49,742 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:20:49,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:20:50,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:20:50,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 1675 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:20:50,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:20:51,305 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:20:51,305 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:20:51,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1729308874] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:20:51,306 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:20:51,306 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 8 [2021-11-23 02:20:51,306 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387839668] [2021-11-23 02:20:51,306 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:20:51,307 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:20:51,307 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:20:51,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:20:51,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:20:51,307 INFO L87 Difference]: Start difference. First operand 1940 states and 2856 transitions. Second operand has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-23 02:20:54,276 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:20:59,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:20:59,831 INFO L93 Difference]: Finished difference Result 4399 states and 6487 transitions. [2021-11-23 02:20:59,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:20:59,837 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) Word has length 78 [2021-11-23 02:20:59,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:20:59,853 INFO L225 Difference]: With dead ends: 4399 [2021-11-23 02:20:59,854 INFO L226 Difference]: Without dead ends: 2461 [2021-11-23 02:20:59,862 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:20:59,864 INFO L933 BasicCegarLoop]: 1658 mSDtfsCounter, 934 mSDsluCounter, 2869 mSDsCounter, 0 mSdLazyCounter, 1753 mSolverCounterSat, 5 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 936 SdHoareTripleChecker+Valid, 4318 SdHoareTripleChecker+Invalid, 1759 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 1753 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:20:59,864 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [936 Valid, 4318 Invalid, 1759 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 1753 Invalid, 1 Unknown, 0 Unchecked, 8.3s Time] [2021-11-23 02:20:59,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2461 states. [2021-11-23 02:21:00,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2461 to 2438. [2021-11-23 02:21:00,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2438 states, 1579 states have (on average 1.376187460417986) internal successors, (2173), 1635 states have internal predecessors, (2173), 711 states have call successors, (711), 146 states have call predecessors, (711), 147 states have return successors, (711), 686 states have call predecessors, (711), 710 states have call successors, (711) [2021-11-23 02:21:00,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2438 states to 2438 states and 3595 transitions. [2021-11-23 02:21:00,117 INFO L78 Accepts]: Start accepts. Automaton has 2438 states and 3595 transitions. Word has length 78 [2021-11-23 02:21:00,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:21:00,117 INFO L470 AbstractCegarLoop]: Abstraction has 2438 states and 3595 transitions. [2021-11-23 02:21:00,118 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-23 02:21:00,118 INFO L276 IsEmpty]: Start isEmpty. Operand 2438 states and 3595 transitions. [2021-11-23 02:21:00,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 02:21:00,121 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:21:00,121 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:21:00,172 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-23 02:21:00,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:21:00,335 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:21:00,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:21:00,335 INFO L85 PathProgramCache]: Analyzing trace with hash -158304153, now seen corresponding path program 1 times [2021-11-23 02:21:00,335 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:21:00,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [788081691] [2021-11-23 02:21:00,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:21:00,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:21:00,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:21:00,749 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:21:00,749 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:21:00,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [788081691] [2021-11-23 02:21:00,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [788081691] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:21:00,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2123957647] [2021-11-23 02:21:00,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:21:00,750 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:21:00,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:21:00,755 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:21:00,760 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:21:01,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:21:01,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 1695 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:21:01,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:21:02,195 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:21:02,195 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:21:02,195 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2123957647] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:21:02,196 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:21:02,196 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-11-23 02:21:02,196 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226297277] [2021-11-23 02:21:02,196 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:21:02,196 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:21:02,197 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:21:02,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:21:02,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:21:02,198 INFO L87 Difference]: Start difference. First operand 2438 states and 3595 transitions. Second operand has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:21:04,880 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:21:10,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:21:10,554 INFO L93 Difference]: Finished difference Result 5386 states and 7960 transitions. [2021-11-23 02:21:10,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:21:10,555 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) Word has length 84 [2021-11-23 02:21:10,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:21:10,576 INFO L225 Difference]: With dead ends: 5386 [2021-11-23 02:21:10,576 INFO L226 Difference]: Without dead ends: 2950 [2021-11-23 02:21:10,586 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:21:10,587 INFO L933 BasicCegarLoop]: 1360 mSDtfsCounter, 2228 mSDsluCounter, 1305 mSDsCounter, 0 mSdLazyCounter, 1275 mSolverCounterSat, 617 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2230 SdHoareTripleChecker+Valid, 2549 SdHoareTripleChecker+Invalid, 1893 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 617 IncrementalHoareTripleChecker+Valid, 1275 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:21:10,588 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2230 Valid, 2549 Invalid, 1893 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [617 Valid, 1275 Invalid, 1 Unknown, 0 Unchecked, 8.1s Time] [2021-11-23 02:21:10,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2950 states. [2021-11-23 02:21:10,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2950 to 2926. [2021-11-23 02:21:10,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2926 states, 1897 states have (on average 1.3763837638376384) internal successors, (2611), 1964 states have internal predecessors, (2611), 852 states have call successors, (852), 174 states have call predecessors, (852), 176 states have return successors, (853), 823 states have call predecessors, (853), 851 states have call successors, (853) [2021-11-23 02:21:10,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2926 states to 2926 states and 4316 transitions. [2021-11-23 02:21:10,902 INFO L78 Accepts]: Start accepts. Automaton has 2926 states and 4316 transitions. Word has length 84 [2021-11-23 02:21:10,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:21:10,903 INFO L470 AbstractCegarLoop]: Abstraction has 2926 states and 4316 transitions. [2021-11-23 02:21:10,904 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:21:10,904 INFO L276 IsEmpty]: Start isEmpty. Operand 2926 states and 4316 transitions. [2021-11-23 02:21:10,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 02:21:10,907 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:21:10,908 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:21:10,954 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:21:11,126 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:21:11,127 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:21:11,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:21:11,127 INFO L85 PathProgramCache]: Analyzing trace with hash 204924411, now seen corresponding path program 1 times [2021-11-23 02:21:11,127 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:21:11,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1568062496] [2021-11-23 02:21:11,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:21:11,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:21:11,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:21:11,500 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:21:11,500 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:21:11,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1568062496] [2021-11-23 02:21:11,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1568062496] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:21:11,501 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:21:11,501 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:21:11,501 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149132897] [2021-11-23 02:21:11,501 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:21:11,502 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:21:11,502 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:21:11,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:21:11,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:21:11,503 INFO L87 Difference]: Start difference. First operand 2926 states and 4316 transitions. Second operand has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 3 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:21:14,272 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:21:21,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:21:21,168 INFO L93 Difference]: Finished difference Result 5361 states and 7908 transitions. [2021-11-23 02:21:21,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:21:21,170 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 3 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 86 [2021-11-23 02:21:21,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:21:21,184 INFO L225 Difference]: With dead ends: 5361 [2021-11-23 02:21:21,184 INFO L226 Difference]: Without dead ends: 2437 [2021-11-23 02:21:21,194 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:21:21,195 INFO L933 BasicCegarLoop]: 1565 mSDtfsCounter, 3041 mSDsluCounter, 880 mSDsCounter, 0 mSdLazyCounter, 1530 mSolverCounterSat, 807 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3041 SdHoareTripleChecker+Valid, 2341 SdHoareTripleChecker+Invalid, 2338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 807 IncrementalHoareTripleChecker+Valid, 1530 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:21:21,195 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3041 Valid, 2341 Invalid, 2338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [807 Valid, 1530 Invalid, 1 Unknown, 0 Unchecked, 9.4s Time] [2021-11-23 02:21:21,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2437 states. [2021-11-23 02:21:21,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2437 to 2428. [2021-11-23 02:21:21,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2428 states, 1574 states have (on average 1.3742058449809402) internal successors, (2163), 1630 states have internal predecessors, (2163), 706 states have call successors, (706), 146 states have call predecessors, (706), 147 states have return successors, (706), 681 states have call predecessors, (706), 705 states have call successors, (706) [2021-11-23 02:21:21,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2428 states to 2428 states and 3575 transitions. [2021-11-23 02:21:21,472 INFO L78 Accepts]: Start accepts. Automaton has 2428 states and 3575 transitions. Word has length 86 [2021-11-23 02:21:21,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:21:21,475 INFO L470 AbstractCegarLoop]: Abstraction has 2428 states and 3575 transitions. [2021-11-23 02:21:21,475 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 3 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:21:21,475 INFO L276 IsEmpty]: Start isEmpty. Operand 2428 states and 3575 transitions. [2021-11-23 02:21:21,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-23 02:21:21,480 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:21:21,480 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:21:21,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 02:21:21,481 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:21:21,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:21:21,483 INFO L85 PathProgramCache]: Analyzing trace with hash -1912346181, now seen corresponding path program 1 times [2021-11-23 02:21:21,483 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:21:21,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [766092855] [2021-11-23 02:21:21,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:21:21,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:21:21,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:21:21,901 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:21:21,901 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:21:21,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [766092855] [2021-11-23 02:21:21,901 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [766092855] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:21:21,901 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:21:21,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:21:21,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559759242] [2021-11-23 02:21:21,902 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:21:21,902 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:21:21,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:21:21,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:21:21,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:21:21,903 INFO L87 Difference]: Start difference. First operand 2428 states and 3575 transitions. Second operand has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 4 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-23 02:21:24,707 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:21:35,088 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:21:35,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:21:35,248 INFO L93 Difference]: Finished difference Result 4859 states and 7158 transitions. [2021-11-23 02:21:35,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:21:35,251 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 4 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 88 [2021-11-23 02:21:35,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:21:35,267 INFO L225 Difference]: With dead ends: 4859 [2021-11-23 02:21:35,267 INFO L226 Difference]: Without dead ends: 2433 [2021-11-23 02:21:35,276 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:21:35,277 INFO L933 BasicCegarLoop]: 1542 mSDtfsCounter, 2223 mSDsluCounter, 1137 mSDsCounter, 0 mSdLazyCounter, 1834 mSolverCounterSat, 249 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2223 SdHoareTripleChecker+Valid, 2540 SdHoareTripleChecker+Invalid, 2085 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 249 IncrementalHoareTripleChecker+Valid, 1834 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:21:35,278 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2223 Valid, 2540 Invalid, 2085 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [249 Valid, 1834 Invalid, 2 Unknown, 0 Unchecked, 13.0s Time] [2021-11-23 02:21:35,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2433 states. [2021-11-23 02:21:35,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2433 to 2424. [2021-11-23 02:21:35,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2424 states, 1572 states have (on average 1.373409669211196) internal successors, (2159), 1628 states have internal predecessors, (2159), 704 states have call successors, (704), 146 states have call predecessors, (704), 147 states have return successors, (704), 679 states have call predecessors, (704), 703 states have call successors, (704) [2021-11-23 02:21:35,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2424 states to 2424 states and 3567 transitions. [2021-11-23 02:21:35,472 INFO L78 Accepts]: Start accepts. Automaton has 2424 states and 3567 transitions. Word has length 88 [2021-11-23 02:21:35,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:21:35,473 INFO L470 AbstractCegarLoop]: Abstraction has 2424 states and 3567 transitions. [2021-11-23 02:21:35,473 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 4 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-23 02:21:35,473 INFO L276 IsEmpty]: Start isEmpty. Operand 2424 states and 3567 transitions. [2021-11-23 02:21:35,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-23 02:21:35,476 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:21:35,476 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:21:35,477 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 02:21:35,477 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:21:35,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:21:35,477 INFO L85 PathProgramCache]: Analyzing trace with hash 682217123, now seen corresponding path program 1 times [2021-11-23 02:21:35,478 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:21:35,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625631086] [2021-11-23 02:21:35,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:21:35,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:21:35,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:21:35,867 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:21:35,868 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:21:35,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625631086] [2021-11-23 02:21:35,868 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625631086] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:21:35,868 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:21:35,868 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:21:35,868 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201244617] [2021-11-23 02:21:35,869 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:21:35,869 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:21:35,869 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:21:35,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:21:35,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:21:35,870 INFO L87 Difference]: Start difference. First operand 2424 states and 3567 transitions. Second operand has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 4 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-23 02:21:38,847 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:21:48,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:21:48,009 INFO L93 Difference]: Finished difference Result 4354 states and 6407 transitions. [2021-11-23 02:21:48,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:21:48,011 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 4 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 89 [2021-11-23 02:21:48,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:21:48,024 INFO L225 Difference]: With dead ends: 4354 [2021-11-23 02:21:48,024 INFO L226 Difference]: Without dead ends: 1932 [2021-11-23 02:21:48,033 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:21:48,034 INFO L933 BasicCegarLoop]: 1655 mSDtfsCounter, 2754 mSDsluCounter, 1511 mSDsCounter, 0 mSdLazyCounter, 2370 mSolverCounterSat, 542 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2754 SdHoareTripleChecker+Valid, 2993 SdHoareTripleChecker+Invalid, 2913 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 542 IncrementalHoareTripleChecker+Valid, 2370 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:21:48,034 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2754 Valid, 2993 Invalid, 2913 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [542 Valid, 2370 Invalid, 1 Unknown, 0 Unchecked, 11.8s Time] [2021-11-23 02:21:48,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1932 states. [2021-11-23 02:21:48,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1932 to 1923. [2021-11-23 02:21:48,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1923 states, 1247 states have (on average 1.3688853247794708) internal successors, (1707), 1292 states have internal predecessors, (1707), 557 states have call successors, (557), 118 states have call predecessors, (557), 118 states have return successors, (556), 536 states have call predecessors, (556), 556 states have call successors, (556) [2021-11-23 02:21:48,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1923 states to 1923 states and 2820 transitions. [2021-11-23 02:21:48,179 INFO L78 Accepts]: Start accepts. Automaton has 1923 states and 2820 transitions. Word has length 89 [2021-11-23 02:21:48,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:21:48,180 INFO L470 AbstractCegarLoop]: Abstraction has 1923 states and 2820 transitions. [2021-11-23 02:21:48,180 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 4 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-23 02:21:48,180 INFO L276 IsEmpty]: Start isEmpty. Operand 1923 states and 2820 transitions. [2021-11-23 02:21:48,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-23 02:21:48,183 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:21:48,183 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:21:48,184 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 02:21:48,184 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:21:48,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:21:48,185 INFO L85 PathProgramCache]: Analyzing trace with hash -1393221259, now seen corresponding path program 1 times [2021-11-23 02:21:48,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:21:48,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918706581] [2021-11-23 02:21:48,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:21:48,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:21:48,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:21:48,636 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:21:48,636 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:21:48,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918706581] [2021-11-23 02:21:48,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [918706581] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:21:48,636 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:21:48,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:21:48,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201124794] [2021-11-23 02:21:48,637 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:21:48,637 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:21:48,637 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:21:48,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:21:48,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:21:48,638 INFO L87 Difference]: Start difference. First operand 1923 states and 2820 transitions. Second operand has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 3 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:21:51,475 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:21:59,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:21:59,844 INFO L93 Difference]: Finished difference Result 3853 states and 5652 transitions. [2021-11-23 02:21:59,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:21:59,847 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 3 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 90 [2021-11-23 02:21:59,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:21:59,857 INFO L225 Difference]: With dead ends: 3853 [2021-11-23 02:21:59,858 INFO L226 Difference]: Without dead ends: 1932 [2021-11-23 02:21:59,864 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:21:59,865 INFO L933 BasicCegarLoop]: 1548 mSDtfsCounter, 2231 mSDsluCounter, 1129 mSDsCounter, 0 mSdLazyCounter, 1863 mSolverCounterSat, 237 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2231 SdHoareTripleChecker+Valid, 2534 SdHoareTripleChecker+Invalid, 2101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 237 IncrementalHoareTripleChecker+Valid, 1863 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:21:59,865 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2231 Valid, 2534 Invalid, 2101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [237 Valid, 1863 Invalid, 1 Unknown, 0 Unchecked, 11.0s Time] [2021-11-23 02:21:59,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1932 states. [2021-11-23 02:21:59,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1932 to 1923. [2021-11-23 02:21:59,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1923 states, 1247 states have (on average 1.368083400160385) internal successors, (1706), 1292 states have internal predecessors, (1706), 557 states have call successors, (557), 118 states have call predecessors, (557), 118 states have return successors, (556), 536 states have call predecessors, (556), 556 states have call successors, (556) [2021-11-23 02:21:59,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1923 states to 1923 states and 2819 transitions. [2021-11-23 02:21:59,975 INFO L78 Accepts]: Start accepts. Automaton has 1923 states and 2819 transitions. Word has length 90 [2021-11-23 02:21:59,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:21:59,976 INFO L470 AbstractCegarLoop]: Abstraction has 1923 states and 2819 transitions. [2021-11-23 02:21:59,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 3 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:21:59,977 INFO L276 IsEmpty]: Start isEmpty. Operand 1923 states and 2819 transitions. [2021-11-23 02:21:59,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-23 02:21:59,981 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:21:59,981 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:21:59,982 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-23 02:21:59,982 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:21:59,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:21:59,983 INFO L85 PathProgramCache]: Analyzing trace with hash 1904918949, now seen corresponding path program 1 times [2021-11-23 02:21:59,983 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:21:59,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [384234666] [2021-11-23 02:21:59,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:21:59,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:22:00,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:22:00,460 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:22:00,460 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:22:00,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [384234666] [2021-11-23 02:22:00,461 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [384234666] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:22:00,461 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:22:00,461 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:22:00,461 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713945664] [2021-11-23 02:22:00,461 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:22:00,462 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:22:00,462 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:22:00,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:22:00,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:22:00,463 INFO L87 Difference]: Start difference. First operand 1923 states and 2819 transitions. Second operand has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 4 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-11-23 02:22:03,444 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:22:15,148 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:22:15,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:22:15,265 INFO L93 Difference]: Finished difference Result 3849 states and 5646 transitions. [2021-11-23 02:22:15,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:22:15,267 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 4 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) Word has length 92 [2021-11-23 02:22:15,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:22:15,276 INFO L225 Difference]: With dead ends: 3849 [2021-11-23 02:22:15,276 INFO L226 Difference]: Without dead ends: 1928 [2021-11-23 02:22:15,281 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:22:15,282 INFO L933 BasicCegarLoop]: 1533 mSDtfsCounter, 2213 mSDsluCounter, 1132 mSDsCounter, 0 mSdLazyCounter, 1830 mSolverCounterSat, 250 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2213 SdHoareTripleChecker+Valid, 2526 SdHoareTripleChecker+Invalid, 2082 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 250 IncrementalHoareTripleChecker+Valid, 1830 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:22:15,283 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2213 Valid, 2526 Invalid, 2082 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [250 Valid, 1830 Invalid, 2 Unknown, 0 Unchecked, 14.5s Time] [2021-11-23 02:22:15,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1928 states. [2021-11-23 02:22:15,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1928 to 1919. [2021-11-23 02:22:15,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1919 states, 1245 states have (on average 1.3670682730923696) internal successors, (1702), 1290 states have internal predecessors, (1702), 555 states have call successors, (555), 118 states have call predecessors, (555), 118 states have return successors, (554), 534 states have call predecessors, (554), 554 states have call successors, (554) [2021-11-23 02:22:15,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1919 states to 1919 states and 2811 transitions. [2021-11-23 02:22:15,461 INFO L78 Accepts]: Start accepts. Automaton has 1919 states and 2811 transitions. Word has length 92 [2021-11-23 02:22:15,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:22:15,461 INFO L470 AbstractCegarLoop]: Abstraction has 1919 states and 2811 transitions. [2021-11-23 02:22:15,462 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 4 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-11-23 02:22:15,462 INFO L276 IsEmpty]: Start isEmpty. Operand 1919 states and 2811 transitions. [2021-11-23 02:22:15,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-23 02:22:15,465 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:22:15,465 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:22:15,466 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-23 02:22:15,466 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:22:15,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:22:15,467 INFO L85 PathProgramCache]: Analyzing trace with hash 410147597, now seen corresponding path program 1 times [2021-11-23 02:22:15,467 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:22:15,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664202384] [2021-11-23 02:22:15,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:22:15,468 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:22:15,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:22:15,861 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:22:15,861 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:22:15,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664202384] [2021-11-23 02:22:15,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1664202384] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:22:15,862 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:22:15,862 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:22:15,862 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435172987] [2021-11-23 02:22:15,862 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:22:15,863 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:22:15,863 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:22:15,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:22:15,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:22:15,864 INFO L87 Difference]: Start difference. First operand 1919 states and 2811 transitions. Second operand has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 3 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:22:19,200 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:22:22,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:22:22,994 INFO L93 Difference]: Finished difference Result 3845 states and 5633 transitions. [2021-11-23 02:22:22,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:22:22,999 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 3 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 93 [2021-11-23 02:22:22,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:22:23,008 INFO L225 Difference]: With dead ends: 3845 [2021-11-23 02:22:23,009 INFO L226 Difference]: Without dead ends: 1928 [2021-11-23 02:22:23,013 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:22:23,014 INFO L933 BasicCegarLoop]: 1353 mSDtfsCounter, 880 mSDsluCounter, 2587 mSDsCounter, 0 mSdLazyCounter, 576 mSolverCounterSat, 230 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 880 SdHoareTripleChecker+Valid, 3795 SdHoareTripleChecker+Invalid, 807 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 230 IncrementalHoareTripleChecker+Valid, 576 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:22:23,014 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [880 Valid, 3795 Invalid, 807 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [230 Valid, 576 Invalid, 1 Unknown, 0 Unchecked, 7.0s Time] [2021-11-23 02:22:23,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1928 states. [2021-11-23 02:22:23,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1928 to 1919. [2021-11-23 02:22:23,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1919 states, 1245 states have (on average 1.3662650602409638) internal successors, (1701), 1290 states have internal predecessors, (1701), 555 states have call successors, (555), 118 states have call predecessors, (555), 118 states have return successors, (554), 534 states have call predecessors, (554), 554 states have call successors, (554) [2021-11-23 02:22:23,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1919 states to 1919 states and 2810 transitions. [2021-11-23 02:22:23,141 INFO L78 Accepts]: Start accepts. Automaton has 1919 states and 2810 transitions. Word has length 93 [2021-11-23 02:22:23,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:22:23,142 INFO L470 AbstractCegarLoop]: Abstraction has 1919 states and 2810 transitions. [2021-11-23 02:22:23,142 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 3 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:22:23,143 INFO L276 IsEmpty]: Start isEmpty. Operand 1919 states and 2810 transitions. [2021-11-23 02:22:23,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 02:22:23,146 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:22:23,146 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:22:23,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-23 02:22:23,147 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:22:23,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:22:23,147 INFO L85 PathProgramCache]: Analyzing trace with hash 1674968097, now seen corresponding path program 1 times [2021-11-23 02:22:23,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:22:23,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426700704] [2021-11-23 02:22:23,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:22:23,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:22:23,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:22:23,568 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:22:23,568 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:22:23,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426700704] [2021-11-23 02:22:23,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1426700704] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:22:23,569 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:22:23,569 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:22:23,569 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699923383] [2021-11-23 02:22:23,569 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:22:23,569 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:22:23,570 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:22:23,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:22:23,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:22:23,570 INFO L87 Difference]: Start difference. First operand 1919 states and 2810 transitions. Second operand has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 3 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-23 02:22:27,246 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:22:30,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:22:30,798 INFO L93 Difference]: Finished difference Result 3845 states and 5631 transitions. [2021-11-23 02:22:30,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:22:30,804 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 3 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 95 [2021-11-23 02:22:30,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:22:30,811 INFO L225 Difference]: With dead ends: 3845 [2021-11-23 02:22:30,812 INFO L226 Difference]: Without dead ends: 1928 [2021-11-23 02:22:30,816 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:22:30,817 INFO L933 BasicCegarLoop]: 1352 mSDtfsCounter, 552 mSDsluCounter, 3749 mSDsCounter, 0 mSdLazyCounter, 817 mSolverCounterSat, 17 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 552 SdHoareTripleChecker+Valid, 4890 SdHoareTripleChecker+Invalid, 835 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 817 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:22:30,818 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [552 Valid, 4890 Invalid, 835 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 817 Invalid, 1 Unknown, 0 Unchecked, 7.1s Time] [2021-11-23 02:22:30,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1928 states. [2021-11-23 02:22:30,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1928 to 1919. [2021-11-23 02:22:30,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1919 states, 1245 states have (on average 1.3654618473895583) internal successors, (1700), 1290 states have internal predecessors, (1700), 555 states have call successors, (555), 118 states have call predecessors, (555), 118 states have return successors, (554), 534 states have call predecessors, (554), 554 states have call successors, (554) [2021-11-23 02:22:30,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1919 states to 1919 states and 2809 transitions. [2021-11-23 02:22:30,955 INFO L78 Accepts]: Start accepts. Automaton has 1919 states and 2809 transitions. Word has length 95 [2021-11-23 02:22:30,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:22:30,955 INFO L470 AbstractCegarLoop]: Abstraction has 1919 states and 2809 transitions. [2021-11-23 02:22:30,955 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 3 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-23 02:22:30,956 INFO L276 IsEmpty]: Start isEmpty. Operand 1919 states and 2809 transitions. [2021-11-23 02:22:30,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-23 02:22:30,958 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:22:30,959 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:22:30,959 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-23 02:22:30,959 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:22:30,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:22:30,960 INFO L85 PathProgramCache]: Analyzing trace with hash -205699203, now seen corresponding path program 1 times [2021-11-23 02:22:30,960 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:22:30,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1498476992] [2021-11-23 02:22:30,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:22:30,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:22:31,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:22:31,407 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 02:22:31,407 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:22:31,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1498476992] [2021-11-23 02:22:31,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1498476992] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:22:31,407 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:22:31,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:22:31,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199508058] [2021-11-23 02:22:31,408 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:22:31,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:22:31,408 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:22:31,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:22:31,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:22:31,409 INFO L87 Difference]: Start difference. First operand 1919 states and 2809 transitions. Second operand has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 4 states have call successors, (15), 2 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-23 02:22:34,277 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:22:45,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:22:45,365 INFO L93 Difference]: Finished difference Result 3841 states and 5626 transitions. [2021-11-23 02:22:45,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:22:45,367 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 4 states have call successors, (15), 2 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) Word has length 97 [2021-11-23 02:22:45,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:22:45,375 INFO L225 Difference]: With dead ends: 3841 [2021-11-23 02:22:45,375 INFO L226 Difference]: Without dead ends: 1924 [2021-11-23 02:22:45,380 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:22:45,381 INFO L933 BasicCegarLoop]: 1645 mSDtfsCounter, 2013 mSDsluCounter, 1855 mSDsCounter, 0 mSdLazyCounter, 2823 mSolverCounterSat, 21 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2013 SdHoareTripleChecker+Valid, 3281 SdHoareTripleChecker+Invalid, 2845 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 2823 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:22:45,382 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2013 Valid, 3281 Invalid, 2845 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 2823 Invalid, 1 Unknown, 0 Unchecked, 13.7s Time] [2021-11-23 02:22:45,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1924 states. [2021-11-23 02:22:45,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1924 to 1915. [2021-11-23 02:22:45,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1915 states, 1243 states have (on average 1.3644408688656475) internal successors, (1696), 1288 states have internal predecessors, (1696), 553 states have call successors, (553), 118 states have call predecessors, (553), 118 states have return successors, (552), 532 states have call predecessors, (552), 552 states have call successors, (552) [2021-11-23 02:22:45,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1915 states to 1915 states and 2801 transitions. [2021-11-23 02:22:45,490 INFO L78 Accepts]: Start accepts. Automaton has 1915 states and 2801 transitions. Word has length 97 [2021-11-23 02:22:45,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:22:45,491 INFO L470 AbstractCegarLoop]: Abstraction has 1915 states and 2801 transitions. [2021-11-23 02:22:45,491 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 4 states have call successors, (15), 2 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-23 02:22:45,491 INFO L276 IsEmpty]: Start isEmpty. Operand 1915 states and 2801 transitions. [2021-11-23 02:22:45,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-23 02:22:45,494 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:22:45,494 INFO L514 BasicCegarLoop]: trace histogram [5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:22:45,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-23 02:22:45,495 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:22:45,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:22:45,495 INFO L85 PathProgramCache]: Analyzing trace with hash 861235227, now seen corresponding path program 1 times [2021-11-23 02:22:45,496 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:22:45,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1431931213] [2021-11-23 02:22:45,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:22:45,496 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:22:45,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:22:45,872 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 02:22:45,872 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:22:45,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1431931213] [2021-11-23 02:22:45,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1431931213] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:22:45,872 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:22:45,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:22:45,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703943545] [2021-11-23 02:22:45,873 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:22:45,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:22:45,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:22:45,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:22:45,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:22:45,874 INFO L87 Difference]: Start difference. First operand 1915 states and 2801 transitions. Second operand has 5 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:22:48,586 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:22:51,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:22:51,762 INFO L93 Difference]: Finished difference Result 3834 states and 5609 transitions. [2021-11-23 02:22:51,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:22:51,767 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 98 [2021-11-23 02:22:51,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:22:51,777 INFO L225 Difference]: With dead ends: 3834 [2021-11-23 02:22:51,777 INFO L226 Difference]: Without dead ends: 1921 [2021-11-23 02:22:51,783 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:22:51,784 INFO L933 BasicCegarLoop]: 1318 mSDtfsCounter, 1278 mSDsluCounter, 2390 mSDsCounter, 0 mSdLazyCounter, 726 mSolverCounterSat, 14 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1279 SdHoareTripleChecker+Valid, 3557 SdHoareTripleChecker+Invalid, 741 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 726 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:22:51,784 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1279 Valid, 3557 Invalid, 741 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 726 Invalid, 1 Unknown, 0 Unchecked, 5.7s Time] [2021-11-23 02:22:51,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1921 states. [2021-11-23 02:22:51,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1921 to 1913. [2021-11-23 02:22:51,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1913 states, 1242 states have (on average 1.3639291465378423) internal successors, (1694), 1287 states have internal predecessors, (1694), 552 states have call successors, (552), 118 states have call predecessors, (552), 118 states have return successors, (551), 531 states have call predecessors, (551), 551 states have call successors, (551) [2021-11-23 02:22:51,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1913 states to 1913 states and 2797 transitions. [2021-11-23 02:22:51,907 INFO L78 Accepts]: Start accepts. Automaton has 1913 states and 2797 transitions. Word has length 98 [2021-11-23 02:22:51,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:22:51,908 INFO L470 AbstractCegarLoop]: Abstraction has 1913 states and 2797 transitions. [2021-11-23 02:22:51,908 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:22:51,908 INFO L276 IsEmpty]: Start isEmpty. Operand 1913 states and 2797 transitions. [2021-11-23 02:22:51,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-23 02:22:51,911 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:22:51,911 INFO L514 BasicCegarLoop]: trace histogram [5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:22:51,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-23 02:22:51,912 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:22:51,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:22:51,912 INFO L85 PathProgramCache]: Analyzing trace with hash 870766709, now seen corresponding path program 1 times [2021-11-23 02:22:51,913 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:22:51,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998015825] [2021-11-23 02:22:51,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:22:51,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:22:52,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:22:52,289 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 02:22:52,289 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:22:52,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [998015825] [2021-11-23 02:22:52,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [998015825] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:22:52,290 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:22:52,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:22:52,290 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974629077] [2021-11-23 02:22:52,290 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:22:52,290 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:22:52,291 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:22:52,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:22:52,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:22:52,291 INFO L87 Difference]: Start difference. First operand 1913 states and 2797 transitions. Second operand has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:22:55,141 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:23:01,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:23:01,404 INFO L93 Difference]: Finished difference Result 3830 states and 5601 transitions. [2021-11-23 02:23:01,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:23:01,407 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 99 [2021-11-23 02:23:01,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:23:01,418 INFO L225 Difference]: With dead ends: 3830 [2021-11-23 02:23:01,418 INFO L226 Difference]: Without dead ends: 1919 [2021-11-23 02:23:01,423 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:23:01,424 INFO L933 BasicCegarLoop]: 1440 mSDtfsCounter, 1946 mSDsluCounter, 2183 mSDsCounter, 0 mSdLazyCounter, 661 mSolverCounterSat, 525 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1948 SdHoareTripleChecker+Valid, 3494 SdHoareTripleChecker+Invalid, 1187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 525 IncrementalHoareTripleChecker+Valid, 661 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:23:01,424 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1948 Valid, 3494 Invalid, 1187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [525 Valid, 661 Invalid, 1 Unknown, 0 Unchecked, 8.9s Time] [2021-11-23 02:23:01,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1919 states. [2021-11-23 02:23:01,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1919 to 1911. [2021-11-23 02:23:01,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1911 states, 1241 states have (on average 1.3634165995165188) internal successors, (1692), 1286 states have internal predecessors, (1692), 551 states have call successors, (551), 118 states have call predecessors, (551), 118 states have return successors, (550), 530 states have call predecessors, (550), 550 states have call successors, (550) [2021-11-23 02:23:01,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1911 states to 1911 states and 2793 transitions. [2021-11-23 02:23:01,547 INFO L78 Accepts]: Start accepts. Automaton has 1911 states and 2793 transitions. Word has length 99 [2021-11-23 02:23:01,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:23:01,547 INFO L470 AbstractCegarLoop]: Abstraction has 1911 states and 2793 transitions. [2021-11-23 02:23:01,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:23:01,548 INFO L276 IsEmpty]: Start isEmpty. Operand 1911 states and 2793 transitions. [2021-11-23 02:23:01,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 02:23:01,551 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:23:01,551 INFO L514 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:23:01,552 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-23 02:23:01,552 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:23:01,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:23:01,552 INFO L85 PathProgramCache]: Analyzing trace with hash -1379848427, now seen corresponding path program 1 times [2021-11-23 02:23:01,553 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:23:01,553 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966339232] [2021-11-23 02:23:01,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:01,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:23:01,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:01,927 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 02:23:01,927 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:23:01,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966339232] [2021-11-23 02:23:01,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [966339232] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:23:01,927 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:23:01,927 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:23:01,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282396747] [2021-11-23 02:23:01,928 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:23:01,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:23:01,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:23:01,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:23:01,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:23:01,929 INFO L87 Difference]: Start difference. First operand 1911 states and 2793 transitions. Second operand has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:23:04,727 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:23:11,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:23:11,019 INFO L93 Difference]: Finished difference Result 3826 states and 5593 transitions. [2021-11-23 02:23:11,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:23:11,024 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 100 [2021-11-23 02:23:11,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:23:11,035 INFO L225 Difference]: With dead ends: 3826 [2021-11-23 02:23:11,036 INFO L226 Difference]: Without dead ends: 1917 [2021-11-23 02:23:11,043 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:23:11,044 INFO L933 BasicCegarLoop]: 1310 mSDtfsCounter, 1996 mSDsluCounter, 1883 mSDsCounter, 0 mSdLazyCounter, 609 mSolverCounterSat, 542 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1997 SdHoareTripleChecker+Valid, 3080 SdHoareTripleChecker+Invalid, 1152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 542 IncrementalHoareTripleChecker+Valid, 609 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:23:11,044 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1997 Valid, 3080 Invalid, 1152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [542 Valid, 609 Invalid, 1 Unknown, 0 Unchecked, 8.9s Time] [2021-11-23 02:23:11,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1917 states. [2021-11-23 02:23:11,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1917 to 1909. [2021-11-23 02:23:11,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1909 states, 1240 states have (on average 1.3629032258064515) internal successors, (1690), 1285 states have internal predecessors, (1690), 550 states have call successors, (550), 118 states have call predecessors, (550), 118 states have return successors, (549), 529 states have call predecessors, (549), 549 states have call successors, (549) [2021-11-23 02:23:11,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1909 states to 1909 states and 2789 transitions. [2021-11-23 02:23:11,177 INFO L78 Accepts]: Start accepts. Automaton has 1909 states and 2789 transitions. Word has length 100 [2021-11-23 02:23:11,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:23:11,178 INFO L470 AbstractCegarLoop]: Abstraction has 1909 states and 2789 transitions. [2021-11-23 02:23:11,178 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:23:11,178 INFO L276 IsEmpty]: Start isEmpty. Operand 1909 states and 2789 transitions. [2021-11-23 02:23:11,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 02:23:11,181 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:23:11,182 INFO L514 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:23:11,182 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-23 02:23:11,183 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:23:11,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:23:11,183 INFO L85 PathProgramCache]: Analyzing trace with hash -520531545, now seen corresponding path program 1 times [2021-11-23 02:23:11,183 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:23:11,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1157914719] [2021-11-23 02:23:11,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:11,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:23:11,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:11,546 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 02:23:11,547 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:23:11,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1157914719] [2021-11-23 02:23:11,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1157914719] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:23:11,547 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:23:11,547 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:23:11,547 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565660706] [2021-11-23 02:23:11,547 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:23:11,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:23:11,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:23:11,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:23:11,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:23:11,549 INFO L87 Difference]: Start difference. First operand 1909 states and 2789 transitions. Second operand has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:23:14,264 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:23:20,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:23:20,852 INFO L93 Difference]: Finished difference Result 3822 states and 5585 transitions. [2021-11-23 02:23:20,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:23:20,855 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 101 [2021-11-23 02:23:20,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:23:20,863 INFO L225 Difference]: With dead ends: 3822 [2021-11-23 02:23:20,863 INFO L226 Difference]: Without dead ends: 1915 [2021-11-23 02:23:20,870 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:23:20,871 INFO L933 BasicCegarLoop]: 1432 mSDtfsCounter, 1927 mSDsluCounter, 2174 mSDsCounter, 0 mSdLazyCounter, 661 mSolverCounterSat, 521 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1929 SdHoareTripleChecker+Valid, 3478 SdHoareTripleChecker+Invalid, 1183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 521 IncrementalHoareTripleChecker+Valid, 661 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:23:20,872 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1929 Valid, 3478 Invalid, 1183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [521 Valid, 661 Invalid, 1 Unknown, 0 Unchecked, 9.1s Time] [2021-11-23 02:23:20,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1915 states. [2021-11-23 02:23:20,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1915 to 1907. [2021-11-23 02:23:20,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1907 states, 1239 states have (on average 1.3623890234059726) internal successors, (1688), 1284 states have internal predecessors, (1688), 549 states have call successors, (549), 118 states have call predecessors, (549), 118 states have return successors, (548), 528 states have call predecessors, (548), 548 states have call successors, (548) [2021-11-23 02:23:21,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1907 states to 1907 states and 2785 transitions. [2021-11-23 02:23:21,004 INFO L78 Accepts]: Start accepts. Automaton has 1907 states and 2785 transitions. Word has length 101 [2021-11-23 02:23:21,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:23:21,005 INFO L470 AbstractCegarLoop]: Abstraction has 1907 states and 2785 transitions. [2021-11-23 02:23:21,005 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:23:21,005 INFO L276 IsEmpty]: Start isEmpty. Operand 1907 states and 2785 transitions. [2021-11-23 02:23:21,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 02:23:21,008 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:23:21,009 INFO L514 BasicCegarLoop]: trace histogram [7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:23:21,009 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-23 02:23:21,009 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:23:21,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:23:21,010 INFO L85 PathProgramCache]: Analyzing trace with hash 1721639643, now seen corresponding path program 1 times [2021-11-23 02:23:21,010 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:23:21,010 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455946000] [2021-11-23 02:23:21,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:21,011 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:23:21,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:21,369 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-23 02:23:21,369 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:23:21,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1455946000] [2021-11-23 02:23:21,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1455946000] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:23:21,370 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:23:21,370 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:23:21,370 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422570021] [2021-11-23 02:23:21,370 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:23:21,370 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:23:21,371 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:23:21,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:23:21,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:23:21,371 INFO L87 Difference]: Start difference. First operand 1907 states and 2785 transitions. Second operand has 5 states, 5 states have (on average 11.8) internal successors, (59), 4 states have internal predecessors, (59), 2 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2021-11-23 02:23:24,684 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:23:26,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:23:26,774 INFO L93 Difference]: Finished difference Result 3032 states and 4432 transitions. [2021-11-23 02:23:26,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:23:26,779 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 4 states have internal predecessors, (59), 2 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) Word has length 102 [2021-11-23 02:23:26,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:23:26,790 INFO L225 Difference]: With dead ends: 3032 [2021-11-23 02:23:26,790 INFO L226 Difference]: Without dead ends: 3030 [2021-11-23 02:23:26,792 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:23:26,793 INFO L933 BasicCegarLoop]: 1997 mSDtfsCounter, 1393 mSDsluCounter, 5454 mSDsCounter, 0 mSdLazyCounter, 405 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1395 SdHoareTripleChecker+Valid, 7176 SdHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 405 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:23:26,793 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1395 Valid, 7176 Invalid, 409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 405 Invalid, 1 Unknown, 0 Unchecked, 5.2s Time] [2021-11-23 02:23:26,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3030 states. [2021-11-23 02:23:26,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3030 to 2018. [2021-11-23 02:23:26,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2018 states, 1312 states have (on average 1.361280487804878) internal successors, (1786), 1357 states have internal predecessors, (1786), 577 states have call successors, (577), 128 states have call predecessors, (577), 128 states have return successors, (576), 556 states have call predecessors, (576), 576 states have call successors, (576) [2021-11-23 02:23:26,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2018 states to 2018 states and 2939 transitions. [2021-11-23 02:23:26,947 INFO L78 Accepts]: Start accepts. Automaton has 2018 states and 2939 transitions. Word has length 102 [2021-11-23 02:23:26,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:23:26,948 INFO L470 AbstractCegarLoop]: Abstraction has 2018 states and 2939 transitions. [2021-11-23 02:23:26,948 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 4 states have internal predecessors, (59), 2 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2021-11-23 02:23:26,948 INFO L276 IsEmpty]: Start isEmpty. Operand 2018 states and 2939 transitions. [2021-11-23 02:23:26,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2021-11-23 02:23:26,954 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:23:26,954 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:23:26,954 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-23 02:23:26,954 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:23:26,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:23:26,955 INFO L85 PathProgramCache]: Analyzing trace with hash -1708988388, now seen corresponding path program 1 times [2021-11-23 02:23:26,955 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:23:26,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648771037] [2021-11-23 02:23:26,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:26,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:23:27,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:27,582 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-23 02:23:27,582 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:23:27,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648771037] [2021-11-23 02:23:27,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [648771037] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:23:27,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [880368451] [2021-11-23 02:23:27,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:27,583 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:23:27,584 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:23:27,589 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:23:27,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:23:28,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:28,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 1970 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:23:28,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:23:29,127 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-23 02:23:29,127 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:23:29,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [880368451] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:23:29,127 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:23:29,128 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-23 02:23:29,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66155413] [2021-11-23 02:23:29,128 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:23:29,129 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:23:29,129 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:23:29,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:23:29,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:23:29,130 INFO L87 Difference]: Start difference. First operand 2018 states and 2939 transitions. Second operand has 5 states, 5 states have (on average 20.8) internal successors, (104), 5 states have internal predecessors, (104), 3 states have call successors, (26), 3 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) [2021-11-23 02:23:32,164 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:23:37,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:23:37,543 INFO L93 Difference]: Finished difference Result 4038 states and 5885 transitions. [2021-11-23 02:23:37,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:23:37,544 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 20.8) internal successors, (104), 5 states have internal predecessors, (104), 3 states have call successors, (26), 3 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) Word has length 171 [2021-11-23 02:23:37,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:23:37,556 INFO L225 Difference]: With dead ends: 4038 [2021-11-23 02:23:37,556 INFO L226 Difference]: Without dead ends: 2022 [2021-11-23 02:23:37,563 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:23:37,564 INFO L933 BasicCegarLoop]: 1285 mSDtfsCounter, 1069 mSDsluCounter, 2126 mSDsCounter, 0 mSdLazyCounter, 1783 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1070 SdHoareTripleChecker+Valid, 3234 SdHoareTripleChecker+Invalid, 1791 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1783 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:23:37,564 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1070 Valid, 3234 Invalid, 1791 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1783 Invalid, 1 Unknown, 0 Unchecked, 8.2s Time] [2021-11-23 02:23:37,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2022 states. [2021-11-23 02:23:37,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2022 to 2016. [2021-11-23 02:23:37,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2016 states, 1311 states have (on average 1.360793287566743) internal successors, (1784), 1356 states have internal predecessors, (1784), 576 states have call successors, (576), 128 states have call predecessors, (576), 128 states have return successors, (575), 555 states have call predecessors, (575), 575 states have call successors, (575) [2021-11-23 02:23:37,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2016 states to 2016 states and 2935 transitions. [2021-11-23 02:23:37,721 INFO L78 Accepts]: Start accepts. Automaton has 2016 states and 2935 transitions. Word has length 171 [2021-11-23 02:23:37,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:23:37,722 INFO L470 AbstractCegarLoop]: Abstraction has 2016 states and 2935 transitions. [2021-11-23 02:23:37,722 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 20.8) internal successors, (104), 5 states have internal predecessors, (104), 3 states have call successors, (26), 3 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) [2021-11-23 02:23:37,722 INFO L276 IsEmpty]: Start isEmpty. Operand 2016 states and 2935 transitions. [2021-11-23 02:23:37,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-23 02:23:37,729 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:23:37,729 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:23:37,772 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:23:37,950 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-23 02:23:37,951 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:23:37,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:23:37,951 INFO L85 PathProgramCache]: Analyzing trace with hash 649996473, now seen corresponding path program 1 times [2021-11-23 02:23:37,951 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:23:37,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094890987] [2021-11-23 02:23:37,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:37,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:23:38,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:38,537 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-23 02:23:38,537 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:23:38,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094890987] [2021-11-23 02:23:38,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1094890987] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:23:38,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1076328384] [2021-11-23 02:23:38,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:38,538 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:23:38,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:23:38,539 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:23:38,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:23:39,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:39,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 1964 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:23:39,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:23:40,095 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-23 02:23:40,095 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:23:40,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1076328384] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:23:40,096 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:23:40,096 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-23 02:23:40,097 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [808040840] [2021-11-23 02:23:40,097 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:23:40,098 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:23:40,098 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:23:40,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:23:40,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:23:40,099 INFO L87 Difference]: Start difference. First operand 2016 states and 2935 transitions. Second operand has 5 states, 5 states have (on average 21.2) internal successors, (106), 5 states have internal predecessors, (106), 3 states have call successors, (25), 3 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) [2021-11-23 02:23:43,061 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:23:49,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:23:49,077 INFO L93 Difference]: Finished difference Result 4033 states and 5874 transitions. [2021-11-23 02:23:49,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:23:49,078 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 21.2) internal successors, (106), 5 states have internal predecessors, (106), 3 states have call successors, (25), 3 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) Word has length 170 [2021-11-23 02:23:49,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:23:49,087 INFO L225 Difference]: With dead ends: 4033 [2021-11-23 02:23:49,087 INFO L226 Difference]: Without dead ends: 2019 [2021-11-23 02:23:49,095 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:23:49,096 INFO L933 BasicCegarLoop]: 1281 mSDtfsCounter, 1051 mSDsluCounter, 2123 mSDsCounter, 0 mSdLazyCounter, 1779 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1052 SdHoareTripleChecker+Valid, 3226 SdHoareTripleChecker+Invalid, 1788 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 1779 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:23:49,097 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1052 Valid, 3226 Invalid, 1788 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 1779 Invalid, 1 Unknown, 0 Unchecked, 8.7s Time] [2021-11-23 02:23:49,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2019 states. [2021-11-23 02:23:49,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2019 to 2012. [2021-11-23 02:23:49,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2012 states, 1309 states have (on average 1.359816653934301) internal successors, (1780), 1354 states have internal predecessors, (1780), 574 states have call successors, (574), 128 states have call predecessors, (574), 128 states have return successors, (573), 553 states have call predecessors, (573), 573 states have call successors, (573) [2021-11-23 02:23:49,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2012 states to 2012 states and 2927 transitions. [2021-11-23 02:23:49,251 INFO L78 Accepts]: Start accepts. Automaton has 2012 states and 2927 transitions. Word has length 170 [2021-11-23 02:23:49,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:23:49,252 INFO L470 AbstractCegarLoop]: Abstraction has 2012 states and 2927 transitions. [2021-11-23 02:23:49,252 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 21.2) internal successors, (106), 5 states have internal predecessors, (106), 3 states have call successors, (25), 3 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) [2021-11-23 02:23:49,252 INFO L276 IsEmpty]: Start isEmpty. Operand 2012 states and 2927 transitions. [2021-11-23 02:23:49,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-11-23 02:23:49,258 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:23:49,258 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:23:49,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:23:49,473 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-23 02:23:49,474 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:23:49,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:23:49,474 INFO L85 PathProgramCache]: Analyzing trace with hash -1207516784, now seen corresponding path program 1 times [2021-11-23 02:23:49,474 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:23:49,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75536929] [2021-11-23 02:23:49,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:49,475 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:23:49,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:49,997 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-23 02:23:49,997 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:23:49,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75536929] [2021-11-23 02:23:49,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [75536929] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:23:49,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [702318060] [2021-11-23 02:23:49,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:50,000 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:23:50,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:23:50,006 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:23:50,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:23:50,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:50,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 1958 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:23:50,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:23:51,572 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-23 02:23:51,572 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:23:51,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [702318060] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:23:51,573 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:23:51,573 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-23 02:23:51,573 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699542677] [2021-11-23 02:23:51,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:23:51,573 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:23:51,574 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:23:51,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:23:51,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:23:51,574 INFO L87 Difference]: Start difference. First operand 2012 states and 2927 transitions. Second operand has 5 states, 5 states have (on average 21.6) internal successors, (108), 5 states have internal predecessors, (108), 3 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) [2021-11-23 02:23:54,629 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:24:01,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:24:01,161 INFO L93 Difference]: Finished difference Result 4025 states and 5858 transitions. [2021-11-23 02:24:01,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:24:01,163 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 21.6) internal successors, (108), 5 states have internal predecessors, (108), 3 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) Word has length 169 [2021-11-23 02:24:01,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:24:01,170 INFO L225 Difference]: With dead ends: 4025 [2021-11-23 02:24:01,170 INFO L226 Difference]: Without dead ends: 2015 [2021-11-23 02:24:01,175 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:24:01,175 INFO L933 BasicCegarLoop]: 1277 mSDtfsCounter, 1043 mSDsluCounter, 2118 mSDsCounter, 0 mSdLazyCounter, 1775 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1044 SdHoareTripleChecker+Valid, 3218 SdHoareTripleChecker+Invalid, 1783 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1775 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:24:01,176 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1044 Valid, 3218 Invalid, 1783 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1775 Invalid, 1 Unknown, 0 Unchecked, 9.3s Time] [2021-11-23 02:24:01,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2015 states. [2021-11-23 02:24:01,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2015 to 2008. [2021-11-23 02:24:01,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2008 states, 1307 states have (on average 1.3588370313695486) internal successors, (1776), 1352 states have internal predecessors, (1776), 572 states have call successors, (572), 128 states have call predecessors, (572), 128 states have return successors, (571), 551 states have call predecessors, (571), 571 states have call successors, (571) [2021-11-23 02:24:01,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2008 states to 2008 states and 2919 transitions. [2021-11-23 02:24:01,324 INFO L78 Accepts]: Start accepts. Automaton has 2008 states and 2919 transitions. Word has length 169 [2021-11-23 02:24:01,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:24:01,325 INFO L470 AbstractCegarLoop]: Abstraction has 2008 states and 2919 transitions. [2021-11-23 02:24:01,326 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 21.6) internal successors, (108), 5 states have internal predecessors, (108), 3 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) [2021-11-23 02:24:01,326 INFO L276 IsEmpty]: Start isEmpty. Operand 2008 states and 2919 transitions. [2021-11-23 02:24:01,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-11-23 02:24:01,332 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:24:01,332 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:24:01,382 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:24:01,558 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:24:01,559 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:24:01,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:24:01,559 INFO L85 PathProgramCache]: Analyzing trace with hash 1738169237, now seen corresponding path program 1 times [2021-11-23 02:24:01,559 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:24:01,559 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1571650393] [2021-11-23 02:24:01,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:24:01,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:24:01,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:24:02,123 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-23 02:24:02,124 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:24:02,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1571650393] [2021-11-23 02:24:02,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1571650393] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:24:02,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [954090218] [2021-11-23 02:24:02,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:24:02,124 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:24:02,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:24:02,126 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:24:02,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:24:03,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:24:03,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 1952 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:24:03,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:24:03,752 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-23 02:24:03,752 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:24:03,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [954090218] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:24:03,753 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:24:03,753 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 8 [2021-11-23 02:24:03,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86433395] [2021-11-23 02:24:03,753 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:24:03,754 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:24:03,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:24:03,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:24:03,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:24:03,755 INFO L87 Difference]: Start difference. First operand 2008 states and 2919 transitions. Second operand has 5 states, 5 states have (on average 21.0) internal successors, (105), 5 states have internal predecessors, (105), 3 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-23 02:24:07,143 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:24:14,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:24:14,397 INFO L93 Difference]: Finished difference Result 4023 states and 5850 transitions. [2021-11-23 02:24:14,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:24:14,400 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 21.0) internal successors, (105), 5 states have internal predecessors, (105), 3 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) Word has length 168 [2021-11-23 02:24:14,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:24:14,407 INFO L225 Difference]: With dead ends: 4023 [2021-11-23 02:24:14,407 INFO L226 Difference]: Without dead ends: 2005 [2021-11-23 02:24:14,413 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 167 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:24:14,414 INFO L933 BasicCegarLoop]: 1612 mSDtfsCounter, 563 mSDsluCounter, 3743 mSDsCounter, 0 mSdLazyCounter, 1577 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 564 SdHoareTripleChecker+Valid, 5088 SdHoareTripleChecker+Invalid, 1582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 1577 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:24:14,414 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [564 Valid, 5088 Invalid, 1582 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 1577 Invalid, 1 Unknown, 0 Unchecked, 10.4s Time] [2021-11-23 02:24:14,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2005 states. [2021-11-23 02:24:14,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2005 to 2002. [2021-11-23 02:24:14,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2002 states, 1303 states have (on average 1.357636224098235) internal successors, (1769), 1348 states have internal predecessors, (1769), 570 states have call successors, (570), 128 states have call predecessors, (570), 128 states have return successors, (569), 549 states have call predecessors, (569), 569 states have call successors, (569) [2021-11-23 02:24:14,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2002 states to 2002 states and 2908 transitions. [2021-11-23 02:24:14,525 INFO L78 Accepts]: Start accepts. Automaton has 2002 states and 2908 transitions. Word has length 168 [2021-11-23 02:24:14,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:24:14,525 INFO L470 AbstractCegarLoop]: Abstraction has 2002 states and 2908 transitions. [2021-11-23 02:24:14,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 21.0) internal successors, (105), 5 states have internal predecessors, (105), 3 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-23 02:24:14,526 INFO L276 IsEmpty]: Start isEmpty. Operand 2002 states and 2908 transitions. [2021-11-23 02:24:14,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-11-23 02:24:14,532 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:24:14,532 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:24:14,575 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:24:14,746 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-23 02:24:14,747 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:24:14,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:24:14,747 INFO L85 PathProgramCache]: Analyzing trace with hash -2058969378, now seen corresponding path program 1 times [2021-11-23 02:24:14,747 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:24:14,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [692710155] [2021-11-23 02:24:14,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:24:14,748 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:24:14,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:24:15,241 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-23 02:24:15,242 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:24:15,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [692710155] [2021-11-23 02:24:15,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [692710155] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:24:15,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1709817256] [2021-11-23 02:24:15,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:24:15,242 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:24:15,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:24:15,243 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:24:15,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:24:16,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:24:16,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 1954 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:24:16,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:24:16,612 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 39 proven. 0 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-23 02:24:16,612 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:24:16,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1709817256] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:24:16,613 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:24:16,613 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 8 [2021-11-23 02:24:16,613 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41795878] [2021-11-23 02:24:16,613 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:24:16,614 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:24:16,614 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:24:16,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:24:16,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:24:16,615 INFO L87 Difference]: Start difference. First operand 2002 states and 2908 transitions. Second operand has 5 states, 5 states have (on average 21.2) internal successors, (106), 5 states have internal predecessors, (106), 3 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-23 02:24:19,590 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:24:26,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:24:26,840 INFO L93 Difference]: Finished difference Result 3998 states and 5812 transitions. [2021-11-23 02:24:26,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:24:26,846 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 21.2) internal successors, (106), 5 states have internal predecessors, (106), 3 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) Word has length 169 [2021-11-23 02:24:26,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:24:26,853 INFO L225 Difference]: With dead ends: 3998 [2021-11-23 02:24:26,853 INFO L226 Difference]: Without dead ends: 1998 [2021-11-23 02:24:26,858 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 168 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:24:26,859 INFO L933 BasicCegarLoop]: 1599 mSDtfsCounter, 740 mSDsluCounter, 2682 mSDsCounter, 0 mSdLazyCounter, 1542 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 741 SdHoareTripleChecker+Valid, 4073 SdHoareTripleChecker+Invalid, 1547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 1542 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:24:26,859 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [741 Valid, 4073 Invalid, 1547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 1542 Invalid, 1 Unknown, 0 Unchecked, 10.0s Time] [2021-11-23 02:24:26,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1998 states. [2021-11-23 02:24:26,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1998 to 1996. [2021-11-23 02:24:26,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1996 states, 1299 states have (on average 1.3556581986143188) internal successors, (1761), 1344 states have internal predecessors, (1761), 568 states have call successors, (568), 128 states have call predecessors, (568), 128 states have return successors, (567), 547 states have call predecessors, (567), 567 states have call successors, (567) [2021-11-23 02:24:26,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1996 states to 1996 states and 2896 transitions. [2021-11-23 02:24:26,975 INFO L78 Accepts]: Start accepts. Automaton has 1996 states and 2896 transitions. Word has length 169 [2021-11-23 02:24:26,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:24:26,976 INFO L470 AbstractCegarLoop]: Abstraction has 1996 states and 2896 transitions. [2021-11-23 02:24:26,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 21.2) internal successors, (106), 5 states have internal predecessors, (106), 3 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-23 02:24:26,976 INFO L276 IsEmpty]: Start isEmpty. Operand 1996 states and 2896 transitions. [2021-11-23 02:24:26,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2021-11-23 02:24:26,981 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:24:26,982 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:24:27,027 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:24:27,194 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-23 02:24:27,195 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:24:27,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:24:27,195 INFO L85 PathProgramCache]: Analyzing trace with hash 593306188, now seen corresponding path program 1 times [2021-11-23 02:24:27,195 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:24:27,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [463128706] [2021-11-23 02:24:27,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:24:27,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:24:27,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:24:27,699 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-23 02:24:27,699 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:24:27,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [463128706] [2021-11-23 02:24:27,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [463128706] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:24:27,700 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:24:27,700 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:24:27,700 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423191938] [2021-11-23 02:24:27,700 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:24:27,701 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:24:27,701 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:24:27,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:24:27,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:24:27,702 INFO L87 Difference]: Start difference. First operand 1996 states and 2896 transitions. Second operand has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 3 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) [2021-11-23 02:24:30,727 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:24:45,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:24:45,969 INFO L93 Difference]: Finished difference Result 4364 states and 6318 transitions. [2021-11-23 02:24:45,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:24:45,972 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 3 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) Word has length 175 [2021-11-23 02:24:45,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:24:45,982 INFO L225 Difference]: With dead ends: 4364 [2021-11-23 02:24:45,983 INFO L226 Difference]: Without dead ends: 2370 [2021-11-23 02:24:45,987 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:24:45,988 INFO L933 BasicCegarLoop]: 2085 mSDtfsCounter, 1967 mSDsluCounter, 3586 mSDsCounter, 0 mSdLazyCounter, 3278 mSolverCounterSat, 17 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1967 SdHoareTripleChecker+Valid, 5304 SdHoareTripleChecker+Invalid, 3296 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 3278 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:24:45,990 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1967 Valid, 5304 Invalid, 3296 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 3278 Invalid, 1 Unknown, 0 Unchecked, 17.9s Time] [2021-11-23 02:24:45,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2370 states. [2021-11-23 02:24:46,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2370 to 2368. [2021-11-23 02:24:46,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2368 states, 1546 states have (on average 1.3479948253557568) internal successors, (2084), 1601 states have internal predecessors, (2084), 667 states have call successors, (667), 154 states have call predecessors, (667), 154 states have return successors, (666), 642 states have call predecessors, (666), 666 states have call successors, (666) [2021-11-23 02:24:46,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2368 states to 2368 states and 3417 transitions. [2021-11-23 02:24:46,161 INFO L78 Accepts]: Start accepts. Automaton has 2368 states and 3417 transitions. Word has length 175 [2021-11-23 02:24:46,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:24:46,162 INFO L470 AbstractCegarLoop]: Abstraction has 2368 states and 3417 transitions. [2021-11-23 02:24:46,162 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 3 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) [2021-11-23 02:24:46,162 INFO L276 IsEmpty]: Start isEmpty. Operand 2368 states and 3417 transitions. [2021-11-23 02:24:46,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2021-11-23 02:24:46,167 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:24:46,167 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:24:46,167 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-11-23 02:24:46,168 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:24:46,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:24:46,168 INFO L85 PathProgramCache]: Analyzing trace with hash 256897517, now seen corresponding path program 1 times [2021-11-23 02:24:46,168 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:24:46,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412084816] [2021-11-23 02:24:46,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:24:46,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:24:46,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:24:46,730 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2021-11-23 02:24:46,730 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:24:46,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412084816] [2021-11-23 02:24:46,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412084816] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:24:46,731 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:24:46,731 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:24:46,731 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308019420] [2021-11-23 02:24:46,731 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:24:46,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:24:46,732 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:24:46,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:24:46,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:24:46,733 INFO L87 Difference]: Start difference. First operand 2368 states and 3417 transitions. Second operand has 6 states, 6 states have (on average 16.333333333333332) internal successors, (98), 6 states have internal predecessors, (98), 4 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-23 02:24:49,406 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:25:02,838 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:25:03,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:25:03,016 INFO L93 Difference]: Finished difference Result 4734 states and 6838 transitions. [2021-11-23 02:25:03,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:25:03,019 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.333333333333332) internal successors, (98), 6 states have internal predecessors, (98), 4 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 4 states have call successors, (23) Word has length 177 [2021-11-23 02:25:03,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:25:03,028 INFO L225 Difference]: With dead ends: 4734 [2021-11-23 02:25:03,028 INFO L226 Difference]: Without dead ends: 2368 [2021-11-23 02:25:03,033 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:25:03,034 INFO L933 BasicCegarLoop]: 1490 mSDtfsCounter, 2165 mSDsluCounter, 1106 mSDsCounter, 0 mSdLazyCounter, 1802 mSolverCounterSat, 246 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2165 SdHoareTripleChecker+Valid, 2457 SdHoareTripleChecker+Invalid, 2050 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 246 IncrementalHoareTripleChecker+Valid, 1802 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:25:03,034 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2165 Valid, 2457 Invalid, 2050 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [246 Valid, 1802 Invalid, 2 Unknown, 0 Unchecked, 15.9s Time] [2021-11-23 02:25:03,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2368 states. [2021-11-23 02:25:03,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2368 to 2364. [2021-11-23 02:25:03,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2364 states, 1544 states have (on average 1.3471502590673574) internal successors, (2080), 1599 states have internal predecessors, (2080), 665 states have call successors, (665), 154 states have call predecessors, (665), 154 states have return successors, (664), 640 states have call predecessors, (664), 664 states have call successors, (664) [2021-11-23 02:25:03,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2364 states to 2364 states and 3409 transitions. [2021-11-23 02:25:03,255 INFO L78 Accepts]: Start accepts. Automaton has 2364 states and 3409 transitions. Word has length 177 [2021-11-23 02:25:03,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:25:03,255 INFO L470 AbstractCegarLoop]: Abstraction has 2364 states and 3409 transitions. [2021-11-23 02:25:03,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.333333333333332) internal successors, (98), 6 states have internal predecessors, (98), 4 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-23 02:25:03,256 INFO L276 IsEmpty]: Start isEmpty. Operand 2364 states and 3409 transitions. [2021-11-23 02:25:03,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-23 02:25:03,260 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:25:03,260 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:25:03,260 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-11-23 02:25:03,261 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:25:03,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:25:03,261 INFO L85 PathProgramCache]: Analyzing trace with hash 181535570, now seen corresponding path program 1 times [2021-11-23 02:25:03,261 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:25:03,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1087103138] [2021-11-23 02:25:03,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:25:03,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:25:03,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:25:03,691 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-23 02:25:03,691 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:25:03,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1087103138] [2021-11-23 02:25:03,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1087103138] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:25:03,692 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:25:03,692 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:25:03,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350438569] [2021-11-23 02:25:03,693 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:25:03,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:25:03,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:25:03,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:25:03,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:25:03,694 INFO L87 Difference]: Start difference. First operand 2364 states and 3409 transitions. Second operand has 5 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) [2021-11-23 02:25:07,232 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:25:12,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:25:12,271 INFO L93 Difference]: Finished difference Result 4722 states and 6811 transitions. [2021-11-23 02:25:12,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:25:12,282 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) Word has length 178 [2021-11-23 02:25:12,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:25:12,294 INFO L225 Difference]: With dead ends: 4722 [2021-11-23 02:25:12,295 INFO L226 Difference]: Without dead ends: 2360 [2021-11-23 02:25:12,302 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:25:12,303 INFO L933 BasicCegarLoop]: 1590 mSDtfsCounter, 728 mSDsluCounter, 3818 mSDsCounter, 0 mSdLazyCounter, 896 mSolverCounterSat, 13 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 728 SdHoareTripleChecker+Valid, 5174 SdHoareTripleChecker+Invalid, 910 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 896 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:25:12,304 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [728 Valid, 5174 Invalid, 910 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 896 Invalid, 1 Unknown, 0 Unchecked, 8.4s Time] [2021-11-23 02:25:12,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2360 states. [2021-11-23 02:25:12,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2360 to 2358. [2021-11-23 02:25:12,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2358 states, 1540 states have (on average 1.3454545454545455) internal successors, (2072), 1595 states have internal predecessors, (2072), 663 states have call successors, (663), 154 states have call predecessors, (663), 154 states have return successors, (662), 638 states have call predecessors, (662), 662 states have call successors, (662) [2021-11-23 02:25:12,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2358 states to 2358 states and 3397 transitions. [2021-11-23 02:25:12,481 INFO L78 Accepts]: Start accepts. Automaton has 2358 states and 3397 transitions. Word has length 178 [2021-11-23 02:25:12,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:25:12,482 INFO L470 AbstractCegarLoop]: Abstraction has 2358 states and 3397 transitions. [2021-11-23 02:25:12,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) [2021-11-23 02:25:12,483 INFO L276 IsEmpty]: Start isEmpty. Operand 2358 states and 3397 transitions. [2021-11-23 02:25:12,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2021-11-23 02:25:12,487 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:25:12,488 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:25:12,488 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-11-23 02:25:12,488 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:25:12,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:25:12,490 INFO L85 PathProgramCache]: Analyzing trace with hash -282425460, now seen corresponding path program 1 times [2021-11-23 02:25:12,490 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:25:12,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [201624713] [2021-11-23 02:25:12,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:25:12,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:25:12,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:25:12,960 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 99 trivial. 0 not checked. [2021-11-23 02:25:12,960 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:25:12,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [201624713] [2021-11-23 02:25:12,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [201624713] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:25:12,961 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:25:12,961 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:25:12,961 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108128920] [2021-11-23 02:25:12,961 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:25:12,962 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:25:12,962 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:25:12,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:25:12,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:25:12,962 INFO L87 Difference]: Start difference. First operand 2358 states and 3397 transitions. Second operand has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) [2021-11-23 02:25:15,698 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:25:19,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:25:19,498 INFO L93 Difference]: Finished difference Result 4713 states and 6792 transitions. [2021-11-23 02:25:19,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:25:19,503 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) Word has length 180 [2021-11-23 02:25:19,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:25:19,514 INFO L225 Difference]: With dead ends: 4713 [2021-11-23 02:25:19,514 INFO L226 Difference]: Without dead ends: 2357 [2021-11-23 02:25:19,519 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:25:19,520 INFO L933 BasicCegarLoop]: 1265 mSDtfsCounter, 1242 mSDsluCounter, 2327 mSDsCounter, 0 mSdLazyCounter, 719 mSolverCounterSat, 12 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1243 SdHoareTripleChecker+Valid, 3442 SdHoareTripleChecker+Invalid, 732 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 719 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:25:19,520 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1243 Valid, 3442 Invalid, 732 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 719 Invalid, 1 Unknown, 0 Unchecked, 6.3s Time] [2021-11-23 02:25:19,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2357 states. [2021-11-23 02:25:19,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2357 to 2354. [2021-11-23 02:25:19,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2354 states, 1538 states have (on average 1.3446033810143043) internal successors, (2068), 1593 states have internal predecessors, (2068), 661 states have call successors, (661), 154 states have call predecessors, (661), 154 states have return successors, (660), 636 states have call predecessors, (660), 660 states have call successors, (660) [2021-11-23 02:25:19,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2354 states to 2354 states and 3389 transitions. [2021-11-23 02:25:19,668 INFO L78 Accepts]: Start accepts. Automaton has 2354 states and 3389 transitions. Word has length 180 [2021-11-23 02:25:19,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:25:19,669 INFO L470 AbstractCegarLoop]: Abstraction has 2354 states and 3389 transitions. [2021-11-23 02:25:19,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) [2021-11-23 02:25:19,669 INFO L276 IsEmpty]: Start isEmpty. Operand 2354 states and 3389 transitions. [2021-11-23 02:25:19,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-11-23 02:25:19,673 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:25:19,674 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:25:19,674 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-11-23 02:25:19,674 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:25:19,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:25:19,675 INFO L85 PathProgramCache]: Analyzing trace with hash 298157394, now seen corresponding path program 1 times [2021-11-23 02:25:19,675 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:25:19,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1698744827] [2021-11-23 02:25:19,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:25:19,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:25:19,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:25:20,056 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-23 02:25:20,056 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:25:20,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1698744827] [2021-11-23 02:25:20,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1698744827] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:25:20,056 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:25:20,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:25:20,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375154896] [2021-11-23 02:25:20,057 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:25:20,057 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:25:20,057 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:25:20,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:25:20,058 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:25:20,058 INFO L87 Difference]: Start difference. First operand 2354 states and 3389 transitions. Second operand has 5 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) [2021-11-23 02:25:22,910 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:25:29,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:25:29,161 INFO L93 Difference]: Finished difference Result 4702 states and 6771 transitions. [2021-11-23 02:25:29,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:25:29,166 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) Word has length 181 [2021-11-23 02:25:29,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:25:29,174 INFO L225 Difference]: With dead ends: 4702 [2021-11-23 02:25:29,175 INFO L226 Difference]: Without dead ends: 2350 [2021-11-23 02:25:29,180 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:25:29,180 INFO L933 BasicCegarLoop]: 1581 mSDtfsCounter, 1138 mSDsluCounter, 2744 mSDsCounter, 0 mSdLazyCounter, 662 mSolverCounterSat, 295 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1138 SdHoareTripleChecker+Valid, 4156 SdHoareTripleChecker+Invalid, 958 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 295 IncrementalHoareTripleChecker+Valid, 662 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:25:29,181 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1138 Valid, 4156 Invalid, 958 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [295 Valid, 662 Invalid, 1 Unknown, 0 Unchecked, 8.9s Time] [2021-11-23 02:25:29,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2350 states. [2021-11-23 02:25:29,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2350 to 2348. [2021-11-23 02:25:29,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2348 states, 1534 states have (on average 1.3428943937418514) internal successors, (2060), 1589 states have internal predecessors, (2060), 659 states have call successors, (659), 154 states have call predecessors, (659), 154 states have return successors, (658), 634 states have call predecessors, (658), 658 states have call successors, (658) [2021-11-23 02:25:29,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2348 states to 2348 states and 3377 transitions. [2021-11-23 02:25:29,332 INFO L78 Accepts]: Start accepts. Automaton has 2348 states and 3377 transitions. Word has length 181 [2021-11-23 02:25:29,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:25:29,333 INFO L470 AbstractCegarLoop]: Abstraction has 2348 states and 3377 transitions. [2021-11-23 02:25:29,333 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) [2021-11-23 02:25:29,333 INFO L276 IsEmpty]: Start isEmpty. Operand 2348 states and 3377 transitions. [2021-11-23 02:25:29,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2021-11-23 02:25:29,336 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:25:29,336 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:25:29,336 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-11-23 02:25:29,336 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:25:29,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:25:29,337 INFO L85 PathProgramCache]: Analyzing trace with hash 1351800616, now seen corresponding path program 1 times [2021-11-23 02:25:29,337 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:25:29,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684534501] [2021-11-23 02:25:29,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:25:29,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:25:29,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:25:29,730 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2021-11-23 02:25:29,730 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:25:29,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684534501] [2021-11-23 02:25:29,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1684534501] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:25:29,731 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:25:29,731 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:25:29,731 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824865362] [2021-11-23 02:25:29,731 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:25:29,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:25:29,732 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:25:29,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:25:29,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:25:29,733 INFO L87 Difference]: Start difference. First operand 2348 states and 3377 transitions. Second operand has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-23 02:25:33,139 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:25:37,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:25:37,212 INFO L93 Difference]: Finished difference Result 4693 states and 6752 transitions. [2021-11-23 02:25:37,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:25:37,218 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) Word has length 183 [2021-11-23 02:25:37,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:25:37,227 INFO L225 Difference]: With dead ends: 4693 [2021-11-23 02:25:37,228 INFO L226 Difference]: Without dead ends: 2347 [2021-11-23 02:25:37,235 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:25:37,236 INFO L933 BasicCegarLoop]: 1256 mSDtfsCounter, 1231 mSDsluCounter, 2317 mSDsCounter, 0 mSdLazyCounter, 717 mSolverCounterSat, 13 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1232 SdHoareTripleChecker+Valid, 3424 SdHoareTripleChecker+Invalid, 731 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 717 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:25:37,236 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1232 Valid, 3424 Invalid, 731 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 717 Invalid, 1 Unknown, 0 Unchecked, 7.3s Time] [2021-11-23 02:25:37,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2347 states. [2021-11-23 02:25:37,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2347 to 2344. [2021-11-23 02:25:37,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2344 states, 1532 states have (on average 1.3420365535248042) internal successors, (2056), 1587 states have internal predecessors, (2056), 657 states have call successors, (657), 154 states have call predecessors, (657), 154 states have return successors, (656), 632 states have call predecessors, (656), 656 states have call successors, (656) [2021-11-23 02:25:37,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2344 states to 2344 states and 3369 transitions. [2021-11-23 02:25:37,413 INFO L78 Accepts]: Start accepts. Automaton has 2344 states and 3369 transitions. Word has length 183 [2021-11-23 02:25:37,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:25:37,414 INFO L470 AbstractCegarLoop]: Abstraction has 2344 states and 3369 transitions. [2021-11-23 02:25:37,414 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-23 02:25:37,414 INFO L276 IsEmpty]: Start isEmpty. Operand 2344 states and 3369 transitions. [2021-11-23 02:25:37,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2021-11-23 02:25:37,419 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:25:37,419 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:25:37,419 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-11-23 02:25:37,420 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:25:37,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:25:37,420 INFO L85 PathProgramCache]: Analyzing trace with hash 1308350996, now seen corresponding path program 1 times [2021-11-23 02:25:37,420 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:25:37,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411075805] [2021-11-23 02:25:37,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:25:37,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:25:37,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:25:37,894 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-23 02:25:37,894 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:25:37,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411075805] [2021-11-23 02:25:37,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411075805] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:25:37,894 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:25:37,895 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:25:37,895 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645828727] [2021-11-23 02:25:37,895 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:25:37,895 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:25:37,895 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:25:37,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:25:37,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:25:37,896 INFO L87 Difference]: Start difference. First operand 2344 states and 3369 transitions. Second operand has 6 states, 6 states have (on average 15.833333333333334) internal successors, (95), 5 states have internal predecessors, (95), 3 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-23 02:25:41,586 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:25:56,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:25:56,866 INFO L93 Difference]: Finished difference Result 3731 states and 5383 transitions. [2021-11-23 02:25:56,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:25:56,867 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.833333333333334) internal successors, (95), 5 states have internal predecessors, (95), 3 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) Word has length 184 [2021-11-23 02:25:56,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:25:56,880 INFO L225 Difference]: With dead ends: 3731 [2021-11-23 02:25:56,880 INFO L226 Difference]: Without dead ends: 3729 [2021-11-23 02:25:56,883 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:25:56,884 INFO L933 BasicCegarLoop]: 1501 mSDtfsCounter, 1919 mSDsluCounter, 1086 mSDsCounter, 0 mSdLazyCounter, 5275 mSolverCounterSat, 1216 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2173 SdHoareTripleChecker+Valid, 2537 SdHoareTripleChecker+Invalid, 6492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1216 IncrementalHoareTripleChecker+Valid, 5275 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:25:56,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2173 Valid, 2537 Invalid, 6492 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1216 Valid, 5275 Invalid, 1 Unknown, 0 Unchecked, 18.5s Time] [2021-11-23 02:25:56,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3729 states. [2021-11-23 02:25:57,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3729 to 2355. [2021-11-23 02:25:57,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2355 states, 1539 states have (on average 1.3404808317089019) internal successors, (2063), 1594 states have internal predecessors, (2063), 659 states have call successors, (659), 155 states have call predecessors, (659), 156 states have return successors, (660), 635 states have call predecessors, (660), 658 states have call successors, (660) [2021-11-23 02:25:57,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2355 states to 2355 states and 3382 transitions. [2021-11-23 02:25:57,078 INFO L78 Accepts]: Start accepts. Automaton has 2355 states and 3382 transitions. Word has length 184 [2021-11-23 02:25:57,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:25:57,078 INFO L470 AbstractCegarLoop]: Abstraction has 2355 states and 3382 transitions. [2021-11-23 02:25:57,078 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.833333333333334) internal successors, (95), 5 states have internal predecessors, (95), 3 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-23 02:25:57,079 INFO L276 IsEmpty]: Start isEmpty. Operand 2355 states and 3382 transitions. [2021-11-23 02:25:57,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2021-11-23 02:25:57,083 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:25:57,084 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:25:57,084 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-11-23 02:25:57,084 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:25:57,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:25:57,085 INFO L85 PathProgramCache]: Analyzing trace with hash -527732198, now seen corresponding path program 1 times [2021-11-23 02:25:57,085 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:25:57,085 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [676856476] [2021-11-23 02:25:57,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:25:57,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:25:57,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:25:57,639 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-23 02:25:57,640 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:25:57,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [676856476] [2021-11-23 02:25:57,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [676856476] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:25:57,640 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:25:57,641 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:25:57,641 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988696071] [2021-11-23 02:25:57,641 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:25:57,642 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:25:57,642 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:25:57,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:25:57,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:25:57,643 INFO L87 Difference]: Start difference. First operand 2355 states and 3382 transitions. Second operand has 5 states, 5 states have (on average 25.8) internal successors, (129), 5 states have internal predecessors, (129), 3 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) [2021-11-23 02:26:00,734 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:26:08,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:08,780 INFO L93 Difference]: Finished difference Result 4708 states and 6765 transitions. [2021-11-23 02:26:08,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:26:08,783 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 25.8) internal successors, (129), 5 states have internal predecessors, (129), 3 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) Word has length 263 [2021-11-23 02:26:08,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:08,791 INFO L225 Difference]: With dead ends: 4708 [2021-11-23 02:26:08,792 INFO L226 Difference]: Without dead ends: 2355 [2021-11-23 02:26:08,797 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:26:08,798 INFO L933 BasicCegarLoop]: 1250 mSDtfsCounter, 1651 mSDsluCounter, 2083 mSDsCounter, 0 mSdLazyCounter, 632 mSolverCounterSat, 442 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1652 SdHoareTripleChecker+Valid, 3215 SdHoareTripleChecker+Invalid, 1075 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 442 IncrementalHoareTripleChecker+Valid, 632 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:08,798 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1652 Valid, 3215 Invalid, 1075 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [442 Valid, 632 Invalid, 1 Unknown, 0 Unchecked, 10.9s Time] [2021-11-23 02:26:08,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2355 states. [2021-11-23 02:26:08,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2355 to 2353. [2021-11-23 02:26:08,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2353 states, 1538 states have (on average 1.3400520156046813) internal successors, (2061), 1593 states have internal predecessors, (2061), 658 states have call successors, (658), 155 states have call predecessors, (658), 156 states have return successors, (659), 634 states have call predecessors, (659), 657 states have call successors, (659) [2021-11-23 02:26:08,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2353 states to 2353 states and 3378 transitions. [2021-11-23 02:26:08,992 INFO L78 Accepts]: Start accepts. Automaton has 2353 states and 3378 transitions. Word has length 263 [2021-11-23 02:26:08,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:08,993 INFO L470 AbstractCegarLoop]: Abstraction has 2353 states and 3378 transitions. [2021-11-23 02:26:08,993 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 25.8) internal successors, (129), 5 states have internal predecessors, (129), 3 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) [2021-11-23 02:26:08,993 INFO L276 IsEmpty]: Start isEmpty. Operand 2353 states and 3378 transitions. [2021-11-23 02:26:09,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2021-11-23 02:26:09,000 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:09,001 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:09,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-11-23 02:26:09,001 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:09,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:09,002 INFO L85 PathProgramCache]: Analyzing trace with hash -773696391, now seen corresponding path program 1 times [2021-11-23 02:26:09,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:09,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [350987615] [2021-11-23 02:26:09,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:09,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:09,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:09,595 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-23 02:26:09,595 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:09,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [350987615] [2021-11-23 02:26:09,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [350987615] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:09,596 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:26:09,596 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:26:09,596 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542788472] [2021-11-23 02:26:09,596 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:09,597 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:26:09,597 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:09,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:26:09,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:26:09,597 INFO L87 Difference]: Start difference. First operand 2353 states and 3378 transitions. Second operand has 5 states, 5 states have (on average 26.0) internal successors, (130), 5 states have internal predecessors, (130), 3 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-23 02:26:13,193 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:26:18,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:18,357 INFO L93 Difference]: Finished difference Result 4701 states and 6750 transitions. [2021-11-23 02:26:18,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:26:18,362 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 26.0) internal successors, (130), 5 states have internal predecessors, (130), 3 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) Word has length 262 [2021-11-23 02:26:18,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:18,370 INFO L225 Difference]: With dead ends: 4701 [2021-11-23 02:26:18,370 INFO L226 Difference]: Without dead ends: 2350 [2021-11-23 02:26:18,375 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:26:18,376 INFO L933 BasicCegarLoop]: 1577 mSDtfsCounter, 553 mSDsluCounter, 3828 mSDsCounter, 0 mSdLazyCounter, 841 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 553 SdHoareTripleChecker+Valid, 5164 SdHoareTripleChecker+Invalid, 849 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 841 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:18,376 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [553 Valid, 5164 Invalid, 849 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 841 Invalid, 1 Unknown, 0 Unchecked, 8.5s Time] [2021-11-23 02:26:18,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2350 states. [2021-11-23 02:26:18,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2350 to 2347. [2021-11-23 02:26:18,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2347 states, 1534 states have (on average 1.3389830508474576) internal successors, (2054), 1589 states have internal predecessors, (2054), 656 states have call successors, (656), 155 states have call predecessors, (656), 156 states have return successors, (657), 632 states have call predecessors, (657), 655 states have call successors, (657) [2021-11-23 02:26:18,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2347 states to 2347 states and 3367 transitions. [2021-11-23 02:26:18,504 INFO L78 Accepts]: Start accepts. Automaton has 2347 states and 3367 transitions. Word has length 262 [2021-11-23 02:26:18,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:18,504 INFO L470 AbstractCegarLoop]: Abstraction has 2347 states and 3367 transitions. [2021-11-23 02:26:18,504 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 26.0) internal successors, (130), 5 states have internal predecessors, (130), 3 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-23 02:26:18,504 INFO L276 IsEmpty]: Start isEmpty. Operand 2347 states and 3367 transitions. [2021-11-23 02:26:18,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2021-11-23 02:26:18,511 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:18,511 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:18,512 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-11-23 02:26:18,512 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:18,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:18,513 INFO L85 PathProgramCache]: Analyzing trace with hash -348682658, now seen corresponding path program 1 times [2021-11-23 02:26:18,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:18,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712156199] [2021-11-23 02:26:18,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:18,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:18,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:19,197 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-23 02:26:19,197 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:19,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [712156199] [2021-11-23 02:26:19,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [712156199] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:19,198 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:26:19,198 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:26:19,199 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602616133] [2021-11-23 02:26:19,199 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:19,200 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:26:19,200 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:19,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:26:19,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:26:19,201 INFO L87 Difference]: Start difference. First operand 2347 states and 3367 transitions. Second operand has 6 states, 6 states have (on average 21.666666666666668) internal successors, (130), 6 states have internal predecessors, (130), 4 states have call successors, (40), 2 states have call predecessors, (40), 4 states have return successors, (38), 4 states have call predecessors, (38), 4 states have call successors, (38) [2021-11-23 02:26:21,880 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:26:38,600 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:26:38,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:38,756 INFO L93 Difference]: Finished difference Result 4692 states and 6736 transitions. [2021-11-23 02:26:38,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:26:38,760 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.666666666666668) internal successors, (130), 6 states have internal predecessors, (130), 4 states have call successors, (40), 2 states have call predecessors, (40), 4 states have return successors, (38), 4 states have call predecessors, (38), 4 states have call successors, (38) Word has length 264 [2021-11-23 02:26:38,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:38,767 INFO L225 Difference]: With dead ends: 4692 [2021-11-23 02:26:38,767 INFO L226 Difference]: Without dead ends: 2347 [2021-11-23 02:26:38,771 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:26:38,772 INFO L933 BasicCegarLoop]: 1544 mSDtfsCounter, 2507 mSDsluCounter, 1332 mSDsCounter, 0 mSdLazyCounter, 2191 mSolverCounterSat, 442 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2507 SdHoareTripleChecker+Valid, 2708 SdHoareTripleChecker+Invalid, 2635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 442 IncrementalHoareTripleChecker+Valid, 2191 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:38,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2507 Valid, 2708 Invalid, 2635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [442 Valid, 2191 Invalid, 2 Unknown, 0 Unchecked, 19.2s Time] [2021-11-23 02:26:38,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2347 states. [2021-11-23 02:26:38,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2347 to 2345. [2021-11-23 02:26:38,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2345 states, 1533 states have (on average 1.3385518590998042) internal successors, (2052), 1588 states have internal predecessors, (2052), 655 states have call successors, (655), 155 states have call predecessors, (655), 156 states have return successors, (656), 631 states have call predecessors, (656), 654 states have call successors, (656) [2021-11-23 02:26:38,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2345 states to 2345 states and 3363 transitions. [2021-11-23 02:26:38,907 INFO L78 Accepts]: Start accepts. Automaton has 2345 states and 3363 transitions. Word has length 264 [2021-11-23 02:26:38,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:38,907 INFO L470 AbstractCegarLoop]: Abstraction has 2345 states and 3363 transitions. [2021-11-23 02:26:38,907 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.666666666666668) internal successors, (130), 6 states have internal predecessors, (130), 4 states have call successors, (40), 2 states have call predecessors, (40), 4 states have return successors, (38), 4 states have call predecessors, (38), 4 states have call successors, (38) [2021-11-23 02:26:38,907 INFO L276 IsEmpty]: Start isEmpty. Operand 2345 states and 3363 transitions. [2021-11-23 02:26:38,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2021-11-23 02:26:38,912 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:38,912 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:38,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-11-23 02:26:38,912 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:38,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:38,913 INFO L85 PathProgramCache]: Analyzing trace with hash 97346625, now seen corresponding path program 1 times [2021-11-23 02:26:38,913 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:38,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206314235] [2021-11-23 02:26:38,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:38,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:39,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:39,577 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2021-11-23 02:26:39,577 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:39,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206314235] [2021-11-23 02:26:39,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [206314235] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:39,578 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:26:39,578 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:26:39,578 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060538834] [2021-11-23 02:26:39,578 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:39,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:26:39,579 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:39,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:26:39,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:26:39,580 INFO L87 Difference]: Start difference. First operand 2345 states and 3363 transitions. Second operand has 6 states, 6 states have (on average 21.833333333333332) internal successors, (131), 6 states have internal predecessors, (131), 3 states have call successors, (39), 2 states have call predecessors, (39), 4 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-23 02:26:42,661 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:27:02,096 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:27:02,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:02,263 INFO L93 Difference]: Finished difference Result 4685 states and 6721 transitions. [2021-11-23 02:27:02,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:27:02,267 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.833333333333332) internal successors, (131), 6 states have internal predecessors, (131), 3 states have call successors, (39), 2 states have call predecessors, (39), 4 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) Word has length 263 [2021-11-23 02:27:02,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:02,276 INFO L225 Difference]: With dead ends: 4685 [2021-11-23 02:27:02,276 INFO L226 Difference]: Without dead ends: 2342 [2021-11-23 02:27:02,281 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:27:02,281 INFO L933 BasicCegarLoop]: 1929 mSDtfsCounter, 1768 mSDsluCounter, 3410 mSDsCounter, 0 mSdLazyCounter, 3007 mSolverCounterSat, 15 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1768 SdHoareTripleChecker+Valid, 4984 SdHoareTripleChecker+Invalid, 3024 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 3007 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 22.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:02,282 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1768 Valid, 4984 Invalid, 3024 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 3007 Invalid, 2 Unknown, 0 Unchecked, 22.3s Time] [2021-11-23 02:27:02,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2342 states. [2021-11-23 02:27:02,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2342 to 2339. [2021-11-23 02:27:02,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2339 states, 1529 states have (on average 1.3374754741661217) internal successors, (2045), 1584 states have internal predecessors, (2045), 653 states have call successors, (653), 155 states have call predecessors, (653), 156 states have return successors, (654), 629 states have call predecessors, (654), 652 states have call successors, (654) [2021-11-23 02:27:02,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2339 states to 2339 states and 3352 transitions. [2021-11-23 02:27:02,412 INFO L78 Accepts]: Start accepts. Automaton has 2339 states and 3352 transitions. Word has length 263 [2021-11-23 02:27:02,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:02,412 INFO L470 AbstractCegarLoop]: Abstraction has 2339 states and 3352 transitions. [2021-11-23 02:27:02,413 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.833333333333332) internal successors, (131), 6 states have internal predecessors, (131), 3 states have call successors, (39), 2 states have call predecessors, (39), 4 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-23 02:27:02,413 INFO L276 IsEmpty]: Start isEmpty. Operand 2339 states and 3352 transitions. [2021-11-23 02:27:02,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2021-11-23 02:27:02,417 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:02,418 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:02,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-11-23 02:27:02,418 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:02,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:02,419 INFO L85 PathProgramCache]: Analyzing trace with hash 382602740, now seen corresponding path program 1 times [2021-11-23 02:27:02,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:02,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033318720] [2021-11-23 02:27:02,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:02,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:02,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:02,941 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-23 02:27:02,941 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:02,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033318720] [2021-11-23 02:27:02,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033318720] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:02,941 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:27:02,942 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:27:02,942 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094046670] [2021-11-23 02:27:02,942 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:02,943 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:27:02,943 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:02,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:27:02,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:27:02,944 INFO L87 Difference]: Start difference. First operand 2339 states and 3352 transitions. Second operand has 5 states, 5 states have (on average 26.2) internal successors, (131), 5 states have internal predecessors, (131), 3 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) [2021-11-23 02:27:06,402 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:27:11,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:11,740 INFO L93 Difference]: Finished difference Result 4676 states and 6705 transitions. [2021-11-23 02:27:11,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:27:11,760 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 26.2) internal successors, (131), 5 states have internal predecessors, (131), 3 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) Word has length 265 [2021-11-23 02:27:11,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:11,772 INFO L225 Difference]: With dead ends: 4676 [2021-11-23 02:27:11,772 INFO L226 Difference]: Without dead ends: 2339 [2021-11-23 02:27:11,780 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:27:11,780 INFO L933 BasicCegarLoop]: 1236 mSDtfsCounter, 1008 mSDsluCounter, 2832 mSDsCounter, 0 mSdLazyCounter, 795 mSolverCounterSat, 15 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1009 SdHoareTripleChecker+Valid, 3905 SdHoareTripleChecker+Invalid, 811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 795 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:11,781 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1009 Valid, 3905 Invalid, 811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 795 Invalid, 1 Unknown, 0 Unchecked, 8.6s Time] [2021-11-23 02:27:11,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2339 states. [2021-11-23 02:27:11,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2339 to 2337. [2021-11-23 02:27:11,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2337 states, 1528 states have (on average 1.337041884816754) internal successors, (2043), 1583 states have internal predecessors, (2043), 652 states have call successors, (652), 155 states have call predecessors, (652), 156 states have return successors, (653), 628 states have call predecessors, (653), 651 states have call successors, (653) [2021-11-23 02:27:11,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2337 states to 2337 states and 3348 transitions. [2021-11-23 02:27:11,923 INFO L78 Accepts]: Start accepts. Automaton has 2337 states and 3348 transitions. Word has length 265 [2021-11-23 02:27:11,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:11,924 INFO L470 AbstractCegarLoop]: Abstraction has 2337 states and 3348 transitions. [2021-11-23 02:27:11,924 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 26.2) internal successors, (131), 5 states have internal predecessors, (131), 3 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) [2021-11-23 02:27:11,924 INFO L276 IsEmpty]: Start isEmpty. Operand 2337 states and 3348 transitions. [2021-11-23 02:27:11,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2021-11-23 02:27:11,929 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:11,929 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:11,929 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-11-23 02:27:11,929 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:11,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:11,930 INFO L85 PathProgramCache]: Analyzing trace with hash 1626310007, now seen corresponding path program 1 times [2021-11-23 02:27:11,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:11,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903663163] [2021-11-23 02:27:11,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:11,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:12,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:12,471 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-23 02:27:12,471 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:12,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903663163] [2021-11-23 02:27:12,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [903663163] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:12,472 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:27:12,472 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:27:12,472 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557242519] [2021-11-23 02:27:12,472 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:12,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:27:12,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:12,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:27:12,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:27:12,473 INFO L87 Difference]: Start difference. First operand 2337 states and 3348 transitions. Second operand has 5 states, 5 states have (on average 26.4) internal successors, (132), 5 states have internal predecessors, (132), 3 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-23 02:27:15,591 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:27:22,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:22,106 INFO L93 Difference]: Finished difference Result 4669 states and 6690 transitions. [2021-11-23 02:27:22,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:27:22,110 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 26.4) internal successors, (132), 5 states have internal predecessors, (132), 3 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) Word has length 264 [2021-11-23 02:27:22,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:22,118 INFO L225 Difference]: With dead ends: 4669 [2021-11-23 02:27:22,118 INFO L226 Difference]: Without dead ends: 2334 [2021-11-23 02:27:22,123 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:27:22,123 INFO L933 BasicCegarLoop]: 1563 mSDtfsCounter, 818 mSDsluCounter, 2741 mSDsCounter, 0 mSdLazyCounter, 599 mSolverCounterSat, 218 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 818 SdHoareTripleChecker+Valid, 4129 SdHoareTripleChecker+Invalid, 818 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 218 IncrementalHoareTripleChecker+Valid, 599 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:22,124 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [818 Valid, 4129 Invalid, 818 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [218 Valid, 599 Invalid, 1 Unknown, 0 Unchecked, 9.4s Time] [2021-11-23 02:27:22,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2334 states. [2021-11-23 02:27:22,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2334 to 2331. [2021-11-23 02:27:22,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2331 states, 1524 states have (on average 1.3359580052493438) internal successors, (2036), 1579 states have internal predecessors, (2036), 650 states have call successors, (650), 155 states have call predecessors, (650), 156 states have return successors, (651), 626 states have call predecessors, (651), 649 states have call successors, (651) [2021-11-23 02:27:22,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2331 states to 2331 states and 3337 transitions. [2021-11-23 02:27:22,251 INFO L78 Accepts]: Start accepts. Automaton has 2331 states and 3337 transitions. Word has length 264 [2021-11-23 02:27:22,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:22,251 INFO L470 AbstractCegarLoop]: Abstraction has 2331 states and 3337 transitions. [2021-11-23 02:27:22,251 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 26.4) internal successors, (132), 5 states have internal predecessors, (132), 3 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-23 02:27:22,252 INFO L276 IsEmpty]: Start isEmpty. Operand 2331 states and 3337 transitions. [2021-11-23 02:27:22,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2021-11-23 02:27:22,256 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:22,256 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:22,256 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-11-23 02:27:22,256 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:22,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:22,257 INFO L85 PathProgramCache]: Analyzing trace with hash 1737274621, now seen corresponding path program 1 times [2021-11-23 02:27:22,257 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:22,257 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1884765377] [2021-11-23 02:27:22,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:22,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:22,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:22,889 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2021-11-23 02:27:22,889 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:22,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1884765377] [2021-11-23 02:27:22,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1884765377] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:22,889 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:27:22,890 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:27:22,890 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017464102] [2021-11-23 02:27:22,890 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:22,890 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:27:22,891 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:22,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:27:22,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:27:22,892 INFO L87 Difference]: Start difference. First operand 2331 states and 3337 transitions. Second operand has 5 states, 5 states have (on average 26.4) internal successors, (132), 5 states have internal predecessors, (132), 3 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) [2021-11-23 02:27:26,214 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:27:35,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:35,461 INFO L93 Difference]: Finished difference Result 4660 states and 6675 transitions. [2021-11-23 02:27:35,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:27:35,465 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 26.4) internal successors, (132), 5 states have internal predecessors, (132), 3 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) Word has length 266 [2021-11-23 02:27:35,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:35,473 INFO L225 Difference]: With dead ends: 4660 [2021-11-23 02:27:35,473 INFO L226 Difference]: Without dead ends: 2331 [2021-11-23 02:27:35,479 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:27:35,480 INFO L933 BasicCegarLoop]: 1223 mSDtfsCounter, 1563 mSDsluCounter, 2056 mSDsCounter, 0 mSdLazyCounter, 620 mSolverCounterSat, 424 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1564 SdHoareTripleChecker+Valid, 3161 SdHoareTripleChecker+Invalid, 1045 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 424 IncrementalHoareTripleChecker+Valid, 620 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:35,480 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1564 Valid, 3161 Invalid, 1045 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [424 Valid, 620 Invalid, 1 Unknown, 0 Unchecked, 12.3s Time] [2021-11-23 02:27:35,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2331 states. [2021-11-23 02:27:35,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2331 to 2329. [2021-11-23 02:27:35,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2329 states, 1523 states have (on average 1.335521996060407) internal successors, (2034), 1578 states have internal predecessors, (2034), 649 states have call successors, (649), 155 states have call predecessors, (649), 156 states have return successors, (650), 625 states have call predecessors, (650), 648 states have call successors, (650) [2021-11-23 02:27:35,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2329 states to 2329 states and 3333 transitions. [2021-11-23 02:27:35,622 INFO L78 Accepts]: Start accepts. Automaton has 2329 states and 3333 transitions. Word has length 266 [2021-11-23 02:27:35,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:35,623 INFO L470 AbstractCegarLoop]: Abstraction has 2329 states and 3333 transitions. [2021-11-23 02:27:35,623 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 26.4) internal successors, (132), 5 states have internal predecessors, (132), 3 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) [2021-11-23 02:27:35,624 INFO L276 IsEmpty]: Start isEmpty. Operand 2329 states and 3333 transitions. [2021-11-23 02:27:35,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2021-11-23 02:27:35,630 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:35,631 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:35,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-11-23 02:27:35,631 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:35,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:35,632 INFO L85 PathProgramCache]: Analyzing trace with hash 1507308712, now seen corresponding path program 1 times [2021-11-23 02:27:35,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:35,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208776995] [2021-11-23 02:27:35,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:35,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:35,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:36,121 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-23 02:27:36,121 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:36,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208776995] [2021-11-23 02:27:36,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1208776995] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:36,121 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:27:36,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:27:36,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201003533] [2021-11-23 02:27:36,122 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:36,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:27:36,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:36,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:27:36,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:27:36,123 INFO L87 Difference]: Start difference. First operand 2329 states and 3333 transitions. Second operand has 5 states, 5 states have (on average 26.4) internal successors, (132), 5 states have internal predecessors, (132), 3 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-23 02:27:39,739 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:27:45,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:45,684 INFO L93 Difference]: Finished difference Result 4653 states and 6660 transitions. [2021-11-23 02:27:45,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:27:45,691 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 26.4) internal successors, (132), 5 states have internal predecessors, (132), 3 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) Word has length 265 [2021-11-23 02:27:45,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:45,699 INFO L225 Difference]: With dead ends: 4653 [2021-11-23 02:27:45,700 INFO L226 Difference]: Without dead ends: 2326 [2021-11-23 02:27:45,706 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:27:45,707 INFO L933 BasicCegarLoop]: 1550 mSDtfsCounter, 504 mSDsluCounter, 3801 mSDsCounter, 0 mSdLazyCounter, 829 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 504 SdHoareTripleChecker+Valid, 5110 SdHoareTripleChecker+Invalid, 841 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 829 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:45,707 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [504 Valid, 5110 Invalid, 841 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 829 Invalid, 1 Unknown, 0 Unchecked, 9.3s Time] [2021-11-23 02:27:45,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2326 states. [2021-11-23 02:27:45,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2326 to 2323. [2021-11-23 02:27:45,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2323 states, 1519 states have (on average 1.3344305464121133) internal successors, (2027), 1574 states have internal predecessors, (2027), 647 states have call successors, (647), 155 states have call predecessors, (647), 156 states have return successors, (648), 623 states have call predecessors, (648), 646 states have call successors, (648) [2021-11-23 02:27:45,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2323 states to 2323 states and 3322 transitions. [2021-11-23 02:27:45,842 INFO L78 Accepts]: Start accepts. Automaton has 2323 states and 3322 transitions. Word has length 265 [2021-11-23 02:27:45,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:45,843 INFO L470 AbstractCegarLoop]: Abstraction has 2323 states and 3322 transitions. [2021-11-23 02:27:45,844 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 26.4) internal successors, (132), 5 states have internal predecessors, (132), 3 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-23 02:27:45,844 INFO L276 IsEmpty]: Start isEmpty. Operand 2323 states and 3322 transitions. [2021-11-23 02:27:45,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2021-11-23 02:27:45,851 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:45,851 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:45,852 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-11-23 02:27:45,852 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:45,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:45,853 INFO L85 PathProgramCache]: Analyzing trace with hash 1914523550, now seen corresponding path program 1 times [2021-11-23 02:27:45,853 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:45,853 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2092616638] [2021-11-23 02:27:45,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:45,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:46,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:46,344 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2021-11-23 02:27:46,344 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:46,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2092616638] [2021-11-23 02:27:46,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2092616638] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:46,344 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:27:46,345 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:27:46,345 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146081156] [2021-11-23 02:27:46,345 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:46,345 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:27:46,346 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:46,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:27:46,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:27:46,346 INFO L87 Difference]: Start difference. First operand 2323 states and 3322 transitions. Second operand has 5 states, 5 states have (on average 25.8) internal successors, (129), 4 states have internal predecessors, (129), 2 states have call successors, (40), 2 states have call predecessors, (40), 1 states have return successors, (38), 2 states have call predecessors, (38), 2 states have call successors, (38) [2021-11-23 02:27:49,459 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:27:51,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:51,668 INFO L93 Difference]: Finished difference Result 2729 states and 3898 transitions. [2021-11-23 02:27:51,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:27:51,670 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 25.8) internal successors, (129), 4 states have internal predecessors, (129), 2 states have call successors, (40), 2 states have call predecessors, (40), 1 states have return successors, (38), 2 states have call predecessors, (38), 2 states have call successors, (38) Word has length 267 [2021-11-23 02:27:51,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:51,678 INFO L225 Difference]: With dead ends: 2729 [2021-11-23 02:27:51,679 INFO L226 Difference]: Without dead ends: 2727 [2021-11-23 02:27:51,680 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:27:51,681 INFO L933 BasicCegarLoop]: 2031 mSDtfsCounter, 1302 mSDsluCounter, 5183 mSDsCounter, 0 mSdLazyCounter, 479 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1304 SdHoareTripleChecker+Valid, 6893 SdHoareTripleChecker+Invalid, 484 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 479 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:51,681 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1304 Valid, 6893 Invalid, 484 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 479 Invalid, 1 Unknown, 0 Unchecked, 5.1s Time] [2021-11-23 02:27:51,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2727 states. [2021-11-23 02:27:51,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2727 to 2722. [2021-11-23 02:27:51,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2722 states, 1783 states have (on average 1.3353897924845766) internal successors, (2381), 1848 states have internal predecessors, (2381), 755 states have call successors, (755), 182 states have call predecessors, (755), 183 states have return successors, (756), 727 states have call predecessors, (756), 754 states have call successors, (756) [2021-11-23 02:27:51,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2722 states to 2722 states and 3892 transitions. [2021-11-23 02:27:51,833 INFO L78 Accepts]: Start accepts. Automaton has 2722 states and 3892 transitions. Word has length 267 [2021-11-23 02:27:51,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:51,833 INFO L470 AbstractCegarLoop]: Abstraction has 2722 states and 3892 transitions. [2021-11-23 02:27:51,833 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 25.8) internal successors, (129), 4 states have internal predecessors, (129), 2 states have call successors, (40), 2 states have call predecessors, (40), 1 states have return successors, (38), 2 states have call predecessors, (38), 2 states have call successors, (38) [2021-11-23 02:27:51,834 INFO L276 IsEmpty]: Start isEmpty. Operand 2722 states and 3892 transitions. [2021-11-23 02:27:51,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 303 [2021-11-23 02:27:51,839 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:51,839 INFO L514 BasicCegarLoop]: trace histogram [11, 7, 6, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:51,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-11-23 02:27:51,840 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:51,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:51,840 INFO L85 PathProgramCache]: Analyzing trace with hash -1897797218, now seen corresponding path program 1 times [2021-11-23 02:27:51,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:51,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [469356384] [2021-11-23 02:27:51,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:51,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:51,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:52,407 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 7 proven. 5 refuted. 0 times theorem prover too weak. 227 trivial. 0 not checked. [2021-11-23 02:27:52,407 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:52,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [469356384] [2021-11-23 02:27:52,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [469356384] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:52,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [592353988] [2021-11-23 02:27:52,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:52,408 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:52,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:52,409 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:52,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:27:53,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:53,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 2357 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:27:53,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:54,750 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2021-11-23 02:27:54,751 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:27:54,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [592353988] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:54,751 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:27:54,751 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 8 [2021-11-23 02:27:54,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506270344] [2021-11-23 02:27:54,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:54,752 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:27:54,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:54,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:27:54,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:27:54,753 INFO L87 Difference]: Start difference. First operand 2722 states and 3892 transitions. Second operand has 5 states, 5 states have (on average 34.2) internal successors, (171), 5 states have internal predecessors, (171), 3 states have call successors, (50), 3 states have call predecessors, (50), 3 states have return successors, (48), 3 states have call predecessors, (48), 3 states have call successors, (48) [2021-11-23 02:27:58,160 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:28:09,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:09,828 INFO L93 Difference]: Finished difference Result 5440 states and 7787 transitions. [2021-11-23 02:28:09,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:28:09,833 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 34.2) internal successors, (171), 5 states have internal predecessors, (171), 3 states have call successors, (50), 3 states have call predecessors, (50), 3 states have return successors, (48), 3 states have call predecessors, (48), 3 states have call successors, (48) Word has length 302 [2021-11-23 02:28:09,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:09,842 INFO L225 Difference]: With dead ends: 5440 [2021-11-23 02:28:09,842 INFO L226 Difference]: Without dead ends: 2720 [2021-11-23 02:28:09,849 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 300 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:28:09,849 INFO L933 BasicCegarLoop]: 1213 mSDtfsCounter, 947 mSDsluCounter, 2449 mSDsCounter, 0 mSdLazyCounter, 1715 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 948 SdHoareTripleChecker+Valid, 3475 SdHoareTripleChecker+Invalid, 1723 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1715 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:09,849 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [948 Valid, 3475 Invalid, 1723 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1715 Invalid, 1 Unknown, 0 Unchecked, 14.7s Time] [2021-11-23 02:28:09,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2720 states. [2021-11-23 02:28:10,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2720 to 2716. [2021-11-23 02:28:10,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2716 states, 1780 states have (on average 1.3342696629213484) internal successors, (2375), 1845 states have internal predecessors, (2375), 752 states have call successors, (752), 182 states have call predecessors, (752), 183 states have return successors, (753), 724 states have call predecessors, (753), 751 states have call successors, (753) [2021-11-23 02:28:10,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2716 states to 2716 states and 3880 transitions. [2021-11-23 02:28:10,139 INFO L78 Accepts]: Start accepts. Automaton has 2716 states and 3880 transitions. Word has length 302 [2021-11-23 02:28:10,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:10,139 INFO L470 AbstractCegarLoop]: Abstraction has 2716 states and 3880 transitions. [2021-11-23 02:28:10,139 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 34.2) internal successors, (171), 5 states have internal predecessors, (171), 3 states have call successors, (50), 3 states have call predecessors, (50), 3 states have return successors, (48), 3 states have call predecessors, (48), 3 states have call successors, (48) [2021-11-23 02:28:10,139 INFO L276 IsEmpty]: Start isEmpty. Operand 2716 states and 3880 transitions. [2021-11-23 02:28:10,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2021-11-23 02:28:10,145 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:10,145 INFO L514 BasicCegarLoop]: trace histogram [9, 7, 6, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:28:10,176 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:28:10,345 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:10,346 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:10,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:10,349 INFO L85 PathProgramCache]: Analyzing trace with hash 449805820, now seen corresponding path program 1 times [2021-11-23 02:28:10,349 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:10,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351016853] [2021-11-23 02:28:10,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:10,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:10,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:11,054 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 193 trivial. 0 not checked. [2021-11-23 02:28:11,054 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:11,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351016853] [2021-11-23 02:28:11,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [351016853] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:11,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770238250] [2021-11-23 02:28:11,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:11,055 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:11,055 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:11,059 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:11,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:28:12,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:12,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 2345 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:28:12,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:13,816 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-11-23 02:28:13,816 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:28:13,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770238250] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:28:13,817 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:28:13,817 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-23 02:28:13,817 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874564393] [2021-11-23 02:28:13,817 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:28:13,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:28:13,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:13,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:28:13,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:28:13,818 INFO L87 Difference]: Start difference. First operand 2716 states and 3880 transitions. Second operand has 5 states, 5 states have (on average 35.4) internal successors, (177), 5 states have internal predecessors, (177), 3 states have call successors, (49), 3 states have call predecessors, (49), 3 states have return successors, (47), 3 states have call predecessors, (47), 3 states have call successors, (47) [2021-11-23 02:28:17,198 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:28:25,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:25,812 INFO L93 Difference]: Finished difference Result 5429 states and 7763 transitions. [2021-11-23 02:28:25,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:28:25,815 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 35.4) internal successors, (177), 5 states have internal predecessors, (177), 3 states have call successors, (49), 3 states have call predecessors, (49), 3 states have return successors, (47), 3 states have call predecessors, (47), 3 states have call successors, (47) Word has length 300 [2021-11-23 02:28:25,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:25,824 INFO L225 Difference]: With dead ends: 5429 [2021-11-23 02:28:25,824 INFO L226 Difference]: Without dead ends: 2715 [2021-11-23 02:28:25,830 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 298 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:28:25,831 INFO L933 BasicCegarLoop]: 1212 mSDtfsCounter, 933 mSDsluCounter, 2451 mSDsCounter, 0 mSdLazyCounter, 1711 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 934 SdHoareTripleChecker+Valid, 3476 SdHoareTripleChecker+Invalid, 1719 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1711 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:25,831 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [934 Valid, 3476 Invalid, 1719 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1711 Invalid, 1 Unknown, 0 Unchecked, 11.6s Time] [2021-11-23 02:28:25,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2715 states. [2021-11-23 02:28:25,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2715 to 2712. [2021-11-23 02:28:25,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2712 states, 1778 states have (on average 1.3335208098987628) internal successors, (2371), 1843 states have internal predecessors, (2371), 750 states have call successors, (750), 182 states have call predecessors, (750), 183 states have return successors, (751), 722 states have call predecessors, (751), 749 states have call successors, (751) [2021-11-23 02:28:25,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2712 states to 2712 states and 3872 transitions. [2021-11-23 02:28:25,983 INFO L78 Accepts]: Start accepts. Automaton has 2712 states and 3872 transitions. Word has length 300 [2021-11-23 02:28:25,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:25,983 INFO L470 AbstractCegarLoop]: Abstraction has 2712 states and 3872 transitions. [2021-11-23 02:28:25,983 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 35.4) internal successors, (177), 5 states have internal predecessors, (177), 3 states have call successors, (49), 3 states have call predecessors, (49), 3 states have return successors, (47), 3 states have call predecessors, (47), 3 states have call successors, (47) [2021-11-23 02:28:25,984 INFO L276 IsEmpty]: Start isEmpty. Operand 2712 states and 3872 transitions. [2021-11-23 02:28:25,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2021-11-23 02:28:25,989 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:25,989 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 6, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:28:26,021 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:28:26,190 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-23 02:28:26,190 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:26,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:26,191 INFO L85 PathProgramCache]: Analyzing trace with hash -1126755413, now seen corresponding path program 1 times [2021-11-23 02:28:26,191 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:26,191 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044807601] [2021-11-23 02:28:26,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:26,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:26,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:26,696 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2021-11-23 02:28:26,696 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:26,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044807601] [2021-11-23 02:28:26,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1044807601] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:26,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [806616904] [2021-11-23 02:28:26,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:26,697 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:26,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:26,698 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:26,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 02:28:27,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:27,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 2339 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:28:27,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:29,355 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-23 02:28:29,355 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:28:29,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [806616904] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:28:29,355 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:28:29,356 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-23 02:28:29,356 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236288851] [2021-11-23 02:28:29,356 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:28:29,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:28:29,359 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:29,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:28:29,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:28:29,360 INFO L87 Difference]: Start difference. First operand 2712 states and 3872 transitions. Second operand has 5 states, 5 states have (on average 35.8) internal successors, (179), 5 states have internal predecessors, (179), 3 states have call successors, (48), 3 states have call predecessors, (48), 3 states have return successors, (46), 3 states have call predecessors, (46), 3 states have call successors, (46) [2021-11-23 02:28:32,502 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:28:41,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:41,168 INFO L93 Difference]: Finished difference Result 5418 states and 7770 transitions. [2021-11-23 02:28:41,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:28:41,170 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 35.8) internal successors, (179), 5 states have internal predecessors, (179), 3 states have call successors, (48), 3 states have call predecessors, (48), 3 states have return successors, (46), 3 states have call predecessors, (46), 3 states have call successors, (46) Word has length 299 [2021-11-23 02:28:41,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:41,183 INFO L225 Difference]: With dead ends: 5418 [2021-11-23 02:28:41,183 INFO L226 Difference]: Without dead ends: 2708 [2021-11-23 02:28:41,192 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 297 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:28:41,193 INFO L933 BasicCegarLoop]: 1211 mSDtfsCounter, 920 mSDsluCounter, 2037 mSDsCounter, 0 mSdLazyCounter, 1661 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 921 SdHoareTripleChecker+Valid, 3071 SdHoareTripleChecker+Invalid, 1669 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1661 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:41,193 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [921 Valid, 3071 Invalid, 1669 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1661 Invalid, 1 Unknown, 0 Unchecked, 11.4s Time] [2021-11-23 02:28:41,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2708 states. [2021-11-23 02:28:41,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2708 to 2702. [2021-11-23 02:28:41,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2702 states, 1773 states have (on average 1.3316412859560067) internal successors, (2361), 1838 states have internal predecessors, (2361), 745 states have call successors, (745), 182 states have call predecessors, (745), 183 states have return successors, (746), 717 states have call predecessors, (746), 744 states have call successors, (746) [2021-11-23 02:28:41,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2702 states to 2702 states and 3852 transitions. [2021-11-23 02:28:41,339 INFO L78 Accepts]: Start accepts. Automaton has 2702 states and 3852 transitions. Word has length 299 [2021-11-23 02:28:41,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:41,340 INFO L470 AbstractCegarLoop]: Abstraction has 2702 states and 3852 transitions. [2021-11-23 02:28:41,340 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 35.8) internal successors, (179), 5 states have internal predecessors, (179), 3 states have call successors, (48), 3 states have call predecessors, (48), 3 states have return successors, (46), 3 states have call predecessors, (46), 3 states have call successors, (46) [2021-11-23 02:28:41,340 INFO L276 IsEmpty]: Start isEmpty. Operand 2702 states and 3852 transitions. [2021-11-23 02:28:41,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2021-11-23 02:28:41,346 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:41,346 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:28:41,373 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-11-23 02:28:41,546 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-23 02:28:41,547 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:41,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:41,547 INFO L85 PathProgramCache]: Analyzing trace with hash 977656852, now seen corresponding path program 1 times [2021-11-23 02:28:41,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:41,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223287903] [2021-11-23 02:28:41,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:41,548 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:41,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:42,017 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2021-11-23 02:28:42,017 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:42,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223287903] [2021-11-23 02:28:42,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1223287903] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:42,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [223550848] [2021-11-23 02:28:42,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:42,018 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:42,018 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:42,019 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:42,020 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 02:28:42,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:42,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 2341 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:28:42,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:44,940 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2021-11-23 02:28:44,941 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:28:44,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [223550848] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:28:44,941 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:28:44,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-23 02:28:44,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893225150] [2021-11-23 02:28:44,941 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:28:44,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:28:44,943 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:44,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:28:44,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:28:44,944 INFO L87 Difference]: Start difference. First operand 2702 states and 3852 transitions. Second operand has 5 states, 5 states have (on average 36.2) internal successors, (181), 5 states have internal predecessors, (181), 3 states have call successors, (48), 3 states have call predecessors, (48), 3 states have return successors, (46), 3 states have call predecessors, (46), 3 states have call successors, (46) [2021-11-23 02:28:48,145 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:28:57,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:57,992 INFO L93 Difference]: Finished difference Result 5402 states and 7708 transitions. [2021-11-23 02:28:57,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:28:57,994 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 36.2) internal successors, (181), 5 states have internal predecessors, (181), 3 states have call successors, (48), 3 states have call predecessors, (48), 3 states have return successors, (46), 3 states have call predecessors, (46), 3 states have call successors, (46) Word has length 300 [2021-11-23 02:28:57,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:58,009 INFO L225 Difference]: With dead ends: 5402 [2021-11-23 02:28:58,009 INFO L226 Difference]: Without dead ends: 2702 [2021-11-23 02:28:58,017 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 298 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:28:58,018 INFO L933 BasicCegarLoop]: 1210 mSDtfsCounter, 901 mSDsluCounter, 2036 mSDsCounter, 0 mSdLazyCounter, 1657 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 902 SdHoareTripleChecker+Valid, 3069 SdHoareTripleChecker+Invalid, 1665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1657 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:58,018 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [902 Valid, 3069 Invalid, 1665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1657 Invalid, 1 Unknown, 0 Unchecked, 12.5s Time] [2021-11-23 02:28:58,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2702 states. [2021-11-23 02:28:58,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2702 to 2700. [2021-11-23 02:28:58,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2700 states, 1772 states have (on average 1.3312641083521444) internal successors, (2359), 1837 states have internal predecessors, (2359), 744 states have call successors, (744), 182 states have call predecessors, (744), 183 states have return successors, (745), 716 states have call predecessors, (745), 743 states have call successors, (745) [2021-11-23 02:28:58,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2700 states to 2700 states and 3848 transitions. [2021-11-23 02:28:58,174 INFO L78 Accepts]: Start accepts. Automaton has 2700 states and 3848 transitions. Word has length 300 [2021-11-23 02:28:58,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:58,175 INFO L470 AbstractCegarLoop]: Abstraction has 2700 states and 3848 transitions. [2021-11-23 02:28:58,175 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 36.2) internal successors, (181), 5 states have internal predecessors, (181), 3 states have call successors, (48), 3 states have call predecessors, (48), 3 states have return successors, (46), 3 states have call predecessors, (46), 3 states have call successors, (46) [2021-11-23 02:28:58,175 INFO L276 IsEmpty]: Start isEmpty. Operand 2700 states and 3848 transitions. [2021-11-23 02:28:58,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2021-11-23 02:28:58,180 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:58,181 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:28:58,212 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:28:58,381 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-23 02:28:58,382 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:58,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:58,383 INFO L85 PathProgramCache]: Analyzing trace with hash 1031648313, now seen corresponding path program 1 times [2021-11-23 02:28:58,383 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:58,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1662848008] [2021-11-23 02:28:58,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:58,383 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:58,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:58,915 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2021-11-23 02:28:58,915 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:58,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1662848008] [2021-11-23 02:28:58,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1662848008] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:58,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [52633721] [2021-11-23 02:28:58,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:58,915 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:58,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:58,916 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:58,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 02:28:59,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:59,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 2335 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:28:59,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:29:02,541 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2021-11-23 02:29:02,541 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:29:02,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [52633721] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:29:02,541 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:29:02,541 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-23 02:29:02,542 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686936530] [2021-11-23 02:29:02,542 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:29:02,542 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:29:02,542 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:02,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:29:02,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:29:02,543 INFO L87 Difference]: Start difference. First operand 2700 states and 3848 transitions. Second operand has 5 states, 5 states have (on average 35.4) internal successors, (177), 5 states have internal predecessors, (177), 3 states have call successors, (47), 3 states have call predecessors, (47), 3 states have return successors, (45), 3 states have call predecessors, (45), 3 states have call successors, (45) [2021-11-23 02:29:05,999 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:29:16,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:16,883 INFO L93 Difference]: Finished difference Result 5398 states and 7698 transitions. [2021-11-23 02:29:16,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:29:16,887 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 35.4) internal successors, (177), 5 states have internal predecessors, (177), 3 states have call successors, (47), 3 states have call predecessors, (47), 3 states have return successors, (45), 3 states have call predecessors, (45), 3 states have call successors, (45) Word has length 299 [2021-11-23 02:29:16,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:16,897 INFO L225 Difference]: With dead ends: 5398 [2021-11-23 02:29:16,897 INFO L226 Difference]: Without dead ends: 2700 [2021-11-23 02:29:16,904 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 297 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:29:16,905 INFO L933 BasicCegarLoop]: 1209 mSDtfsCounter, 880 mSDsluCounter, 2457 mSDsCounter, 0 mSdLazyCounter, 1699 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 881 SdHoareTripleChecker+Valid, 3479 SdHoareTripleChecker+Invalid, 1707 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1699 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:16,905 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [881 Valid, 3479 Invalid, 1707 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1699 Invalid, 1 Unknown, 0 Unchecked, 13.9s Time] [2021-11-23 02:29:16,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2700 states. [2021-11-23 02:29:17,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2700 to 2698. [2021-11-23 02:29:17,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2698 states, 1771 states have (on average 1.3308865047995482) internal successors, (2357), 1836 states have internal predecessors, (2357), 743 states have call successors, (743), 182 states have call predecessors, (743), 183 states have return successors, (744), 715 states have call predecessors, (744), 742 states have call successors, (744) [2021-11-23 02:29:17,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2698 states to 2698 states and 3844 transitions. [2021-11-23 02:29:17,063 INFO L78 Accepts]: Start accepts. Automaton has 2698 states and 3844 transitions. Word has length 299 [2021-11-23 02:29:17,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:17,064 INFO L470 AbstractCegarLoop]: Abstraction has 2698 states and 3844 transitions. [2021-11-23 02:29:17,064 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 35.4) internal successors, (177), 5 states have internal predecessors, (177), 3 states have call successors, (47), 3 states have call predecessors, (47), 3 states have return successors, (45), 3 states have call predecessors, (45), 3 states have call successors, (45) [2021-11-23 02:29:17,064 INFO L276 IsEmpty]: Start isEmpty. Operand 2698 states and 3844 transitions. [2021-11-23 02:29:17,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2021-11-23 02:29:17,068 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:17,069 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 5, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:29:17,099 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-11-23 02:29:17,269 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-23 02:29:17,270 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:29:17,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:29:17,270 INFO L85 PathProgramCache]: Analyzing trace with hash 1032892910, now seen corresponding path program 1 times [2021-11-23 02:29:17,270 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:29:17,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [343119528] [2021-11-23 02:29:17,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:17,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:29:17,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:17,789 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2021-11-23 02:29:17,790 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:29:17,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [343119528] [2021-11-23 02:29:17,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [343119528] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:29:17,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567783501] [2021-11-23 02:29:17,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:17,791 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:17,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:29:17,792 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:29:17,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 02:29:18,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:18,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 2329 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:29:18,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:29:21,750 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 02:29:21,750 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:29:21,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [567783501] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:29:21,750 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:29:21,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-23 02:29:21,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960674149] [2021-11-23 02:29:21,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:29:21,751 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:29:21,751 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:21,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:29:21,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:29:21,752 INFO L87 Difference]: Start difference. First operand 2698 states and 3844 transitions. Second operand has 5 states, 5 states have (on average 35.8) internal successors, (179), 5 states have internal predecessors, (179), 3 states have call successors, (46), 3 states have call predecessors, (46), 3 states have return successors, (44), 3 states have call predecessors, (44), 3 states have call successors, (44) [2021-11-23 02:29:25,009 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:29:35,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:35,944 INFO L93 Difference]: Finished difference Result 5392 states and 7690 transitions. [2021-11-23 02:29:35,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:29:35,948 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 35.8) internal successors, (179), 5 states have internal predecessors, (179), 3 states have call successors, (46), 3 states have call predecessors, (46), 3 states have return successors, (44), 3 states have call predecessors, (44), 3 states have call successors, (44) Word has length 298 [2021-11-23 02:29:35,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:35,957 INFO L225 Difference]: With dead ends: 5392 [2021-11-23 02:29:35,957 INFO L226 Difference]: Without dead ends: 2696 [2021-11-23 02:29:35,963 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 296 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:29:35,964 INFO L933 BasicCegarLoop]: 1205 mSDtfsCounter, 868 mSDsluCounter, 2031 mSDsCounter, 0 mSdLazyCounter, 1649 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 869 SdHoareTripleChecker+Valid, 3059 SdHoareTripleChecker+Invalid, 1657 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1649 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:35,964 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [869 Valid, 3059 Invalid, 1657 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1649 Invalid, 1 Unknown, 0 Unchecked, 13.8s Time] [2021-11-23 02:29:35,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2696 states. [2021-11-23 02:29:36,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2696 to 2692. [2021-11-23 02:29:36,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2692 states, 1768 states have (on average 1.3297511312217194) internal successors, (2351), 1833 states have internal predecessors, (2351), 740 states have call successors, (740), 182 states have call predecessors, (740), 183 states have return successors, (741), 712 states have call predecessors, (741), 739 states have call successors, (741) [2021-11-23 02:29:36,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2692 states to 2692 states and 3832 transitions. [2021-11-23 02:29:36,104 INFO L78 Accepts]: Start accepts. Automaton has 2692 states and 3832 transitions. Word has length 298 [2021-11-23 02:29:36,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:36,105 INFO L470 AbstractCegarLoop]: Abstraction has 2692 states and 3832 transitions. [2021-11-23 02:29:36,105 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 35.8) internal successors, (179), 5 states have internal predecessors, (179), 3 states have call successors, (46), 3 states have call predecessors, (46), 3 states have return successors, (44), 3 states have call predecessors, (44), 3 states have call successors, (44) [2021-11-23 02:29:36,105 INFO L276 IsEmpty]: Start isEmpty. Operand 2692 states and 3832 transitions. [2021-11-23 02:29:36,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2021-11-23 02:29:36,109 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:36,109 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:29:36,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 02:29:36,309 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:36,310 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:29:36,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:29:36,310 INFO L85 PathProgramCache]: Analyzing trace with hash -165617611, now seen corresponding path program 1 times [2021-11-23 02:29:36,311 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:29:36,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2005353475] [2021-11-23 02:29:36,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:36,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:29:36,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:36,806 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 133 trivial. 0 not checked. [2021-11-23 02:29:36,806 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:29:36,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2005353475] [2021-11-23 02:29:36,806 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2005353475] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:29:36,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1082739889] [2021-11-23 02:29:36,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:36,807 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:36,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:29:36,808 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:29:36,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 02:29:37,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:37,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 2323 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:29:37,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:29:40,893 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2021-11-23 02:29:40,893 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:29:40,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1082739889] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:29:40,893 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:29:40,894 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-23 02:29:40,894 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45875283] [2021-11-23 02:29:40,894 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:29:40,895 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:29:40,895 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:40,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:29:40,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:29:40,896 INFO L87 Difference]: Start difference. First operand 2692 states and 3832 transitions. Second operand has 5 states, 5 states have (on average 36.2) internal successors, (181), 5 states have internal predecessors, (181), 3 states have call successors, (45), 3 states have call predecessors, (45), 3 states have return successors, (43), 3 states have call predecessors, (43), 3 states have call successors, (43) [2021-11-23 02:29:44,356 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:29:56,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:56,263 INFO L93 Difference]: Finished difference Result 5380 states and 7666 transitions. [2021-11-23 02:29:56,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:29:56,266 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 36.2) internal successors, (181), 5 states have internal predecessors, (181), 3 states have call successors, (45), 3 states have call predecessors, (45), 3 states have return successors, (43), 3 states have call predecessors, (43), 3 states have call successors, (43) Word has length 297 [2021-11-23 02:29:56,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:56,280 INFO L225 Difference]: With dead ends: 5380 [2021-11-23 02:29:56,280 INFO L226 Difference]: Without dead ends: 2690 [2021-11-23 02:29:56,288 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 295 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:29:56,289 INFO L933 BasicCegarLoop]: 1201 mSDtfsCounter, 855 mSDsluCounter, 2450 mSDsCounter, 0 mSdLazyCounter, 1688 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 856 SdHoareTripleChecker+Valid, 3464 SdHoareTripleChecker+Invalid, 1696 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1688 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:56,290 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [856 Valid, 3464 Invalid, 1696 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1688 Invalid, 1 Unknown, 0 Unchecked, 14.9s Time] [2021-11-23 02:29:56,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2690 states. [2021-11-23 02:29:56,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2690 to 2686. [2021-11-23 02:29:56,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2686 states, 1765 states have (on average 1.3286118980169972) internal successors, (2345), 1830 states have internal predecessors, (2345), 737 states have call successors, (737), 182 states have call predecessors, (737), 183 states have return successors, (738), 709 states have call predecessors, (738), 736 states have call successors, (738) [2021-11-23 02:29:56,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2686 states to 2686 states and 3820 transitions. [2021-11-23 02:29:56,457 INFO L78 Accepts]: Start accepts. Automaton has 2686 states and 3820 transitions. Word has length 297 [2021-11-23 02:29:56,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:56,457 INFO L470 AbstractCegarLoop]: Abstraction has 2686 states and 3820 transitions. [2021-11-23 02:29:56,457 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 36.2) internal successors, (181), 5 states have internal predecessors, (181), 3 states have call successors, (45), 3 states have call predecessors, (45), 3 states have return successors, (43), 3 states have call predecessors, (43), 3 states have call successors, (43) [2021-11-23 02:29:56,457 INFO L276 IsEmpty]: Start isEmpty. Operand 2686 states and 3820 transitions. [2021-11-23 02:29:56,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2021-11-23 02:29:56,461 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:56,461 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:29:56,491 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-11-23 02:29:56,662 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:56,662 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:29:56,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:29:56,663 INFO L85 PathProgramCache]: Analyzing trace with hash -2110033302, now seen corresponding path program 1 times [2021-11-23 02:29:56,663 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:29:56,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [769768073] [2021-11-23 02:29:56,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:56,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:29:56,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:57,162 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 127 trivial. 0 not checked. [2021-11-23 02:29:57,162 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:29:57,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [769768073] [2021-11-23 02:29:57,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [769768073] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:29:57,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [162632014] [2021-11-23 02:29:57,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:57,163 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:57,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:29:57,164 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:29:57,165 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 02:29:58,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:58,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 2317 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:29:58,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:30:01,561 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-23 02:30:01,561 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:30:01,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [162632014] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:30:01,561 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:30:01,561 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-23 02:30:01,562 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362536829] [2021-11-23 02:30:01,562 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:30:01,562 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:30:01,562 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:01,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:30:01,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:30:01,563 INFO L87 Difference]: Start difference. First operand 2686 states and 3820 transitions. Second operand has 5 states, 5 states have (on average 36.6) internal successors, (183), 5 states have internal predecessors, (183), 3 states have call successors, (44), 3 states have call predecessors, (44), 3 states have return successors, (42), 3 states have call predecessors, (42), 3 states have call successors, (42) [2021-11-23 02:30:04,990 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:30:17,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:30:17,476 INFO L93 Difference]: Finished difference Result 5368 states and 7642 transitions. [2021-11-23 02:30:17,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:30:17,480 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 36.6) internal successors, (183), 5 states have internal predecessors, (183), 3 states have call successors, (44), 3 states have call predecessors, (44), 3 states have return successors, (42), 3 states have call predecessors, (42), 3 states have call successors, (42) Word has length 296 [2021-11-23 02:30:17,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:30:17,489 INFO L225 Difference]: With dead ends: 5368 [2021-11-23 02:30:17,489 INFO L226 Difference]: Without dead ends: 2684 [2021-11-23 02:30:17,495 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 294 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:30:17,496 INFO L933 BasicCegarLoop]: 1200 mSDtfsCounter, 843 mSDsluCounter, 2451 mSDsCounter, 0 mSdLazyCounter, 1687 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 844 SdHoareTripleChecker+Valid, 3464 SdHoareTripleChecker+Invalid, 1695 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1687 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:30:17,496 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [844 Valid, 3464 Invalid, 1695 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1687 Invalid, 1 Unknown, 0 Unchecked, 15.4s Time] [2021-11-23 02:30:17,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2684 states. [2021-11-23 02:30:17,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2684 to 2680. [2021-11-23 02:30:17,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2680 states, 1762 states have (on average 1.3274687854710556) internal successors, (2339), 1827 states have internal predecessors, (2339), 734 states have call successors, (734), 182 states have call predecessors, (734), 183 states have return successors, (735), 706 states have call predecessors, (735), 733 states have call successors, (735) [2021-11-23 02:30:17,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2680 states to 2680 states and 3808 transitions. [2021-11-23 02:30:17,630 INFO L78 Accepts]: Start accepts. Automaton has 2680 states and 3808 transitions. Word has length 296 [2021-11-23 02:30:17,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:30:17,631 INFO L470 AbstractCegarLoop]: Abstraction has 2680 states and 3808 transitions. [2021-11-23 02:30:17,631 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 36.6) internal successors, (183), 5 states have internal predecessors, (183), 3 states have call successors, (44), 3 states have call predecessors, (44), 3 states have return successors, (42), 3 states have call predecessors, (42), 3 states have call successors, (42) [2021-11-23 02:30:17,631 INFO L276 IsEmpty]: Start isEmpty. Operand 2680 states and 3808 transitions. [2021-11-23 02:30:17,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 296 [2021-11-23 02:30:17,634 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:30:17,635 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:30:17,664 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 02:30:17,835 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:17,835 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:17,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:17,836 INFO L85 PathProgramCache]: Analyzing trace with hash 781311395, now seen corresponding path program 1 times [2021-11-23 02:30:17,836 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:17,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1816735345] [2021-11-23 02:30:17,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:17,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:17,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:18,310 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 123 trivial. 0 not checked. [2021-11-23 02:30:18,310 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:18,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1816735345] [2021-11-23 02:30:18,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1816735345] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:30:18,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [939146785] [2021-11-23 02:30:18,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:18,310 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:18,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:30:18,311 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:30:18,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 02:30:19,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:19,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 2311 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:30:19,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:30:22,722 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-23 02:30:22,722 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:30:22,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [939146785] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:30:22,722 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:30:22,722 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-23 02:30:22,723 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798121743] [2021-11-23 02:30:22,723 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:30:22,723 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:30:22,723 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:22,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:30:22,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:30:22,724 INFO L87 Difference]: Start difference. First operand 2680 states and 3808 transitions. Second operand has 5 states, 5 states have (on average 37.0) internal successors, (185), 5 states have internal predecessors, (185), 3 states have call successors, (43), 3 states have call predecessors, (43), 3 states have return successors, (41), 3 states have call predecessors, (41), 3 states have call successors, (41) [2021-11-23 02:30:25,941 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:30:38,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:30:38,444 INFO L93 Difference]: Finished difference Result 5356 states and 7620 transitions. [2021-11-23 02:30:38,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:30:38,448 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 37.0) internal successors, (185), 5 states have internal predecessors, (185), 3 states have call successors, (43), 3 states have call predecessors, (43), 3 states have return successors, (41), 3 states have call predecessors, (41), 3 states have call successors, (41) Word has length 295 [2021-11-23 02:30:38,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:30:38,457 INFO L225 Difference]: With dead ends: 5356 [2021-11-23 02:30:38,458 INFO L226 Difference]: Without dead ends: 2678 [2021-11-23 02:30:38,464 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 293 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:30:38,464 INFO L933 BasicCegarLoop]: 1199 mSDtfsCounter, 831 mSDsluCounter, 2453 mSDsCounter, 0 mSdLazyCounter, 1683 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 832 SdHoareTripleChecker+Valid, 3465 SdHoareTripleChecker+Invalid, 1691 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1683 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:30:38,465 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [832 Valid, 3465 Invalid, 1691 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1683 Invalid, 1 Unknown, 0 Unchecked, 15.3s Time] [2021-11-23 02:30:38,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2678 states. [2021-11-23 02:30:38,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2678 to 2674. [2021-11-23 02:30:38,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2674 states, 1759 states have (on average 1.3263217737350768) internal successors, (2333), 1824 states have internal predecessors, (2333), 731 states have call successors, (731), 182 states have call predecessors, (731), 183 states have return successors, (732), 703 states have call predecessors, (732), 730 states have call successors, (732) [2021-11-23 02:30:38,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2674 states to 2674 states and 3796 transitions. [2021-11-23 02:30:38,616 INFO L78 Accepts]: Start accepts. Automaton has 2674 states and 3796 transitions. Word has length 295 [2021-11-23 02:30:38,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:30:38,617 INFO L470 AbstractCegarLoop]: Abstraction has 2674 states and 3796 transitions. [2021-11-23 02:30:38,617 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 37.0) internal successors, (185), 5 states have internal predecessors, (185), 3 states have call successors, (43), 3 states have call predecessors, (43), 3 states have return successors, (41), 3 states have call predecessors, (41), 3 states have call successors, (41) [2021-11-23 02:30:38,617 INFO L276 IsEmpty]: Start isEmpty. Operand 2674 states and 3796 transitions. [2021-11-23 02:30:38,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2021-11-23 02:30:38,621 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:30:38,621 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:30:38,652 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 02:30:38,822 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-11-23 02:30:38,822 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:38,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:38,823 INFO L85 PathProgramCache]: Analyzing trace with hash -812590192, now seen corresponding path program 1 times [2021-11-23 02:30:38,823 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:38,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1695563537] [2021-11-23 02:30:38,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:38,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:38,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:39,379 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-23 02:30:39,379 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:39,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1695563537] [2021-11-23 02:30:39,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1695563537] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:30:39,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [969478844] [2021-11-23 02:30:39,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:39,380 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:39,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:30:39,381 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:30:39,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 02:30:40,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:40,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 2305 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:30:40,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:30:44,777 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-23 02:30:44,777 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:30:44,777 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [969478844] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:30:44,778 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:30:44,778 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-23 02:30:44,778 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342662279] [2021-11-23 02:30:44,778 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:30:44,779 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:30:44,779 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:44,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:30:44,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:30:44,780 INFO L87 Difference]: Start difference. First operand 2674 states and 3796 transitions. Second operand has 5 states, 5 states have (on average 37.4) internal successors, (187), 5 states have internal predecessors, (187), 3 states have call successors, (42), 3 states have call predecessors, (42), 3 states have return successors, (40), 3 states have call predecessors, (40), 3 states have call successors, (40) [2021-11-23 02:30:48,360 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:31:02,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:02,293 INFO L93 Difference]: Finished difference Result 5345 states and 7595 transitions. [2021-11-23 02:31:02,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:31:02,297 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 37.4) internal successors, (187), 5 states have internal predecessors, (187), 3 states have call successors, (42), 3 states have call predecessors, (42), 3 states have return successors, (40), 3 states have call predecessors, (40), 3 states have call successors, (40) Word has length 294 [2021-11-23 02:31:02,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:02,307 INFO L225 Difference]: With dead ends: 5345 [2021-11-23 02:31:02,307 INFO L226 Difference]: Without dead ends: 2673 [2021-11-23 02:31:02,314 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 292 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:31:02,315 INFO L933 BasicCegarLoop]: 1198 mSDtfsCounter, 819 mSDsluCounter, 2455 mSDsCounter, 0 mSdLazyCounter, 1679 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 820 SdHoareTripleChecker+Valid, 3466 SdHoareTripleChecker+Invalid, 1687 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1679 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:02,315 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [820 Valid, 3466 Invalid, 1687 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1679 Invalid, 1 Unknown, 0 Unchecked, 17.0s Time] [2021-11-23 02:31:02,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2673 states. [2021-11-23 02:31:02,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2673 to 2670. [2021-11-23 02:31:02,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2670 states, 1757 states have (on average 1.325554923164485) internal successors, (2329), 1822 states have internal predecessors, (2329), 729 states have call successors, (729), 182 states have call predecessors, (729), 183 states have return successors, (730), 701 states have call predecessors, (730), 728 states have call successors, (730) [2021-11-23 02:31:02,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2670 states to 2670 states and 3788 transitions. [2021-11-23 02:31:02,467 INFO L78 Accepts]: Start accepts. Automaton has 2670 states and 3788 transitions. Word has length 294 [2021-11-23 02:31:02,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:02,468 INFO L470 AbstractCegarLoop]: Abstraction has 2670 states and 3788 transitions. [2021-11-23 02:31:02,468 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 37.4) internal successors, (187), 5 states have internal predecessors, (187), 3 states have call successors, (42), 3 states have call predecessors, (42), 3 states have return successors, (40), 3 states have call predecessors, (40), 3 states have call successors, (40) [2021-11-23 02:31:02,468 INFO L276 IsEmpty]: Start isEmpty. Operand 2670 states and 3788 transitions. [2021-11-23 02:31:02,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2021-11-23 02:31:02,472 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:02,472 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:31:02,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 02:31:02,672 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-11-23 02:31:02,673 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:02,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:02,673 INFO L85 PathProgramCache]: Analyzing trace with hash -1875003571, now seen corresponding path program 1 times [2021-11-23 02:31:02,673 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:02,673 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [432586362] [2021-11-23 02:31:02,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:02,674 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:02,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:03,217 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-23 02:31:03,217 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:03,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [432586362] [2021-11-23 02:31:03,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [432586362] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:31:03,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [732940056] [2021-11-23 02:31:03,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:03,217 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:03,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:31:03,219 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:31:03,220 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 02:31:04,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:04,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 2299 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:31:04,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:31:06,813 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-23 02:31:06,813 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:31:06,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [732940056] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:31:06,813 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:31:06,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-23 02:31:06,814 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128488023] [2021-11-23 02:31:06,814 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:31:06,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:31:06,816 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:06,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:31:06,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:31:06,817 INFO L87 Difference]: Start difference. First operand 2670 states and 3788 transitions. Second operand has 5 states, 5 states have (on average 38.6) internal successors, (193), 5 states have internal predecessors, (193), 3 states have call successors, (41), 3 states have call predecessors, (41), 3 states have return successors, (39), 3 states have call predecessors, (39), 3 states have call successors, (39) [2021-11-23 02:31:09,745 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:31:21,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:21,127 INFO L93 Difference]: Finished difference Result 5336 states and 7602 transitions. [2021-11-23 02:31:21,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:31:21,133 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 38.6) internal successors, (193), 5 states have internal predecessors, (193), 3 states have call successors, (41), 3 states have call predecessors, (41), 3 states have return successors, (39), 3 states have call predecessors, (39), 3 states have call successors, (39) Word has length 293 [2021-11-23 02:31:21,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:21,142 INFO L225 Difference]: With dead ends: 5336 [2021-11-23 02:31:21,142 INFO L226 Difference]: Without dead ends: 2668 [2021-11-23 02:31:21,148 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 291 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:31:21,149 INFO L933 BasicCegarLoop]: 1185 mSDtfsCounter, 1210 mSDsluCounter, 1418 mSDsCounter, 0 mSdLazyCounter, 1202 mSolverCounterSat, 24 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1211 SdHoareTripleChecker+Valid, 2464 SdHoareTripleChecker+Invalid, 1227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 1202 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:21,149 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1211 Valid, 2464 Invalid, 1227 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 1202 Invalid, 1 Unknown, 0 Unchecked, 14.1s Time] [2021-11-23 02:31:21,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2668 states. [2021-11-23 02:31:21,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2668 to 2660. [2021-11-23 02:31:21,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2660 states, 1752 states have (on average 1.3236301369863013) internal successors, (2319), 1817 states have internal predecessors, (2319), 724 states have call successors, (724), 182 states have call predecessors, (724), 183 states have return successors, (725), 696 states have call predecessors, (725), 723 states have call successors, (725) [2021-11-23 02:31:21,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2660 states to 2660 states and 3768 transitions. [2021-11-23 02:31:21,279 INFO L78 Accepts]: Start accepts. Automaton has 2660 states and 3768 transitions. Word has length 293 [2021-11-23 02:31:21,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:21,279 INFO L470 AbstractCegarLoop]: Abstraction has 2660 states and 3768 transitions. [2021-11-23 02:31:21,280 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 38.6) internal successors, (193), 5 states have internal predecessors, (193), 3 states have call successors, (41), 3 states have call predecessors, (41), 3 states have return successors, (39), 3 states have call predecessors, (39), 3 states have call successors, (39) [2021-11-23 02:31:21,280 INFO L276 IsEmpty]: Start isEmpty. Operand 2660 states and 3768 transitions. [2021-11-23 02:31:21,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2021-11-23 02:31:21,283 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:21,283 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:31:21,308 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 02:31:21,483 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-11-23 02:31:21,484 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:21,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:21,484 INFO L85 PathProgramCache]: Analyzing trace with hash 836544455, now seen corresponding path program 1 times [2021-11-23 02:31:21,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:21,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640145436] [2021-11-23 02:31:21,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:21,485 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:21,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:21,997 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-23 02:31:21,997 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:21,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640145436] [2021-11-23 02:31:21,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640145436] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:31:21,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [648083639] [2021-11-23 02:31:21,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:21,998 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:21,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:31:22,006 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:31:22,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8744da5c-21b3-455a-b9de-60f2fd5ebe90/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 02:31:22,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:22,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 2291 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:31:22,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:31:24,142 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2021-11-23 02:31:24,143 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:31:24,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [648083639] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:31:24,143 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:31:24,144 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 8 [2021-11-23 02:31:24,144 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410386002] [2021-11-23 02:31:24,144 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:31:24,145 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:31:24,145 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:24,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:31:24,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:31:24,146 INFO L87 Difference]: Start difference. First operand 2660 states and 3768 transitions. Second operand has 5 states, 5 states have (on average 38.0) internal successors, (190), 5 states have internal predecessors, (190), 3 states have call successors, (40), 3 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) [2021-11-23 02:31:27,415 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers []