./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec3_product26.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec3_product26.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 64b60b46be25872d2112a950c23ddbe99bccee21bea4e463fd90753650d2a7bd --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:34:47,110 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:34:47,112 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:34:47,143 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:34:47,144 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:34:47,145 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:34:47,147 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:34:47,149 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:34:47,151 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:34:47,152 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:34:47,154 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:34:47,155 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:34:47,156 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:34:47,157 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:34:47,159 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:34:47,160 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:34:47,161 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:34:47,162 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:34:47,164 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:34:47,167 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:34:47,169 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:34:47,171 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:34:47,172 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:34:47,173 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:34:47,177 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:34:47,177 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:34:47,178 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:34:47,179 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:34:47,180 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:34:47,181 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:34:47,181 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:34:47,182 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:34:47,183 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:34:47,184 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:34:47,185 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:34:47,186 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:34:47,187 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:34:47,187 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:34:47,188 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:34:47,189 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:34:47,190 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:34:47,191 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:34:47,218 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:34:47,219 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:34:47,223 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:34:47,223 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:34:47,224 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:34:47,224 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:34:47,224 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:34:47,224 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:34:47,224 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:34:47,225 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:34:47,225 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:34:47,225 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:34:47,226 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:34:47,226 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:34:47,226 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:34:47,226 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:34:47,227 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:34:47,227 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:34:47,228 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:34:47,228 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:34:47,228 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:34:47,228 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:34:47,228 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:34:47,229 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:34:47,229 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:34:47,229 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:34:47,230 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:34:47,231 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:34:47,231 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:34:47,232 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:34:47,232 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:34:47,232 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:34:47,233 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:34:47,233 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:34:47,233 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:34:47,233 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:34:47,234 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:34:47,234 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:34:47,235 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:34:47,235 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:34:47,235 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:34:47,235 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_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 64b60b46be25872d2112a950c23ddbe99bccee21bea4e463fd90753650d2a7bd [2021-11-25 19:34:47,524 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:34:47,550 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:34:47,552 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:34:47,553 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:34:47,554 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:34:47,555 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/product-lines/elevator_spec3_product26.cil.c [2021-11-25 19:34:47,649 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/data/5b2be232f/c48ed9a622ae4f75b19843ee381e96f2/FLAGd8d0c8cf7 [2021-11-25 19:34:48,226 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:34:48,227 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/sv-benchmarks/c/product-lines/elevator_spec3_product26.cil.c [2021-11-25 19:34:48,256 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/data/5b2be232f/c48ed9a622ae4f75b19843ee381e96f2/FLAGd8d0c8cf7 [2021-11-25 19:34:48,464 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/data/5b2be232f/c48ed9a622ae4f75b19843ee381e96f2 [2021-11-25 19:34:48,466 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:34:48,468 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:34:48,469 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:34:48,469 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:34:48,473 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:34:48,473 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:34:48" (1/1) ... [2021-11-25 19:34:48,474 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f4ef817 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:34:48, skipping insertion in model container [2021-11-25 19:34:48,475 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:34:48" (1/1) ... [2021-11-25 19:34:48,486 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:34:48,572 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:34:49,150 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_ff2ad500-fc1b-403a-a133-ad13a6daf659/sv-benchmarks/c/product-lines/elevator_spec3_product26.cil.c[67702,67715] [2021-11-25 19:34:49,159 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:34:49,168 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:34:49,256 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_ff2ad500-fc1b-403a-a133-ad13a6daf659/sv-benchmarks/c/product-lines/elevator_spec3_product26.cil.c[67702,67715] [2021-11-25 19:34:49,261 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:34:49,290 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:34:49,290 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:34:49 WrapperNode [2021-11-25 19:34:49,290 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:34:49,291 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:34:49,292 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:34:49,292 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:34:49,299 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:34:49" (1/1) ... [2021-11-25 19:34:49,326 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:34:49" (1/1) ... [2021-11-25 19:34:49,389 INFO L137 Inliner]: procedures = 91, calls = 346, calls flagged for inlining = 27, calls inlined = 23, statements flattened = 863 [2021-11-25 19:34:49,389 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:34:49,390 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:34:49,390 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:34:49,390 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:34:49,409 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:34:49" (1/1) ... [2021-11-25 19:34:49,409 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:34:49" (1/1) ... [2021-11-25 19:34:49,415 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:34:49" (1/1) ... [2021-11-25 19:34:49,416 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:34:49" (1/1) ... [2021-11-25 19:34:49,451 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:34:49" (1/1) ... [2021-11-25 19:34:49,495 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:34:49" (1/1) ... [2021-11-25 19:34:49,500 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:34:49" (1/1) ... [2021-11-25 19:34:49,516 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:34:49,517 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:34:49,517 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:34:49,517 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:34:49,518 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:34:49" (1/1) ... [2021-11-25 19:34:49,533 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:34:49,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:34:49,554 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:34:49,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:34:49,608 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:34:49,609 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2021-11-25 19:34:49,609 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2021-11-25 19:34:49,609 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2021-11-25 19:34:49,609 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2021-11-25 19:34:49,609 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-25 19:34:49,609 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-25 19:34:49,610 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-25 19:34:49,610 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-25 19:34:49,610 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2021-11-25 19:34:49,610 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2021-11-25 19:34:49,610 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-25 19:34:49,610 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-25 19:34:49,610 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-25 19:34:49,610 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-25 19:34:49,611 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-25 19:34:49,611 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-25 19:34:49,611 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-25 19:34:49,611 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-25 19:34:49,611 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-25 19:34:49,611 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-25 19:34:49,611 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-25 19:34:49,611 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-25 19:34:49,612 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-25 19:34:49,612 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-25 19:34:49,612 INFO L130 BoogieDeclarations]: Found specification of procedure initTopDown [2021-11-25 19:34:49,612 INFO L138 BoogieDeclarations]: Found implementation of procedure initTopDown [2021-11-25 19:34:49,612 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-25 19:34:49,612 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-25 19:34:49,612 INFO L130 BoogieDeclarations]: Found specification of procedure initFloors [2021-11-25 19:34:49,613 INFO L138 BoogieDeclarations]: Found implementation of procedure initFloors [2021-11-25 19:34:49,613 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-25 19:34:49,613 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-25 19:34:49,613 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift__wrappee__empty [2021-11-25 19:34:49,613 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift__wrappee__empty [2021-11-25 19:34:49,613 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-25 19:34:49,614 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-25 19:34:49,614 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-25 19:34:49,614 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-25 19:34:49,614 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-25 19:34:49,614 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-25 19:34:49,614 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:34:49,614 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2021-11-25 19:34:49,615 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2021-11-25 19:34:49,615 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-25 19:34:49,615 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-25 19:34:49,616 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-25 19:34:49,616 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-25 19:34:49,617 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-25 19:34:49,617 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-25 19:34:49,618 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:34:49,618 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:34:49,618 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-25 19:34:49,618 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-25 19:34:49,821 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:34:49,823 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:34:51,065 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:34:51,626 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:34:51,626 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 19:34:51,631 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:34:51 BoogieIcfgContainer [2021-11-25 19:34:51,631 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:34:51,634 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:34:51,634 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:34:51,637 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:34:51,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:34:48" (1/3) ... [2021-11-25 19:34:51,638 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30982991 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:34:51, skipping insertion in model container [2021-11-25 19:34:51,639 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:34:49" (2/3) ... [2021-11-25 19:34:51,639 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30982991 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:34:51, skipping insertion in model container [2021-11-25 19:34:51,639 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:34:51" (3/3) ... [2021-11-25 19:34:51,640 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec3_product26.cil.c [2021-11-25 19:34:51,648 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:34:51,649 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:34:51,717 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:34:51,726 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 19:34:51,727 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:34:51,782 INFO L276 IsEmpty]: Start isEmpty. Operand has 390 states, 261 states have (on average 1.5900383141762453) internal successors, (415), 281 states have internal predecessors, (415), 102 states have call successors, (102), 25 states have call predecessors, (102), 25 states have return successors, (102), 98 states have call predecessors, (102), 102 states have call successors, (102) [2021-11-25 19:34:51,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 19:34:51,789 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:51,790 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 19:34:51,791 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:34:51,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:51,794 INFO L85 PathProgramCache]: Analyzing trace with hash -657220948, now seen corresponding path program 1 times [2021-11-25 19:34:51,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:34:51,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283245961] [2021-11-25 19:34:51,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:51,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:34:52,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:52,325 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:34:52,326 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:34:52,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283245961] [2021-11-25 19:34:52,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [283245961] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:34:52,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1661255011] [2021-11-25 19:34:52,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:52,328 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:34:52,328 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:34:52,330 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:34:52,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:34:52,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:52,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 1461 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:34:52,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:52,875 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:52,876 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:34:52,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1661255011] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:52,877 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:34:52,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2021-11-25 19:34:52,879 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662556751] [2021-11-25 19:34:52,880 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:52,885 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:34:52,886 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:34:52,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:34:52,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:34:52,925 INFO L87 Difference]: Start difference. First operand has 390 states, 261 states have (on average 1.5900383141762453) internal successors, (415), 281 states have internal predecessors, (415), 102 states have call successors, (102), 25 states have call predecessors, (102), 25 states have return successors, (102), 98 states have call predecessors, (102), 102 states have call successors, (102) Second operand has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-25 19:34:53,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:53,250 INFO L93 Difference]: Finished difference Result 1095 states and 1764 transitions. [2021-11-25 19:34:53,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:34:53,253 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 45 [2021-11-25 19:34:53,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:53,273 INFO L225 Difference]: With dead ends: 1095 [2021-11-25 19:34:53,274 INFO L226 Difference]: Without dead ends: 707 [2021-11-25 19:34:53,282 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:34:53,285 INFO L933 BasicCegarLoop]: 660 mSDtfsCounter, 587 mSDsluCounter, 524 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 587 SdHoareTripleChecker+Valid, 1151 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:53,286 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [587 Valid, 1151 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:34:53,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 707 states. [2021-11-25 19:34:53,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 707 to 695. [2021-11-25 19:34:53,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 695 states, 470 states have (on average 1.5829787234042554) internal successors, (744), 505 states have internal predecessors, (744), 180 states have call successors, (180), 45 states have call predecessors, (180), 44 states have return successors, (182), 172 states have call predecessors, (182), 177 states have call successors, (182) [2021-11-25 19:34:53,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 695 states to 695 states and 1106 transitions. [2021-11-25 19:34:53,448 INFO L78 Accepts]: Start accepts. Automaton has 695 states and 1106 transitions. Word has length 45 [2021-11-25 19:34:53,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:53,449 INFO L470 AbstractCegarLoop]: Abstraction has 695 states and 1106 transitions. [2021-11-25 19:34:53,450 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-25 19:34:53,450 INFO L276 IsEmpty]: Start isEmpty. Operand 695 states and 1106 transitions. [2021-11-25 19:34:53,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-25 19:34:53,459 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:53,459 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 19:34:53,495 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:53,675 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-25 19:34:53,676 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:34:53,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:53,676 INFO L85 PathProgramCache]: Analyzing trace with hash -1847079599, now seen corresponding path program 1 times [2021-11-25 19:34:53,677 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:34:53,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854808908] [2021-11-25 19:34:53,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:53,677 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:34:53,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:53,914 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:34:53,914 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:34:53,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854808908] [2021-11-25 19:34:53,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1854808908] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:53,919 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:34:53,919 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:34:53,920 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351062370] [2021-11-25 19:34:53,921 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:53,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:34:53,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:34:53,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:34:53,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:34:53,924 INFO L87 Difference]: Start difference. First operand 695 states and 1106 transitions. Second operand has 3 states, 3 states have (on average 9.0) internal successors, (27), 3 states have internal predecessors, (27), 3 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-25 19:34:54,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:54,262 INFO L93 Difference]: Finished difference Result 2057 states and 3312 transitions. [2021-11-25 19:34:54,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:34:54,263 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.0) internal successors, (27), 3 states have internal predecessors, (27), 3 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 46 [2021-11-25 19:34:54,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:54,281 INFO L225 Difference]: With dead ends: 2057 [2021-11-25 19:34:54,281 INFO L226 Difference]: Without dead ends: 1374 [2021-11-25 19:34:54,286 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:34:54,288 INFO L933 BasicCegarLoop]: 708 mSDtfsCounter, 576 mSDsluCounter, 589 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 576 SdHoareTripleChecker+Valid, 1265 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:54,289 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [576 Valid, 1265 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:34:54,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1374 states. [2021-11-25 19:34:54,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1374 to 1290. [2021-11-25 19:34:54,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1290 states, 903 states have (on average 1.6046511627906976) internal successors, (1449), 957 states have internal predecessors, (1449), 311 states have call successors, (311), 76 states have call predecessors, (311), 75 states have return successors, (330), 286 states have call predecessors, (330), 307 states have call successors, (330) [2021-11-25 19:34:54,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1290 states to 1290 states and 2090 transitions. [2021-11-25 19:34:54,408 INFO L78 Accepts]: Start accepts. Automaton has 1290 states and 2090 transitions. Word has length 46 [2021-11-25 19:34:54,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:54,408 INFO L470 AbstractCegarLoop]: Abstraction has 1290 states and 2090 transitions. [2021-11-25 19:34:54,409 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.0) internal successors, (27), 3 states have internal predecessors, (27), 3 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-25 19:34:54,409 INFO L276 IsEmpty]: Start isEmpty. Operand 1290 states and 2090 transitions. [2021-11-25 19:34:54,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 19:34:54,417 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:54,417 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 19:34:54,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 19:34:54,418 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:34:54,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:54,420 INFO L85 PathProgramCache]: Analyzing trace with hash -1529415749, now seen corresponding path program 1 times [2021-11-25 19:34:54,420 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:34:54,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [814084131] [2021-11-25 19:34:54,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:54,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:34:54,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:54,663 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:34:54,663 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:34:54,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [814084131] [2021-11-25 19:34:54,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [814084131] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:54,664 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:34:54,664 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:34:54,664 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159061598] [2021-11-25 19:34:54,664 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:54,665 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:34:54,665 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:34:54,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:34:54,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:34:54,666 INFO L87 Difference]: Start difference. First operand 1290 states and 2090 transitions. Second operand has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 3 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 4 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-25 19:34:55,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:55,473 INFO L93 Difference]: Finished difference Result 3320 states and 5551 transitions. [2021-11-25 19:34:55,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:34:55,474 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 3 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 4 states have call predecessors, (12), 3 states have call successors, (12) Word has length 70 [2021-11-25 19:34:55,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:55,500 INFO L225 Difference]: With dead ends: 3320 [2021-11-25 19:34:55,500 INFO L226 Difference]: Without dead ends: 2042 [2021-11-25 19:34:55,512 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:34:55,519 INFO L933 BasicCegarLoop]: 728 mSDtfsCounter, 644 mSDsluCounter, 2665 mSDsCounter, 0 mSdLazyCounter, 543 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 665 SdHoareTripleChecker+Valid, 3259 SdHoareTripleChecker+Invalid, 586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 543 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:55,520 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [665 Valid, 3259 Invalid, 586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 543 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 19:34:55,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2042 states. [2021-11-25 19:34:55,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2042 to 1882. [2021-11-25 19:34:55,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1882 states, 1323 states have (on average 1.600151171579743) internal successors, (2117), 1409 states have internal predecessors, (2117), 448 states have call successors, (448), 111 states have call predecessors, (448), 110 states have return successors, (512), 407 states have call predecessors, (512), 443 states have call successors, (512) [2021-11-25 19:34:55,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1882 states to 1882 states and 3077 transitions. [2021-11-25 19:34:55,682 INFO L78 Accepts]: Start accepts. Automaton has 1882 states and 3077 transitions. Word has length 70 [2021-11-25 19:34:55,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:55,685 INFO L470 AbstractCegarLoop]: Abstraction has 1882 states and 3077 transitions. [2021-11-25 19:34:55,685 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 3 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 4 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-25 19:34:55,685 INFO L276 IsEmpty]: Start isEmpty. Operand 1882 states and 3077 transitions. [2021-11-25 19:34:55,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 19:34:55,691 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:55,691 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 19:34:55,691 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 19:34:55,692 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:34:55,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:55,693 INFO L85 PathProgramCache]: Analyzing trace with hash -589147921, now seen corresponding path program 1 times [2021-11-25 19:34:55,693 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:34:55,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076560299] [2021-11-25 19:34:55,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:55,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:34:55,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:55,840 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:34:55,840 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:34:55,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076560299] [2021-11-25 19:34:55,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1076560299] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:34:55,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182672047] [2021-11-25 19:34:55,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:55,841 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:34:55,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:34:55,842 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:34:55,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:34:56,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:56,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 1738 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:34:56,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:56,317 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:56,317 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:34:56,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [182672047] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:56,317 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:34:56,317 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2021-11-25 19:34:56,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393327672] [2021-11-25 19:34:56,318 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:56,318 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:34:56,318 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:34:56,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:34:56,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:34:56,319 INFO L87 Difference]: Start difference. First operand 1882 states and 3077 transitions. Second operand has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 3 states have internal predecessors, (46), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 19:34:56,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:56,646 INFO L93 Difference]: Finished difference Result 4643 states and 7714 transitions. [2021-11-25 19:34:56,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:34:56,647 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 3 states have internal predecessors, (46), 3 states have call successors, (13), 3 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 70 [2021-11-25 19:34:56,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:56,673 INFO L225 Difference]: With dead ends: 4643 [2021-11-25 19:34:56,673 INFO L226 Difference]: Without dead ends: 2773 [2021-11-25 19:34:56,686 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:34:56,688 INFO L933 BasicCegarLoop]: 689 mSDtfsCounter, 553 mSDsluCounter, 516 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 553 SdHoareTripleChecker+Valid, 1174 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:56,690 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [553 Valid, 1174 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:34:56,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2773 states. [2021-11-25 19:34:56,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2773 to 2706. [2021-11-25 19:34:56,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2706 states, 1911 states have (on average 1.6033490319204604) internal successors, (3064), 2040 states have internal predecessors, (3064), 636 states have call successors, (636), 156 states have call predecessors, (636), 158 states have return successors, (741), 578 states have call predecessors, (741), 631 states have call successors, (741) [2021-11-25 19:34:56,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2706 states to 2706 states and 4441 transitions. [2021-11-25 19:34:56,862 INFO L78 Accepts]: Start accepts. Automaton has 2706 states and 4441 transitions. Word has length 70 [2021-11-25 19:34:56,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:56,863 INFO L470 AbstractCegarLoop]: Abstraction has 2706 states and 4441 transitions. [2021-11-25 19:34:56,863 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 3 states have internal predecessors, (46), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 19:34:56,863 INFO L276 IsEmpty]: Start isEmpty. Operand 2706 states and 4441 transitions. [2021-11-25 19:34:56,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 19:34:56,869 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:56,869 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 19:34:56,895 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:57,074 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:34:57,075 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:34:57,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:57,075 INFO L85 PathProgramCache]: Analyzing trace with hash -1440165068, now seen corresponding path program 1 times [2021-11-25 19:34:57,075 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:34:57,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1987070711] [2021-11-25 19:34:57,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:57,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:34:57,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:57,240 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:34:57,241 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:34:57,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1987070711] [2021-11-25 19:34:57,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1987070711] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:34:57,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1430084539] [2021-11-25 19:34:57,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:57,242 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:34:57,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:34:57,243 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:34:57,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:34:57,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:57,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 1750 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:34:57,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:57,770 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:57,770 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:34:57,770 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1430084539] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:57,770 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:34:57,770 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2021-11-25 19:34:57,770 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530893398] [2021-11-25 19:34:57,770 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:57,771 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:34:57,771 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:34:57,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:34:57,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:34:57,772 INFO L87 Difference]: Start difference. First operand 2706 states and 4441 transitions. Second operand has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 4 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-25 19:34:58,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:58,290 INFO L93 Difference]: Finished difference Result 7262 states and 12194 transitions. [2021-11-25 19:34:58,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:34:58,290 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 4 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 4 states have call successors, (12) Word has length 70 [2021-11-25 19:34:58,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:58,335 INFO L225 Difference]: With dead ends: 7262 [2021-11-25 19:34:58,336 INFO L226 Difference]: Without dead ends: 4568 [2021-11-25 19:34:58,363 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-11-25 19:34:58,364 INFO L933 BasicCegarLoop]: 678 mSDtfsCounter, 501 mSDsluCounter, 1213 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 506 SdHoareTripleChecker+Valid, 1826 SdHoareTripleChecker+Invalid, 331 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:58,364 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [506 Valid, 1826 Invalid, 331 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:34:58,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4568 states. [2021-11-25 19:34:58,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4568 to 4534. [2021-11-25 19:34:58,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4534 states, 3197 states have (on average 1.5386299655927431) internal successors, (4919), 3432 states have internal predecessors, (4919), 1061 states have call successors, (1061), 276 states have call predecessors, (1061), 275 states have return successors, (1341), 938 states have call predecessors, (1341), 1053 states have call successors, (1341) [2021-11-25 19:34:58,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4534 states to 4534 states and 7321 transitions. [2021-11-25 19:34:58,735 INFO L78 Accepts]: Start accepts. Automaton has 4534 states and 7321 transitions. Word has length 70 [2021-11-25 19:34:58,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:58,736 INFO L470 AbstractCegarLoop]: Abstraction has 4534 states and 7321 transitions. [2021-11-25 19:34:58,736 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 4 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-25 19:34:58,736 INFO L276 IsEmpty]: Start isEmpty. Operand 4534 states and 7321 transitions. [2021-11-25 19:34:58,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-25 19:34:58,740 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:58,740 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:34:58,779 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:58,959 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:34:58,959 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:34:58,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:58,960 INFO L85 PathProgramCache]: Analyzing trace with hash -420849600, now seen corresponding path program 1 times [2021-11-25 19:34:58,960 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:34:58,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427144314] [2021-11-25 19:34:58,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:58,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:34:59,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:59,104 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:34:59,105 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:34:59,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427144314] [2021-11-25 19:34:59,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [427144314] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:59,105 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:34:59,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 19:34:59,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494542002] [2021-11-25 19:34:59,106 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:59,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:34:59,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:34:59,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:34:59,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:34:59,107 INFO L87 Difference]: Start difference. First operand 4534 states and 7321 transitions. Second operand has 7 states, 6 states have (on average 8.166666666666666) internal successors, (49), 6 states have internal predecessors, (49), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 4 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-25 19:35:00,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:00,231 INFO L93 Difference]: Finished difference Result 12008 states and 20228 transitions. [2021-11-25 19:35:00,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 19:35:00,232 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 8.166666666666666) internal successors, (49), 6 states have internal predecessors, (49), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 4 states have call predecessors, (14), 3 states have call successors, (14) Word has length 80 [2021-11-25 19:35:00,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:00,306 INFO L225 Difference]: With dead ends: 12008 [2021-11-25 19:35:00,306 INFO L226 Difference]: Without dead ends: 7486 [2021-11-25 19:35:00,345 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-25 19:35:00,346 INFO L933 BasicCegarLoop]: 716 mSDtfsCounter, 620 mSDsluCounter, 3376 mSDsCounter, 0 mSdLazyCounter, 609 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 641 SdHoareTripleChecker+Valid, 3924 SdHoareTripleChecker+Invalid, 665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:00,349 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [641 Valid, 3924 Invalid, 665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 609 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 19:35:00,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7486 states. [2021-11-25 19:35:00,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7486 to 7161. [2021-11-25 19:35:00,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7161 states, 5082 states have (on average 1.5369933097205823) internal successors, (7811), 5483 states have internal predecessors, (7811), 1649 states have call successors, (1649), 427 states have call predecessors, (1649), 429 states have return successors, (2282), 1431 states have call predecessors, (2282), 1639 states have call successors, (2282) [2021-11-25 19:35:00,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7161 states to 7161 states and 11742 transitions. [2021-11-25 19:35:00,979 INFO L78 Accepts]: Start accepts. Automaton has 7161 states and 11742 transitions. Word has length 80 [2021-11-25 19:35:00,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:00,981 INFO L470 AbstractCegarLoop]: Abstraction has 7161 states and 11742 transitions. [2021-11-25 19:35:00,982 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 8.166666666666666) internal successors, (49), 6 states have internal predecessors, (49), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 4 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-25 19:35:00,982 INFO L276 IsEmpty]: Start isEmpty. Operand 7161 states and 11742 transitions. [2021-11-25 19:35:00,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-25 19:35:00,987 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:00,987 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-25 19:35:00,987 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 19:35:00,988 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:00,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:00,988 INFO L85 PathProgramCache]: Analyzing trace with hash -645969919, now seen corresponding path program 1 times [2021-11-25 19:35:00,989 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:00,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1628425752] [2021-11-25 19:35:00,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:00,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:01,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:01,131 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:35:01,131 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:01,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1628425752] [2021-11-25 19:35:01,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1628425752] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:01,132 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:01,132 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:35:01,133 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117547891] [2021-11-25 19:35:01,133 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:01,133 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:35:01,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:01,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:35:01,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:35:01,135 INFO L87 Difference]: Start difference. First operand 7161 states and 11742 transitions. Second operand has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 3 states have call successors, (17), 3 states have call predecessors, (17), 1 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-25 19:35:01,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:01,777 INFO L93 Difference]: Finished difference Result 15873 states and 26258 transitions. [2021-11-25 19:35:01,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:35:01,778 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 3 states have call successors, (17), 3 states have call predecessors, (17), 1 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 85 [2021-11-25 19:35:01,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:01,869 INFO L225 Difference]: With dead ends: 15873 [2021-11-25 19:35:01,869 INFO L226 Difference]: Without dead ends: 8724 [2021-11-25 19:35:01,915 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:35:01,916 INFO L933 BasicCegarLoop]: 676 mSDtfsCounter, 431 mSDsluCounter, 1084 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 433 SdHoareTripleChecker+Valid, 1700 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:01,916 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [433 Valid, 1700 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:35:01,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8724 states. [2021-11-25 19:35:02,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8724 to 8258. [2021-11-25 19:35:02,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8258 states, 5862 states have (on average 1.4993176390310474) internal successors, (8789), 6229 states have internal predecessors, (8789), 1833 states have call successors, (1833), 525 states have call predecessors, (1833), 562 states have return successors, (2628), 1672 states have call predecessors, (2628), 1818 states have call successors, (2628) [2021-11-25 19:35:02,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8258 states to 8258 states and 13250 transitions. [2021-11-25 19:35:02,577 INFO L78 Accepts]: Start accepts. Automaton has 8258 states and 13250 transitions. Word has length 85 [2021-11-25 19:35:02,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:02,577 INFO L470 AbstractCegarLoop]: Abstraction has 8258 states and 13250 transitions. [2021-11-25 19:35:02,577 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 3 states have call successors, (17), 3 states have call predecessors, (17), 1 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-25 19:35:02,578 INFO L276 IsEmpty]: Start isEmpty. Operand 8258 states and 13250 transitions. [2021-11-25 19:35:02,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-25 19:35:02,581 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:02,581 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-25 19:35:02,581 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 19:35:02,582 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:02,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:02,582 INFO L85 PathProgramCache]: Analyzing trace with hash 1750021359, now seen corresponding path program 1 times [2021-11-25 19:35:02,582 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:02,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375304911] [2021-11-25 19:35:02,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:02,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:02,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:02,746 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:35:02,746 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:02,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [375304911] [2021-11-25 19:35:02,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [375304911] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:02,747 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:02,747 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:35:02,747 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873807467] [2021-11-25 19:35:02,747 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:02,748 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:35:02,748 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:02,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:35:02,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:35:02,749 INFO L87 Difference]: Start difference. First operand 8258 states and 13250 transitions. Second operand has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-25 19:35:03,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:03,459 INFO L93 Difference]: Finished difference Result 16574 states and 27351 transitions. [2021-11-25 19:35:03,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:35:03,459 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) Word has length 86 [2021-11-25 19:35:03,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:03,531 INFO L225 Difference]: With dead ends: 16574 [2021-11-25 19:35:03,532 INFO L226 Difference]: Without dead ends: 9859 [2021-11-25 19:35:03,581 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:35:03,582 INFO L933 BasicCegarLoop]: 614 mSDtfsCounter, 117 mSDsluCounter, 1210 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 1752 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:03,582 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 1752 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:35:03,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9859 states. [2021-11-25 19:35:04,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9859 to 8304. [2021-11-25 19:35:04,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8304 states, 5908 states have (on average 1.4954299255247123) internal successors, (8835), 6275 states have internal predecessors, (8835), 1833 states have call successors, (1833), 525 states have call predecessors, (1833), 562 states have return successors, (2628), 1672 states have call predecessors, (2628), 1818 states have call successors, (2628) [2021-11-25 19:35:04,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8304 states to 8304 states and 13296 transitions. [2021-11-25 19:35:04,281 INFO L78 Accepts]: Start accepts. Automaton has 8304 states and 13296 transitions. Word has length 86 [2021-11-25 19:35:04,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:04,282 INFO L470 AbstractCegarLoop]: Abstraction has 8304 states and 13296 transitions. [2021-11-25 19:35:04,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-25 19:35:04,282 INFO L276 IsEmpty]: Start isEmpty. Operand 8304 states and 13296 transitions. [2021-11-25 19:35:04,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-25 19:35:04,286 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:04,286 INFO L514 BasicCegarLoop]: trace histogram [4, 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] [2021-11-25 19:35:04,286 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 19:35:04,287 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:04,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:04,287 INFO L85 PathProgramCache]: Analyzing trace with hash 239270762, now seen corresponding path program 1 times [2021-11-25 19:35:04,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:04,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1682272770] [2021-11-25 19:35:04,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:04,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:04,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:04,435 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 19:35:04,435 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:04,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1682272770] [2021-11-25 19:35:04,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1682272770] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:04,436 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:04,436 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-25 19:35:04,436 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004464509] [2021-11-25 19:35:04,436 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:04,437 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 19:35:04,437 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:04,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 19:35:04,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:35:04,438 INFO L87 Difference]: Start difference. First operand 8304 states and 13296 transitions. Second operand has 9 states, 9 states have (on average 5.777777777777778) internal successors, (52), 9 states have internal predecessors, (52), 7 states have call successors, (18), 4 states have call predecessors, (18), 4 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) [2021-11-25 19:35:07,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:07,422 INFO L93 Difference]: Finished difference Result 19942 states and 32306 transitions. [2021-11-25 19:35:07,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 19:35:07,423 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.777777777777778) internal successors, (52), 9 states have internal predecessors, (52), 7 states have call successors, (18), 4 states have call predecessors, (18), 4 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) Word has length 90 [2021-11-25 19:35:07,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:07,501 INFO L225 Difference]: With dead ends: 19942 [2021-11-25 19:35:07,501 INFO L226 Difference]: Without dead ends: 13205 [2021-11-25 19:35:07,545 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=76, Invalid=230, Unknown=0, NotChecked=0, Total=306 [2021-11-25 19:35:07,546 INFO L933 BasicCegarLoop]: 769 mSDtfsCounter, 1720 mSDsluCounter, 1994 mSDsCounter, 0 mSdLazyCounter, 2889 mSolverCounterSat, 701 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1805 SdHoareTripleChecker+Valid, 2627 SdHoareTripleChecker+Invalid, 3590 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 701 IncrementalHoareTripleChecker+Valid, 2889 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:07,546 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1805 Valid, 2627 Invalid, 3590 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [701 Valid, 2889 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-11-25 19:35:07,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13205 states. [2021-11-25 19:35:08,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13205 to 11810. [2021-11-25 19:35:08,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11810 states, 8640 states have (on average 1.494560185185185) internal successors, (12913), 9116 states have internal predecessors, (12913), 2364 states have call successors, (2364), 715 states have call predecessors, (2364), 805 states have return successors, (3523), 2138 states have call predecessors, (3523), 2349 states have call successors, (3523) [2021-11-25 19:35:08,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11810 states to 11810 states and 18800 transitions. [2021-11-25 19:35:08,425 INFO L78 Accepts]: Start accepts. Automaton has 11810 states and 18800 transitions. Word has length 90 [2021-11-25 19:35:08,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:08,426 INFO L470 AbstractCegarLoop]: Abstraction has 11810 states and 18800 transitions. [2021-11-25 19:35:08,427 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.777777777777778) internal successors, (52), 9 states have internal predecessors, (52), 7 states have call successors, (18), 4 states have call predecessors, (18), 4 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) [2021-11-25 19:35:08,427 INFO L276 IsEmpty]: Start isEmpty. Operand 11810 states and 18800 transitions. [2021-11-25 19:35:08,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-25 19:35:08,432 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:08,432 INFO L514 BasicCegarLoop]: trace histogram [4, 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] [2021-11-25 19:35:08,432 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 19:35:08,433 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:08,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:08,433 INFO L85 PathProgramCache]: Analyzing trace with hash -302873849, now seen corresponding path program 1 times [2021-11-25 19:35:08,433 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:08,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625934700] [2021-11-25 19:35:08,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:08,434 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:08,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:08,660 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 19:35:08,660 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:08,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625934700] [2021-11-25 19:35:08,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625934700] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:08,661 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:08,661 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-25 19:35:08,661 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095703087] [2021-11-25 19:35:08,661 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:08,662 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 19:35:08,662 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:08,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 19:35:08,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2021-11-25 19:35:08,663 INFO L87 Difference]: Start difference. First operand 11810 states and 18800 transitions. Second operand has 14 states, 13 states have (on average 4.230769230769231) internal successors, (55), 12 states have internal predecessors, (55), 7 states have call successors, (18), 5 states have call predecessors, (18), 6 states have return successors, (16), 7 states have call predecessors, (16), 6 states have call successors, (16) [2021-11-25 19:35:16,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:16,534 INFO L93 Difference]: Finished difference Result 49119 states and 86458 transitions. [2021-11-25 19:35:16,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-25 19:35:16,560 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 4.230769230769231) internal successors, (55), 12 states have internal predecessors, (55), 7 states have call successors, (18), 5 states have call predecessors, (18), 6 states have return successors, (16), 7 states have call predecessors, (16), 6 states have call successors, (16) Word has length 93 [2021-11-25 19:35:16,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:16,821 INFO L225 Difference]: With dead ends: 49119 [2021-11-25 19:35:16,822 INFO L226 Difference]: Without dead ends: 39596 [2021-11-25 19:35:16,913 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1001 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=535, Invalid=2887, Unknown=0, NotChecked=0, Total=3422 [2021-11-25 19:35:16,913 INFO L933 BasicCegarLoop]: 668 mSDtfsCounter, 3847 mSDsluCounter, 3489 mSDsCounter, 0 mSdLazyCounter, 7319 mSolverCounterSat, 2233 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3862 SdHoareTripleChecker+Valid, 3889 SdHoareTripleChecker+Invalid, 9552 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 2233 IncrementalHoareTripleChecker+Valid, 7319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:16,914 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3862 Valid, 3889 Invalid, 9552 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [2233 Valid, 7319 Invalid, 0 Unknown, 0 Unchecked, 5.7s Time] [2021-11-25 19:35:16,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39596 states. [2021-11-25 19:35:19,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39596 to 35996. [2021-11-25 19:35:19,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35996 states, 26721 states have (on average 1.511994311590135) internal successors, (40402), 27954 states have internal predecessors, (40402), 6652 states have call successors, (6652), 2260 states have call predecessors, (6652), 2622 states have return successors, (13418), 6145 states have call predecessors, (13418), 6617 states have call successors, (13418) [2021-11-25 19:35:20,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35996 states to 35996 states and 60472 transitions. [2021-11-25 19:35:20,138 INFO L78 Accepts]: Start accepts. Automaton has 35996 states and 60472 transitions. Word has length 93 [2021-11-25 19:35:20,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:20,138 INFO L470 AbstractCegarLoop]: Abstraction has 35996 states and 60472 transitions. [2021-11-25 19:35:20,139 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 4.230769230769231) internal successors, (55), 12 states have internal predecessors, (55), 7 states have call successors, (18), 5 states have call predecessors, (18), 6 states have return successors, (16), 7 states have call predecessors, (16), 6 states have call successors, (16) [2021-11-25 19:35:20,139 INFO L276 IsEmpty]: Start isEmpty. Operand 35996 states and 60472 transitions. [2021-11-25 19:35:20,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-25 19:35:20,151 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:20,151 INFO L514 BasicCegarLoop]: trace histogram [4, 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] [2021-11-25 19:35:20,152 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 19:35:20,152 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:20,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:20,153 INFO L85 PathProgramCache]: Analyzing trace with hash -39757255, now seen corresponding path program 1 times [2021-11-25 19:35:20,153 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:20,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1410702233] [2021-11-25 19:35:20,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:20,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:20,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:20,294 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 19:35:20,295 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:20,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1410702233] [2021-11-25 19:35:20,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1410702233] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:20,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1972512872] [2021-11-25 19:35:20,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:20,296 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:20,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:35:20,300 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:35:20,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:35:20,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:20,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 1895 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 19:35:20,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:21,001 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 19:35:21,001 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:35:21,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1972512872] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:21,001 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:35:21,001 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-25 19:35:21,002 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643890013] [2021-11-25 19:35:21,002 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:21,002 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:35:21,003 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:21,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:35:21,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:35:21,004 INFO L87 Difference]: Start difference. First operand 35996 states and 60472 transitions. Second operand has 5 states, 5 states have (on average 13.4) internal successors, (67), 4 states have internal predecessors, (67), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (21), 3 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-25 19:35:22,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:22,970 INFO L93 Difference]: Finished difference Result 71695 states and 125848 transitions. [2021-11-25 19:35:22,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:35:22,970 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.4) internal successors, (67), 4 states have internal predecessors, (67), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (21), 3 states have call predecessors, (21), 2 states have call successors, (21) Word has length 117 [2021-11-25 19:35:22,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:23,223 INFO L225 Difference]: With dead ends: 71695 [2021-11-25 19:35:23,223 INFO L226 Difference]: Without dead ends: 37286 [2021-11-25 19:35:23,724 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:35:23,725 INFO L933 BasicCegarLoop]: 572 mSDtfsCounter, 2 mSDsluCounter, 1801 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 2264 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:23,725 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 2264 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:35:23,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37286 states. [2021-11-25 19:35:25,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37286 to 36700. [2021-11-25 19:35:25,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36700 states, 27182 states have (on average 1.5033110146420425) internal successors, (40863), 28512 states have internal predecessors, (40863), 6694 states have call successors, (6694), 2260 states have call predecessors, (6694), 2823 states have return successors, (14761), 6291 states have call predecessors, (14761), 6659 states have call successors, (14761) [2021-11-25 19:35:26,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36700 states to 36700 states and 62318 transitions. [2021-11-25 19:35:26,334 INFO L78 Accepts]: Start accepts. Automaton has 36700 states and 62318 transitions. Word has length 117 [2021-11-25 19:35:26,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:26,335 INFO L470 AbstractCegarLoop]: Abstraction has 36700 states and 62318 transitions. [2021-11-25 19:35:26,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.4) internal successors, (67), 4 states have internal predecessors, (67), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (21), 3 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-25 19:35:26,335 INFO L276 IsEmpty]: Start isEmpty. Operand 36700 states and 62318 transitions. [2021-11-25 19:35:26,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-25 19:35:26,352 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:26,352 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:26,391 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:35:26,579 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 19:35:26,580 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:26,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:26,580 INFO L85 PathProgramCache]: Analyzing trace with hash 1485798486, now seen corresponding path program 1 times [2021-11-25 19:35:26,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:26,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416372743] [2021-11-25 19:35:26,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:26,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:26,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:26,696 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 19:35:26,696 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:26,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416372743] [2021-11-25 19:35:26,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [416372743] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:26,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2050888382] [2021-11-25 19:35:26,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:26,697 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:26,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:35:26,698 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:35:26,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 19:35:27,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:27,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 1901 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:35:27,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:27,257 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 19:35:27,257 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:35:27,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2050888382] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:27,257 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:35:27,257 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2021-11-25 19:35:27,257 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546096879] [2021-11-25 19:35:27,258 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:27,258 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:35:27,258 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:27,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:35:27,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:35:27,259 INFO L87 Difference]: Start difference. First operand 36700 states and 62318 transitions. Second operand has 4 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 2 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) [2021-11-25 19:35:29,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:29,649 INFO L93 Difference]: Finished difference Result 80607 states and 142268 transitions. [2021-11-25 19:35:29,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:35:29,649 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 2 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) Word has length 128 [2021-11-25 19:35:29,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:29,908 INFO L225 Difference]: With dead ends: 80607 [2021-11-25 19:35:29,908 INFO L226 Difference]: Without dead ends: 34684 [2021-11-25 19:35:30,352 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:35:30,353 INFO L933 BasicCegarLoop]: 611 mSDtfsCounter, 241 mSDsluCounter, 1044 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 252 SdHoareTripleChecker+Valid, 1585 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:30,353 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [252 Valid, 1585 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:35:30,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34684 states. [2021-11-25 19:35:32,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34684 to 34527. [2021-11-25 19:35:32,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34527 states, 25382 states have (on average 1.4553226696083839) internal successors, (36939), 26687 states have internal predecessors, (36939), 6405 states have call successors, (6405), 2222 states have call predecessors, (6405), 2739 states have return successors, (13414), 5981 states have call predecessors, (13414), 6375 states have call successors, (13414) [2021-11-25 19:35:32,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34527 states to 34527 states and 56758 transitions. [2021-11-25 19:35:32,547 INFO L78 Accepts]: Start accepts. Automaton has 34527 states and 56758 transitions. Word has length 128 [2021-11-25 19:35:32,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:32,548 INFO L470 AbstractCegarLoop]: Abstraction has 34527 states and 56758 transitions. [2021-11-25 19:35:32,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 2 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) [2021-11-25 19:35:32,549 INFO L276 IsEmpty]: Start isEmpty. Operand 34527 states and 56758 transitions. [2021-11-25 19:35:32,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-25 19:35:32,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:32,564 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 19:35:32,604 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 19:35:32,779 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 19:35:32,779 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:32,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:32,780 INFO L85 PathProgramCache]: Analyzing trace with hash -1739786144, now seen corresponding path program 1 times [2021-11-25 19:35:32,780 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:32,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2025439567] [2021-11-25 19:35:32,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:32,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:32,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:32,920 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-25 19:35:32,920 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:32,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2025439567] [2021-11-25 19:35:32,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2025439567] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:32,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2119019578] [2021-11-25 19:35:32,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:32,921 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:32,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:35:32,924 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:35:32,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:35:33,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:33,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 2321 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:35:33,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:33,727 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:35:33,727 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:35:33,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2119019578] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:33,728 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:35:33,728 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [10] total 16 [2021-11-25 19:35:33,728 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058157732] [2021-11-25 19:35:33,728 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:33,729 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 19:35:33,729 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:33,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 19:35:33,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2021-11-25 19:35:33,730 INFO L87 Difference]: Start difference. First operand 34527 states and 56758 transitions. Second operand has 8 states, 7 states have (on average 11.857142857142858) internal successors, (83), 7 states have internal predecessors, (83), 5 states have call successors, (23), 4 states have call predecessors, (23), 5 states have return successors, (21), 5 states have call predecessors, (21), 5 states have call successors, (21) [2021-11-25 19:35:37,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:37,891 INFO L93 Difference]: Finished difference Result 73589 states and 124311 transitions. [2021-11-25 19:35:37,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 19:35:37,892 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 11.857142857142858) internal successors, (83), 7 states have internal predecessors, (83), 5 states have call successors, (23), 4 states have call predecessors, (23), 5 states have return successors, (21), 5 states have call predecessors, (21), 5 states have call successors, (21) Word has length 130 [2021-11-25 19:35:37,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:38,269 INFO L225 Difference]: With dead ends: 73589 [2021-11-25 19:35:38,270 INFO L226 Difference]: Without dead ends: 39018 [2021-11-25 19:35:38,703 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=107, Invalid=595, Unknown=0, NotChecked=0, Total=702 [2021-11-25 19:35:38,704 INFO L933 BasicCegarLoop]: 594 mSDtfsCounter, 1152 mSDsluCounter, 1305 mSDsCounter, 0 mSdLazyCounter, 3025 mSolverCounterSat, 493 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1235 SdHoareTripleChecker+Valid, 1772 SdHoareTripleChecker+Invalid, 3518 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 493 IncrementalHoareTripleChecker+Valid, 3025 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:38,704 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1235 Valid, 1772 Invalid, 3518 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [493 Valid, 3025 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-11-25 19:35:38,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39018 states. [2021-11-25 19:35:40,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39018 to 34507. [2021-11-25 19:35:40,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34507 states, 25362 states have (on average 1.455524012301869) internal successors, (36915), 26667 states have internal predecessors, (36915), 6405 states have call successors, (6405), 2222 states have call predecessors, (6405), 2739 states have return successors, (13414), 5981 states have call predecessors, (13414), 6375 states have call successors, (13414) [2021-11-25 19:35:40,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34507 states to 34507 states and 56734 transitions. [2021-11-25 19:35:40,739 INFO L78 Accepts]: Start accepts. Automaton has 34507 states and 56734 transitions. Word has length 130 [2021-11-25 19:35:40,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:40,739 INFO L470 AbstractCegarLoop]: Abstraction has 34507 states and 56734 transitions. [2021-11-25 19:35:40,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 11.857142857142858) internal successors, (83), 7 states have internal predecessors, (83), 5 states have call successors, (23), 4 states have call predecessors, (23), 5 states have return successors, (21), 5 states have call predecessors, (21), 5 states have call successors, (21) [2021-11-25 19:35:40,740 INFO L276 IsEmpty]: Start isEmpty. Operand 34507 states and 56734 transitions. [2021-11-25 19:35:40,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-25 19:35:40,752 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:40,752 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:40,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 19:35:40,979 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:40,979 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:40,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:40,980 INFO L85 PathProgramCache]: Analyzing trace with hash 1210057798, now seen corresponding path program 1 times [2021-11-25 19:35:40,980 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:40,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467861069] [2021-11-25 19:35:40,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:40,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:41,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:41,099 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 19:35:41,099 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:41,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467861069] [2021-11-25 19:35:41,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1467861069] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:41,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1744315118] [2021-11-25 19:35:41,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:41,100 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:41,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:35:41,101 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:35:41,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:35:41,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:41,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 1905 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:35:41,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:41,662 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 19:35:41,662 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:35:41,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1744315118] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:41,663 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:35:41,663 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2021-11-25 19:35:41,663 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597883711] [2021-11-25 19:35:41,663 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:41,664 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:35:41,664 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:41,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:35:41,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:35:41,665 INFO L87 Difference]: Start difference. First operand 34507 states and 56734 transitions. Second operand has 4 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 2 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) [2021-11-25 19:35:44,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:44,268 INFO L93 Difference]: Finished difference Result 77425 states and 132062 transitions. [2021-11-25 19:35:44,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:35:44,268 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 2 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) Word has length 132 [2021-11-25 19:35:44,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:44,478 INFO L225 Difference]: With dead ends: 77425 [2021-11-25 19:35:44,478 INFO L226 Difference]: Without dead ends: 34507 [2021-11-25 19:35:44,723 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:35:44,724 INFO L933 BasicCegarLoop]: 594 mSDtfsCounter, 239 mSDsluCounter, 1034 mSDsCounter, 0 mSdLazyCounter, 170 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 250 SdHoareTripleChecker+Valid, 1556 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:44,725 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [250 Valid, 1556 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 170 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:35:44,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34507 states. [2021-11-25 19:35:46,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34507 to 34507. [2021-11-25 19:35:46,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34507 states, 25362 states have (on average 1.4019793391688353) internal successors, (35557), 26667 states have internal predecessors, (35557), 6405 states have call successors, (6405), 2222 states have call predecessors, (6405), 2739 states have return successors, (13414), 5981 states have call predecessors, (13414), 6375 states have call successors, (13414) [2021-11-25 19:35:46,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34507 states to 34507 states and 55376 transitions. [2021-11-25 19:35:46,674 INFO L78 Accepts]: Start accepts. Automaton has 34507 states and 55376 transitions. Word has length 132 [2021-11-25 19:35:46,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:46,675 INFO L470 AbstractCegarLoop]: Abstraction has 34507 states and 55376 transitions. [2021-11-25 19:35:46,675 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 2 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) [2021-11-25 19:35:46,676 INFO L276 IsEmpty]: Start isEmpty. Operand 34507 states and 55376 transitions. [2021-11-25 19:35:46,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 19:35:46,706 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:46,707 INFO L514 BasicCegarLoop]: trace histogram [6, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 19:35:46,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:35:46,931 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 19:35:46,932 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:46,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:46,932 INFO L85 PathProgramCache]: Analyzing trace with hash -124985677, now seen corresponding path program 1 times [2021-11-25 19:35:46,932 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:46,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1632829412] [2021-11-25 19:35:46,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:46,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:46,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:47,041 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-25 19:35:47,042 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:47,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1632829412] [2021-11-25 19:35:47,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1632829412] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:47,042 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:47,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:35:47,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905659307] [2021-11-25 19:35:47,043 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:47,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:35:47,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:47,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:35:47,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:35:47,045 INFO L87 Difference]: Start difference. First operand 34507 states and 55376 transitions. Second operand has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 3 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) [2021-11-25 19:35:49,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:49,884 INFO L93 Difference]: Finished difference Result 80451 states and 133809 transitions. [2021-11-25 19:35:49,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:35:49,884 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 3 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) Word has length 143 [2021-11-25 19:35:49,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:50,159 INFO L225 Difference]: With dead ends: 80451 [2021-11-25 19:35:50,159 INFO L226 Difference]: Without dead ends: 45956 [2021-11-25 19:35:50,393 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:35:50,394 INFO L933 BasicCegarLoop]: 782 mSDtfsCounter, 495 mSDsluCounter, 571 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 495 SdHoareTripleChecker+Valid, 1320 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:50,394 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [495 Valid, 1320 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:35:50,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45956 states. [2021-11-25 19:35:52,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45956 to 45349. [2021-11-25 19:35:52,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45349 states, 33393 states have (on average 1.4001736890965173) internal successors, (46756), 35156 states have internal predecessors, (46756), 8342 states have call successors, (8342), 2893 states have call predecessors, (8342), 3613 states have return successors, (17829), 7793 states have call predecessors, (17829), 8312 states have call successors, (17829) [2021-11-25 19:35:53,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45349 states to 45349 states and 72927 transitions. [2021-11-25 19:35:53,430 INFO L78 Accepts]: Start accepts. Automaton has 45349 states and 72927 transitions. Word has length 143 [2021-11-25 19:35:53,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:53,431 INFO L470 AbstractCegarLoop]: Abstraction has 45349 states and 72927 transitions. [2021-11-25 19:35:53,431 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 3 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) [2021-11-25 19:35:53,431 INFO L276 IsEmpty]: Start isEmpty. Operand 45349 states and 72927 transitions. [2021-11-25 19:35:53,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-25 19:35:53,450 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:53,451 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 19:35:53,451 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-25 19:35:53,451 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:53,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:53,452 INFO L85 PathProgramCache]: Analyzing trace with hash 1308856575, now seen corresponding path program 1 times [2021-11-25 19:35:53,452 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:53,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1987442554] [2021-11-25 19:35:53,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:53,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:53,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:53,765 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 12 proven. 17 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2021-11-25 19:35:53,765 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:53,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1987442554] [2021-11-25 19:35:53,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1987442554] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:53,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396798437] [2021-11-25 19:35:53,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:53,766 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:53,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:35:53,772 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:35:53,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ad500-fc1b-403a-a133-ad13a6daf659/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 19:35:54,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:54,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 2379 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:35:54,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:54,528 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 40 proven. 2 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-25 19:35:54,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:35:55,003 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-25 19:35:55,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1396798437] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:55,003 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:35:55,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [18, 7] total 25 [2021-11-25 19:35:55,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185168240] [2021-11-25 19:35:55,004 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:55,005 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:35:55,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:55,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:35:55,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=527, Unknown=0, NotChecked=0, Total=600 [2021-11-25 19:35:55,006 INFO L87 Difference]: Start difference. First operand 45349 states and 72927 transitions. Second operand has 7 states, 7 states have (on average 11.571428571428571) internal successors, (81), 7 states have internal predecessors, (81), 6 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (25), 6 states have call predecessors, (25), 6 states have call successors, (25)