./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec3_product01.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_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/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_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec3_product01.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/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_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/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 2e63e44256bba8522bf99795cd1238c2e8ad8456659e8a545df838f8f88bd318 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:18:57,126 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:18:57,131 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:18:57,179 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:18:57,180 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:18:57,182 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:18:57,184 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:18:57,187 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:18:57,190 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:18:57,191 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:18:57,193 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:18:57,195 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:18:57,196 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:18:57,197 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:18:57,200 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:18:57,202 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:18:57,204 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:18:57,205 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:18:57,209 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:18:57,213 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:18:57,216 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:18:57,218 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:18:57,220 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:18:57,221 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:18:57,226 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:18:57,227 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:18:57,227 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:18:57,229 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:18:57,230 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:18:57,231 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:18:57,232 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:18:57,233 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:18:57,234 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:18:57,235 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:18:57,237 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:18:57,238 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:18:57,239 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:18:57,240 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:18:57,240 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:18:57,242 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:18:57,243 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:18:57,244 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:18:57,279 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:18:57,279 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:18:57,280 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:18:57,280 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:18:57,281 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:18:57,281 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:18:57,282 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:18:57,282 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:18:57,282 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:18:57,283 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:18:57,283 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:18:57,284 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:18:57,284 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:18:57,284 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:18:57,285 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:18:57,285 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:18:57,286 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:18:57,286 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:18:57,287 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:18:57,287 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:18:57,288 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:18:57,288 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:18:57,288 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:18:57,289 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:18:57,289 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:18:57,289 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:18:57,290 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:18:57,290 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:18:57,291 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:18:57,291 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:18:57,291 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:18:57,292 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:18:57,292 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:18:57,293 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:18:57,293 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:18:57,293 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:18:57,294 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:18:57,294 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:18:57,294 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:18:57,294 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:18:57,295 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:18:57,295 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_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2e63e44256bba8522bf99795cd1238c2e8ad8456659e8a545df838f8f88bd318 [2021-11-25 18:18:57,616 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:18:57,642 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:18:57,645 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:18:57,647 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:18:57,648 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:18:57,650 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/product-lines/elevator_spec3_product01.cil.c [2021-11-25 18:18:57,735 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/data/f4016b39d/6e553ef6be97493cb8af68da8b00bda5/FLAG4fd2574a3 [2021-11-25 18:18:58,525 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:18:58,526 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/sv-benchmarks/c/product-lines/elevator_spec3_product01.cil.c [2021-11-25 18:18:58,558 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/data/f4016b39d/6e553ef6be97493cb8af68da8b00bda5/FLAG4fd2574a3 [2021-11-25 18:18:58,632 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/data/f4016b39d/6e553ef6be97493cb8af68da8b00bda5 [2021-11-25 18:18:58,635 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:18:58,637 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:18:58,654 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:18:58,654 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:18:58,658 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:18:58,659 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:18:58" (1/1) ... [2021-11-25 18:18:58,661 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55be319d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:18:58, skipping insertion in model container [2021-11-25 18:18:58,661 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:18:58" (1/1) ... [2021-11-25 18:18:58,680 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:18:58,784 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:18:59,402 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_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/sv-benchmarks/c/product-lines/elevator_spec3_product01.cil.c[40412,40425] [2021-11-25 18:18:59,539 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:18:59,567 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:18:59,706 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_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/sv-benchmarks/c/product-lines/elevator_spec3_product01.cil.c[40412,40425] [2021-11-25 18:18:59,786 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:18:59,824 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:18:59,825 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:18:59 WrapperNode [2021-11-25 18:18:59,825 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:18:59,826 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:18:59,826 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:18:59,826 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:18:59,837 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:18:59" (1/1) ... [2021-11-25 18:18:59,876 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:18:59" (1/1) ... [2021-11-25 18:18:59,964 INFO L137 Inliner]: procedures = 86, calls = 334, calls flagged for inlining = 21, calls inlined = 18, statements flattened = 750 [2021-11-25 18:18:59,977 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:18:59,978 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:18:59,978 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:18:59,978 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:18:59,989 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:18:59" (1/1) ... [2021-11-25 18:18:59,990 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:18:59" (1/1) ... [2021-11-25 18:18:59,998 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:18:59" (1/1) ... [2021-11-25 18:18:59,999 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:18:59" (1/1) ... [2021-11-25 18:19:00,045 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:18:59" (1/1) ... [2021-11-25 18:19:00,084 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:18:59" (1/1) ... [2021-11-25 18:19:00,090 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:18:59" (1/1) ... [2021-11-25 18:19:00,109 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:19:00,113 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:19:00,114 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:19:00,114 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:19:00,118 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:18:59" (1/1) ... [2021-11-25 18:19:00,133 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:19:00,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:19:00,171 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:19:00,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:19:00,237 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:19:00,238 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2021-11-25 18:19:00,238 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2021-11-25 18:19:00,238 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-25 18:19:00,238 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-25 18:19:00,239 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-25 18:19:00,239 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-25 18:19:00,239 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2021-11-25 18:19:00,239 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2021-11-25 18:19:00,240 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-25 18:19:00,240 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-25 18:19:00,240 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-25 18:19:00,240 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-25 18:19:00,244 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-25 18:19:00,245 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-25 18:19:00,245 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-25 18:19:00,245 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-25 18:19:00,246 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-25 18:19:00,246 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-25 18:19:00,246 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-25 18:19:00,246 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-25 18:19:00,246 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-25 18:19:00,247 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-25 18:19:00,247 INFO L130 BoogieDeclarations]: Found specification of procedure initTopDown [2021-11-25 18:19:00,247 INFO L138 BoogieDeclarations]: Found implementation of procedure initTopDown [2021-11-25 18:19:00,247 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-25 18:19:00,248 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-25 18:19:00,248 INFO L130 BoogieDeclarations]: Found specification of procedure initFloors [2021-11-25 18:19:00,248 INFO L138 BoogieDeclarations]: Found implementation of procedure initFloors [2021-11-25 18:19:00,248 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-25 18:19:00,248 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-25 18:19:00,249 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-25 18:19:00,249 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-25 18:19:00,249 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-25 18:19:00,249 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-25 18:19:00,250 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-25 18:19:00,250 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-25 18:19:00,250 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:19:00,250 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2021-11-25 18:19:00,250 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2021-11-25 18:19:00,251 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-25 18:19:00,251 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-25 18:19:00,251 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-25 18:19:00,252 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-25 18:19:00,252 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-25 18:19:00,252 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-25 18:19:00,253 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:19:00,254 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:19:00,255 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-25 18:19:00,255 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-25 18:19:00,517 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:19:00,531 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:19:01,935 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:19:02,720 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:19:02,720 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 18:19:02,726 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:19:02 BoogieIcfgContainer [2021-11-25 18:19:02,727 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:19:02,730 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:19:02,730 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:19:02,734 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:19:02,735 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:18:58" (1/3) ... [2021-11-25 18:19:02,736 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@626fe57d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:19:02, skipping insertion in model container [2021-11-25 18:19:02,737 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:18:59" (2/3) ... [2021-11-25 18:19:02,737 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@626fe57d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:19:02, skipping insertion in model container [2021-11-25 18:19:02,737 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:19:02" (3/3) ... [2021-11-25 18:19:02,739 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec3_product01.cil.c [2021-11-25 18:19:02,750 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:19:02,750 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:19:02,832 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:19:02,843 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 18:19:02,844 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:19:02,906 INFO L276 IsEmpty]: Start isEmpty. Operand has 377 states, 254 states have (on average 1.5984251968503937) internal successors, (406), 272 states have internal predecessors, (406), 98 states have call successors, (98), 23 states have call predecessors, (98), 23 states have return successors, (98), 95 states have call predecessors, (98), 98 states have call successors, (98) [2021-11-25 18:19:02,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 18:19:02,944 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:19:02,945 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] [2021-11-25 18:19:02,946 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:19:02,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:19:02,954 INFO L85 PathProgramCache]: Analyzing trace with hash 1523319636, now seen corresponding path program 1 times [2021-11-25 18:19:02,966 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:19:02,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [987017890] [2021-11-25 18:19:02,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:02,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:19:03,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:03,647 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 18:19:03,648 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:19:03,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [987017890] [2021-11-25 18:19:03,649 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [987017890] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:19:03,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1261784735] [2021-11-25 18:19:03,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:03,651 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:03,651 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:19:03,653 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:19:03,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:19:04,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:04,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 1504 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:19:04,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:19:04,404 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 18:19:04,404 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:19:04,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1261784735] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:19:04,405 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:19:04,405 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 18:19:04,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811110871] [2021-11-25 18:19:04,409 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:19:04,414 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:19:04,414 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:19:04,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:19:04,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:19:04,457 INFO L87 Difference]: Start difference. First operand has 377 states, 254 states have (on average 1.5984251968503937) internal successors, (406), 272 states have internal predecessors, (406), 98 states have call successors, (98), 23 states have call predecessors, (98), 23 states have return successors, (98), 95 states have call predecessors, (98), 98 states have call successors, (98) Second operand has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:19:04,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:19:04,849 INFO L93 Difference]: Finished difference Result 1056 states and 1713 transitions. [2021-11-25 18:19:04,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:19:04,852 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 63 [2021-11-25 18:19:04,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:19:04,889 INFO L225 Difference]: With dead ends: 1056 [2021-11-25 18:19:04,890 INFO L226 Difference]: Without dead ends: 681 [2021-11-25 18:19:04,905 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:19:04,917 INFO L933 BasicCegarLoop]: 643 mSDtfsCounter, 552 mSDsluCounter, 507 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 552 SdHoareTripleChecker+Valid, 1121 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:19:04,921 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [552 Valid, 1121 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:19:04,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 681 states. [2021-11-25 18:19:05,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 681 to 669. [2021-11-25 18:19:05,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 669 states, 456 states have (on average 1.5921052631578947) internal successors, (726), 487 states have internal predecessors, (726), 172 states have call successors, (172), 41 states have call predecessors, (172), 40 states have return successors, (174), 166 states have call predecessors, (174), 169 states have call successors, (174) [2021-11-25 18:19:05,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 669 states to 669 states and 1072 transitions. [2021-11-25 18:19:05,167 INFO L78 Accepts]: Start accepts. Automaton has 669 states and 1072 transitions. Word has length 63 [2021-11-25 18:19:05,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:19:05,168 INFO L470 AbstractCegarLoop]: Abstraction has 669 states and 1072 transitions. [2021-11-25 18:19:05,170 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:19:05,170 INFO L276 IsEmpty]: Start isEmpty. Operand 669 states and 1072 transitions. [2021-11-25 18:19:05,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-25 18:19:05,186 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:19:05,186 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] [2021-11-25 18:19:05,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:19:05,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-25 18:19:05,397 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:19:05,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:19:05,399 INFO L85 PathProgramCache]: Analyzing trace with hash -594469980, now seen corresponding path program 1 times [2021-11-25 18:19:05,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:19:05,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [424258111] [2021-11-25 18:19:05,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:05,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:19:05,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:05,701 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 18:19:05,702 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:19:05,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [424258111] [2021-11-25 18:19:05,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [424258111] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:19:05,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [200619447] [2021-11-25 18:19:05,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:05,709 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:05,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:19:05,721 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:19:05,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:19:06,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:06,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 1515 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 18:19:06,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:19:06,353 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 18:19:06,353 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:19:06,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [200619447] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:19:06,354 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:19:06,354 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2021-11-25 18:19:06,354 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98842284] [2021-11-25 18:19:06,354 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:19:06,355 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:19:06,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:19:06,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:19:06,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:19:06,357 INFO L87 Difference]: Start difference. First operand 669 states and 1072 transitions. Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:19:06,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:19:06,714 INFO L93 Difference]: Finished difference Result 1905 states and 3088 transitions. [2021-11-25 18:19:06,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:19:06,715 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 3 states have call successors, (11) Word has length 64 [2021-11-25 18:19:06,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:19:06,729 INFO L225 Difference]: With dead ends: 1905 [2021-11-25 18:19:06,729 INFO L226 Difference]: Without dead ends: 1248 [2021-11-25 18:19:06,737 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:19:06,739 INFO L933 BasicCegarLoop]: 670 mSDtfsCounter, 474 mSDsluCounter, 511 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 474 SdHoareTripleChecker+Valid, 1156 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:19:06,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [474 Valid, 1156 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:19:06,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1248 states. [2021-11-25 18:19:06,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1248 to 1228. [2021-11-25 18:19:06,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1228 states, 833 states have (on average 1.547418967587035) internal successors, (1289), 893 states have internal predecessors, (1289), 321 states have call successors, (321), 76 states have call predecessors, (321), 73 states have return successors, (340), 308 states have call predecessors, (340), 317 states have call successors, (340) [2021-11-25 18:19:06,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1228 states to 1228 states and 1950 transitions. [2021-11-25 18:19:06,869 INFO L78 Accepts]: Start accepts. Automaton has 1228 states and 1950 transitions. Word has length 64 [2021-11-25 18:19:06,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:19:06,870 INFO L470 AbstractCegarLoop]: Abstraction has 1228 states and 1950 transitions. [2021-11-25 18:19:06,873 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:19:06,873 INFO L276 IsEmpty]: Start isEmpty. Operand 1228 states and 1950 transitions. [2021-11-25 18:19:06,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-25 18:19:06,883 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:19:06,883 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] [2021-11-25 18:19:06,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:19:07,093 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:07,093 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:19:07,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:19:07,094 INFO L85 PathProgramCache]: Analyzing trace with hash 1764450137, now seen corresponding path program 1 times [2021-11-25 18:19:07,094 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:19:07,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949818634] [2021-11-25 18:19:07,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:07,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:19:07,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:07,281 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 18:19:07,281 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:19:07,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949818634] [2021-11-25 18:19:07,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1949818634] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:19:07,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1693374775] [2021-11-25 18:19:07,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:07,282 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:07,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:19:07,283 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:19:07,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:19:07,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:07,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 1531 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 18:19:07,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:19:07,833 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 18:19:07,834 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:19:07,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1693374775] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:19:07,834 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:19:07,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2021-11-25 18:19:07,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381551815] [2021-11-25 18:19:07,835 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:19:07,836 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:19:07,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:19:07,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:19:07,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-11-25 18:19:07,838 INFO L87 Difference]: Start difference. First operand 1228 states and 1950 transitions. Second operand has 4 states, 4 states have (on average 10.5) internal successors, (42), 4 states have internal predecessors, (42), 2 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-25 18:19:08,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:19:08,252 INFO L93 Difference]: Finished difference Result 2375 states and 3847 transitions. [2021-11-25 18:19:08,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:19:08,253 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 4 states have internal predecessors, (42), 2 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 68 [2021-11-25 18:19:08,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:19:08,270 INFO L225 Difference]: With dead ends: 2375 [2021-11-25 18:19:08,270 INFO L226 Difference]: Without dead ends: 1594 [2021-11-25 18:19:08,278 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:19:08,280 INFO L933 BasicCegarLoop]: 620 mSDtfsCounter, 139 mSDsluCounter, 1190 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 1747 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:19:08,280 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 1747 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:19:08,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1594 states. [2021-11-25 18:19:08,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1594 to 1414. [2021-11-25 18:19:08,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1414 states, 929 states have (on average 1.534983853606028) internal successors, (1426), 1015 states have internal predecessors, (1426), 409 states have call successors, (409), 76 states have call predecessors, (409), 75 states have return successors, (436), 396 states have call predecessors, (436), 405 states have call successors, (436) [2021-11-25 18:19:08,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1414 states to 1414 states and 2271 transitions. [2021-11-25 18:19:08,462 INFO L78 Accepts]: Start accepts. Automaton has 1414 states and 2271 transitions. Word has length 68 [2021-11-25 18:19:08,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:19:08,463 INFO L470 AbstractCegarLoop]: Abstraction has 1414 states and 2271 transitions. [2021-11-25 18:19:08,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 4 states have internal predecessors, (42), 2 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-25 18:19:08,463 INFO L276 IsEmpty]: Start isEmpty. Operand 1414 states and 2271 transitions. [2021-11-25 18:19:08,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-25 18:19:08,467 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:19:08,467 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] [2021-11-25 18:19:08,515 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:19:08,690 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:08,690 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:19:08,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:19:08,691 INFO L85 PathProgramCache]: Analyzing trace with hash 1396583808, now seen corresponding path program 1 times [2021-11-25 18:19:08,691 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:19:08,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243253405] [2021-11-25 18:19:08,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:08,692 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:19:08,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:08,839 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 18:19:08,839 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:19:08,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1243253405] [2021-11-25 18:19:08,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1243253405] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:19:08,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [413434706] [2021-11-25 18:19:08,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:08,841 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:08,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:19:08,842 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:19:08,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:19:09,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:09,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 1542 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 18:19:09,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:19:09,502 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:19:09,502 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:19:09,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [413434706] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:19:09,503 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:19:09,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-25 18:19:09,503 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038562084] [2021-11-25 18:19:09,504 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:19:09,504 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:19:09,504 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:19:09,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:19:09,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:19:09,505 INFO L87 Difference]: Start difference. First operand 1414 states and 2271 transitions. Second operand has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-25 18:19:10,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:19:10,365 INFO L93 Difference]: Finished difference Result 2533 states and 4052 transitions. [2021-11-25 18:19:10,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:19:10,366 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) Word has length 72 [2021-11-25 18:19:10,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:19:10,384 INFO L225 Difference]: With dead ends: 2533 [2021-11-25 18:19:10,384 INFO L226 Difference]: Without dead ends: 1572 [2021-11-25 18:19:10,394 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-11-25 18:19:10,395 INFO L933 BasicCegarLoop]: 699 mSDtfsCounter, 527 mSDsluCounter, 1400 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 535 SdHoareTripleChecker+Valid, 2013 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:19:10,396 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [535 Valid, 2013 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 18:19:10,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1572 states. [2021-11-25 18:19:10,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1572 to 1558. [2021-11-25 18:19:10,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1558 states, 1045 states have (on average 1.5196172248803828) internal successors, (1588), 1133 states have internal predecessors, (1588), 427 states have call successors, (427), 84 states have call predecessors, (427), 85 states have return successors, (456), 414 states have call predecessors, (456), 423 states have call successors, (456) [2021-11-25 18:19:10,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1558 states to 1558 states and 2471 transitions. [2021-11-25 18:19:10,542 INFO L78 Accepts]: Start accepts. Automaton has 1558 states and 2471 transitions. Word has length 72 [2021-11-25 18:19:10,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:19:10,543 INFO L470 AbstractCegarLoop]: Abstraction has 1558 states and 2471 transitions. [2021-11-25 18:19:10,543 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-25 18:19:10,543 INFO L276 IsEmpty]: Start isEmpty. Operand 1558 states and 2471 transitions. [2021-11-25 18:19:10,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-25 18:19:10,547 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:19:10,548 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] [2021-11-25 18:19:10,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:19:10,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:10,763 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:19:10,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:19:10,764 INFO L85 PathProgramCache]: Analyzing trace with hash -592867885, now seen corresponding path program 1 times [2021-11-25 18:19:10,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:19:10,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2047434728] [2021-11-25 18:19:10,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:10,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:19:10,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:10,903 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 18:19:10,903 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:19:10,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2047434728] [2021-11-25 18:19:10,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2047434728] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:19:10,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1998576969] [2021-11-25 18:19:10,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:10,904 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:10,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:19:10,906 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:19:10,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:19:11,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:11,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 1531 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:19:11,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:19:11,517 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:19:11,517 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:19:11,518 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1998576969] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:19:11,518 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:19:11,518 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-25 18:19:11,519 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725363548] [2021-11-25 18:19:11,519 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:19:11,520 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:19:11,520 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:19:11,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:19:11,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:19:11,521 INFO L87 Difference]: Start difference. First operand 1558 states and 2471 transitions. Second operand has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 2 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-25 18:19:11,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:19:11,875 INFO L93 Difference]: Finished difference Result 2921 states and 4685 transitions. [2021-11-25 18:19:11,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:19:11,876 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 2 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 73 [2021-11-25 18:19:11,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:19:11,892 INFO L225 Difference]: With dead ends: 2921 [2021-11-25 18:19:11,893 INFO L226 Difference]: Without dead ends: 1558 [2021-11-25 18:19:11,905 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:19:11,906 INFO L933 BasicCegarLoop]: 590 mSDtfsCounter, 279 mSDsluCounter, 1008 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 1534 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:19:11,907 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [290 Valid, 1534 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 158 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:19:11,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1558 states. [2021-11-25 18:19:12,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1558 to 1558. [2021-11-25 18:19:12,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1558 states, 1045 states have (on average 1.4851674641148325) internal successors, (1552), 1133 states have internal predecessors, (1552), 427 states have call successors, (427), 84 states have call predecessors, (427), 85 states have return successors, (456), 414 states have call predecessors, (456), 423 states have call successors, (456) [2021-11-25 18:19:12,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1558 states to 1558 states and 2435 transitions. [2021-11-25 18:19:12,029 INFO L78 Accepts]: Start accepts. Automaton has 1558 states and 2435 transitions. Word has length 73 [2021-11-25 18:19:12,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:19:12,030 INFO L470 AbstractCegarLoop]: Abstraction has 1558 states and 2435 transitions. [2021-11-25 18:19:12,030 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 2 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-25 18:19:12,031 INFO L276 IsEmpty]: Start isEmpty. Operand 1558 states and 2435 transitions. [2021-11-25 18:19:12,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-25 18:19:12,034 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:19:12,034 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:19:12,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:19:12,261 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:12,261 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:19:12,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:19:12,262 INFO L85 PathProgramCache]: Analyzing trace with hash -301825873, now seen corresponding path program 1 times [2021-11-25 18:19:12,262 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:19:12,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2144253841] [2021-11-25 18:19:12,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:12,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:19:12,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:12,486 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 18:19:12,486 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:19:12,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2144253841] [2021-11-25 18:19:12,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2144253841] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:19:12,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1550941784] [2021-11-25 18:19:12,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:12,488 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:12,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:19:12,490 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:19:12,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:19:12,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:12,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 1541 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 18:19:12,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:19:13,344 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:19:13,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:19:13,777 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 18:19:13,777 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1550941784] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 18:19:13,778 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:19:13,778 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [6, 9] total 16 [2021-11-25 18:19:13,778 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585151440] [2021-11-25 18:19:13,778 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:19:13,779 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 18:19:13,779 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:19:13,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 18:19:13,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2021-11-25 18:19:13,780 INFO L87 Difference]: Start difference. First operand 1558 states and 2435 transitions. Second operand has 9 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-25 18:19:17,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:19:17,907 INFO L93 Difference]: Finished difference Result 3843 states and 6232 transitions. [2021-11-25 18:19:17,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 18:19:17,908 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) Word has length 75 [2021-11-25 18:19:17,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:19:17,942 INFO L225 Difference]: With dead ends: 3843 [2021-11-25 18:19:17,942 INFO L226 Difference]: Without dead ends: 2883 [2021-11-25 18:19:17,956 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=145, Invalid=725, Unknown=0, NotChecked=0, Total=870 [2021-11-25 18:19:17,961 INFO L933 BasicCegarLoop]: 697 mSDtfsCounter, 2253 mSDsluCounter, 2771 mSDsCounter, 0 mSdLazyCounter, 2629 mSolverCounterSat, 1023 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2332 SdHoareTripleChecker+Valid, 3318 SdHoareTripleChecker+Invalid, 3652 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1023 IncrementalHoareTripleChecker+Valid, 2629 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:19:17,961 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2332 Valid, 3318 Invalid, 3652 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1023 Valid, 2629 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2021-11-25 18:19:17,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2883 states. [2021-11-25 18:19:18,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2883 to 2419. [2021-11-25 18:19:18,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2419 states, 1720 states have (on average 1.4924418604651162) internal successors, (2567), 1815 states have internal predecessors, (2567), 548 states have call successors, (548), 145 states have call predecessors, (548), 150 states have return successors, (656), 530 states have call predecessors, (656), 543 states have call successors, (656) [2021-11-25 18:19:18,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2419 states to 2419 states and 3771 transitions. [2021-11-25 18:19:18,271 INFO L78 Accepts]: Start accepts. Automaton has 2419 states and 3771 transitions. Word has length 75 [2021-11-25 18:19:18,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:19:18,272 INFO L470 AbstractCegarLoop]: Abstraction has 2419 states and 3771 transitions. [2021-11-25 18:19:18,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-25 18:19:18,274 INFO L276 IsEmpty]: Start isEmpty. Operand 2419 states and 3771 transitions. [2021-11-25 18:19:18,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-25 18:19:18,282 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:19:18,282 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] [2021-11-25 18:19:18,331 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 18:19:18,497 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:18,497 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:19:18,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:19:18,498 INFO L85 PathProgramCache]: Analyzing trace with hash -1898010201, now seen corresponding path program 1 times [2021-11-25 18:19:18,498 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:19:18,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1066888084] [2021-11-25 18:19:18,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:18,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:19:18,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:18,635 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 18:19:18,635 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:19:18,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1066888084] [2021-11-25 18:19:18,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1066888084] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:19:18,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1152798596] [2021-11-25 18:19:18,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:18,636 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:18,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:19:18,637 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:19:18,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 18:19:18,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:19,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 1531 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:19:19,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:19:19,245 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:19:19,246 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:19:19,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1152798596] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:19:19,246 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:19:19,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 18:19:19,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951044241] [2021-11-25 18:19:19,247 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:19:19,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:19:19,247 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:19:19,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:19:19,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:19:19,248 INFO L87 Difference]: Start difference. First operand 2419 states and 3771 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-25 18:19:19,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:19:19,720 INFO L93 Difference]: Finished difference Result 5980 states and 9479 transitions. [2021-11-25 18:19:19,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:19:19,721 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 75 [2021-11-25 18:19:19,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:19:19,766 INFO L225 Difference]: With dead ends: 5980 [2021-11-25 18:19:19,766 INFO L226 Difference]: Without dead ends: 3573 [2021-11-25 18:19:19,791 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:19:19,792 INFO L933 BasicCegarLoop]: 818 mSDtfsCounter, 522 mSDsluCounter, 489 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 522 SdHoareTripleChecker+Valid, 1280 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:19:19,793 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [522 Valid, 1280 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:19:19,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3573 states. [2021-11-25 18:19:20,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3573 to 3505. [2021-11-25 18:19:20,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3505 states, 2502 states have (on average 1.4900079936051158) internal successors, (3728), 2645 states have internal predecessors, (3728), 784 states have call successors, (784), 207 states have call predecessors, (784), 218 states have return successors, (955), 760 states have call predecessors, (955), 779 states have call successors, (955) [2021-11-25 18:19:20,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3505 states to 3505 states and 5467 transitions. [2021-11-25 18:19:20,135 INFO L78 Accepts]: Start accepts. Automaton has 3505 states and 5467 transitions. Word has length 75 [2021-11-25 18:19:20,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:19:20,137 INFO L470 AbstractCegarLoop]: Abstraction has 3505 states and 5467 transitions. [2021-11-25 18:19:20,138 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-25 18:19:20,138 INFO L276 IsEmpty]: Start isEmpty. Operand 3505 states and 5467 transitions. [2021-11-25 18:19:20,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-25 18:19:20,142 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:19:20,143 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:19:20,191 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 18:19:20,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:20,365 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:19:20,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:19:20,366 INFO L85 PathProgramCache]: Analyzing trace with hash 1427051107, now seen corresponding path program 1 times [2021-11-25 18:19:20,366 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:19:20,366 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1141519965] [2021-11-25 18:19:20,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:20,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:19:20,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:20,505 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 18:19:20,505 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:19:20,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1141519965] [2021-11-25 18:19:20,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1141519965] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:19:20,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1665008103] [2021-11-25 18:19:20,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:20,506 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:20,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:19:20,509 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:19:20,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 18:19:20,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:20,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 1543 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:19:20,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:19:21,089 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:19:21,089 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:19:21,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1665008103] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:19:21,090 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:19:21,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-25 18:19:21,093 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636775470] [2021-11-25 18:19:21,093 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:19:21,094 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:19:21,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:19:21,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:19:21,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:19:21,095 INFO L87 Difference]: Start difference. First operand 3505 states and 5467 transitions. Second operand has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-25 18:19:21,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:19:21,992 INFO L93 Difference]: Finished difference Result 7281 states and 11525 transitions. [2021-11-25 18:19:21,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:19:21,993 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) Word has length 76 [2021-11-25 18:19:21,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:19:22,045 INFO L225 Difference]: With dead ends: 7281 [2021-11-25 18:19:22,045 INFO L226 Difference]: Without dead ends: 3788 [2021-11-25 18:19:22,079 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:19:22,080 INFO L933 BasicCegarLoop]: 692 mSDtfsCounter, 569 mSDsluCounter, 1253 mSDsCounter, 0 mSdLazyCounter, 306 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 624 SdHoareTripleChecker+Valid, 1885 SdHoareTripleChecker+Invalid, 440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:19:22,081 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [624 Valid, 1885 Invalid, 440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 306 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 18:19:22,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3788 states. [2021-11-25 18:19:22,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3788 to 3420. [2021-11-25 18:19:22,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3420 states, 2429 states have (on average 1.4804446274186909) internal successors, (3596), 2574 states have internal predecessors, (3596), 784 states have call successors, (784), 193 states have call predecessors, (784), 206 states have return successors, (1017), 748 states have call predecessors, (1017), 779 states have call successors, (1017) [2021-11-25 18:19:22,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3420 states to 3420 states and 5397 transitions. [2021-11-25 18:19:22,500 INFO L78 Accepts]: Start accepts. Automaton has 3420 states and 5397 transitions. Word has length 76 [2021-11-25 18:19:22,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:19:22,501 INFO L470 AbstractCegarLoop]: Abstraction has 3420 states and 5397 transitions. [2021-11-25 18:19:22,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-25 18:19:22,503 INFO L276 IsEmpty]: Start isEmpty. Operand 3420 states and 5397 transitions. [2021-11-25 18:19:22,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-25 18:19:22,507 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:19:22,507 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:19:22,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 18:19:22,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-25 18:19:22,733 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:19:22,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:19:22,733 INFO L85 PathProgramCache]: Analyzing trace with hash -1900902815, now seen corresponding path program 1 times [2021-11-25 18:19:22,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:19:22,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309373005] [2021-11-25 18:19:22,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:22,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:19:22,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:22,859 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 18:19:22,860 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:19:22,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309373005] [2021-11-25 18:19:22,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309373005] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:19:22,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1454391238] [2021-11-25 18:19:22,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:22,861 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:22,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:19:22,862 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:19:22,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 18:19:23,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:23,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 1558 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 18:19:23,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:19:23,491 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:19:23,491 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:19:23,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1454391238] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:19:23,492 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:19:23,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-25 18:19:23,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246171193] [2021-11-25 18:19:23,493 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:19:23,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:19:23,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:19:23,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:19:23,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:19:23,495 INFO L87 Difference]: Start difference. First operand 3420 states and 5397 transitions. Second operand has 5 states, 5 states have (on average 9.4) internal successors, (47), 5 states have internal predecessors, (47), 4 states have call successors, (16), 3 states have call predecessors, (16), 4 states have return successors, (14), 3 states have call predecessors, (14), 4 states have call successors, (14) [2021-11-25 18:19:24,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:19:24,431 INFO L93 Difference]: Finished difference Result 6280 states and 9942 transitions. [2021-11-25 18:19:24,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:19:24,432 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.4) internal successors, (47), 5 states have internal predecessors, (47), 4 states have call successors, (16), 3 states have call predecessors, (16), 4 states have return successors, (14), 3 states have call predecessors, (14), 4 states have call successors, (14) Word has length 79 [2021-11-25 18:19:24,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:19:24,476 INFO L225 Difference]: With dead ends: 6280 [2021-11-25 18:19:24,476 INFO L226 Difference]: Without dead ends: 3441 [2021-11-25 18:19:24,505 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:19:24,508 INFO L933 BasicCegarLoop]: 724 mSDtfsCounter, 407 mSDsluCounter, 1916 mSDsCounter, 0 mSdLazyCounter, 347 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 407 SdHoareTripleChecker+Valid, 2539 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 347 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:19:24,508 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [407 Valid, 2539 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 347 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 18:19:24,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3441 states. [2021-11-25 18:19:24,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3441 to 3424. [2021-11-25 18:19:24,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3424 states, 2429 states have (on average 1.4804446274186909) internal successors, (3596), 2578 states have internal predecessors, (3596), 788 states have call successors, (788), 193 states have call predecessors, (788), 206 states have return successors, (1021), 748 states have call predecessors, (1021), 783 states have call successors, (1021) [2021-11-25 18:19:24,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3424 states to 3424 states and 5405 transitions. [2021-11-25 18:19:24,821 INFO L78 Accepts]: Start accepts. Automaton has 3424 states and 5405 transitions. Word has length 79 [2021-11-25 18:19:24,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:19:24,822 INFO L470 AbstractCegarLoop]: Abstraction has 3424 states and 5405 transitions. [2021-11-25 18:19:24,822 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.4) internal successors, (47), 5 states have internal predecessors, (47), 4 states have call successors, (16), 3 states have call predecessors, (16), 4 states have return successors, (14), 3 states have call predecessors, (14), 4 states have call successors, (14) [2021-11-25 18:19:24,822 INFO L276 IsEmpty]: Start isEmpty. Operand 3424 states and 5405 transitions. [2021-11-25 18:19:24,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-25 18:19:24,827 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:19:24,828 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:19:24,876 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 18:19:25,044 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:25,044 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:19:25,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:19:25,045 INFO L85 PathProgramCache]: Analyzing trace with hash -839992010, now seen corresponding path program 1 times [2021-11-25 18:19:25,045 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:19:25,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640934882] [2021-11-25 18:19:25,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:25,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:19:25,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:25,176 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 18:19:25,176 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:19:25,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640934882] [2021-11-25 18:19:25,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640934882] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:19:25,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [545475146] [2021-11-25 18:19:25,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:25,177 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:25,177 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:19:25,178 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:19:25,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 18:19:25,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:25,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 1630 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 18:19:25,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:19:25,790 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 18:19:25,791 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:19:25,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [545475146] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:19:25,791 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:19:25,792 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-25 18:19:25,792 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422577531] [2021-11-25 18:19:25,792 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:19:25,793 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:19:25,793 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:19:25,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:19:25,794 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:19:25,794 INFO L87 Difference]: Start difference. First operand 3424 states and 5405 transitions. Second operand has 5 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-25 18:19:26,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:19:26,217 INFO L93 Difference]: Finished difference Result 6597 states and 10654 transitions. [2021-11-25 18:19:26,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:19:26,218 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 2 states have call successors, (18) Word has length 99 [2021-11-25 18:19:26,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:19:26,259 INFO L225 Difference]: With dead ends: 6597 [2021-11-25 18:19:26,259 INFO L226 Difference]: Without dead ends: 3615 [2021-11-25 18:19:26,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:19:26,281 INFO L933 BasicCegarLoop]: 560 mSDtfsCounter, 13 mSDsluCounter, 1746 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 2210 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:19:26,282 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 2210 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:19:26,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3615 states. [2021-11-25 18:19:26,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3615 to 3498. [2021-11-25 18:19:26,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3498 states, 2479 states have (on average 1.4707543364259783) internal successors, (3646), 2637 states have internal predecessors, (3646), 792 states have call successors, (792), 193 states have call predecessors, (792), 226 states have return successors, (1143), 763 states have call predecessors, (1143), 787 states have call successors, (1143) [2021-11-25 18:19:26,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3498 states to 3498 states and 5581 transitions. [2021-11-25 18:19:26,584 INFO L78 Accepts]: Start accepts. Automaton has 3498 states and 5581 transitions. Word has length 99 [2021-11-25 18:19:26,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:19:26,585 INFO L470 AbstractCegarLoop]: Abstraction has 3498 states and 5581 transitions. [2021-11-25 18:19:26,585 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-25 18:19:26,586 INFO L276 IsEmpty]: Start isEmpty. Operand 3498 states and 5581 transitions. [2021-11-25 18:19:26,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-25 18:19:26,596 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:19:26,596 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:19:26,642 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 18:19:26,818 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 18:19:26,818 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:19:26,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:19:26,819 INFO L85 PathProgramCache]: Analyzing trace with hash 1317662866, now seen corresponding path program 1 times [2021-11-25 18:19:26,819 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:19:26,819 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591837709] [2021-11-25 18:19:26,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:26,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:19:26,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:27,023 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:19:27,024 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:19:27,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591837709] [2021-11-25 18:19:27,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1591837709] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:19:27,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [927149579] [2021-11-25 18:19:27,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:27,025 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:27,025 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:19:27,026 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:19:27,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 18:19:27,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:27,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 1863 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:19:27,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:19:27,790 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 39 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:19:27,791 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:19:27,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [927149579] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:19:27,791 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:19:27,791 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 14 [2021-11-25 18:19:27,792 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615281160] [2021-11-25 18:19:27,792 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:19:27,793 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:19:27,793 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:19:27,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:19:27,794 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-11-25 18:19:27,794 INFO L87 Difference]: Start difference. First operand 3498 states and 5581 transitions. Second operand has 8 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 5 states have call successors, (21), 4 states have call predecessors, (21), 5 states have return successors, (19), 5 states have call predecessors, (19), 5 states have call successors, (19) [2021-11-25 18:19:31,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:19:31,783 INFO L93 Difference]: Finished difference Result 7783 states and 12613 transitions. [2021-11-25 18:19:31,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 18:19:31,784 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 5 states have call successors, (21), 4 states have call predecessors, (21), 5 states have return successors, (19), 5 states have call predecessors, (19), 5 states have call successors, (19) Word has length 117 [2021-11-25 18:19:31,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:19:31,839 INFO L225 Difference]: With dead ends: 7783 [2021-11-25 18:19:31,840 INFO L226 Difference]: Without dead ends: 4181 [2021-11-25 18:19:31,860 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=96, Invalid=504, Unknown=0, NotChecked=0, Total=600 [2021-11-25 18:19:31,861 INFO L933 BasicCegarLoop]: 641 mSDtfsCounter, 1612 mSDsluCounter, 1266 mSDsCounter, 0 mSdLazyCounter, 3379 mSolverCounterSat, 1076 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1643 SdHoareTripleChecker+Valid, 1787 SdHoareTripleChecker+Invalid, 4455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1076 IncrementalHoareTripleChecker+Valid, 3379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:19:31,861 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1643 Valid, 1787 Invalid, 4455 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1076 Valid, 3379 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2021-11-25 18:19:31,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4181 states. [2021-11-25 18:19:32,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4181 to 3493. [2021-11-25 18:19:32,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3493 states, 2474 states have (on average 1.471301535974131) internal successors, (3640), 2632 states have internal predecessors, (3640), 792 states have call successors, (792), 193 states have call predecessors, (792), 226 states have return successors, (1143), 763 states have call predecessors, (1143), 787 states have call successors, (1143) [2021-11-25 18:19:32,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3493 states to 3493 states and 5575 transitions. [2021-11-25 18:19:32,215 INFO L78 Accepts]: Start accepts. Automaton has 3493 states and 5575 transitions. Word has length 117 [2021-11-25 18:19:32,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:19:32,215 INFO L470 AbstractCegarLoop]: Abstraction has 3493 states and 5575 transitions. [2021-11-25 18:19:32,216 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 5 states have call successors, (21), 4 states have call predecessors, (21), 5 states have return successors, (19), 5 states have call predecessors, (19), 5 states have call successors, (19) [2021-11-25 18:19:32,216 INFO L276 IsEmpty]: Start isEmpty. Operand 3493 states and 5575 transitions. [2021-11-25 18:19:32,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-25 18:19:32,226 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:19:32,226 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:19:32,271 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 18:19:32,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 18:19:32,441 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:19:32,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:19:32,442 INFO L85 PathProgramCache]: Analyzing trace with hash 2095557858, now seen corresponding path program 1 times [2021-11-25 18:19:32,442 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:19:32,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674219691] [2021-11-25 18:19:32,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:32,442 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:19:32,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:32,723 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 22 proven. 3 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 18:19:32,724 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:19:32,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674219691] [2021-11-25 18:19:32,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674219691] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:19:32,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045612003] [2021-11-25 18:19:32,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:32,725 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:32,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:19:32,726 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:19:32,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 18:19:33,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:33,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 1874 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:19:33,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:19:33,432 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:19:33,432 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:19:33,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045612003] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:19:33,432 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:19:33,433 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2021-11-25 18:19:33,434 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288595896] [2021-11-25 18:19:33,435 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:19:33,435 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:19:33,436 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:19:33,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:19:33,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:19:33,437 INFO L87 Difference]: Start difference. First operand 3493 states and 5575 transitions. Second operand has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 3 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) [2021-11-25 18:19:33,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:19:33,890 INFO L93 Difference]: Finished difference Result 8154 states and 13245 transitions. [2021-11-25 18:19:33,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:19:33,891 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 3 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) Word has length 118 [2021-11-25 18:19:33,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:19:33,949 INFO L225 Difference]: With dead ends: 8154 [2021-11-25 18:19:33,949 INFO L226 Difference]: Without dead ends: 4673 [2021-11-25 18:19:33,972 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:19:33,974 INFO L933 BasicCegarLoop]: 772 mSDtfsCounter, 459 mSDsluCounter, 562 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 459 SdHoareTripleChecker+Valid, 1305 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:19:33,974 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [459 Valid, 1305 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:19:33,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4673 states. [2021-11-25 18:19:34,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4673 to 4605. [2021-11-25 18:19:34,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4605 states, 3272 states have (on average 1.4734107579462103) internal successors, (4821), 3486 states have internal predecessors, (4821), 1033 states have call successors, (1033), 252 states have call predecessors, (1033), 299 states have return successors, (1482), 998 states have call predecessors, (1482), 1028 states have call successors, (1482) [2021-11-25 18:19:34,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4605 states to 4605 states and 7336 transitions. [2021-11-25 18:19:34,538 INFO L78 Accepts]: Start accepts. Automaton has 4605 states and 7336 transitions. Word has length 118 [2021-11-25 18:19:34,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:19:34,539 INFO L470 AbstractCegarLoop]: Abstraction has 4605 states and 7336 transitions. [2021-11-25 18:19:34,539 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 3 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) [2021-11-25 18:19:34,540 INFO L276 IsEmpty]: Start isEmpty. Operand 4605 states and 7336 transitions. [2021-11-25 18:19:34,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-25 18:19:34,556 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:19:34,556 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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] [2021-11-25 18:19:34,604 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 18:19:34,769 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:34,769 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:19:34,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:19:34,770 INFO L85 PathProgramCache]: Analyzing trace with hash -31349416, now seen corresponding path program 1 times [2021-11-25 18:19:34,770 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:19:34,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531788038] [2021-11-25 18:19:34,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:34,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:19:34,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:34,957 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 25 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 18:19:34,958 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:19:34,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531788038] [2021-11-25 18:19:34,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [531788038] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:19:34,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1680302370] [2021-11-25 18:19:34,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:34,959 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:34,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:19:34,960 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:19:34,988 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 18:19:35,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:35,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 1889 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 18:19:35,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:19:35,702 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 18:19:35,703 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:19:35,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1680302370] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:19:35,703 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:19:35,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2021-11-25 18:19:35,704 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872606930] [2021-11-25 18:19:35,704 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:19:35,705 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:19:35,705 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:19:35,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:19:35,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-11-25 18:19:35,706 INFO L87 Difference]: Start difference. First operand 4605 states and 7336 transitions. Second operand has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2021-11-25 18:19:37,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:19:37,158 INFO L93 Difference]: Finished difference Result 9235 states and 15075 transitions. [2021-11-25 18:19:37,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:19:37,160 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) Word has length 123 [2021-11-25 18:19:37,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:19:37,207 INFO L225 Difference]: With dead ends: 9235 [2021-11-25 18:19:37,207 INFO L226 Difference]: Without dead ends: 5475 [2021-11-25 18:19:37,235 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:19:37,237 INFO L933 BasicCegarLoop]: 598 mSDtfsCounter, 671 mSDsluCounter, 627 mSDsCounter, 0 mSdLazyCounter, 604 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 726 SdHoareTripleChecker+Valid, 1172 SdHoareTripleChecker+Invalid, 766 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:19:37,237 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [726 Valid, 1172 Invalid, 766 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 604 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 18:19:37,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5475 states. [2021-11-25 18:19:37,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5475 to 5359. [2021-11-25 18:19:37,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5359 states, 3708 states have (on average 1.4684466019417475) internal successors, (5445), 3968 states have internal predecessors, (5445), 1288 states have call successors, (1288), 324 states have call predecessors, (1288), 362 states have return successors, (1784), 1246 states have call predecessors, (1784), 1281 states have call successors, (1784) [2021-11-25 18:19:37,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5359 states to 5359 states and 8517 transitions. [2021-11-25 18:19:37,709 INFO L78 Accepts]: Start accepts. Automaton has 5359 states and 8517 transitions. Word has length 123 [2021-11-25 18:19:37,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:19:37,713 INFO L470 AbstractCegarLoop]: Abstraction has 5359 states and 8517 transitions. [2021-11-25 18:19:37,713 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2021-11-25 18:19:37,713 INFO L276 IsEmpty]: Start isEmpty. Operand 5359 states and 8517 transitions. [2021-11-25 18:19:37,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-25 18:19:37,727 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:19:37,727 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:19:37,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 18:19:37,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 18:19:37,945 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:19:37,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:19:37,945 INFO L85 PathProgramCache]: Analyzing trace with hash 1200837506, now seen corresponding path program 1 times [2021-11-25 18:19:37,946 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:19:37,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462583305] [2021-11-25 18:19:37,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:37,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:19:38,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:38,158 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 19 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 18:19:38,158 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:19:38,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462583305] [2021-11-25 18:19:38,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1462583305] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:19:38,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55206608] [2021-11-25 18:19:38,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:38,159 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:38,159 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:19:38,161 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:19:38,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 18:19:38,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:38,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 1891 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 18:19:38,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:19:38,844 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 45 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 18:19:38,844 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:19:38,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [55206608] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:19:38,845 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:19:38,845 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2021-11-25 18:19:38,845 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962327769] [2021-11-25 18:19:38,845 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:19:38,846 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:19:38,847 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:19:38,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:19:38,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-11-25 18:19:38,848 INFO L87 Difference]: Start difference. First operand 5359 states and 8517 transitions. Second operand has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2021-11-25 18:19:40,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:19:40,457 INFO L93 Difference]: Finished difference Result 12851 states and 20864 transitions. [2021-11-25 18:19:40,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:19:40,458 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) Word has length 124 [2021-11-25 18:19:40,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:19:40,520 INFO L225 Difference]: With dead ends: 12851 [2021-11-25 18:19:40,520 INFO L226 Difference]: Without dead ends: 8315 [2021-11-25 18:19:40,557 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:19:40,558 INFO L933 BasicCegarLoop]: 851 mSDtfsCounter, 551 mSDsluCounter, 826 mSDsCounter, 0 mSdLazyCounter, 729 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 611 SdHoareTripleChecker+Valid, 1609 SdHoareTripleChecker+Invalid, 880 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 729 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:19:40,558 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [611 Valid, 1609 Invalid, 880 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 729 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 18:19:40,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8315 states. [2021-11-25 18:19:41,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8315 to 8297. [2021-11-25 18:19:41,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8297 states, 5632 states have (on average 1.4723011363636365) internal successors, (8292), 6066 states have internal predecessors, (8292), 2106 states have call successors, (2106), 518 states have call predecessors, (2106), 558 states have return successors, (2790), 2036 states have call predecessors, (2790), 2095 states have call successors, (2790) [2021-11-25 18:19:41,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8297 states to 8297 states and 13188 transitions. [2021-11-25 18:19:41,472 INFO L78 Accepts]: Start accepts. Automaton has 8297 states and 13188 transitions. Word has length 124 [2021-11-25 18:19:41,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:19:41,473 INFO L470 AbstractCegarLoop]: Abstraction has 8297 states and 13188 transitions. [2021-11-25 18:19:41,473 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2021-11-25 18:19:41,474 INFO L276 IsEmpty]: Start isEmpty. Operand 8297 states and 13188 transitions. [2021-11-25 18:19:41,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-25 18:19:41,496 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:19:41,496 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:19:41,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 18:19:41,721 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 18:19:41,721 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:19:41,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:19:41,721 INFO L85 PathProgramCache]: Analyzing trace with hash -796407116, now seen corresponding path program 1 times [2021-11-25 18:19:41,722 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:19:41,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764496878] [2021-11-25 18:19:41,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:41,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:19:41,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:41,903 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 19 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 18:19:41,904 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:19:41,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764496878] [2021-11-25 18:19:41,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [764496878] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:19:41,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [965515481] [2021-11-25 18:19:41,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:41,905 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:41,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:19:41,906 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:19:41,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 18:19:42,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:42,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 1892 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 18:19:42,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:19:42,630 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 18:19:42,630 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:19:42,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [965515481] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:19:42,631 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:19:42,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 15 [2021-11-25 18:19:42,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441367602] [2021-11-25 18:19:42,632 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:19:42,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 18:19:42,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:19:42,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 18:19:42,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2021-11-25 18:19:42,634 INFO L87 Difference]: Start difference. First operand 8297 states and 13188 transitions. Second operand has 9 states, 7 states have (on average 11.142857142857142) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (23), 3 states have call predecessors, (23), 5 states have return successors, (21), 5 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-25 18:19:44,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:19:44,757 INFO L93 Difference]: Finished difference Result 20700 states and 33321 transitions. [2021-11-25 18:19:44,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 18:19:44,758 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 11.142857142857142) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (23), 3 states have call predecessors, (23), 5 states have return successors, (21), 5 states have call predecessors, (21), 3 states have call successors, (21) Word has length 125 [2021-11-25 18:19:44,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:19:44,886 INFO L225 Difference]: With dead ends: 20700 [2021-11-25 18:19:44,886 INFO L226 Difference]: Without dead ends: 13248 [2021-11-25 18:19:45,003 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-11-25 18:19:45,004 INFO L933 BasicCegarLoop]: 687 mSDtfsCounter, 653 mSDsluCounter, 4213 mSDsCounter, 0 mSdLazyCounter, 1176 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 712 SdHoareTripleChecker+Valid, 4673 SdHoareTripleChecker+Invalid, 1311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 1176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:19:45,005 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [712 Valid, 4673 Invalid, 1311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 1176 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 18:19:45,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13248 states. [2021-11-25 18:19:46,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13248 to 11769. [2021-11-25 18:19:46,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11769 states, 7932 states have (on average 1.4747856782652546) internal successors, (11698), 8561 states have internal predecessors, (11698), 3063 states have call successors, (3063), 720 states have call predecessors, (3063), 773 states have return successors, (4197), 2979 states have call predecessors, (4197), 3046 states have call successors, (4197) [2021-11-25 18:19:46,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11769 states to 11769 states and 18958 transitions. [2021-11-25 18:19:46,441 INFO L78 Accepts]: Start accepts. Automaton has 11769 states and 18958 transitions. Word has length 125 [2021-11-25 18:19:46,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:19:46,441 INFO L470 AbstractCegarLoop]: Abstraction has 11769 states and 18958 transitions. [2021-11-25 18:19:46,442 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 11.142857142857142) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (23), 3 states have call predecessors, (23), 5 states have return successors, (21), 5 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-25 18:19:46,442 INFO L276 IsEmpty]: Start isEmpty. Operand 11769 states and 18958 transitions. [2021-11-25 18:19:46,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-25 18:19:46,456 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:19:46,457 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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] [2021-11-25 18:19:46,506 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 18:19:46,677 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 18:19:46,677 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:19:46,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:19:46,677 INFO L85 PathProgramCache]: Analyzing trace with hash -684200179, now seen corresponding path program 1 times [2021-11-25 18:19:46,678 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:19:46,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045628420] [2021-11-25 18:19:46,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:46,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:19:46,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:46,835 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 25 proven. 3 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 18:19:46,835 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:19:46,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045628420] [2021-11-25 18:19:46,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2045628420] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:19:46,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1547022588] [2021-11-25 18:19:46,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:19:46,836 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:19:46,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:19:46,837 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:19:46,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 18:19:47,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:19:47,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 1905 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 18:19:47,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:19:47,596 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 55 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 18:19:47,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:19:48,102 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 29 proven. 2 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:19:48,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1547022588] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:19:48,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [82790773] [2021-11-25 18:19:48,136 INFO L159 IcfgInterpreter]: Started Sifa with 79 locations of interest [2021-11-25 18:19:48,136 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:19:48,143 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:19:48,150 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:19:48,151 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:19:57,779 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 677 for LOIs [2021-11-25 18:20:40,248 INFO L197 IcfgInterpreter]: Interpreting procedure __automaton_fail with input of size 29 for LOIs [2021-11-25 18:20:40,253 INFO L197 IcfgInterpreter]: Interpreting procedure stopRequestedInDirection with input of size 42 for LOIs [2021-11-25 18:20:40,639 INFO L197 IcfgInterpreter]: Interpreting procedure isTopFloor with input of size 36 for LOIs [2021-11-25 18:20:40,643 INFO L197 IcfgInterpreter]: Interpreting procedure isFloorCalling with input of size 448 for LOIs [2021-11-25 18:20:40,788 INFO L197 IcfgInterpreter]: Interpreting procedure buttonForFloorIsPressed with input of size 51 for LOIs [2021-11-25 18:20:40,806 INFO L197 IcfgInterpreter]: Interpreting procedure initTopDown with input of size 595 for LOIs [2021-11-25 18:20:42,908 INFO L197 IcfgInterpreter]: Interpreting procedure initFloors with input of size 569 for LOIs [2021-11-25 18:20:43,111 INFO L197 IcfgInterpreter]: Interpreting procedure continueInDirection with input of size 39 for LOIs [2021-11-25 18:20:43,129 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentHeading with input of size 30 for LOIs [2021-11-25 18:20:43,134 INFO L197 IcfgInterpreter]: Interpreting procedure bobCall with input of size 569 for LOIs [2021-11-25 18:20:46,945 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 573 for LOIs [2021-11-25 18:20:47,667 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 501 for LOIs [2021-11-25 18:20:47,839 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:21:18,139 WARN L227 SmtUtils]: Spent 6.33s on a formula simplification. DAG size of input: 641 DAG size of output: 588 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:21:24,717 WARN L227 SmtUtils]: Spent 6.28s on a formula simplification. DAG size of input: 641 DAG size of output: 588 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:21:49,946 WARN L227 SmtUtils]: Spent 11.77s on a formula simplification. DAG size of input: 677 DAG size of output: 583 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:22:03,814 WARN L227 SmtUtils]: Spent 12.89s on a formula simplification. DAG size of input: 633 DAG size of output: 609 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:22:21,269 WARN L227 SmtUtils]: Spent 15.95s on a formula simplification. DAG size of input: 668 DAG size of output: 615 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:22:37,699 WARN L227 SmtUtils]: Spent 15.20s on a formula simplification. DAG size of input: 668 DAG size of output: 614 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:22:55,781 WARN L227 SmtUtils]: Spent 15.40s on a formula simplification. DAG size of input: 669 DAG size of output: 610 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:23:15,087 WARN L227 SmtUtils]: Spent 16.70s on a formula simplification. DAG size of input: 680 DAG size of output: 614 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:23:32,792 WARN L227 SmtUtils]: Spent 16.09s on a formula simplification. DAG size of input: 667 DAG size of output: 614 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:23:41,060 WARN L227 SmtUtils]: Spent 6.78s on a formula simplification. DAG size of input: 668 DAG size of output: 581 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:24:16,955 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '226889#(and (= ~head~0.offset 0) (= ~currentHeading~0 1) (<= ~floorButtons_0~0 2147483647) (= ~head~0.base 0) (= |#NULL.offset| 0) (= 0 (+ ~expectedDirection~0 1)) (<= 0 (+ ~floorButtons_0~0 2147483648)) (<= 0 |#StackHeapBarrier|) (= ~cleanupTimeShifts~0 12) (= ~currentFloorID~0 1) (= |#NULL.base| 0))' at error location [2021-11-25 18:24:16,955 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:24:16,955 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:24:16,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2021-11-25 18:24:16,956 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758660446] [2021-11-25 18:24:16,956 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:24:16,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 18:24:16,957 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:24:16,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 18:24:16,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=492, Invalid=5514, Unknown=0, NotChecked=0, Total=6006 [2021-11-25 18:24:16,961 INFO L87 Difference]: Start difference. First operand 11769 states and 18958 transitions. Second operand has 19 states, 16 states have (on average 7.875) internal successors, (126), 16 states have internal predecessors, (126), 8 states have call successors, (49), 4 states have call predecessors, (49), 10 states have return successors, (48), 11 states have call predecessors, (48), 8 states have call successors, (48) [2021-11-25 18:24:38,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:24:38,924 INFO L93 Difference]: Finished difference Result 55866 states and 98541 transitions. [2021-11-25 18:24:38,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-25 18:24:38,925 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 7.875) internal successors, (126), 16 states have internal predecessors, (126), 8 states have call successors, (49), 4 states have call predecessors, (49), 10 states have return successors, (48), 11 states have call predecessors, (48), 8 states have call successors, (48) Word has length 127 [2021-11-25 18:24:38,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:24:39,320 INFO L225 Difference]: With dead ends: 55866 [2021-11-25 18:24:39,320 INFO L226 Difference]: Without dead ends: 39176 [2021-11-25 18:24:39,551 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 331 SyntacticMatches, 14 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11735 ImplicationChecksByTransitivity, 212.5s TimeCoverageRelationStatistics Valid=1590, Invalid=26802, Unknown=0, NotChecked=0, Total=28392 [2021-11-25 18:24:39,552 INFO L933 BasicCegarLoop]: 1246 mSDtfsCounter, 6017 mSDsluCounter, 7866 mSDsCounter, 0 mSdLazyCounter, 19541 mSolverCounterSat, 3987 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6169 SdHoareTripleChecker+Valid, 8651 SdHoareTripleChecker+Invalid, 23528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 3987 IncrementalHoareTripleChecker+Valid, 19541 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:24:39,553 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6169 Valid, 8651 Invalid, 23528 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [3987 Valid, 19541 Invalid, 0 Unknown, 0 Unchecked, 15.1s Time] [2021-11-25 18:24:39,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39176 states. [2021-11-25 18:24:42,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39176 to 30596. [2021-11-25 18:24:42,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30596 states, 20767 states have (on average 1.4646313863340876) internal successors, (30416), 22626 states have internal predecessors, (30416), 7923 states have call successors, (7923), 1659 states have call predecessors, (7923), 1905 states have return successors, (12987), 7322 states have call predecessors, (12987), 7895 states have call successors, (12987) [2021-11-25 18:24:43,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30596 states to 30596 states and 51326 transitions. [2021-11-25 18:24:43,265 INFO L78 Accepts]: Start accepts. Automaton has 30596 states and 51326 transitions. Word has length 127 [2021-11-25 18:24:43,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:24:43,266 INFO L470 AbstractCegarLoop]: Abstraction has 30596 states and 51326 transitions. [2021-11-25 18:24:43,266 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 7.875) internal successors, (126), 16 states have internal predecessors, (126), 8 states have call successors, (49), 4 states have call predecessors, (49), 10 states have return successors, (48), 11 states have call predecessors, (48), 8 states have call successors, (48) [2021-11-25 18:24:43,266 INFO L276 IsEmpty]: Start isEmpty. Operand 30596 states and 51326 transitions. [2021-11-25 18:24:43,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-25 18:24:43,289 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:24:43,290 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 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 18:24:43,337 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 18:24:43,517 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 18:24:43,517 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:24:43,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:24:43,518 INFO L85 PathProgramCache]: Analyzing trace with hash 796176557, now seen corresponding path program 1 times [2021-11-25 18:24:43,518 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:24:43,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [114542712] [2021-11-25 18:24:43,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:43,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:24:43,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:43,752 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 18:24:43,752 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:24:43,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [114542712] [2021-11-25 18:24:43,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [114542712] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:24:43,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [874999235] [2021-11-25 18:24:43,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:43,753 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:43,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:24:43,754 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:24:43,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 18:24:44,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:44,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 1708 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:24:44,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:24:44,629 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 18:24:44,629 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:24:44,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [874999235] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:24:44,629 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:24:44,629 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10] total 12 [2021-11-25 18:24:44,630 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989465327] [2021-11-25 18:24:44,630 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:24:44,630 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:24:44,630 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:24:44,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:24:44,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2021-11-25 18:24:44,631 INFO L87 Difference]: Start difference. First operand 30596 states and 51326 transitions. Second operand has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 4 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (22), 4 states have call predecessors, (22), 4 states have call successors, (22) [2021-11-25 18:24:47,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:24:47,226 INFO L93 Difference]: Finished difference Result 61840 states and 106531 transitions. [2021-11-25 18:24:47,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:24:47,227 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 4 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (22), 4 states have call predecessors, (22), 4 states have call successors, (22) Word has length 136 [2021-11-25 18:24:47,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:24:47,508 INFO L225 Difference]: With dead ends: 61840 [2021-11-25 18:24:47,509 INFO L226 Difference]: Without dead ends: 28547 [2021-11-25 18:24:48,106 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2021-11-25 18:24:48,106 INFO L933 BasicCegarLoop]: 604 mSDtfsCounter, 183 mSDsluCounter, 1006 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 1548 SdHoareTripleChecker+Invalid, 178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:24:48,107 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [193 Valid, 1548 Invalid, 178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:24:48,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28547 states. [2021-11-25 18:24:50,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28547 to 28490. [2021-11-25 18:24:50,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28490 states, 19021 states have (on average 1.4515535460806477) internal successors, (27610), 20855 states have internal predecessors, (27610), 7636 states have call successors, (7636), 1614 states have call predecessors, (7636), 1832 states have return successors, (12346), 7032 states have call predecessors, (12346), 7608 states have call successors, (12346) [2021-11-25 18:24:50,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28490 states to 28490 states and 47592 transitions. [2021-11-25 18:24:50,848 INFO L78 Accepts]: Start accepts. Automaton has 28490 states and 47592 transitions. Word has length 136 [2021-11-25 18:24:50,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:24:50,848 INFO L470 AbstractCegarLoop]: Abstraction has 28490 states and 47592 transitions. [2021-11-25 18:24:50,848 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 4 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (22), 4 states have call predecessors, (22), 4 states have call successors, (22) [2021-11-25 18:24:50,848 INFO L276 IsEmpty]: Start isEmpty. Operand 28490 states and 47592 transitions. [2021-11-25 18:24:50,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-25 18:24:50,875 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:24:50,876 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:24:50,920 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 18:24:51,099 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 18:24:51,100 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:24:51,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:24:51,101 INFO L85 PathProgramCache]: Analyzing trace with hash -1304544567, now seen corresponding path program 1 times [2021-11-25 18:24:51,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:24:51,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616870514] [2021-11-25 18:24:51,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:51,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:24:51,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:51,310 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 18:24:51,310 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:24:51,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616870514] [2021-11-25 18:24:51,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1616870514] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:24:51,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331138269] [2021-11-25 18:24:51,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:51,311 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:51,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:24:51,313 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:24:51,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 18:24:51,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:51,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 1712 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 18:24:51,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:24:52,017 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 20 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 18:24:52,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:24:52,771 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:24:52,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331138269] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:24:52,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1024232016] [2021-11-25 18:24:52,778 INFO L159 IcfgInterpreter]: Started Sifa with 119 locations of interest [2021-11-25 18:24:52,778 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:24:52,779 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:24:52,780 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:24:52,780 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:24:57,318 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 566 for LOIs [2021-11-25 18:25:03,216 INFO L197 IcfgInterpreter]: Interpreting procedure buttonForFloorIsPressed with input of size 491 for LOIs [2021-11-25 18:25:03,549 INFO L197 IcfgInterpreter]: Interpreting procedure initTopDown with input of size 595 for LOIs [2021-11-25 18:25:05,680 INFO L197 IcfgInterpreter]: Interpreting procedure initFloors with input of size 569 for LOIs [2021-11-25 18:25:05,869 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentHeading with input of size 438 for LOIs [2021-11-25 18:25:05,954 INFO L197 IcfgInterpreter]: Interpreting procedure bobCall with input of size 569 for LOIs [2021-11-25 18:25:09,754 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 573 for LOIs [2021-11-25 18:25:10,354 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 501 for LOIs [2021-11-25 18:25:10,510 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:25:39,867 WARN L227 SmtUtils]: Spent 6.41s on a formula simplification. DAG size of input: 641 DAG size of output: 588 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:25:46,575 WARN L227 SmtUtils]: Spent 6.39s on a formula simplification. DAG size of input: 641 DAG size of output: 588 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:26:16,592 WARN L227 SmtUtils]: Spent 5.21s on a formula simplification. DAG size of input: 618 DAG size of output: 589 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:26:22,146 WARN L227 SmtUtils]: Spent 5.17s on a formula simplification. DAG size of input: 616 DAG size of output: 589 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:26:40,190 WARN L227 SmtUtils]: Spent 5.25s on a formula simplification. DAG size of input: 622 DAG size of output: 591 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:26:55,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1024232016] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:26:55,641 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:26:55,641 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [10, 6, 7] total 42 [2021-11-25 18:26:55,641 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457558812] [2021-11-25 18:26:55,641 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:26:55,642 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-25 18:26:55,642 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:26:55,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-25 18:26:55,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1525, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 18:26:55,643 INFO L87 Difference]: Start difference. First operand 28490 states and 47592 transitions. Second operand has 27 states, 20 states have (on average 4.15) internal successors, (83), 15 states have internal predecessors, (83), 10 states have call successors, (24), 8 states have call predecessors, (24), 8 states have return successors, (22), 9 states have call predecessors, (22), 9 states have call successors, (22) [2021-11-25 18:27:44,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:27:44,098 INFO L93 Difference]: Finished difference Result 57090 states and 95354 transitions. [2021-11-25 18:27:44,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 18:27:44,109 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 20 states have (on average 4.15) internal successors, (83), 15 states have internal predecessors, (83), 10 states have call successors, (24), 8 states have call predecessors, (24), 8 states have return successors, (22), 9 states have call predecessors, (22), 9 states have call successors, (22) Word has length 140 [2021-11-25 18:27:44,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:27:44,356 INFO L225 Difference]: With dead ends: 57090 [2021-11-25 18:27:44,357 INFO L226 Difference]: Without dead ends: 28612 [2021-11-25 18:27:44,585 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 434 GetRequests, 381 SyntacticMatches, 8 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 128.2s TimeCoverageRelationStatistics Valid=238, Invalid=1924, Unknown=0, NotChecked=0, Total=2162 [2021-11-25 18:27:44,586 INFO L933 BasicCegarLoop]: 613 mSDtfsCounter, 132 mSDsluCounter, 4572 mSDsCounter, 0 mSdLazyCounter, 6077 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 5085 SdHoareTripleChecker+Invalid, 6128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 6077 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:27:44,586 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [146 Valid, 5085 Invalid, 6128 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [51 Valid, 6077 Invalid, 0 Unknown, 0 Unchecked, 23.6s Time] [2021-11-25 18:27:44,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28612 states. [2021-11-25 18:27:46,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28612 to 28533. [2021-11-25 18:27:46,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28533 states, 19054 states have (on average 1.45098142122389) internal successors, (27647), 20887 states have internal predecessors, (27647), 7642 states have call successors, (7642), 1619 states have call predecessors, (7642), 1836 states have return successors, (12348), 7038 states have call predecessors, (12348), 7614 states have call successors, (12348) [2021-11-25 18:27:46,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28533 states to 28533 states and 47637 transitions. [2021-11-25 18:27:46,548 INFO L78 Accepts]: Start accepts. Automaton has 28533 states and 47637 transitions. Word has length 140 [2021-11-25 18:27:46,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:27:46,548 INFO L470 AbstractCegarLoop]: Abstraction has 28533 states and 47637 transitions. [2021-11-25 18:27:46,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 20 states have (on average 4.15) internal successors, (83), 15 states have internal predecessors, (83), 10 states have call successors, (24), 8 states have call predecessors, (24), 8 states have return successors, (22), 9 states have call predecessors, (22), 9 states have call successors, (22) [2021-11-25 18:27:46,548 INFO L276 IsEmpty]: Start isEmpty. Operand 28533 states and 47637 transitions. [2021-11-25 18:27:46,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-25 18:27:46,567 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:27:46,567 INFO L514 BasicCegarLoop]: trace histogram [7, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:27:46,603 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-25 18:27:46,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 18:27:46,781 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:27:46,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:27:46,781 INFO L85 PathProgramCache]: Analyzing trace with hash 743065958, now seen corresponding path program 1 times [2021-11-25 18:27:46,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:27:46,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126488036] [2021-11-25 18:27:46,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:27:46,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:27:46,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:27:47,064 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 20 proven. 3 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2021-11-25 18:27:47,065 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:27:47,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126488036] [2021-11-25 18:27:47,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1126488036] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:27:47,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1195423356] [2021-11-25 18:27:47,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:27:47,065 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:27:47,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:27:47,066 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:27:47,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 18:27:47,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:27:47,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 1925 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 18:27:47,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:27:47,735 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 18:27:47,735 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:27:47,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1195423356] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:27:47,736 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:27:47,736 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [18] total 24 [2021-11-25 18:27:47,736 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223088309] [2021-11-25 18:27:47,736 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:27:47,736 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:27:47,736 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:27:47,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:27:47,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=489, Unknown=0, NotChecked=0, Total=552 [2021-11-25 18:27:47,737 INFO L87 Difference]: Start difference. First operand 28533 states and 47637 transitions. Second operand has 8 states, 7 states have (on average 12.0) internal successors, (84), 7 states have internal predecessors, (84), 3 states have call successors, (24), 3 states have call predecessors, (24), 5 states have return successors, (23), 4 states have call predecessors, (23), 3 states have call successors, (23) [2021-11-25 18:27:50,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:27:50,873 INFO L93 Difference]: Finished difference Result 54919 states and 92243 transitions. [2021-11-25 18:27:50,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 18:27:50,874 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 12.0) internal successors, (84), 7 states have internal predecessors, (84), 3 states have call successors, (24), 3 states have call predecessors, (24), 5 states have return successors, (23), 4 states have call predecessors, (23), 3 states have call successors, (23) Word has length 139 [2021-11-25 18:27:50,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:27:51,058 INFO L225 Difference]: With dead ends: 54919 [2021-11-25 18:27:51,059 INFO L226 Difference]: Without dead ends: 27832 [2021-11-25 18:27:51,290 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=676, Unknown=0, NotChecked=0, Total=756 [2021-11-25 18:27:51,291 INFO L933 BasicCegarLoop]: 935 mSDtfsCounter, 589 mSDsluCounter, 3841 mSDsCounter, 0 mSdLazyCounter, 1961 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 651 SdHoareTripleChecker+Valid, 4501 SdHoareTripleChecker+Invalid, 2106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 1961 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:27:51,292 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [651 Valid, 4501 Invalid, 2106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 1961 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 18:27:51,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27832 states. [2021-11-25 18:27:52,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27832 to 26215. [2021-11-25 18:27:52,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26215 states, 17570 states have (on average 1.4516220830961868) internal successors, (25505), 19194 states have internal predecessors, (25505), 6835 states have call successors, (6835), 1599 states have call predecessors, (6835), 1809 states have return successors, (10690), 6347 states have call predecessors, (10690), 6799 states have call successors, (10690) [2021-11-25 18:27:53,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26215 states to 26215 states and 43030 transitions. [2021-11-25 18:27:53,378 INFO L78 Accepts]: Start accepts. Automaton has 26215 states and 43030 transitions. Word has length 139 [2021-11-25 18:27:53,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:27:53,379 INFO L470 AbstractCegarLoop]: Abstraction has 26215 states and 43030 transitions. [2021-11-25 18:27:53,379 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 12.0) internal successors, (84), 7 states have internal predecessors, (84), 3 states have call successors, (24), 3 states have call predecessors, (24), 5 states have return successors, (23), 4 states have call predecessors, (23), 3 states have call successors, (23) [2021-11-25 18:27:53,379 INFO L276 IsEmpty]: Start isEmpty. Operand 26215 states and 43030 transitions. [2021-11-25 18:27:53,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-25 18:27:53,390 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:27:53,391 INFO L514 BasicCegarLoop]: trace histogram [7, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:27:53,429 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-11-25 18:27:53,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:27:53,605 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:27:53,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:27:53,605 INFO L85 PathProgramCache]: Analyzing trace with hash 859914875, now seen corresponding path program 1 times [2021-11-25 18:27:53,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:27:53,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144149959] [2021-11-25 18:27:53,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:27:53,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:27:53,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:27:54,087 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 20 proven. 3 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 18:27:54,088 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:27:54,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144149959] [2021-11-25 18:27:54,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [144149959] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:27:54,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [204076687] [2021-11-25 18:27:54,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:27:54,088 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:27:54,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:27:54,093 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:27:54,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 18:27:54,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:27:54,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 1940 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 18:27:54,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:27:54,669 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 53 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 18:27:54,669 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:27:54,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [204076687] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:27:54,669 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:27:54,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [18] total 24 [2021-11-25 18:27:54,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405057815] [2021-11-25 18:27:54,669 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:27:54,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:27:54,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:27:54,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:27:54,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=491, Unknown=0, NotChecked=0, Total=552 [2021-11-25 18:27:54,671 INFO L87 Difference]: Start difference. First operand 26215 states and 43030 transitions. Second operand has 8 states, 7 states have (on average 12.142857142857142) internal successors, (85), 7 states have internal predecessors, (85), 3 states have call successors, (25), 3 states have call predecessors, (25), 5 states have return successors, (24), 4 states have call predecessors, (24), 3 states have call successors, (24) [2021-11-25 18:27:57,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:27:57,417 INFO L93 Difference]: Finished difference Result 51047 states and 83487 transitions. [2021-11-25 18:27:57,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 18:27:57,418 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 12.142857142857142) internal successors, (85), 7 states have internal predecessors, (85), 3 states have call successors, (25), 3 states have call predecessors, (25), 5 states have return successors, (24), 4 states have call predecessors, (24), 3 states have call successors, (24) Word has length 142 [2021-11-25 18:27:57,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:27:57,600 INFO L225 Difference]: With dead ends: 51047 [2021-11-25 18:27:57,600 INFO L226 Difference]: Without dead ends: 26316 [2021-11-25 18:27:57,955 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-11-25 18:27:57,956 INFO L933 BasicCegarLoop]: 941 mSDtfsCounter, 550 mSDsluCounter, 4231 mSDsCounter, 0 mSdLazyCounter, 1749 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 606 SdHoareTripleChecker+Valid, 4891 SdHoareTripleChecker+Invalid, 1876 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 1749 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:27:57,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [606 Valid, 4891 Invalid, 1876 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 1749 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 18:27:57,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26316 states. [2021-11-25 18:27:59,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26316 to 26277. [2021-11-25 18:27:59,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26277 states, 17630 states have (on average 1.4500850822461713) internal successors, (25565), 19226 states have internal predecessors, (25565), 6837 states have call successors, (6837), 1629 states have call predecessors, (6837), 1809 states have return successors, (10634), 6347 states have call predecessors, (10634), 6801 states have call successors, (10634) [2021-11-25 18:27:59,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26277 states to 26277 states and 43036 transitions. [2021-11-25 18:27:59,698 INFO L78 Accepts]: Start accepts. Automaton has 26277 states and 43036 transitions. Word has length 142 [2021-11-25 18:27:59,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:27:59,698 INFO L470 AbstractCegarLoop]: Abstraction has 26277 states and 43036 transitions. [2021-11-25 18:27:59,699 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 12.142857142857142) internal successors, (85), 7 states have internal predecessors, (85), 3 states have call successors, (25), 3 states have call predecessors, (25), 5 states have return successors, (24), 4 states have call predecessors, (24), 3 states have call successors, (24) [2021-11-25 18:27:59,699 INFO L276 IsEmpty]: Start isEmpty. Operand 26277 states and 43036 transitions. [2021-11-25 18:27:59,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-25 18:27:59,709 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:27:59,709 INFO L514 BasicCegarLoop]: trace histogram [7, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:27:59,731 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-25 18:27:59,910 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:27:59,910 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:27:59,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:27:59,911 INFO L85 PathProgramCache]: Analyzing trace with hash -936881311, now seen corresponding path program 1 times [2021-11-25 18:27:59,911 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:27:59,911 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [592776680] [2021-11-25 18:27:59,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:27:59,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:27:59,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:28:00,178 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 24 proven. 3 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 18:28:00,178 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:28:00,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [592776680] [2021-11-25 18:28:00,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [592776680] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:28:00,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1086991275] [2021-11-25 18:28:00,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:28:00,179 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:28:00,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:28:00,180 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:28:00,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 18:28:00,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:28:00,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 1939 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:28:00,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:28:00,659 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-25 18:28:00,659 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:28:00,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1086991275] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:28:00,659 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:28:00,659 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [18] total 19 [2021-11-25 18:28:00,659 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119689312] [2021-11-25 18:28:00,659 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:28:00,660 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:28:00,660 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:28:00,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:28:00,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2021-11-25 18:28:00,660 INFO L87 Difference]: Start difference. First operand 26277 states and 43036 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (23), 2 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-25 18:28:02,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:28:02,530 INFO L93 Difference]: Finished difference Result 48002 states and 80266 transitions. [2021-11-25 18:28:02,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:28:02,531 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (23), 2 states have call predecessors, (23), 2 states have call successors, (23) Word has length 142 [2021-11-25 18:28:02,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:28:02,654 INFO L225 Difference]: With dead ends: 48002 [2021-11-25 18:28:02,655 INFO L226 Difference]: Without dead ends: 23161 [2021-11-25 18:28:03,108 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2021-11-25 18:28:03,109 INFO L933 BasicCegarLoop]: 722 mSDtfsCounter, 100 mSDsluCounter, 598 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 1288 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:28:03,109 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 1288 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:28:03,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23161 states. [2021-11-25 18:28:04,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23161 to 22950. [2021-11-25 18:28:04,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22950 states, 15479 states have (on average 1.438594224433103) internal successors, (22268), 16810 states have internal predecessors, (22268), 5869 states have call successors, (5869), 1446 states have call predecessors, (5869), 1601 states have return successors, (9115), 5455 states have call predecessors, (9115), 5833 states have call successors, (9115) [2021-11-25 18:28:04,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22950 states to 22950 states and 37252 transitions. [2021-11-25 18:28:04,668 INFO L78 Accepts]: Start accepts. Automaton has 22950 states and 37252 transitions. Word has length 142 [2021-11-25 18:28:04,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:28:04,668 INFO L470 AbstractCegarLoop]: Abstraction has 22950 states and 37252 transitions. [2021-11-25 18:28:04,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (23), 2 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-25 18:28:04,669 INFO L276 IsEmpty]: Start isEmpty. Operand 22950 states and 37252 transitions. [2021-11-25 18:28:04,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-25 18:28:04,675 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:28:04,675 INFO L514 BasicCegarLoop]: trace histogram [5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:28:04,698 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-25 18:28:04,875 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:28:04,876 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:28:04,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:28:04,876 INFO L85 PathProgramCache]: Analyzing trace with hash -2037759763, now seen corresponding path program 1 times [2021-11-25 18:28:04,876 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:28:04,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71514517] [2021-11-25 18:28:04,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:28:04,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:28:04,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:28:05,122 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-25 18:28:05,126 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:28:05,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [71514517] [2021-11-25 18:28:05,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [71514517] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:28:05,127 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:28:05,127 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 18:28:05,127 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104472361] [2021-11-25 18:28:05,128 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:28:05,128 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:28:05,129 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:28:05,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:28:05,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:28:05,129 INFO L87 Difference]: Start difference. First operand 22950 states and 37252 transitions. Second operand has 5 states, 5 states have (on average 17.4) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (23), 3 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-25 18:28:06,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:28:06,912 INFO L93 Difference]: Finished difference Result 44944 states and 74850 transitions. [2021-11-25 18:28:06,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:28:06,913 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 17.4) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (23), 3 states have call predecessors, (23), 2 states have call successors, (23) Word has length 146 [2021-11-25 18:28:06,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:28:07,178 INFO L225 Difference]: With dead ends: 44944 [2021-11-25 18:28:07,179 INFO L226 Difference]: Without dead ends: 23405 [2021-11-25 18:28:07,298 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:28:07,299 INFO L933 BasicCegarLoop]: 559 mSDtfsCounter, 13 mSDsluCounter, 1740 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 2201 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:28:07,299 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 2201 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:28:07,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23405 states. [2021-11-25 18:28:08,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23405 to 23124. [2021-11-25 18:28:08,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23124 states, 15609 states have (on average 1.4323146902428086) internal successors, (22357), 16980 states have internal predecessors, (22357), 5816 states have call successors, (5816), 1438 states have call predecessors, (5816), 1698 states have return successors, (9296), 5467 states have call predecessors, (9296), 5780 states have call successors, (9296) [2021-11-25 18:28:09,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23124 states to 23124 states and 37469 transitions. [2021-11-25 18:28:09,010 INFO L78 Accepts]: Start accepts. Automaton has 23124 states and 37469 transitions. Word has length 146 [2021-11-25 18:28:09,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:28:09,010 INFO L470 AbstractCegarLoop]: Abstraction has 23124 states and 37469 transitions. [2021-11-25 18:28:09,010 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 17.4) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (23), 3 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-25 18:28:09,010 INFO L276 IsEmpty]: Start isEmpty. Operand 23124 states and 37469 transitions. [2021-11-25 18:28:09,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-25 18:28:09,017 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:28:09,017 INFO L514 BasicCegarLoop]: trace histogram [7, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:28:09,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-25 18:28:09,017 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:28:09,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:28:09,018 INFO L85 PathProgramCache]: Analyzing trace with hash 1801064713, now seen corresponding path program 1 times [2021-11-25 18:28:09,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:28:09,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936534924] [2021-11-25 18:28:09,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:28:09,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:28:09,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:28:09,267 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 20 proven. 3 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-25 18:28:09,267 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:28:09,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936534924] [2021-11-25 18:28:09,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [936534924] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:28:09,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1446260316] [2021-11-25 18:28:09,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:28:09,268 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:28:09,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:28:09,269 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:28:09,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-25 18:28:09,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:28:09,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 1957 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 18:28:09,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:28:10,110 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 53 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 18:28:10,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:28:10,709 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 18:28:10,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1446260316] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:28:10,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2100970194] [2021-11-25 18:28:10,714 INFO L159 IcfgInterpreter]: Started Sifa with 98 locations of interest [2021-11-25 18:28:10,714 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:28:10,715 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:28:10,715 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:28:10,715 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:28:17,126 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 663 for LOIs [2021-11-25 18:28:24,463 INFO L197 IcfgInterpreter]: Interpreting procedure __automaton_fail with input of size 26 for LOIs [2021-11-25 18:28:24,475 INFO L197 IcfgInterpreter]: Interpreting procedure stopRequestedInDirection with input of size 39 for LOIs [2021-11-25 18:28:24,648 INFO L197 IcfgInterpreter]: Interpreting procedure isFloorCalling with input of size 61 for LOIs [2021-11-25 18:28:24,672 INFO L197 IcfgInterpreter]: Interpreting procedure buttonForFloorIsPressed with input of size 54 for LOIs [2021-11-25 18:28:24,696 INFO L197 IcfgInterpreter]: Interpreting procedure initTopDown with input of size 595 for LOIs [2021-11-25 18:28:26,610 INFO L197 IcfgInterpreter]: Interpreting procedure initFloors with input of size 569 for LOIs [2021-11-25 18:28:26,775 INFO L197 IcfgInterpreter]: Interpreting procedure continueInDirection with input of size 36 for LOIs [2021-11-25 18:28:26,850 INFO L197 IcfgInterpreter]: Interpreting procedure isTopFloor with input of size 54 for LOIs [2021-11-25 18:28:26,859 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentHeading with input of size 40 for LOIs [2021-11-25 18:28:26,868 INFO L197 IcfgInterpreter]: Interpreting procedure bobCall with input of size 569 for LOIs [2021-11-25 18:28:30,097 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 573 for LOIs [2021-11-25 18:28:30,622 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 501 for LOIs [2021-11-25 18:28:30,754 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:28:56,604 WARN L227 SmtUtils]: Spent 5.52s on a formula simplification. DAG size of input: 641 DAG size of output: 588 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:29:02,477 WARN L227 SmtUtils]: Spent 5.56s on a formula simplification. DAG size of input: 641 DAG size of output: 588 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:29:20,351 WARN L227 SmtUtils]: Spent 5.69s on a formula simplification. DAG size of input: 663 DAG size of output: 565 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:29:27,080 WARN L227 SmtUtils]: Spent 5.85s on a formula simplification. DAG size of input: 662 DAG size of output: 570 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:29:48,413 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1024487#(and (= ~currentHeading~0 0) (= ~head~0.offset 0) (<= ~floorButtons_0~0 2147483647) (= ~expectedDirection~0 1) (= ~head~0.base 0) (= |#NULL.offset| 0) (<= 0 (+ ~floorButtons_0~0 2147483648)) (<= 0 |#StackHeapBarrier|) (= ~cleanupTimeShifts~0 12) (= |#NULL.base| 0))' at error location [2021-11-25 18:29:48,413 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:29:48,413 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:29:48,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9, 10] total 29 [2021-11-25 18:29:48,414 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604086551] [2021-11-25 18:29:48,414 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:29:48,415 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 18:29:48,415 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:29:48,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 18:29:48,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=854, Invalid=10918, Unknown=0, NotChecked=0, Total=11772 [2021-11-25 18:29:48,420 INFO L87 Difference]: Start difference. First operand 23124 states and 37469 transitions. Second operand has 29 states, 21 states have (on average 8.523809523809524) internal successors, (179), 26 states have internal predecessors, (179), 15 states have call successors, (67), 9 states have call predecessors, (67), 15 states have return successors, (66), 16 states have call predecessors, (66), 15 states have call successors, (66) [2021-11-25 18:30:08,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:30:08,175 INFO L93 Difference]: Finished difference Result 64031 states and 112884 transitions. [2021-11-25 18:30:08,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-25 18:30:08,176 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 21 states have (on average 8.523809523809524) internal successors, (179), 26 states have internal predecessors, (179), 15 states have call successors, (67), 9 states have call predecessors, (67), 15 states have return successors, (66), 16 states have call predecessors, (66), 15 states have call successors, (66) Word has length 146 [2021-11-25 18:30:08,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:30:08,514 INFO L225 Difference]: With dead ends: 64031 [2021-11-25 18:30:08,514 INFO L226 Difference]: Without dead ends: 41924 [2021-11-25 18:30:08,796 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 582 GetRequests, 377 SyntacticMatches, 5 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16723 ImplicationChecksByTransitivity, 80.6s TimeCoverageRelationStatistics Valid=3338, Invalid=37264, Unknown=0, NotChecked=0, Total=40602 [2021-11-25 18:30:08,797 INFO L933 BasicCegarLoop]: 714 mSDtfsCounter, 8301 mSDsluCounter, 6663 mSDsCounter, 0 mSdLazyCounter, 18659 mSolverCounterSat, 6608 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8301 SdHoareTripleChecker+Valid, 6826 SdHoareTripleChecker+Invalid, 25267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 6608 IncrementalHoareTripleChecker+Valid, 18659 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:30:08,798 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8301 Valid, 6826 Invalid, 25267 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [6608 Valid, 18659 Invalid, 0 Unknown, 0 Unchecked, 13.0s Time] [2021-11-25 18:30:08,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41924 states. [2021-11-25 18:30:11,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41924 to 37239. [2021-11-25 18:30:11,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37239 states, 24982 states have (on average 1.4337122728364422) internal successors, (35817), 27162 states have internal predecessors, (35817), 9492 states have call successors, (9492), 2386 states have call predecessors, (9492), 2764 states have return successors, (16758), 8976 states have call predecessors, (16758), 9434 states have call successors, (16758) [2021-11-25 18:30:12,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37239 states to 37239 states and 62067 transitions. [2021-11-25 18:30:12,394 INFO L78 Accepts]: Start accepts. Automaton has 37239 states and 62067 transitions. Word has length 146 [2021-11-25 18:30:12,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:30:12,394 INFO L470 AbstractCegarLoop]: Abstraction has 37239 states and 62067 transitions. [2021-11-25 18:30:12,395 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 21 states have (on average 8.523809523809524) internal successors, (179), 26 states have internal predecessors, (179), 15 states have call successors, (67), 9 states have call predecessors, (67), 15 states have return successors, (66), 16 states have call predecessors, (66), 15 states have call successors, (66) [2021-11-25 18:30:12,395 INFO L276 IsEmpty]: Start isEmpty. Operand 37239 states and 62067 transitions. [2021-11-25 18:30:12,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-25 18:30:12,403 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:30:12,404 INFO L514 BasicCegarLoop]: trace histogram [5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:30:12,433 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-25 18:30:12,614 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-25 18:30:12,614 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:30:12,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:30:12,615 INFO L85 PathProgramCache]: Analyzing trace with hash 573989585, now seen corresponding path program 1 times [2021-11-25 18:30:12,615 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:30:12,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995033949] [2021-11-25 18:30:12,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:30:12,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:30:12,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:30:12,773 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-25 18:30:12,773 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:30:12,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [995033949] [2021-11-25 18:30:12,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [995033949] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:30:12,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1450684314] [2021-11-25 18:30:12,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:30:12,774 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:30:12,775 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:30:12,776 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:30:12,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f508bf-5bd6-4a9b-acd0-aae46c3022e4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 18:30:13,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:30:13,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 1735 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 18:30:13,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:30:13,545 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-25 18:30:13,545 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:30:13,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1450684314] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:30:13,546 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:30:13,546 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7] total 11 [2021-11-25 18:30:13,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464575455] [2021-11-25 18:30:13,547 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:30:13,547 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:30:13,547 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:30:13,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:30:13,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:30:13,548 INFO L87 Difference]: Start difference. First operand 37239 states and 62067 transitions. Second operand has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 5 states have internal predecessors, (100), 2 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-25 18:30:18,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:30:18,213 INFO L93 Difference]: Finished difference Result 73485 states and 126584 transitions. [2021-11-25 18:30:18,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 18:30:18,214 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 5 states have internal predecessors, (100), 2 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 2 states have call successors, (23) Word has length 156 [2021-11-25 18:30:18,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:30:18,529 INFO L225 Difference]: With dead ends: 73485 [2021-11-25 18:30:18,529 INFO L226 Difference]: Without dead ends: 37659 [2021-11-25 18:30:19,188 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-25 18:30:19,190 INFO L933 BasicCegarLoop]: 682 mSDtfsCounter, 466 mSDsluCounter, 2179 mSDsCounter, 0 mSdLazyCounter, 559 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 470 SdHoareTripleChecker+Valid, 2738 SdHoareTripleChecker+Invalid, 569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 559 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:30:19,190 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [470 Valid, 2738 Invalid, 569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 559 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 18:30:19,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37659 states.