./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.15.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.15.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d827a13f264a8106bf76fcdb72d7bd8ed8c070aef2487e4bd9a858009359b9d5 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 17:51:07,977 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 17:51:07,980 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 17:51:08,032 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 17:51:08,033 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 17:51:08,037 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 17:51:08,039 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 17:51:08,042 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 17:51:08,045 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 17:51:08,050 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 17:51:08,051 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 17:51:08,053 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 17:51:08,053 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 17:51:08,056 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 17:51:08,058 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 17:51:08,066 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 17:51:08,067 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 17:51:08,068 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 17:51:08,070 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 17:51:08,078 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 17:51:08,080 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 17:51:08,081 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 17:51:08,084 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 17:51:08,085 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 17:51:08,093 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 17:51:08,094 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 17:51:08,094 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 17:51:08,096 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 17:51:08,097 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 17:51:08,098 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 17:51:08,099 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 17:51:08,100 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 17:51:08,101 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 17:51:08,102 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 17:51:08,104 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 17:51:08,104 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 17:51:08,105 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 17:51:08,105 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 17:51:08,105 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 17:51:08,106 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 17:51:08,107 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 17:51:08,108 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 17:51:08,151 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 17:51:08,152 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 17:51:08,158 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 17:51:08,158 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 17:51:08,159 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 17:51:08,160 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 17:51:08,160 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 17:51:08,160 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 17:51:08,160 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 17:51:08,160 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 17:51:08,161 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 17:51:08,162 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 17:51:08,162 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 17:51:08,162 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 17:51:08,162 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 17:51:08,162 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 17:51:08,163 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 17:51:08,163 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 17:51:08,164 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 17:51:08,164 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 17:51:08,164 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 17:51:08,165 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 17:51:08,165 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 17:51:08,165 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 17:51:08,165 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 17:51:08,166 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 17:51:08,167 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 17:51:08,167 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 17:51:08,167 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 17:51:08,168 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 17:51:08,168 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 17:51:08,168 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 17:51:08,168 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:51:08,169 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 17:51:08,169 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 17:51:08,169 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 17:51:08,169 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 17:51:08,169 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 17:51:08,170 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 17:51:08,170 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 17:51:08,170 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 17:51:08,170 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_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d827a13f264a8106bf76fcdb72d7bd8ed8c070aef2487e4bd9a858009359b9d5 [2021-11-25 17:51:08,465 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 17:51:08,484 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 17:51:08,487 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 17:51:08,488 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 17:51:08,489 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 17:51:08,490 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/systemc/token_ring.15.cil.c [2021-11-25 17:51:08,582 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/data/d386f1345/ae0e56f122f646348400024979688305/FLAG134b0b3c3 [2021-11-25 17:51:09,086 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 17:51:09,087 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/sv-benchmarks/c/systemc/token_ring.15.cil.c [2021-11-25 17:51:09,104 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/data/d386f1345/ae0e56f122f646348400024979688305/FLAG134b0b3c3 [2021-11-25 17:51:09,418 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/data/d386f1345/ae0e56f122f646348400024979688305 [2021-11-25 17:51:09,426 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 17:51:09,427 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 17:51:09,432 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 17:51:09,433 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 17:51:09,436 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 17:51:09,436 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:51:09" (1/1) ... [2021-11-25 17:51:09,437 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@58e64467 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:51:09, skipping insertion in model container [2021-11-25 17:51:09,438 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:51:09" (1/1) ... [2021-11-25 17:51:09,445 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 17:51:09,511 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 17:51:09,685 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_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/sv-benchmarks/c/systemc/token_ring.15.cil.c[669,682] [2021-11-25 17:51:09,854 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:51:09,864 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 17:51:09,878 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_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/sv-benchmarks/c/systemc/token_ring.15.cil.c[669,682] [2021-11-25 17:51:09,994 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:51:10,016 INFO L208 MainTranslator]: Completed translation [2021-11-25 17:51:10,017 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:51:10 WrapperNode [2021-11-25 17:51:10,017 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 17:51:10,018 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 17:51:10,019 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 17:51:10,019 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 17:51:10,027 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:51:10" (1/1) ... [2021-11-25 17:51:10,055 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:51:10" (1/1) ... [2021-11-25 17:51:10,136 INFO L137 Inliner]: procedures = 54, calls = 71, calls flagged for inlining = 37, calls inlined = 37, statements flattened = 914 [2021-11-25 17:51:10,142 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 17:51:10,143 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 17:51:10,144 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 17:51:10,145 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 17:51:10,156 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:51:10" (1/1) ... [2021-11-25 17:51:10,156 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:51:10" (1/1) ... [2021-11-25 17:51:10,161 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:51:10" (1/1) ... [2021-11-25 17:51:10,161 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:51:10" (1/1) ... [2021-11-25 17:51:10,178 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:51:10" (1/1) ... [2021-11-25 17:51:10,208 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:51:10" (1/1) ... [2021-11-25 17:51:10,212 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:51:10" (1/1) ... [2021-11-25 17:51:10,219 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 17:51:10,220 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 17:51:10,220 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 17:51:10,220 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 17:51:10,224 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:51:10" (1/1) ... [2021-11-25 17:51:10,231 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:51:10,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:51:10,256 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 17:51:10,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 17:51:10,300 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 17:51:10,301 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-25 17:51:10,301 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-25 17:51:10,301 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-25 17:51:10,301 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-25 17:51:10,302 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-25 17:51:10,302 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-25 17:51:10,302 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-25 17:51:10,302 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-25 17:51:10,302 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-25 17:51:10,303 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-25 17:51:10,303 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-25 17:51:10,303 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-25 17:51:10,303 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-25 17:51:10,304 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-25 17:51:10,304 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 17:51:10,304 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 17:51:10,304 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 17:51:10,411 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 17:51:10,419 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 17:51:11,244 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 17:51:11,684 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 17:51:11,684 INFO L301 CfgBuilder]: Removed 16 assume(true) statements. [2021-11-25 17:51:11,688 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:51:11 BoogieIcfgContainer [2021-11-25 17:51:11,688 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 17:51:11,690 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 17:51:11,690 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 17:51:11,693 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 17:51:11,694 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 05:51:09" (1/3) ... [2021-11-25 17:51:11,695 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38d712ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:51:11, skipping insertion in model container [2021-11-25 17:51:11,695 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:51:10" (2/3) ... [2021-11-25 17:51:11,695 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38d712ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:51:11, skipping insertion in model container [2021-11-25 17:51:11,695 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:51:11" (3/3) ... [2021-11-25 17:51:11,697 INFO L111 eAbstractionObserver]: Analyzing ICFG token_ring.15.cil.c [2021-11-25 17:51:11,703 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 17:51:11,704 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 17:51:11,768 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 17:51:11,777 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 17:51:11,777 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 17:51:11,806 INFO L276 IsEmpty]: Start isEmpty. Operand has 205 states, 167 states have (on average 1.5688622754491017) internal successors, (262), 171 states have internal predecessors, (262), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) [2021-11-25 17:51:11,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 17:51:11,819 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:51:11,820 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:51:11,821 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:51:11,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:51:11,825 INFO L85 PathProgramCache]: Analyzing trace with hash 801565801, now seen corresponding path program 1 times [2021-11-25 17:51:11,834 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:51:11,835 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478804282] [2021-11-25 17:51:11,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:11,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:51:11,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:12,286 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:51:12,286 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:51:12,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478804282] [2021-11-25 17:51:12,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [478804282] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:51:12,288 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:51:12,288 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 17:51:12,289 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790606156] [2021-11-25 17:51:12,290 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:51:12,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 17:51:12,294 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:51:12,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 17:51:12,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:51:12,342 INFO L87 Difference]: Start difference. First operand has 205 states, 167 states have (on average 1.5688622754491017) internal successors, (262), 171 states have internal predecessors, (262), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) Second operand has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 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) [2021-11-25 17:51:12,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:51:12,925 INFO L93 Difference]: Finished difference Result 592 states and 943 transitions. [2021-11-25 17:51:12,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 17:51:12,928 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 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 70 [2021-11-25 17:51:12,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:51:12,942 INFO L225 Difference]: With dead ends: 592 [2021-11-25 17:51:12,942 INFO L226 Difference]: Without dead ends: 388 [2021-11-25 17:51:12,949 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 [2021-11-25 17:51:12,952 INFO L933 BasicCegarLoop]: 492 mSDtfsCounter, 553 mSDsluCounter, 487 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 553 SdHoareTripleChecker+Valid, 880 SdHoareTripleChecker+Invalid, 333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:51:12,953 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [553 Valid, 880 Invalid, 333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 17:51:12,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 388 states. [2021-11-25 17:51:13,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 388 to 387. [2021-11-25 17:51:13,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 387 states, 322 states have (on average 1.5341614906832297) internal successors, (494), 325 states have internal predecessors, (494), 52 states have call successors, (52), 13 states have call predecessors, (52), 12 states have return successors, (50), 49 states have call predecessors, (50), 50 states have call successors, (50) [2021-11-25 17:51:13,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 596 transitions. [2021-11-25 17:51:13,035 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 596 transitions. Word has length 70 [2021-11-25 17:51:13,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:51:13,036 INFO L470 AbstractCegarLoop]: Abstraction has 387 states and 596 transitions. [2021-11-25 17:51:13,036 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 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) [2021-11-25 17:51:13,036 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 596 transitions. [2021-11-25 17:51:13,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 17:51:13,047 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:51:13,047 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:51:13,048 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 17:51:13,048 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:51:13,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:51:13,049 INFO L85 PathProgramCache]: Analyzing trace with hash 1706203696, now seen corresponding path program 1 times [2021-11-25 17:51:13,049 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:51:13,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [522254174] [2021-11-25 17:51:13,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:13,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:51:13,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:13,226 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-25 17:51:13,226 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:51:13,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [522254174] [2021-11-25 17:51:13,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [522254174] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:51:13,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [147835035] [2021-11-25 17:51:13,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:13,228 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:51:13,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:51:13,259 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:51:13,265 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 17:51:13,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:13,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 1063 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 17:51:13,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:51:13,825 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 17:51:13,828 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:51:13,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [147835035] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:51:13,829 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:51:13,830 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2021-11-25 17:51:13,831 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478015106] [2021-11-25 17:51:13,831 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:51:13,834 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:51:13,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:51:13,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:51:13,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:51:13,838 INFO L87 Difference]: Start difference. First operand 387 states and 596 transitions. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 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) [2021-11-25 17:51:14,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:51:14,024 INFO L93 Difference]: Finished difference Result 1144 states and 1793 transitions. [2021-11-25 17:51:14,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:51:14,025 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 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 143 [2021-11-25 17:51:14,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:51:14,036 INFO L225 Difference]: With dead ends: 1144 [2021-11-25 17:51:14,036 INFO L226 Difference]: Without dead ends: 762 [2021-11-25 17:51:14,039 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:51:14,041 INFO L933 BasicCegarLoop]: 321 mSDtfsCounter, 285 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 285 SdHoareTripleChecker+Valid, 570 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:51:14,042 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [285 Valid, 570 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:51:14,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 762 states. [2021-11-25 17:51:14,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 762 to 756. [2021-11-25 17:51:14,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 756 states, 635 states have (on average 1.5322834645669292) internal successors, (973), 639 states have internal predecessors, (973), 96 states have call successors, (96), 25 states have call predecessors, (96), 24 states have return successors, (94), 92 states have call predecessors, (94), 94 states have call successors, (94) [2021-11-25 17:51:14,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 756 states to 756 states and 1163 transitions. [2021-11-25 17:51:14,156 INFO L78 Accepts]: Start accepts. Automaton has 756 states and 1163 transitions. Word has length 143 [2021-11-25 17:51:14,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:51:14,156 INFO L470 AbstractCegarLoop]: Abstraction has 756 states and 1163 transitions. [2021-11-25 17:51:14,157 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 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) [2021-11-25 17:51:14,157 INFO L276 IsEmpty]: Start isEmpty. Operand 756 states and 1163 transitions. [2021-11-25 17:51:14,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 17:51:14,169 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:51:14,170 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:51:14,209 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 17:51:14,383 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-25 17:51:14,383 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:51:14,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:51:14,384 INFO L85 PathProgramCache]: Analyzing trace with hash -278678802, now seen corresponding path program 1 times [2021-11-25 17:51:14,384 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:51:14,384 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300137880] [2021-11-25 17:51:14,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:14,385 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:51:14,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:14,536 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-25 17:51:14,536 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:51:14,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300137880] [2021-11-25 17:51:14,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1300137880] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:51:14,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1577910511] [2021-11-25 17:51:14,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:14,541 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:51:14,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:51:14,547 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:51:14,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 17:51:14,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:14,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 1057 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 17:51:14,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:51:15,042 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 17:51:15,043 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:51:15,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1577910511] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:51:15,044 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:51:15,044 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2021-11-25 17:51:15,044 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965841904] [2021-11-25 17:51:15,044 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:51:15,046 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:51:15,046 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:51:15,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:51:15,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:51:15,048 INFO L87 Difference]: Start difference. First operand 756 states and 1163 transitions. Second operand has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 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) [2021-11-25 17:51:15,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:51:15,242 INFO L93 Difference]: Finished difference Result 2245 states and 3514 transitions. [2021-11-25 17:51:15,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:51:15,243 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 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 143 [2021-11-25 17:51:15,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:51:15,255 INFO L225 Difference]: With dead ends: 2245 [2021-11-25 17:51:15,255 INFO L226 Difference]: Without dead ends: 1494 [2021-11-25 17:51:15,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:51:15,259 INFO L933 BasicCegarLoop]: 280 mSDtfsCounter, 261 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 529 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:51:15,260 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [261 Valid, 529 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:51:15,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1494 states. [2021-11-25 17:51:15,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1494 to 1486. [2021-11-25 17:51:15,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1486 states, 1255 states have (on average 1.5290836653386455) internal successors, (1919), 1261 states have internal predecessors, (1919), 182 states have call successors, (182), 49 states have call predecessors, (182), 48 states have return successors, (180), 176 states have call predecessors, (180), 180 states have call successors, (180) [2021-11-25 17:51:15,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1486 states to 1486 states and 2281 transitions. [2021-11-25 17:51:15,351 INFO L78 Accepts]: Start accepts. Automaton has 1486 states and 2281 transitions. Word has length 143 [2021-11-25 17:51:15,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:51:15,352 INFO L470 AbstractCegarLoop]: Abstraction has 1486 states and 2281 transitions. [2021-11-25 17:51:15,352 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 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) [2021-11-25 17:51:15,352 INFO L276 IsEmpty]: Start isEmpty. Operand 1486 states and 2281 transitions. [2021-11-25 17:51:15,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 17:51:15,358 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:51:15,358 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:51:15,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 17:51:15,583 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:51:15,583 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:51:15,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:51:15,584 INFO L85 PathProgramCache]: Analyzing trace with hash -881744468, now seen corresponding path program 1 times [2021-11-25 17:51:15,584 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:51:15,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1091303976] [2021-11-25 17:51:15,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:15,585 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:51:15,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:15,676 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-25 17:51:15,677 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:51:15,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1091303976] [2021-11-25 17:51:15,677 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1091303976] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:51:15,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1549317684] [2021-11-25 17:51:15,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:15,680 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:51:15,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:51:15,687 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:51:15,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 17:51:15,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:15,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 1051 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 17:51:15,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:51:16,185 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 17:51:16,185 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:51:16,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1549317684] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:51:16,185 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:51:16,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2021-11-25 17:51:16,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453208117] [2021-11-25 17:51:16,186 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:51:16,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:51:16,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:51:16,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:51:16,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:51:16,188 INFO L87 Difference]: Start difference. First operand 1486 states and 2281 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 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) [2021-11-25 17:51:16,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:51:16,420 INFO L93 Difference]: Finished difference Result 4423 states and 6906 transitions. [2021-11-25 17:51:16,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:51:16,421 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 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 143 [2021-11-25 17:51:16,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:51:16,446 INFO L225 Difference]: With dead ends: 4423 [2021-11-25 17:51:16,447 INFO L226 Difference]: Without dead ends: 2942 [2021-11-25 17:51:16,455 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:51:16,456 INFO L933 BasicCegarLoop]: 280 mSDtfsCounter, 288 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 529 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:51:16,456 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [288 Valid, 529 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:51:16,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2942 states. [2021-11-25 17:51:16,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2942 to 2930. [2021-11-25 17:51:16,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2930 states, 2483 states have (on average 1.5251711639146195) internal successors, (3787), 2493 states have internal predecessors, (3787), 350 states have call successors, (350), 97 states have call predecessors, (350), 96 states have return successors, (348), 340 states have call predecessors, (348), 348 states have call successors, (348) [2021-11-25 17:51:16,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2930 states to 2930 states and 4485 transitions. [2021-11-25 17:51:16,656 INFO L78 Accepts]: Start accepts. Automaton has 2930 states and 4485 transitions. Word has length 143 [2021-11-25 17:51:16,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:51:16,657 INFO L470 AbstractCegarLoop]: Abstraction has 2930 states and 4485 transitions. [2021-11-25 17:51:16,657 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 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) [2021-11-25 17:51:16,657 INFO L276 IsEmpty]: Start isEmpty. Operand 2930 states and 4485 transitions. [2021-11-25 17:51:16,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 17:51:16,668 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:51:16,669 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:51:16,707 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 17:51:16,882 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:51:16,883 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:51:16,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:51:16,883 INFO L85 PathProgramCache]: Analyzing trace with hash 593488942, now seen corresponding path program 1 times [2021-11-25 17:51:16,883 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:51:16,884 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558889398] [2021-11-25 17:51:16,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:16,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:51:16,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:16,978 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 17:51:16,978 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:51:16,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558889398] [2021-11-25 17:51:16,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [558889398] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:51:16,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542178140] [2021-11-25 17:51:16,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:16,979 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:51:16,979 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:51:16,980 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:51:16,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 17:51:17,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:17,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 1045 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 17:51:17,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:51:17,467 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:51:17,467 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:51:17,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542178140] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:51:17,467 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:51:17,468 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2021-11-25 17:51:17,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639041600] [2021-11-25 17:51:17,468 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:51:17,469 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:51:17,469 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:51:17,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:51:17,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:51:17,470 INFO L87 Difference]: Start difference. First operand 2930 states and 4485 transitions. Second operand has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 2 states have internal predecessors, (106), 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) [2021-11-25 17:51:17,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:51:17,845 INFO L93 Difference]: Finished difference Result 8731 states and 13590 transitions. [2021-11-25 17:51:17,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:51:17,846 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 2 states have internal predecessors, (106), 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 143 [2021-11-25 17:51:17,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:51:17,892 INFO L225 Difference]: With dead ends: 8731 [2021-11-25 17:51:17,892 INFO L226 Difference]: Without dead ends: 5806 [2021-11-25 17:51:17,906 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:51:17,909 INFO L933 BasicCegarLoop]: 280 mSDtfsCounter, 267 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 267 SdHoareTripleChecker+Valid, 529 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:51:17,910 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [267 Valid, 529 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:51:17,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5806 states. [2021-11-25 17:51:18,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5806 to 5786. [2021-11-25 17:51:18,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5786 states, 4915 states have (on average 1.520854526958291) internal successors, (7475), 4933 states have internal predecessors, (7475), 678 states have call successors, (678), 193 states have call predecessors, (678), 192 states have return successors, (676), 660 states have call predecessors, (676), 676 states have call successors, (676) [2021-11-25 17:51:18,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5786 states to 5786 states and 8829 transitions. [2021-11-25 17:51:18,252 INFO L78 Accepts]: Start accepts. Automaton has 5786 states and 8829 transitions. Word has length 143 [2021-11-25 17:51:18,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:51:18,253 INFO L470 AbstractCegarLoop]: Abstraction has 5786 states and 8829 transitions. [2021-11-25 17:51:18,253 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 2 states have internal predecessors, (106), 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) [2021-11-25 17:51:18,253 INFO L276 IsEmpty]: Start isEmpty. Operand 5786 states and 8829 transitions. [2021-11-25 17:51:18,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 17:51:18,268 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:51:18,269 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:51:18,307 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 17:51:18,495 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:51:18,495 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:51:18,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:51:18,495 INFO L85 PathProgramCache]: Analyzing trace with hash -393193364, now seen corresponding path program 1 times [2021-11-25 17:51:18,496 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:51:18,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1722779426] [2021-11-25 17:51:18,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:18,496 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:51:18,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:18,571 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 17:51:18,572 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:51:18,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1722779426] [2021-11-25 17:51:18,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1722779426] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:51:18,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075057272] [2021-11-25 17:51:18,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:18,572 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:51:18,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:51:18,573 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:51:18,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 17:51:18,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:18,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 1039 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 17:51:18,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:51:19,100 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 17:51:19,100 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:51:19,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2075057272] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:51:19,100 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:51:19,101 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 4 [2021-11-25 17:51:19,101 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996228621] [2021-11-25 17:51:19,101 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:51:19,101 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:51:19,102 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:51:19,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:51:19,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:51:19,102 INFO L87 Difference]: Start difference. First operand 5786 states and 8829 transitions. Second operand has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 2 states have internal predecessors, (94), 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) [2021-11-25 17:51:19,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:51:19,663 INFO L93 Difference]: Finished difference Result 17251 states and 26758 transitions. [2021-11-25 17:51:19,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:51:19,664 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 2 states have internal predecessors, (94), 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 143 [2021-11-25 17:51:19,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:51:19,751 INFO L225 Difference]: With dead ends: 17251 [2021-11-25 17:51:19,751 INFO L226 Difference]: Without dead ends: 11470 [2021-11-25 17:51:19,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:51:19,780 INFO L933 BasicCegarLoop]: 280 mSDtfsCounter, 279 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 279 SdHoareTripleChecker+Valid, 529 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:51:19,780 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [279 Valid, 529 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:51:19,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11470 states. [2021-11-25 17:51:20,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11470 to 11434. [2021-11-25 17:51:20,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11434 states, 9731 states have (on average 1.51628815126914) internal successors, (14755), 9765 states have internal predecessors, (14755), 1318 states have call successors, (1318), 385 states have call predecessors, (1318), 384 states have return successors, (1316), 1284 states have call predecessors, (1316), 1316 states have call successors, (1316) [2021-11-25 17:51:20,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11434 states to 11434 states and 17389 transitions. [2021-11-25 17:51:20,498 INFO L78 Accepts]: Start accepts. Automaton has 11434 states and 17389 transitions. Word has length 143 [2021-11-25 17:51:20,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:51:20,501 INFO L470 AbstractCegarLoop]: Abstraction has 11434 states and 17389 transitions. [2021-11-25 17:51:20,502 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 2 states have internal predecessors, (94), 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) [2021-11-25 17:51:20,502 INFO L276 IsEmpty]: Start isEmpty. Operand 11434 states and 17389 transitions. [2021-11-25 17:51:20,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 17:51:20,531 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:51:20,532 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:51:20,569 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 17:51:20,755 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:51:20,755 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:51:20,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:51:20,756 INFO L85 PathProgramCache]: Analyzing trace with hash 1882871722, now seen corresponding path program 1 times [2021-11-25 17:51:20,756 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:51:20,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [729729910] [2021-11-25 17:51:20,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:20,756 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:51:20,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:20,841 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 17:51:20,841 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:51:20,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [729729910] [2021-11-25 17:51:20,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [729729910] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:51:20,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [772812205] [2021-11-25 17:51:20,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:20,842 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:51:20,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:51:20,843 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:51:20,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 17:51:21,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:21,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 1033 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 17:51:21,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:51:21,352 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 17:51:21,352 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:51:21,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [772812205] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:51:21,353 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:51:21,353 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2021-11-25 17:51:21,353 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019466611] [2021-11-25 17:51:21,353 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:51:21,354 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:51:21,354 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:51:21,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:51:21,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:51:21,354 INFO L87 Difference]: Start difference. First operand 11434 states and 17389 transitions. Second operand has 3 states, 3 states have (on average 38.333333333333336) internal successors, (115), 2 states have internal predecessors, (115), 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) [2021-11-25 17:51:22,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:51:22,480 INFO L93 Difference]: Finished difference Result 34099 states and 52694 transitions. [2021-11-25 17:51:22,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:51:22,481 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.333333333333336) internal successors, (115), 2 states have internal predecessors, (115), 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 143 [2021-11-25 17:51:22,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:51:22,605 INFO L225 Difference]: With dead ends: 34099 [2021-11-25 17:51:22,605 INFO L226 Difference]: Without dead ends: 22670 [2021-11-25 17:51:22,650 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:51:22,651 INFO L933 BasicCegarLoop]: 280 mSDtfsCounter, 258 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 258 SdHoareTripleChecker+Valid, 529 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:51:22,651 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [258 Valid, 529 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:51:22,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22670 states. [2021-11-25 17:51:23,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22670 to 22602. [2021-11-25 17:51:23,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22602 states, 19267 states have (on average 1.5115482431099807) internal successors, (29123), 19333 states have internal predecessors, (29123), 2566 states have call successors, (2566), 769 states have call predecessors, (2566), 768 states have return successors, (2564), 2500 states have call predecessors, (2564), 2564 states have call successors, (2564) [2021-11-25 17:51:23,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22602 states to 22602 states and 34253 transitions. [2021-11-25 17:51:23,809 INFO L78 Accepts]: Start accepts. Automaton has 22602 states and 34253 transitions. Word has length 143 [2021-11-25 17:51:23,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:51:23,810 INFO L470 AbstractCegarLoop]: Abstraction has 22602 states and 34253 transitions. [2021-11-25 17:51:23,810 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.333333333333336) internal successors, (115), 2 states have internal predecessors, (115), 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) [2021-11-25 17:51:23,810 INFO L276 IsEmpty]: Start isEmpty. Operand 22602 states and 34253 transitions. [2021-11-25 17:51:23,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 17:51:23,856 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:51:23,856 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:51:23,893 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 17:51:24,071 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 17:51:24,071 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:51:24,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:51:24,072 INFO L85 PathProgramCache]: Analyzing trace with hash 1146719660, now seen corresponding path program 1 times [2021-11-25 17:51:24,072 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:51:24,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757566678] [2021-11-25 17:51:24,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:24,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:51:24,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:24,311 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 17:51:24,312 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:51:24,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757566678] [2021-11-25 17:51:24,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1757566678] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:51:24,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [234267319] [2021-11-25 17:51:24,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:24,312 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:51:24,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:51:24,315 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:51:24,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 17:51:24,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:24,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 1027 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 17:51:24,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:51:24,807 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 17:51:24,807 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:51:24,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [234267319] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:51:24,807 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:51:24,807 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 4 [2021-11-25 17:51:24,808 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206383850] [2021-11-25 17:51:24,808 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:51:24,808 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:51:24,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:51:24,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:51:24,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:51:24,810 INFO L87 Difference]: Start difference. First operand 22602 states and 34253 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 2 states have internal predecessors, (100), 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) [2021-11-25 17:51:26,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:51:26,349 INFO L93 Difference]: Finished difference Result 67411 states and 103766 transitions. [2021-11-25 17:51:26,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:51:26,349 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 2 states have internal predecessors, (100), 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 143 [2021-11-25 17:51:26,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:51:26,579 INFO L225 Difference]: With dead ends: 67411 [2021-11-25 17:51:26,580 INFO L226 Difference]: Without dead ends: 44814 [2021-11-25 17:51:26,650 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:51:26,651 INFO L933 BasicCegarLoop]: 280 mSDtfsCounter, 273 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 529 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:51:26,651 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [273 Valid, 529 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:51:26,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44814 states. [2021-11-25 17:51:28,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44814 to 44682. [2021-11-25 17:51:28,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44682 states, 38147 states have (on average 1.5066715600178258) internal successors, (57475), 38277 states have internal predecessors, (57475), 4998 states have call successors, (4998), 1537 states have call predecessors, (4998), 1536 states have return successors, (4996), 4868 states have call predecessors, (4996), 4996 states have call successors, (4996) [2021-11-25 17:51:28,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44682 states to 44682 states and 67469 transitions. [2021-11-25 17:51:28,954 INFO L78 Accepts]: Start accepts. Automaton has 44682 states and 67469 transitions. Word has length 143 [2021-11-25 17:51:28,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:51:28,955 INFO L470 AbstractCegarLoop]: Abstraction has 44682 states and 67469 transitions. [2021-11-25 17:51:28,955 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 2 states have internal predecessors, (100), 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) [2021-11-25 17:51:28,955 INFO L276 IsEmpty]: Start isEmpty. Operand 44682 states and 67469 transitions. [2021-11-25 17:51:29,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 17:51:29,187 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:51:29,187 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:51:29,235 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 17:51:29,411 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e5fb9dc-82dd-4029-ab8c-e090e9ded2d3/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:51:29,411 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:51:29,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:51:29,412 INFO L85 PathProgramCache]: Analyzing trace with hash 1447777130, now seen corresponding path program 1 times [2021-11-25 17:51:29,412 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:51:29,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926807645] [2021-11-25 17:51:29,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:29,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:51:29,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:29,592 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 17:51:29,592 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:51:29,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926807645] [2021-11-25 17:51:29,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [926807645] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:51:29,593 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:51:29,593 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 17:51:29,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190559963] [2021-11-25 17:51:29,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:51:29,596 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:51:29,596 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:51:29,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:51:29,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:51:29,597 INFO L87 Difference]: Start difference. First operand 44682 states and 67469 transitions. Second operand has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 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) [2021-11-25 17:51:33,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:51:33,659 INFO L93 Difference]: Finished difference Result 156818 states and 236308 transitions. [2021-11-25 17:51:33,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:51:33,660 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 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 143 [2021-11-25 17:51:33,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:51:34,534 INFO L225 Difference]: With dead ends: 156818 [2021-11-25 17:51:34,535 INFO L226 Difference]: Without dead ends: 112142 [2021-11-25 17:51:34,645 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:51:34,647 INFO L933 BasicCegarLoop]: 290 mSDtfsCounter, 1161 mSDsluCounter, 792 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1183 SdHoareTripleChecker+Valid, 949 SdHoareTripleChecker+Invalid, 559 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:51:34,648 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1183 Valid, 949 Invalid, 559 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [156 Valid, 403 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 17:51:34,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112142 states. [2021-11-25 17:51:39,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112142 to 87818. [2021-11-25 17:51:39,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87818 states, 75011 states have (on average 1.5016864193251656) internal successors, (112643), 75269 states have internal predecessors, (112643), 9734 states have call successors, (9734), 3073 states have call predecessors, (9734), 3072 states have return successors, (9732), 9476 states have call predecessors, (9732), 9732 states have call successors, (9732) [2021-11-25 17:51:39,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87818 states to 87818 states and 132109 transitions. [2021-11-25 17:51:39,954 INFO L78 Accepts]: Start accepts. Automaton has 87818 states and 132109 transitions. Word has length 143 [2021-11-25 17:51:39,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:51:39,958 INFO L470 AbstractCegarLoop]: Abstraction has 87818 states and 132109 transitions. [2021-11-25 17:51:39,958 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 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) [2021-11-25 17:51:39,959 INFO L276 IsEmpty]: Start isEmpty. Operand 87818 states and 132109 transitions. [2021-11-25 17:51:40,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-25 17:51:40,164 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:51:40,164 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:51:40,164 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 17:51:40,164 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:51:40,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:51:40,165 INFO L85 PathProgramCache]: Analyzing trace with hash 1418472926, now seen corresponding path program 1 times [2021-11-25 17:51:40,165 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:51:40,165 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2114349890] [2021-11-25 17:51:40,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:40,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:51:40,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:40,322 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 17:51:40,322 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:51:40,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2114349890] [2021-11-25 17:51:40,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2114349890] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:51:40,322 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:51:40,323 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 17:51:40,323 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779181485] [2021-11-25 17:51:40,323 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:51:40,324 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:51:40,324 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:51:40,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:51:40,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:51:40,325 INFO L87 Difference]: Start difference. First operand 87818 states and 132109 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 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) [2021-11-25 17:51:45,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:51:45,781 INFO L93 Difference]: Finished difference Result 241042 states and 362899 transitions. [2021-11-25 17:51:45,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:51:45,781 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 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 144 [2021-11-25 17:51:45,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:51:46,289 INFO L225 Difference]: With dead ends: 241042 [2021-11-25 17:51:46,290 INFO L226 Difference]: Without dead ends: 153230 [2021-11-25 17:51:46,481 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:51:46,482 INFO L933 BasicCegarLoop]: 275 mSDtfsCounter, 1026 mSDsluCounter, 917 mSDsCounter, 0 mSdLazyCounter, 412 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1032 SdHoareTripleChecker+Valid, 1044 SdHoareTripleChecker+Invalid, 580 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 412 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 17:51:46,482 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1032 Valid, 1044 Invalid, 580 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 412 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 17:51:46,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153230 states. [2021-11-25 17:51:51,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153230 to 130698. [2021-11-25 17:51:51,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130698 states, 111619 states have (on average 1.4976930450908896) internal successors, (167171), 112005 states have internal predecessors, (167171), 14470 states have call successors, (14470), 4609 states have call predecessors, (14470), 4608 states have return successors, (14468), 14084 states have call predecessors, (14468), 14468 states have call successors, (14468) [2021-11-25 17:51:52,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130698 states to 130698 states and 196109 transitions. [2021-11-25 17:51:52,677 INFO L78 Accepts]: Start accepts. Automaton has 130698 states and 196109 transitions. Word has length 144 [2021-11-25 17:51:52,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:51:52,678 INFO L470 AbstractCegarLoop]: Abstraction has 130698 states and 196109 transitions. [2021-11-25 17:51:52,678 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 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) [2021-11-25 17:51:52,678 INFO L276 IsEmpty]: Start isEmpty. Operand 130698 states and 196109 transitions. [2021-11-25 17:51:52,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-25 17:51:52,889 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:51:52,889 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:51:52,889 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 17:51:52,889 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:51:52,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:51:52,890 INFO L85 PathProgramCache]: Analyzing trace with hash 550468966, now seen corresponding path program 1 times [2021-11-25 17:51:52,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:51:52,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558260004] [2021-11-25 17:51:52,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:52,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:51:52,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:53,037 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 17:51:53,038 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:51:53,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558260004] [2021-11-25 17:51:53,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [558260004] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:51:53,038 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:51:53,038 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 17:51:53,039 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726583108] [2021-11-25 17:51:53,039 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:51:53,040 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:51:53,040 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:51:53,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:51:53,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:51:53,041 INFO L87 Difference]: Start difference. First operand 130698 states and 196109 transitions. Second operand has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 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) [2021-11-25 17:52:01,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:52:01,543 INFO L93 Difference]: Finished difference Result 356306 states and 535699 transitions. [2021-11-25 17:52:01,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:52:01,543 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 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 145 [2021-11-25 17:52:01,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted.