./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.04.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.04.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 05d3b7d21cc48825b4a0189c75f03d768acc6241312029d3e223c1b9b2a509ea --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:21:59,051 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:21:59,053 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:21:59,094 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:21:59,095 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:21:59,097 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:21:59,099 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:21:59,102 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:21:59,105 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:21:59,107 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:21:59,108 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:21:59,110 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:21:59,111 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:21:59,113 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:21:59,115 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:21:59,117 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:21:59,118 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:21:59,120 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:21:59,123 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:21:59,126 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:21:59,128 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:21:59,130 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:21:59,132 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:21:59,134 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:21:59,138 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:21:59,139 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:21:59,140 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:21:59,141 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:21:59,142 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:21:59,143 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:21:59,144 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:21:59,145 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:21:59,146 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:21:59,148 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:21:59,149 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:21:59,149 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:21:59,150 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:21:59,151 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:21:59,151 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:21:59,152 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:21:59,153 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:21:59,154 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:21:59,190 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:21:59,191 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:21:59,191 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:21:59,191 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:21:59,192 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:21:59,192 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:21:59,193 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:21:59,193 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:21:59,200 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:21:59,200 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:21:59,202 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:21:59,202 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:21:59,202 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:21:59,203 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:21:59,203 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:21:59,203 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:21:59,203 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:21:59,204 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:21:59,205 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:21:59,206 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:21:59,206 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:21:59,206 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:21:59,207 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:21:59,207 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:21:59,208 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:21:59,208 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:21:59,210 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:21:59,210 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:21:59,210 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:21:59,211 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:21:59,211 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:21:59,211 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:21:59,212 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:21:59,212 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:21:59,212 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:21:59,213 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:21:59,213 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:21:59,213 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:21:59,214 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:21:59,214 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:21:59,214 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:21:59,214 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_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 05d3b7d21cc48825b4a0189c75f03d768acc6241312029d3e223c1b9b2a509ea [2021-11-23 03:21:59,572 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:21:59,601 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:21:59,605 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:21:59,606 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:21:59,607 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:21:59,609 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/systemc/token_ring.04.cil-2.c [2021-11-23 03:21:59,705 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/data/031cee61d/2f434694fb6e4abfb8e7f50b7616dfe0/FLAGf90ca00d1 [2021-11-23 03:22:00,300 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:22:00,301 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/sv-benchmarks/c/systemc/token_ring.04.cil-2.c [2021-11-23 03:22:00,314 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/data/031cee61d/2f434694fb6e4abfb8e7f50b7616dfe0/FLAGf90ca00d1 [2021-11-23 03:22:00,636 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/data/031cee61d/2f434694fb6e4abfb8e7f50b7616dfe0 [2021-11-23 03:22:00,640 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:22:00,644 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:22:00,651 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:22:00,651 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:22:00,656 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:22:00,657 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:22:00" (1/1) ... [2021-11-23 03:22:00,660 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@82629b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:00, skipping insertion in model container [2021-11-23 03:22:00,661 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:22:00" (1/1) ... [2021-11-23 03:22:00,671 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:22:00,720 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:22:00,950 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_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/sv-benchmarks/c/systemc/token_ring.04.cil-2.c[671,684] [2021-11-23 03:22:01,046 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:22:01,057 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:22:01,072 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_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/sv-benchmarks/c/systemc/token_ring.04.cil-2.c[671,684] [2021-11-23 03:22:01,121 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:22:01,142 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:22:01,143 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:01 WrapperNode [2021-11-23 03:22:01,143 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:22:01,145 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:22:01,145 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:22:01,145 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:22:01,158 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:01" (1/1) ... [2021-11-23 03:22:01,185 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:01" (1/1) ... [2021-11-23 03:22:01,250 INFO L137 Inliner]: procedures = 36, calls = 44, calls flagged for inlining = 19, calls inlined = 19, statements flattened = 394 [2021-11-23 03:22:01,251 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:22:01,251 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:22:01,252 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:22:01,252 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:22:01,266 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:01" (1/1) ... [2021-11-23 03:22:01,267 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:01" (1/1) ... [2021-11-23 03:22:01,281 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:01" (1/1) ... [2021-11-23 03:22:01,282 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:01" (1/1) ... [2021-11-23 03:22:01,292 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:01" (1/1) ... [2021-11-23 03:22:01,318 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:01" (1/1) ... [2021-11-23 03:22:01,339 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:01" (1/1) ... [2021-11-23 03:22:01,349 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:22:01,356 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:22:01,356 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:22:01,356 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:22:01,358 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:01" (1/1) ... [2021-11-23 03:22:01,367 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:22:01,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:01,403 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:22:01,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:22:01,469 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:22:01,471 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-23 03:22:01,471 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-23 03:22:01,471 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-23 03:22:01,471 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-23 03:22:01,472 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-23 03:22:01,472 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-23 03:22:01,472 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-23 03:22:01,472 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-23 03:22:01,472 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-23 03:22:01,473 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-23 03:22:01,473 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-23 03:22:01,473 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-23 03:22:01,473 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:22:01,474 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-23 03:22:01,474 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-23 03:22:01,474 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:22:01,474 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:22:01,576 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:22:01,578 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:22:02,289 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:22:02,492 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:22:02,492 INFO L301 CfgBuilder]: Removed 7 assume(true) statements. [2021-11-23 03:22:02,495 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:22:02 BoogieIcfgContainer [2021-11-23 03:22:02,496 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:22:02,498 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:22:02,498 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:22:02,502 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:22:02,502 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:22:00" (1/3) ... [2021-11-23 03:22:02,503 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@430a9946 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:22:02, skipping insertion in model container [2021-11-23 03:22:02,503 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:01" (2/3) ... [2021-11-23 03:22:02,504 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@430a9946 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:22:02, skipping insertion in model container [2021-11-23 03:22:02,504 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:22:02" (3/3) ... [2021-11-23 03:22:02,505 INFO L111 eAbstractionObserver]: Analyzing ICFG token_ring.04.cil-2.c [2021-11-23 03:22:02,512 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:22:02,512 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:22:02,571 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:22:02,579 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 03:22:02,580 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:22:02,609 INFO L276 IsEmpty]: Start isEmpty. Operand has 106 states, 77 states have (on average 1.5324675324675325) internal successors, (118), 81 states have internal predecessors, (118), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-23 03:22:02,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 03:22:02,618 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:02,619 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:02,619 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:02,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:02,625 INFO L85 PathProgramCache]: Analyzing trace with hash 442892344, now seen corresponding path program 1 times [2021-11-23 03:22:02,635 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:02,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011601852] [2021-11-23 03:22:02,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:02,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:02,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:02,973 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:22:02,973 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:02,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011601852] [2021-11-23 03:22:02,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1011601852] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:02,974 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:22:02,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:22:02,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181218004] [2021-11-23 03:22:02,977 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:02,981 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:22:02,981 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:03,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:22:03,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:22:03,013 INFO L87 Difference]: Start difference. First operand has 106 states, 77 states have (on average 1.5324675324675325) internal successors, (118), 81 states have internal predecessors, (118), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) Second operand has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 states have internal predecessors, (32), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 03:22:03,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:03,408 INFO L93 Difference]: Finished difference Result 295 states and 448 transitions. [2021-11-23 03:22:03,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:22:03,411 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 states have internal predecessors, (32), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 43 [2021-11-23 03:22:03,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:03,430 INFO L225 Difference]: With dead ends: 295 [2021-11-23 03:22:03,430 INFO L226 Difference]: Without dead ends: 190 [2021-11-23 03:22:03,446 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:22:03,455 INFO L933 BasicCegarLoop]: 221 mSDtfsCounter, 256 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 374 SdHoareTripleChecker+Invalid, 191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:03,457 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [256 Valid, 374 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:22:03,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-11-23 03:22:03,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 189. [2021-11-23 03:22:03,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 142 states have (on average 1.4507042253521127) internal successors, (206), 145 states have internal predecessors, (206), 34 states have call successors, (34), 13 states have call predecessors, (34), 12 states have return successors, (32), 31 states have call predecessors, (32), 32 states have call successors, (32) [2021-11-23 03:22:03,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 272 transitions. [2021-11-23 03:22:03,566 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 272 transitions. Word has length 43 [2021-11-23 03:22:03,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:03,566 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 272 transitions. [2021-11-23 03:22:03,567 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 states have internal predecessors, (32), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 03:22:03,567 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 272 transitions. [2021-11-23 03:22:03,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 03:22:03,574 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:03,574 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:22:03,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:22:03,575 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:03,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:03,576 INFO L85 PathProgramCache]: Analyzing trace with hash -1615707175, now seen corresponding path program 1 times [2021-11-23 03:22:03,576 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:03,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1571623253] [2021-11-23 03:22:03,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:03,577 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:03,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:03,759 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 03:22:03,760 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:03,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1571623253] [2021-11-23 03:22:03,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1571623253] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:03,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1359795302] [2021-11-23 03:22:03,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:03,762 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:03,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:03,771 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:03,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:22:03,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:03,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:22:03,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:04,357 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 03:22:04,357 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:04,358 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1359795302] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:04,358 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:04,358 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:22:04,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555082454] [2021-11-23 03:22:04,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:04,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:04,362 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:04,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:04,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:22:04,363 INFO L87 Difference]: Start difference. First operand 189 states and 272 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 2 states have internal predecessors, (52), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:22:04,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:04,535 INFO L93 Difference]: Finished difference Result 550 states and 803 transitions. [2021-11-23 03:22:04,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:04,536 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 2 states have internal predecessors, (52), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 80 [2021-11-23 03:22:04,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:04,550 INFO L225 Difference]: With dead ends: 550 [2021-11-23 03:22:04,551 INFO L226 Difference]: Without dead ends: 366 [2021-11-23 03:22:04,554 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:22:04,557 INFO L933 BasicCegarLoop]: 166 mSDtfsCounter, 123 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:04,558 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 279 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:22:04,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2021-11-23 03:22:04,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 360. [2021-11-23 03:22:04,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 275 states have (on average 1.4436363636363636) internal successors, (397), 279 states have internal predecessors, (397), 60 states have call successors, (60), 25 states have call predecessors, (60), 24 states have return successors, (58), 56 states have call predecessors, (58), 58 states have call successors, (58) [2021-11-23 03:22:04,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 515 transitions. [2021-11-23 03:22:04,655 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 515 transitions. Word has length 80 [2021-11-23 03:22:04,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:04,656 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 515 transitions. [2021-11-23 03:22:04,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 2 states have internal predecessors, (52), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:22:04,656 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 515 transitions. [2021-11-23 03:22:04,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 03:22:04,671 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:04,672 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:22:04,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:04,886 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:04,887 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:04,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:04,888 INFO L85 PathProgramCache]: Analyzing trace with hash -895614023, now seen corresponding path program 1 times [2021-11-23 03:22:04,888 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:04,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801904214] [2021-11-23 03:22:04,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:04,889 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:04,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:05,061 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 03:22:05,061 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:05,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801904214] [2021-11-23 03:22:05,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1801904214] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:05,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1924201767] [2021-11-23 03:22:05,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:05,066 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:05,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:05,070 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:05,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:22:05,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:05,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 451 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:22:05,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:05,420 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 03:22:05,421 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:05,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1924201767] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:05,421 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:05,421 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:22:05,422 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841218051] [2021-11-23 03:22:05,422 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:05,422 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:05,423 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:05,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:05,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:22:05,424 INFO L87 Difference]: Start difference. First operand 360 states and 515 transitions. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 2 states have internal predecessors, (49), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:22:05,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:05,613 INFO L93 Difference]: Finished difference Result 1057 states and 1534 transitions. [2021-11-23 03:22:05,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:05,620 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 2 states have internal predecessors, (49), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 80 [2021-11-23 03:22:05,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:05,627 INFO L225 Difference]: With dead ends: 1057 [2021-11-23 03:22:05,627 INFO L226 Difference]: Without dead ends: 702 [2021-11-23 03:22:05,629 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:22:05,630 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 126 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:05,631 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 248 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:22:05,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 702 states. [2021-11-23 03:22:05,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 702 to 694. [2021-11-23 03:22:05,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 694 states, 535 states have (on average 1.4336448598130842) internal successors, (767), 541 states have internal predecessors, (767), 110 states have call successors, (110), 49 states have call predecessors, (110), 48 states have return successors, (108), 104 states have call predecessors, (108), 108 states have call successors, (108) [2021-11-23 03:22:05,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 694 states to 694 states and 985 transitions. [2021-11-23 03:22:05,713 INFO L78 Accepts]: Start accepts. Automaton has 694 states and 985 transitions. Word has length 80 [2021-11-23 03:22:05,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:05,713 INFO L470 AbstractCegarLoop]: Abstraction has 694 states and 985 transitions. [2021-11-23 03:22:05,713 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 2 states have internal predecessors, (49), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:22:05,714 INFO L276 IsEmpty]: Start isEmpty. Operand 694 states and 985 transitions. [2021-11-23 03:22:05,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 03:22:05,725 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:05,725 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:22:05,754 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:05,933 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:05,934 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:05,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:05,935 INFO L85 PathProgramCache]: Analyzing trace with hash -1962166311, now seen corresponding path program 1 times [2021-11-23 03:22:05,935 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:05,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199183705] [2021-11-23 03:22:05,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:05,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:05,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:06,084 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 03:22:06,084 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:06,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199183705] [2021-11-23 03:22:06,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [199183705] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:06,089 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:22:06,089 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 03:22:06,090 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155754428] [2021-11-23 03:22:06,090 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:06,091 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:22:06,091 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:06,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:22:06,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:22:06,092 INFO L87 Difference]: Start difference. First operand 694 states and 985 transitions. Second operand has 6 states, 6 states have (on average 7.666666666666667) internal successors, (46), 6 states have internal predecessors, (46), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 03:22:06,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:06,633 INFO L93 Difference]: Finished difference Result 2246 states and 3200 transitions. [2021-11-23 03:22:06,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 03:22:06,634 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.666666666666667) internal successors, (46), 6 states have internal predecessors, (46), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 80 [2021-11-23 03:22:06,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:06,651 INFO L225 Difference]: With dead ends: 2246 [2021-11-23 03:22:06,652 INFO L226 Difference]: Without dead ends: 1558 [2021-11-23 03:22:06,655 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:22:06,657 INFO L933 BasicCegarLoop]: 149 mSDtfsCounter, 418 mSDsluCounter, 343 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 431 SdHoareTripleChecker+Valid, 435 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:06,657 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [431 Valid, 435 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:22:06,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1558 states. [2021-11-23 03:22:06,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1558 to 1330. [2021-11-23 03:22:06,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1330 states, 1027 states have (on average 1.4206426484907497) internal successors, (1459), 1037 states have internal predecessors, (1459), 206 states have call successors, (206), 97 states have call predecessors, (206), 96 states have return successors, (204), 196 states have call predecessors, (204), 204 states have call successors, (204) [2021-11-23 03:22:06,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1330 states to 1330 states and 1869 transitions. [2021-11-23 03:22:06,783 INFO L78 Accepts]: Start accepts. Automaton has 1330 states and 1869 transitions. Word has length 80 [2021-11-23 03:22:06,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:06,784 INFO L470 AbstractCegarLoop]: Abstraction has 1330 states and 1869 transitions. [2021-11-23 03:22:06,785 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.666666666666667) internal successors, (46), 6 states have internal predecessors, (46), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 03:22:06,785 INFO L276 IsEmpty]: Start isEmpty. Operand 1330 states and 1869 transitions. [2021-11-23 03:22:06,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 03:22:06,791 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:06,791 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:06,791 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 03:22:06,792 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:06,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:06,793 INFO L85 PathProgramCache]: Analyzing trace with hash 2145059053, now seen corresponding path program 1 times [2021-11-23 03:22:06,793 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:06,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [885766074] [2021-11-23 03:22:06,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:06,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:06,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:06,930 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 10 proven. 17 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 03:22:06,931 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:06,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [885766074] [2021-11-23 03:22:06,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [885766074] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:06,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [418643659] [2021-11-23 03:22:06,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:06,934 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:06,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:06,941 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:06,951 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:22:07,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:07,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:22:07,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:07,261 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 03:22:07,261 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:07,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [418643659] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:07,261 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:07,262 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:22:07,262 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790267004] [2021-11-23 03:22:07,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:07,263 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:07,263 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:07,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:07,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:22:07,264 INFO L87 Difference]: Start difference. First operand 1330 states and 1869 transitions. Second operand has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:22:07,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:07,440 INFO L93 Difference]: Finished difference Result 2354 states and 3356 transitions. [2021-11-23 03:22:07,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:07,440 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 94 [2021-11-23 03:22:07,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:07,456 INFO L225 Difference]: With dead ends: 2354 [2021-11-23 03:22:07,456 INFO L226 Difference]: Without dead ends: 1662 [2021-11-23 03:22:07,459 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:22:07,460 INFO L933 BasicCegarLoop]: 182 mSDtfsCounter, 54 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:07,461 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 309 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:22:07,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1662 states. [2021-11-23 03:22:07,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1662 to 1522. [2021-11-23 03:22:07,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1522 states, 1203 states have (on average 1.4522028262676643) internal successors, (1747), 1213 states have internal predecessors, (1747), 214 states have call successors, (214), 105 states have call predecessors, (214), 104 states have return successors, (212), 204 states have call predecessors, (212), 212 states have call successors, (212) [2021-11-23 03:22:07,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1522 states to 1522 states and 2173 transitions. [2021-11-23 03:22:07,592 INFO L78 Accepts]: Start accepts. Automaton has 1522 states and 2173 transitions. Word has length 94 [2021-11-23 03:22:07,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:07,593 INFO L470 AbstractCegarLoop]: Abstraction has 1522 states and 2173 transitions. [2021-11-23 03:22:07,593 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:22:07,593 INFO L276 IsEmpty]: Start isEmpty. Operand 1522 states and 2173 transitions. [2021-11-23 03:22:07,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-23 03:22:07,601 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:07,601 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:07,641 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:07,822 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:07,822 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:07,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:07,823 INFO L85 PathProgramCache]: Analyzing trace with hash 411509574, now seen corresponding path program 1 times [2021-11-23 03:22:07,823 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:07,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [599178664] [2021-11-23 03:22:07,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:07,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:07,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:07,961 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 10 proven. 33 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 03:22:07,962 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:07,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [599178664] [2021-11-23 03:22:07,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [599178664] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:07,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [413114530] [2021-11-23 03:22:07,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:07,963 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:07,963 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:07,964 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:07,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:22:08,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:08,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 598 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:22:08,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:08,417 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 03:22:08,417 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:08,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [413114530] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:08,417 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:08,418 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2021-11-23 03:22:08,418 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941689208] [2021-11-23 03:22:08,418 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:08,419 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:08,420 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:08,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:08,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:22:08,421 INFO L87 Difference]: Start difference. First operand 1522 states and 2173 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-23 03:22:08,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:08,715 INFO L93 Difference]: Finished difference Result 4507 states and 6510 transitions. [2021-11-23 03:22:08,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:08,716 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 120 [2021-11-23 03:22:08,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:08,743 INFO L225 Difference]: With dead ends: 4507 [2021-11-23 03:22:08,744 INFO L226 Difference]: Without dead ends: 2990 [2021-11-23 03:22:08,753 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:22:08,755 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 83 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:08,755 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 248 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:22:08,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2990 states. [2021-11-23 03:22:08,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2990 to 2962. [2021-11-23 03:22:08,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2962 states, 2347 states have (on average 1.43971026842778) internal successors, (3379), 2365 states have internal predecessors, (3379), 406 states have call successors, (406), 209 states have call predecessors, (406), 208 states have return successors, (404), 388 states have call predecessors, (404), 404 states have call successors, (404) [2021-11-23 03:22:09,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2962 states to 2962 states and 4189 transitions. [2021-11-23 03:22:09,010 INFO L78 Accepts]: Start accepts. Automaton has 2962 states and 4189 transitions. Word has length 120 [2021-11-23 03:22:09,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:09,010 INFO L470 AbstractCegarLoop]: Abstraction has 2962 states and 4189 transitions. [2021-11-23 03:22:09,011 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-23 03:22:09,011 INFO L276 IsEmpty]: Start isEmpty. Operand 2962 states and 4189 transitions. [2021-11-23 03:22:09,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-23 03:22:09,024 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:09,024 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 03:22:09,067 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-23 03:22:09,237 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:09,238 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:09,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:09,238 INFO L85 PathProgramCache]: Analyzing trace with hash 655965401, now seen corresponding path program 1 times [2021-11-23 03:22:09,238 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:09,238 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1569770900] [2021-11-23 03:22:09,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:09,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:09,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:09,297 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-23 03:22:09,297 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:09,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1569770900] [2021-11-23 03:22:09,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1569770900] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:09,298 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:22:09,298 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:22:09,298 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723358925] [2021-11-23 03:22:09,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:09,299 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:09,299 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:09,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:09,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:22:09,300 INFO L87 Difference]: Start difference. First operand 2962 states and 4189 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:22:09,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:09,685 INFO L93 Difference]: Finished difference Result 7391 states and 10518 transitions. [2021-11-23 03:22:09,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:09,686 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 106 [2021-11-23 03:22:09,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:09,724 INFO L225 Difference]: With dead ends: 7391 [2021-11-23 03:22:09,724 INFO L226 Difference]: Without dead ends: 4434 [2021-11-23 03:22:09,736 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:22:09,737 INFO L933 BasicCegarLoop]: 165 mSDtfsCounter, 119 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:09,738 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [119 Valid, 278 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:22:09,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4434 states. [2021-11-23 03:22:10,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4434 to 4406. [2021-11-23 03:22:10,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4406 states, 3495 states have (on average 1.42689556509299) internal successors, (4987), 3521 states have internal predecessors, (4987), 598 states have call successors, (598), 313 states have call predecessors, (598), 312 states have return successors, (596), 572 states have call predecessors, (596), 596 states have call successors, (596) [2021-11-23 03:22:10,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4406 states to 4406 states and 6181 transitions. [2021-11-23 03:22:10,161 INFO L78 Accepts]: Start accepts. Automaton has 4406 states and 6181 transitions. Word has length 106 [2021-11-23 03:22:10,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:10,163 INFO L470 AbstractCegarLoop]: Abstraction has 4406 states and 6181 transitions. [2021-11-23 03:22:10,164 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:22:10,164 INFO L276 IsEmpty]: Start isEmpty. Operand 4406 states and 6181 transitions. [2021-11-23 03:22:10,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-23 03:22:10,185 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:10,186 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 03:22:10,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 03:22:10,186 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:10,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:10,187 INFO L85 PathProgramCache]: Analyzing trace with hash 462187476, now seen corresponding path program 1 times [2021-11-23 03:22:10,187 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:10,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [38893956] [2021-11-23 03:22:10,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:10,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:10,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:10,306 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 10 proven. 33 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 03:22:10,306 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:10,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [38893956] [2021-11-23 03:22:10,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [38893956] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:10,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1580742714] [2021-11-23 03:22:10,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:10,307 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:10,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:10,310 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:10,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:22:10,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:10,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 612 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:22:10,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:10,669 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 03:22:10,669 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:10,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1580742714] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:10,670 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:10,670 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:22:10,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443720794] [2021-11-23 03:22:10,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:10,671 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:10,671 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:10,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:10,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:22:10,672 INFO L87 Difference]: Start difference. First operand 4406 states and 6181 transitions. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:22:10,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:10,961 INFO L93 Difference]: Finished difference Result 7382 states and 10571 transitions. [2021-11-23 03:22:10,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:10,961 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 123 [2021-11-23 03:22:10,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:10,998 INFO L225 Difference]: With dead ends: 7382 [2021-11-23 03:22:10,999 INFO L226 Difference]: Without dead ends: 4426 [2021-11-23 03:22:11,011 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:22:11,012 INFO L933 BasicCegarLoop]: 202 mSDtfsCounter, 114 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:11,013 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 317 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:22:11,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4426 states. [2021-11-23 03:22:11,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4426 to 4390. [2021-11-23 03:22:11,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4390 states, 3479 states have (on average 1.4058637539522851) internal successors, (4891), 3505 states have internal predecessors, (4891), 598 states have call successors, (598), 313 states have call predecessors, (598), 312 states have return successors, (596), 572 states have call predecessors, (596), 596 states have call successors, (596) [2021-11-23 03:22:11,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4390 states to 4390 states and 6085 transitions. [2021-11-23 03:22:11,348 INFO L78 Accepts]: Start accepts. Automaton has 4390 states and 6085 transitions. Word has length 123 [2021-11-23 03:22:11,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:11,348 INFO L470 AbstractCegarLoop]: Abstraction has 4390 states and 6085 transitions. [2021-11-23 03:22:11,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:22:11,349 INFO L276 IsEmpty]: Start isEmpty. Operand 4390 states and 6085 transitions. [2021-11-23 03:22:11,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-23 03:22:11,365 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:11,365 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 03:22:11,403 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:11,593 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-23 03:22:11,594 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:11,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:11,594 INFO L85 PathProgramCache]: Analyzing trace with hash -1869151402, now seen corresponding path program 1 times [2021-11-23 03:22:11,594 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:11,594 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068101290] [2021-11-23 03:22:11,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:11,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:11,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:11,665 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 03:22:11,665 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:11,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1068101290] [2021-11-23 03:22:11,666 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1068101290] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:11,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752851184] [2021-11-23 03:22:11,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:11,666 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:11,667 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:11,667 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:11,674 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:22:11,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:11,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 618 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:22:11,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:12,023 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 57 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 03:22:12,024 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:12,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1752851184] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:12,024 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:12,024 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:22:12,025 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387291494] [2021-11-23 03:22:12,025 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:12,026 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:12,026 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:12,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:12,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:22:12,027 INFO L87 Difference]: Start difference. First operand 4390 states and 6085 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:22:12,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:12,409 INFO L93 Difference]: Finished difference Result 8398 states and 11570 transitions. [2021-11-23 03:22:12,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:12,410 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), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 123 [2021-11-23 03:22:12,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:12,455 INFO L225 Difference]: With dead ends: 8398 [2021-11-23 03:22:12,455 INFO L226 Difference]: Without dead ends: 5466 [2021-11-23 03:22:12,470 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:22:12,471 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 125 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:12,472 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 167 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:22:12,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5466 states. [2021-11-23 03:22:12,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5466 to 5466. [2021-11-23 03:22:12,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5466 states, 4419 states have (on average 1.3629780493324282) internal successors, (6023), 4445 states have internal predecessors, (6023), 642 states have call successors, (642), 405 states have call predecessors, (642), 404 states have return successors, (640), 616 states have call predecessors, (640), 640 states have call successors, (640) [2021-11-23 03:22:12,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5466 states to 5466 states and 7305 transitions. [2021-11-23 03:22:12,884 INFO L78 Accepts]: Start accepts. Automaton has 5466 states and 7305 transitions. Word has length 123 [2021-11-23 03:22:12,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:12,885 INFO L470 AbstractCegarLoop]: Abstraction has 5466 states and 7305 transitions. [2021-11-23 03:22:12,886 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), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:22:12,886 INFO L276 IsEmpty]: Start isEmpty. Operand 5466 states and 7305 transitions. [2021-11-23 03:22:12,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 03:22:12,905 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:12,906 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 03:22:12,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:13,129 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:13,129 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:13,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:13,130 INFO L85 PathProgramCache]: Analyzing trace with hash -716427031, now seen corresponding path program 1 times [2021-11-23 03:22:13,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:13,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [606309952] [2021-11-23 03:22:13,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:13,130 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:13,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:13,228 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 10 proven. 32 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 03:22:13,228 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:13,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [606309952] [2021-11-23 03:22:13,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [606309952] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:13,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [757374013] [2021-11-23 03:22:13,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:13,229 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:13,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:13,234 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:13,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:22:13,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:13,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 617 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:22:13,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:13,580 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 76 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:22:13,581 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:13,581 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [757374013] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:13,581 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:13,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:22:13,581 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176161965] [2021-11-23 03:22:13,582 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:13,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:13,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:13,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:13,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:22:13,583 INFO L87 Difference]: Start difference. First operand 5466 states and 7305 transitions. Second operand has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:22:13,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:13,947 INFO L93 Difference]: Finished difference Result 8298 states and 11307 transitions. [2021-11-23 03:22:13,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:13,948 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 124 [2021-11-23 03:22:13,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:13,999 INFO L225 Difference]: With dead ends: 8298 [2021-11-23 03:22:13,999 INFO L226 Difference]: Without dead ends: 5494 [2021-11-23 03:22:14,010 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:22:14,011 INFO L933 BasicCegarLoop]: 220 mSDtfsCounter, 110 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 335 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:14,012 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 335 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:22:14,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5494 states. [2021-11-23 03:22:14,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5494 to 5442. [2021-11-23 03:22:14,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5442 states, 4395 states have (on average 1.3376564277588168) internal successors, (5879), 4421 states have internal predecessors, (5879), 642 states have call successors, (642), 405 states have call predecessors, (642), 404 states have return successors, (640), 616 states have call predecessors, (640), 640 states have call successors, (640) [2021-11-23 03:22:14,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5442 states to 5442 states and 7161 transitions. [2021-11-23 03:22:14,384 INFO L78 Accepts]: Start accepts. Automaton has 5442 states and 7161 transitions. Word has length 124 [2021-11-23 03:22:14,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:14,385 INFO L470 AbstractCegarLoop]: Abstraction has 5442 states and 7161 transitions. [2021-11-23 03:22:14,385 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:22:14,385 INFO L276 IsEmpty]: Start isEmpty. Operand 5442 states and 7161 transitions. [2021-11-23 03:22:14,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 03:22:14,404 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:14,404 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:14,441 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:14,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:14,619 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:14,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:14,620 INFO L85 PathProgramCache]: Analyzing trace with hash 958630153, now seen corresponding path program 1 times [2021-11-23 03:22:14,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:14,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2020771549] [2021-11-23 03:22:14,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:14,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:14,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:14,688 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 10 proven. 30 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 03:22:14,689 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:14,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2020771549] [2021-11-23 03:22:14,689 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2020771549] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:14,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1122165653] [2021-11-23 03:22:14,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:14,690 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:14,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:14,691 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:14,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 03:22:14,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:14,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:22:14,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:15,157 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:22:15,158 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:15,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1122165653] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:15,158 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:15,158 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-23 03:22:15,159 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095512877] [2021-11-23 03:22:15,159 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:15,160 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:22:15,160 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:15,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:22:15,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:22:15,161 INFO L87 Difference]: Start difference. First operand 5442 states and 7161 transitions. Second operand has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-23 03:22:15,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:15,697 INFO L93 Difference]: Finished difference Result 8034 states and 10583 transitions. [2021-11-23 03:22:15,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:22:15,698 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 124 [2021-11-23 03:22:15,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:15,731 INFO L225 Difference]: With dead ends: 8034 [2021-11-23 03:22:15,731 INFO L226 Difference]: Without dead ends: 5977 [2021-11-23 03:22:15,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:22:15,742 INFO L933 BasicCegarLoop]: 207 mSDtfsCounter, 135 mSDsluCounter, 356 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 514 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:15,743 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 514 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:22:15,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5977 states. [2021-11-23 03:22:16,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5977 to 5719. [2021-11-23 03:22:16,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5719 states, 4627 states have (on average 1.3298033282904689) internal successors, (6153), 4669 states have internal predecessors, (6153), 650 states have call successors, (650), 410 states have call predecessors, (650), 441 states have return successors, (680), 640 states have call predecessors, (680), 648 states have call successors, (680) [2021-11-23 03:22:16,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5719 states to 5719 states and 7483 transitions. [2021-11-23 03:22:16,228 INFO L78 Accepts]: Start accepts. Automaton has 5719 states and 7483 transitions. Word has length 124 [2021-11-23 03:22:16,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:16,229 INFO L470 AbstractCegarLoop]: Abstraction has 5719 states and 7483 transitions. [2021-11-23 03:22:16,229 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-23 03:22:16,229 INFO L276 IsEmpty]: Start isEmpty. Operand 5719 states and 7483 transitions. [2021-11-23 03:22:16,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 03:22:16,251 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:16,252 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:16,298 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:16,467 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:16,467 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:16,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:16,467 INFO L85 PathProgramCache]: Analyzing trace with hash 90400317, now seen corresponding path program 1 times [2021-11-23 03:22:16,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:16,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1458089977] [2021-11-23 03:22:16,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:16,468 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:16,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:16,536 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 20 proven. 4 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 03:22:16,537 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:16,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1458089977] [2021-11-23 03:22:16,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1458089977] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:16,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [362893327] [2021-11-23 03:22:16,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:16,538 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:16,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:16,539 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:16,565 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 03:22:16,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:16,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 617 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:22:16,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:16,910 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 03:22:16,911 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:16,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [362893327] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:16,911 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:16,912 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 03:22:16,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271775293] [2021-11-23 03:22:16,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:16,913 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:16,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:16,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:16,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:22:16,914 INFO L87 Difference]: Start difference. First operand 5719 states and 7483 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:22:17,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:17,424 INFO L93 Difference]: Finished difference Result 10799 states and 14313 transitions. [2021-11-23 03:22:17,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:17,425 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 124 [2021-11-23 03:22:17,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:17,468 INFO L225 Difference]: With dead ends: 10799 [2021-11-23 03:22:17,468 INFO L226 Difference]: Without dead ends: 7911 [2021-11-23 03:22:17,479 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:22:17,479 INFO L933 BasicCegarLoop]: 199 mSDtfsCounter, 87 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 327 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:17,480 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 327 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:22:17,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7911 states. [2021-11-23 03:22:17,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7911 to 6439. [2021-11-23 03:22:17,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6439 states, 5275 states have (on average 1.3598104265402844) internal successors, (7173), 5317 states have internal predecessors, (7173), 686 states have call successors, (686), 446 states have call predecessors, (686), 477 states have return successors, (716), 676 states have call predecessors, (716), 684 states have call successors, (716) [2021-11-23 03:22:17,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6439 states to 6439 states and 8575 transitions. [2021-11-23 03:22:17,941 INFO L78 Accepts]: Start accepts. Automaton has 6439 states and 8575 transitions. Word has length 124 [2021-11-23 03:22:17,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:17,942 INFO L470 AbstractCegarLoop]: Abstraction has 6439 states and 8575 transitions. [2021-11-23 03:22:17,943 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:22:17,943 INFO L276 IsEmpty]: Start isEmpty. Operand 6439 states and 8575 transitions. [2021-11-23 03:22:17,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-23 03:22:17,999 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:18,000 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:18,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:18,225 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 03:22:18,226 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:18,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:18,226 INFO L85 PathProgramCache]: Analyzing trace with hash 461396072, now seen corresponding path program 2 times [2021-11-23 03:22:18,227 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:18,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1990279123] [2021-11-23 03:22:18,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:18,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:18,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:18,310 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 03:22:18,311 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:18,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1990279123] [2021-11-23 03:22:18,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1990279123] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:18,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [178937436] [2021-11-23 03:22:18,312 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:22:18,312 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:18,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:18,313 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:18,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 03:22:18,476 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 03:22:18,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:22:18,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 575 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:22:18,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:18,684 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 03:22:18,684 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:18,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [178937436] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:18,684 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:18,685 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:22:18,685 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584020199] [2021-11-23 03:22:18,685 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:18,686 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:18,686 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:18,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:18,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:22:18,687 INFO L87 Difference]: Start difference. First operand 6439 states and 8575 transitions. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:22:18,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:18,993 INFO L93 Difference]: Finished difference Result 8884 states and 11967 transitions. [2021-11-23 03:22:18,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:18,994 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 125 [2021-11-23 03:22:18,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:19,020 INFO L225 Difference]: With dead ends: 8884 [2021-11-23 03:22:19,020 INFO L226 Difference]: Without dead ends: 6159 [2021-11-23 03:22:19,030 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:22:19,031 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 28 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:19,032 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 259 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:22:19,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6159 states. [2021-11-23 03:22:19,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6159 to 5711. [2021-11-23 03:22:19,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5711 states, 4643 states have (on average 1.3708808959724317) internal successors, (6365), 4661 states have internal predecessors, (6365), 654 states have call successors, (654), 414 states have call predecessors, (654), 413 states have return successors, (652), 636 states have call predecessors, (652), 652 states have call successors, (652) [2021-11-23 03:22:19,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5711 states to 5711 states and 7671 transitions. [2021-11-23 03:22:19,477 INFO L78 Accepts]: Start accepts. Automaton has 5711 states and 7671 transitions. Word has length 125 [2021-11-23 03:22:19,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:19,477 INFO L470 AbstractCegarLoop]: Abstraction has 5711 states and 7671 transitions. [2021-11-23 03:22:19,478 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:22:19,478 INFO L276 IsEmpty]: Start isEmpty. Operand 5711 states and 7671 transitions. [2021-11-23 03:22:19,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-23 03:22:19,513 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:19,513 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:19,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:19,737 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 03:22:19,738 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:19,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:19,738 INFO L85 PathProgramCache]: Analyzing trace with hash -1137152252, now seen corresponding path program 1 times [2021-11-23 03:22:19,738 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:19,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058301494] [2021-11-23 03:22:19,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:19,739 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:19,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:19,822 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 03:22:19,822 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:19,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1058301494] [2021-11-23 03:22:19,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1058301494] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:19,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1701261833] [2021-11-23 03:22:19,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:19,824 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:19,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:19,829 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:19,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 03:22:20,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:20,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 627 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:22:20,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:20,257 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 03:22:20,258 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:20,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1701261833] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:20,258 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:20,259 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:22:20,259 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115922909] [2021-11-23 03:22:20,259 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:20,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:20,260 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:20,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:20,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:22:20,261 INFO L87 Difference]: Start difference. First operand 5711 states and 7671 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:22:20,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:20,877 INFO L93 Difference]: Finished difference Result 13743 states and 18722 transitions. [2021-11-23 03:22:20,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:20,878 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 125 [2021-11-23 03:22:20,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:20,919 INFO L225 Difference]: With dead ends: 13743 [2021-11-23 03:22:20,919 INFO L226 Difference]: Without dead ends: 8083 [2021-11-23 03:22:20,941 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:22:20,942 INFO L933 BasicCegarLoop]: 147 mSDtfsCounter, 66 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:20,942 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 258 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:22:20,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8083 states. [2021-11-23 03:22:21,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8083 to 6471. [2021-11-23 03:22:21,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6471 states, 5329 states have (on average 1.3951960968286734) internal successors, (7435), 5348 states have internal predecessors, (7435), 691 states have call successors, (691), 451 states have call predecessors, (691), 450 states have return successors, (689), 672 states have call predecessors, (689), 689 states have call successors, (689) [2021-11-23 03:22:21,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6471 states to 6471 states and 8815 transitions. [2021-11-23 03:22:21,547 INFO L78 Accepts]: Start accepts. Automaton has 6471 states and 8815 transitions. Word has length 125 [2021-11-23 03:22:21,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:21,548 INFO L470 AbstractCegarLoop]: Abstraction has 6471 states and 8815 transitions. [2021-11-23 03:22:21,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:22:21,548 INFO L276 IsEmpty]: Start isEmpty. Operand 6471 states and 8815 transitions. [2021-11-23 03:22:21,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-23 03:22:21,576 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:21,576 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:21,618 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:21,789 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:21,790 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:21,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:21,790 INFO L85 PathProgramCache]: Analyzing trace with hash 1526255668, now seen corresponding path program 1 times [2021-11-23 03:22:21,790 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:21,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1204733226] [2021-11-23 03:22:21,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:21,791 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:21,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:21,862 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 03:22:21,863 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:21,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1204733226] [2021-11-23 03:22:21,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1204733226] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:21,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [324993464] [2021-11-23 03:22:21,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:21,864 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:21,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:21,865 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:21,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 03:22:22,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:22,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:22:22,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:22,337 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 03:22:22,337 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:22,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [324993464] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:22,338 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:22,338 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-11-23 03:22:22,338 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558233521] [2021-11-23 03:22:22,338 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:22,339 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:22:22,339 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:22,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:22:22,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:22:22,340 INFO L87 Difference]: Start difference. First operand 6471 states and 8815 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 5 states have internal predecessors, (79), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:22:23,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:23,179 INFO L93 Difference]: Finished difference Result 15839 states and 21533 transitions. [2021-11-23 03:22:23,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:22:23,180 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 5 states have internal predecessors, (79), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 126 [2021-11-23 03:22:23,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:23,219 INFO L225 Difference]: With dead ends: 15839 [2021-11-23 03:22:23,220 INFO L226 Difference]: Without dead ends: 9419 [2021-11-23 03:22:23,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:22:23,242 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 461 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 474 SdHoareTripleChecker+Valid, 282 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:23,242 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [474 Valid, 282 Invalid, 282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:22:23,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9419 states. [2021-11-23 03:22:23,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9419 to 9415. [2021-11-23 03:22:23,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9415 states, 7729 states have (on average 1.371846293181524) internal successors, (10603), 7756 states have internal predecessors, (10603), 1015 states have call successors, (1015), 671 states have call predecessors, (1015), 670 states have return successors, (1013), 988 states have call predecessors, (1013), 1013 states have call successors, (1013) [2021-11-23 03:22:24,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9415 states to 9415 states and 12631 transitions. [2021-11-23 03:22:24,024 INFO L78 Accepts]: Start accepts. Automaton has 9415 states and 12631 transitions. Word has length 126 [2021-11-23 03:22:24,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:24,025 INFO L470 AbstractCegarLoop]: Abstraction has 9415 states and 12631 transitions. [2021-11-23 03:22:24,025 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 5 states have internal predecessors, (79), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:22:24,026 INFO L276 IsEmpty]: Start isEmpty. Operand 9415 states and 12631 transitions. [2021-11-23 03:22:24,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-23 03:22:24,053 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:24,054 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:24,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:24,281 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 03:22:24,282 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:24,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:24,282 INFO L85 PathProgramCache]: Analyzing trace with hash 1585081262, now seen corresponding path program 1 times [2021-11-23 03:22:24,282 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:24,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1211129194] [2021-11-23 03:22:24,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:24,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:24,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:24,363 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 17 proven. 31 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 03:22:24,364 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:24,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1211129194] [2021-11-23 03:22:24,364 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1211129194] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:24,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1677006072] [2021-11-23 03:22:24,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:24,365 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:24,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:24,366 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:24,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 03:22:24,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:24,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 648 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:22:24,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:24,810 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 52 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:22:24,811 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:24,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1677006072] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:24,811 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:24,811 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-11-23 03:22:24,812 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859744923] [2021-11-23 03:22:24,812 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:24,812 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:22:24,812 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:24,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:22:24,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:22:24,813 INFO L87 Difference]: Start difference. First operand 9415 states and 12631 transitions. Second operand has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 5 states have internal predecessors, (82), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:22:25,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:25,844 INFO L93 Difference]: Finished difference Result 23065 states and 30863 transitions. [2021-11-23 03:22:25,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:22:25,845 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 5 states have internal predecessors, (82), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 128 [2021-11-23 03:22:25,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:25,909 INFO L225 Difference]: With dead ends: 23065 [2021-11-23 03:22:25,910 INFO L226 Difference]: Without dead ends: 13701 [2021-11-23 03:22:25,938 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:22:25,939 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 456 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 154 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 469 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:25,940 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [469 Valid, 287 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [154 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:22:25,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13701 states. [2021-11-23 03:22:27,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13701 to 13697. [2021-11-23 03:22:27,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13697 states, 11205 states have (on average 1.3466309683177153) internal successors, (15089), 11244 states have internal predecessors, (15089), 1493 states have call successors, (1493), 999 states have call predecessors, (1493), 998 states have return successors, (1491), 1454 states have call predecessors, (1491), 1491 states have call successors, (1491) [2021-11-23 03:22:27,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13697 states to 13697 states and 18073 transitions. [2021-11-23 03:22:27,193 INFO L78 Accepts]: Start accepts. Automaton has 13697 states and 18073 transitions. Word has length 128 [2021-11-23 03:22:27,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:27,193 INFO L470 AbstractCegarLoop]: Abstraction has 13697 states and 18073 transitions. [2021-11-23 03:22:27,194 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 5 states have internal predecessors, (82), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:22:27,194 INFO L276 IsEmpty]: Start isEmpty. Operand 13697 states and 18073 transitions. [2021-11-23 03:22:27,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-23 03:22:27,228 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:27,228 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:27,272 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-11-23 03:22:27,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 03:22:27,442 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:27,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:27,442 INFO L85 PathProgramCache]: Analyzing trace with hash 882964627, now seen corresponding path program 1 times [2021-11-23 03:22:27,442 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:27,443 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [90529083] [2021-11-23 03:22:27,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:27,443 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:27,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:27,531 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 4 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 03:22:27,531 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:27,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [90529083] [2021-11-23 03:22:27,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [90529083] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:27,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [540793671] [2021-11-23 03:22:27,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:27,532 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:27,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:27,534 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:27,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 03:22:27,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:27,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 631 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:22:27,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:27,968 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 03:22:27,969 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:27,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [540793671] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:27,969 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:27,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 03:22:27,970 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1730383211] [2021-11-23 03:22:27,970 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:27,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:27,971 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:27,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:27,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:22:27,972 INFO L87 Difference]: Start difference. First operand 13697 states and 18073 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:22:29,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:29,048 INFO L93 Difference]: Finished difference Result 26171 states and 34863 transitions. [2021-11-23 03:22:29,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:29,049 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 126 [2021-11-23 03:22:29,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:29,133 INFO L225 Difference]: With dead ends: 26171 [2021-11-23 03:22:29,134 INFO L226 Difference]: Without dead ends: 17075 [2021-11-23 03:22:29,161 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:22:29,162 INFO L933 BasicCegarLoop]: 205 mSDtfsCounter, 81 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:29,162 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 333 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:22:29,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17075 states. [2021-11-23 03:22:30,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17075 to 15515. [2021-11-23 03:22:30,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15515 states, 12807 states have (on average 1.3594909034121965) internal successors, (17411), 12846 states have internal predecessors, (17411), 1601 states have call successors, (1601), 1107 states have call predecessors, (1601), 1106 states have return successors, (1599), 1562 states have call predecessors, (1599), 1599 states have call successors, (1599) [2021-11-23 03:22:30,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15515 states to 15515 states and 20611 transitions. [2021-11-23 03:22:30,299 INFO L78 Accepts]: Start accepts. Automaton has 15515 states and 20611 transitions. Word has length 126 [2021-11-23 03:22:30,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:30,300 INFO L470 AbstractCegarLoop]: Abstraction has 15515 states and 20611 transitions. [2021-11-23 03:22:30,300 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:22:30,300 INFO L276 IsEmpty]: Start isEmpty. Operand 15515 states and 20611 transitions. [2021-11-23 03:22:30,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-23 03:22:30,342 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:30,343 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:30,389 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:30,569 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:30,570 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:30,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:30,570 INFO L85 PathProgramCache]: Analyzing trace with hash -550034518, now seen corresponding path program 1 times [2021-11-23 03:22:30,570 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:30,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [300532260] [2021-11-23 03:22:30,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:30,571 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:30,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:30,681 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 31 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:22:30,681 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:30,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [300532260] [2021-11-23 03:22:30,681 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [300532260] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:30,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1702944869] [2021-11-23 03:22:30,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:30,682 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:30,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:30,686 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:30,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 03:22:30,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:30,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 648 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:22:30,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:31,041 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 03:22:31,041 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:31,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1702944869] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:31,042 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:31,042 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-11-23 03:22:31,042 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173414210] [2021-11-23 03:22:31,043 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:31,043 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:22:31,043 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:31,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:22:31,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:22:31,044 INFO L87 Difference]: Start difference. First operand 15515 states and 20611 transitions. Second operand has 6 states, 5 states have (on average 17.0) internal successors, (85), 5 states have internal predecessors, (85), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:22:32,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:32,439 INFO L93 Difference]: Finished difference Result 37046 states and 49106 transitions. [2021-11-23 03:22:32,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:22:32,440 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 17.0) internal successors, (85), 5 states have internal predecessors, (85), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 128 [2021-11-23 03:22:32,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:32,521 INFO L225 Difference]: With dead ends: 37046 [2021-11-23 03:22:32,521 INFO L226 Difference]: Without dead ends: 21582 [2021-11-23 03:22:32,556 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:22:32,557 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 355 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 368 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:32,557 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [368 Valid, 346 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:22:32,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21582 states. [2021-11-23 03:22:33,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21582 to 21578. [2021-11-23 03:22:33,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21578 states, 17714 states have (on average 1.3374731850513717) internal successors, (23692), 17771 states have internal predecessors, (23692), 2287 states have call successors, (2287), 1577 states have call predecessors, (2287), 1576 states have return successors, (2285), 2230 states have call predecessors, (2285), 2285 states have call successors, (2285) [2021-11-23 03:22:33,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21578 states to 21578 states and 28264 transitions. [2021-11-23 03:22:33,881 INFO L78 Accepts]: Start accepts. Automaton has 21578 states and 28264 transitions. Word has length 128 [2021-11-23 03:22:33,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:33,882 INFO L470 AbstractCegarLoop]: Abstraction has 21578 states and 28264 transitions. [2021-11-23 03:22:33,882 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 17.0) internal successors, (85), 5 states have internal predecessors, (85), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:22:33,882 INFO L276 IsEmpty]: Start isEmpty. Operand 21578 states and 28264 transitions. [2021-11-23 03:22:33,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 03:22:33,927 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:33,928 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:33,975 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:34,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 03:22:34,142 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:34,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:34,142 INFO L85 PathProgramCache]: Analyzing trace with hash -1105620236, now seen corresponding path program 1 times [2021-11-23 03:22:34,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:34,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504057706] [2021-11-23 03:22:34,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:34,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:34,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:34,212 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 37 proven. 13 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-23 03:22:34,212 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:34,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504057706] [2021-11-23 03:22:34,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504057706] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:34,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1696383123] [2021-11-23 03:22:34,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:34,213 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:34,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:34,214 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:34,249 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 03:22:34,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:34,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 662 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 03:22:34,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:34,594 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:22:34,594 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:34,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1696383123] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:34,595 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:34,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2021-11-23 03:22:34,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785247561] [2021-11-23 03:22:34,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:34,597 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:34,597 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:34,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:34,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:22:34,598 INFO L87 Difference]: Start difference. First operand 21578 states and 28264 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:22:35,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:35,857 INFO L93 Difference]: Finished difference Result 40164 states and 52876 transitions. [2021-11-23 03:22:35,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:35,858 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 130 [2021-11-23 03:22:35,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:36,115 INFO L225 Difference]: With dead ends: 40164 [2021-11-23 03:22:36,115 INFO L226 Difference]: Without dead ends: 25136 [2021-11-23 03:22:36,145 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:22:36,146 INFO L933 BasicCegarLoop]: 142 mSDtfsCounter, 98 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:36,147 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 178 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:22:36,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25136 states. [2021-11-23 03:22:37,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25136 to 24868. [2021-11-23 03:22:37,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24868 states, 20765 states have (on average 1.3130267276667469) internal successors, (27265), 20822 states have internal predecessors, (27265), 2325 states have call successors, (2325), 1778 states have call predecessors, (2325), 1777 states have return successors, (2495), 2268 states have call predecessors, (2495), 2323 states have call successors, (2495) [2021-11-23 03:22:37,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24868 states to 24868 states and 32085 transitions. [2021-11-23 03:22:37,743 INFO L78 Accepts]: Start accepts. Automaton has 24868 states and 32085 transitions. Word has length 130 [2021-11-23 03:22:37,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:37,743 INFO L470 AbstractCegarLoop]: Abstraction has 24868 states and 32085 transitions. [2021-11-23 03:22:37,743 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:22:37,743 INFO L276 IsEmpty]: Start isEmpty. Operand 24868 states and 32085 transitions. [2021-11-23 03:22:37,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-23 03:22:37,796 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:37,796 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:37,847 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:38,021 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:38,022 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:38,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:38,022 INFO L85 PathProgramCache]: Analyzing trace with hash 961186770, now seen corresponding path program 1 times [2021-11-23 03:22:38,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:38,022 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993273844] [2021-11-23 03:22:38,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:38,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:38,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:38,108 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 46 proven. 20 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 03:22:38,108 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:38,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993273844] [2021-11-23 03:22:38,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [993273844] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:38,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1430378566] [2021-11-23 03:22:38,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:38,109 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:38,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:38,110 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:38,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 03:22:38,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:38,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 660 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 03:22:38,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:38,478 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:22:38,478 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:38,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1430378566] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:38,478 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:38,479 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 6 [2021-11-23 03:22:38,479 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757882378] [2021-11-23 03:22:38,479 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:38,480 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:22:38,480 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:38,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:22:38,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:22:38,481 INFO L87 Difference]: Start difference. First operand 24868 states and 32085 transitions. Second operand has 6 states, 6 states have (on average 18.166666666666668) internal successors, (109), 6 states have internal predecessors, (109), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-11-23 03:22:40,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:40,428 INFO L93 Difference]: Finished difference Result 49178 states and 63667 transitions. [2021-11-23 03:22:40,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 03:22:40,429 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.166666666666668) internal successors, (109), 6 states have internal predecessors, (109), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 132 [2021-11-23 03:22:40,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:40,525 INFO L225 Difference]: With dead ends: 49178 [2021-11-23 03:22:40,525 INFO L226 Difference]: Without dead ends: 31960 [2021-11-23 03:22:40,559 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:22:40,559 INFO L933 BasicCegarLoop]: 213 mSDtfsCounter, 238 mSDsluCounter, 432 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 572 SdHoareTripleChecker+Invalid, 358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:40,560 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [254 Valid, 572 Invalid, 358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 296 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:22:40,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31960 states. [2021-11-23 03:22:42,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31960 to 30332. [2021-11-23 03:22:42,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30332 states, 25243 states have (on average 1.3019450936893395) internal successors, (32865), 25264 states have internal predecessors, (32865), 2931 states have call successors, (2931), 2222 states have call predecessors, (2931), 2157 states have return successors, (3191), 2846 states have call predecessors, (3191), 2929 states have call successors, (3191) [2021-11-23 03:22:43,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30332 states to 30332 states and 38987 transitions. [2021-11-23 03:22:43,019 INFO L78 Accepts]: Start accepts. Automaton has 30332 states and 38987 transitions. Word has length 132 [2021-11-23 03:22:43,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:43,019 INFO L470 AbstractCegarLoop]: Abstraction has 30332 states and 38987 transitions. [2021-11-23 03:22:43,019 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.166666666666668) internal successors, (109), 6 states have internal predecessors, (109), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-11-23 03:22:43,019 INFO L276 IsEmpty]: Start isEmpty. Operand 30332 states and 38987 transitions. [2021-11-23 03:22:43,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-23 03:22:43,080 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:43,080 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 03:22:43,124 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:43,293 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:43,294 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:43,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:43,294 INFO L85 PathProgramCache]: Analyzing trace with hash 1092151709, now seen corresponding path program 1 times [2021-11-23 03:22:43,294 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:43,294 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1245947182] [2021-11-23 03:22:43,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:43,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:43,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:43,364 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 24 proven. 3 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 03:22:43,364 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:43,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1245947182] [2021-11-23 03:22:43,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1245947182] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:43,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1285401728] [2021-11-23 03:22:43,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:43,367 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:43,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:43,369 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:43,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 03:22:43,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:43,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:22:43,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:43,770 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 03:22:43,770 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:43,770 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1285401728] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:43,770 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:43,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 03:22:43,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312408088] [2021-11-23 03:22:43,771 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:43,772 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:43,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:43,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:43,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:22:43,773 INFO L87 Difference]: Start difference. First operand 30332 states and 38987 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:22:45,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:45,895 INFO L93 Difference]: Finished difference Result 56938 states and 73991 transitions. [2021-11-23 03:22:45,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:45,895 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 126 [2021-11-23 03:22:45,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:46,000 INFO L225 Difference]: With dead ends: 56938 [2021-11-23 03:22:46,000 INFO L226 Difference]: Without dead ends: 36694 [2021-11-23 03:22:46,034 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:22:46,035 INFO L933 BasicCegarLoop]: 189 mSDtfsCounter, 73 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:46,035 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 317 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:22:46,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36694 states. [2021-11-23 03:22:48,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36694 to 33282. [2021-11-23 03:22:48,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33282 states, 27809 states have (on average 1.3101154302563918) internal successors, (36433), 27830 states have internal predecessors, (36433), 3123 states have call successors, (3123), 2414 states have call predecessors, (3123), 2349 states have return successors, (3383), 3038 states have call predecessors, (3383), 3121 states have call successors, (3383) [2021-11-23 03:22:48,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33282 states to 33282 states and 42939 transitions. [2021-11-23 03:22:48,176 INFO L78 Accepts]: Start accepts. Automaton has 33282 states and 42939 transitions. Word has length 126 [2021-11-23 03:22:48,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:48,177 INFO L470 AbstractCegarLoop]: Abstraction has 33282 states and 42939 transitions. [2021-11-23 03:22:48,178 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:22:48,178 INFO L276 IsEmpty]: Start isEmpty. Operand 33282 states and 42939 transitions. [2021-11-23 03:22:48,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 03:22:48,216 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:48,216 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:48,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:48,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:48,418 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:48,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:48,419 INFO L85 PathProgramCache]: Analyzing trace with hash 1740047414, now seen corresponding path program 1 times [2021-11-23 03:22:48,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:48,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1383672264] [2021-11-23 03:22:48,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:48,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:48,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:48,697 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 41 proven. 15 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 03:22:48,698 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:48,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1383672264] [2021-11-23 03:22:48,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1383672264] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:48,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1068415188] [2021-11-23 03:22:48,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:48,699 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:48,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:48,700 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:48,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 03:22:48,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:48,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 662 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 03:22:48,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:49,112 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 03:22:49,113 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:49,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1068415188] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:49,113 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:49,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2021-11-23 03:22:49,114 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219802046] [2021-11-23 03:22:49,114 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:49,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:49,115 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:49,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:49,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:22:49,116 INFO L87 Difference]: Start difference. First operand 33282 states and 42939 transitions. Second operand has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:22:51,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:51,420 INFO L93 Difference]: Finished difference Result 61062 states and 79446 transitions. [2021-11-23 03:22:51,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:51,423 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 130 [2021-11-23 03:22:51,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:51,515 INFO L225 Difference]: With dead ends: 61062 [2021-11-23 03:22:51,515 INFO L226 Difference]: Without dead ends: 37832 [2021-11-23 03:22:51,545 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:22:51,546 INFO L933 BasicCegarLoop]: 148 mSDtfsCounter, 104 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:51,546 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 184 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:22:51,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37832 states. [2021-11-23 03:22:53,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37832 to 37068. [2021-11-23 03:22:53,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37068 states, 31319 states have (on average 1.2908777419457838) internal successors, (40429), 31394 states have internal predecessors, (40429), 3159 states have call successors, (3159), 2594 states have call predecessors, (3159), 2589 states have return successors, (3619), 3080 states have call predecessors, (3619), 3157 states have call successors, (3619) [2021-11-23 03:22:53,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37068 states to 37068 states and 47207 transitions. [2021-11-23 03:22:53,944 INFO L78 Accepts]: Start accepts. Automaton has 37068 states and 47207 transitions. Word has length 130 [2021-11-23 03:22:53,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:53,945 INFO L470 AbstractCegarLoop]: Abstraction has 37068 states and 47207 transitions. [2021-11-23 03:22:53,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:22:53,945 INFO L276 IsEmpty]: Start isEmpty. Operand 37068 states and 47207 transitions. [2021-11-23 03:22:53,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-23 03:22:53,997 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:53,997 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:54,038 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:54,215 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-23 03:22:54,216 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:54,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:54,216 INFO L85 PathProgramCache]: Analyzing trace with hash 1739582671, now seen corresponding path program 1 times [2021-11-23 03:22:54,216 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:54,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530338184] [2021-11-23 03:22:54,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:54,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:54,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:54,308 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 26 proven. 1 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-23 03:22:54,308 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:54,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530338184] [2021-11-23 03:22:54,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530338184] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:22:54,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2141641772] [2021-11-23 03:22:54,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:54,309 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:54,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:54,314 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:54,336 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 03:22:54,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:54,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 642 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:22:54,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:54,746 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 03:22:54,747 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:22:54,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2141641772] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:54,747 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:22:54,747 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 03:22:54,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189421935] [2021-11-23 03:22:54,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:54,752 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:54,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:54,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:54,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:22:54,753 INFO L87 Difference]: Start difference. First operand 37068 states and 47207 transitions. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:22:57,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:57,257 INFO L93 Difference]: Finished difference Result 68752 states and 88435 transitions. [2021-11-23 03:22:57,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:57,259 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 127 [2021-11-23 03:22:57,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:57,436 INFO L225 Difference]: With dead ends: 68752 [2021-11-23 03:22:57,436 INFO L226 Difference]: Without dead ends: 44448 [2021-11-23 03:22:57,477 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:22:57,485 INFO L933 BasicCegarLoop]: 195 mSDtfsCounter, 67 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:57,485 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 323 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:22:57,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44448 states. [2021-11-23 03:23:00,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44448 to 41192. [2021-11-23 03:23:00,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41192 states, 34931 states have (on average 1.3047722653230656) internal successors, (45577), 35006 states have internal predecessors, (45577), 3415 states have call successors, (3415), 2850 states have call predecessors, (3415), 2845 states have return successors, (3875), 3336 states have call predecessors, (3875), 3413 states have call successors, (3875) [2021-11-23 03:23:00,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41192 states to 41192 states and 52867 transitions. [2021-11-23 03:23:00,374 INFO L78 Accepts]: Start accepts. Automaton has 41192 states and 52867 transitions. Word has length 127 [2021-11-23 03:23:00,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:00,375 INFO L470 AbstractCegarLoop]: Abstraction has 41192 states and 52867 transitions. [2021-11-23 03:23:00,375 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:23:00,375 INFO L276 IsEmpty]: Start isEmpty. Operand 41192 states and 52867 transitions. [2021-11-23 03:23:00,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-23 03:23:00,415 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:00,415 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:00,441 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2021-11-23 03:23:00,616 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-23 03:23:00,616 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:00,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:00,616 INFO L85 PathProgramCache]: Analyzing trace with hash 545754179, now seen corresponding path program 1 times [2021-11-23 03:23:00,617 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:00,617 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943037937] [2021-11-23 03:23:00,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:00,617 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:00,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:00,798 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 13 proven. 49 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 03:23:00,799 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:00,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943037937] [2021-11-23 03:23:00,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [943037937] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:23:00,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1593347544] [2021-11-23 03:23:00,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:00,800 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:23:00,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:23:00,801 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:23:00,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66b18bc9-ced5-4f5e-93f5-8fe3e638c8ce/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 03:23:00,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:00,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 714 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 03:23:00,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:23:01,358 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 68 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:23:01,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:23:02,144 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-23 03:23:02,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1593347544] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:23:02,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1920263799] [2021-11-23 03:23:02,180 INFO L159 IcfgInterpreter]: Started Sifa with 73 locations of interest [2021-11-23 03:23:02,180 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:23:02,189 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:23:02,197 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:23:02,198 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:23:16,355 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 142 for LOIs [2021-11-23 03:24:06,212 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 195 for LOIs