./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH --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 558f970b63375a18824a4471ce91e71e4e14632a20bfa5002df552fa8b202ea3 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-03 04:27:06,901 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-03 04:27:06,904 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-03 04:27:06,959 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-03 04:27:06,960 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-03 04:27:06,964 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-03 04:27:06,966 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-03 04:27:06,970 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-03 04:27:06,973 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-03 04:27:06,978 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-03 04:27:06,979 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-03 04:27:06,981 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-03 04:27:06,982 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-03 04:27:06,984 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-03 04:27:06,986 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-03 04:27:06,994 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-03 04:27:06,996 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-03 04:27:06,997 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-03 04:27:07,000 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-03 04:27:07,007 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-03 04:27:07,009 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-03 04:27:07,011 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-03 04:27:07,014 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-03 04:27:07,015 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-03 04:27:07,024 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-03 04:27:07,025 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-03 04:27:07,025 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-03 04:27:07,027 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-03 04:27:07,028 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-03 04:27:07,029 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-03 04:27:07,030 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-03 04:27:07,031 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-03 04:27:07,033 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-03 04:27:07,034 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-03 04:27:07,036 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-03 04:27:07,036 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-03 04:27:07,037 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-03 04:27:07,038 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-03 04:27:07,038 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-03 04:27:07,039 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-03 04:27:07,040 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-03 04:27:07,041 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-03 04:27:07,086 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-03 04:27:07,087 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-03 04:27:07,089 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-03 04:27:07,089 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-03 04:27:07,089 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-03 04:27:07,089 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-03 04:27:07,090 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-03 04:27:07,090 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-03 04:27:07,096 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-03 04:27:07,096 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-03 04:27:07,097 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-03 04:27:07,098 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-03 04:27:07,098 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-03 04:27:07,098 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-03 04:27:07,098 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-03 04:27:07,099 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-03 04:27:07,100 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-03 04:27:07,100 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-03 04:27:07,100 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-03 04:27:07,100 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-03 04:27:07,101 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-03 04:27:07,101 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-03 04:27:07,101 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-03 04:27:07,101 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-03 04:27:07,101 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-03 04:27:07,102 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-03 04:27:07,102 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-03 04:27:07,102 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-03 04:27:07,103 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-03 04:27:07,104 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-03 04:27:07,104 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 04:27:07,105 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-03 04:27:07,105 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-03 04:27:07,105 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-03 04:27:07,105 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-03 04:27:07,106 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-03 04:27:07,106 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-03 04:27:07,106 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-03 04:27:07,106 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-03 04:27:07,107 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_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 558f970b63375a18824a4471ce91e71e4e14632a20bfa5002df552fa8b202ea3 [2021-11-03 04:27:07,399 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-03 04:27:07,420 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-03 04:27:07,423 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-03 04:27:07,436 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-03 04:27:07,437 INFO L275 PluginConnector]: CDTParser initialized [2021-11-03 04:27:07,438 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH/../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.ufo.UNBOUNDED.pals.c [2021-11-03 04:27:07,515 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH/data/67247e2d9/4c5ac78de7ca4ab7910a688534363bf3/FLAGb86f0117e [2021-11-03 04:27:07,983 INFO L306 CDTParser]: Found 1 translation units. [2021-11-03 04:27:07,984 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.ufo.UNBOUNDED.pals.c [2021-11-03 04:27:07,995 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH/data/67247e2d9/4c5ac78de7ca4ab7910a688534363bf3/FLAGb86f0117e [2021-11-03 04:27:08,333 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH/data/67247e2d9/4c5ac78de7ca4ab7910a688534363bf3 [2021-11-03 04:27:08,336 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-03 04:27:08,337 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-03 04:27:08,354 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-03 04:27:08,354 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-03 04:27:08,357 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-03 04:27:08,357 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:27:08" (1/1) ... [2021-11-03 04:27:08,358 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@25e7246d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:27:08, skipping insertion in model container [2021-11-03 04:27:08,359 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:27:08" (1/1) ... [2021-11-03 04:27:08,365 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-03 04:27:08,403 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-03 04:27:08,681 WARN L228 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_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.ufo.UNBOUNDED.pals.c[14509,14522] [2021-11-03 04:27:08,684 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 04:27:08,694 INFO L203 MainTranslator]: Completed pre-run [2021-11-03 04:27:08,761 WARN L228 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_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.ufo.UNBOUNDED.pals.c[14509,14522] [2021-11-03 04:27:08,762 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 04:27:08,788 INFO L208 MainTranslator]: Completed translation [2021-11-03 04:27:08,790 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:27:08 WrapperNode [2021-11-03 04:27:08,790 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-03 04:27:08,792 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-03 04:27:08,792 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-03 04:27:08,792 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-03 04:27:08,801 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:27:08" (1/1) ... [2021-11-03 04:27:08,818 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:27:08" (1/1) ... [2021-11-03 04:27:08,873 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-03 04:27:08,874 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-03 04:27:08,874 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-03 04:27:08,874 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-03 04:27:08,890 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:27:08" (1/1) ... [2021-11-03 04:27:08,890 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:27:08" (1/1) ... [2021-11-03 04:27:08,895 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:27:08" (1/1) ... [2021-11-03 04:27:08,895 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:27:08" (1/1) ... [2021-11-03 04:27:08,911 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:27:08" (1/1) ... [2021-11-03 04:27:08,945 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:27:08" (1/1) ... [2021-11-03 04:27:08,948 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:27:08" (1/1) ... [2021-11-03 04:27:08,954 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-03 04:27:08,955 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-03 04:27:08,955 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-03 04:27:08,955 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-03 04:27:08,956 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:27:08" (1/1) ... [2021-11-03 04:27:08,964 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 04:27:08,994 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:27:09,023 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-03 04:27:09,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-03 04:27:09,065 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-03 04:27:09,065 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-03 04:27:09,065 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-03 04:27:09,065 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-03 04:27:11,904 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-03 04:27:11,905 INFO L299 CfgBuilder]: Removed 19 assume(true) statements. [2021-11-03 04:27:11,907 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:27:11 BoogieIcfgContainer [2021-11-03 04:27:11,907 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-03 04:27:11,909 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-03 04:27:11,909 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-03 04:27:11,912 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-03 04:27:11,913 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 04:27:08" (1/3) ... [2021-11-03 04:27:11,914 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f36ccb4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:27:11, skipping insertion in model container [2021-11-03 04:27:11,914 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:27:08" (2/3) ... [2021-11-03 04:27:11,915 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f36ccb4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:27:11, skipping insertion in model container [2021-11-03 04:27:11,915 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:27:11" (3/3) ... [2021-11-03 04:27:11,917 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.3.ufo.UNBOUNDED.pals.c [2021-11-03 04:27:11,922 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-03 04:27:11,923 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-03 04:27:11,986 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-03 04:27:11,998 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 [2021-11-03 04:27:11,999 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-03 04:27:12,013 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 16 states have (on average 1.8125) internal successors, (29), 17 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:12,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-03 04:27:12,018 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:27:12,019 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-03 04:27:12,020 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:27:12,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:27:12,032 INFO L85 PathProgramCache]: Analyzing trace with hash -2022557890, now seen corresponding path program 1 times [2021-11-03 04:27:12,049 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:27:12,050 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [314258316] [2021-11-03 04:27:12,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:27:12,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:27:12,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:27:13,033 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:13,034 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:27:13,034 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [314258316] [2021-11-03 04:27:13,035 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [314258316] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:27:13,035 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:27:13,035 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:27:13,037 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354548332] [2021-11-03 04:27:13,041 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:27:13,042 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:27:13,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:27:13,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:27:13,062 INFO L87 Difference]: Start difference. First operand has 18 states, 16 states have (on average 1.8125) internal successors, (29), 17 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:13,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:27:13,186 INFO L93 Difference]: Finished difference Result 51 states and 87 transitions. [2021-11-03 04:27:13,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:27:13,188 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-03 04:27:13,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:27:13,198 INFO L225 Difference]: With dead ends: 51 [2021-11-03 04:27:13,198 INFO L226 Difference]: Without dead ends: 34 [2021-11-03 04:27:13,200 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:27:13,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-03 04:27:13,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 25. [2021-11-03 04:27:13,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 24 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:13,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 40 transitions. [2021-11-03 04:27:13,235 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 40 transitions. Word has length 6 [2021-11-03 04:27:13,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:27:13,235 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 40 transitions. [2021-11-03 04:27:13,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:13,236 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 40 transitions. [2021-11-03 04:27:13,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-03 04:27:13,236 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:27:13,236 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:27:13,237 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-03 04:27:13,237 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:27:13,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:27:13,238 INFO L85 PathProgramCache]: Analyzing trace with hash 1662609203, now seen corresponding path program 1 times [2021-11-03 04:27:13,238 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:27:13,238 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224458956] [2021-11-03 04:27:13,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:27:13,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:27:13,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:27:13,529 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:13,529 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:27:13,529 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224458956] [2021-11-03 04:27:13,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [224458956] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:27:13,530 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:27:13,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:27:13,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66542458] [2021-11-03 04:27:13,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:27:13,532 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:27:13,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:27:13,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:27:13,533 INFO L87 Difference]: Start difference. First operand 25 states and 40 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:13,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:27:13,623 INFO L93 Difference]: Finished difference Result 54 states and 84 transitions. [2021-11-03 04:27:13,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:27:13,624 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-03 04:27:13,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:27:13,626 INFO L225 Difference]: With dead ends: 54 [2021-11-03 04:27:13,626 INFO L226 Difference]: Without dead ends: 36 [2021-11-03 04:27:13,627 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:27:13,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-03 04:27:13,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 25. [2021-11-03 04:27:13,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:13,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 39 transitions. [2021-11-03 04:27:13,632 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 39 transitions. Word has length 7 [2021-11-03 04:27:13,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:27:13,632 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 39 transitions. [2021-11-03 04:27:13,633 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:13,633 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 39 transitions. [2021-11-03 04:27:13,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-03 04:27:13,636 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:27:13,636 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:27:13,637 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-03 04:27:13,637 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:27:13,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:27:13,647 INFO L85 PathProgramCache]: Analyzing trace with hash -55876153, now seen corresponding path program 1 times [2021-11-03 04:27:13,647 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:27:13,647 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507227114] [2021-11-03 04:27:13,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:27:13,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:27:13,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:27:13,923 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:13,924 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:27:13,924 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507227114] [2021-11-03 04:27:13,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507227114] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:27:13,925 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:27:13,930 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:27:13,931 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852547762] [2021-11-03 04:27:13,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:27:13,931 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:27:13,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:27:13,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:27:13,934 INFO L87 Difference]: Start difference. First operand 25 states and 39 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:14,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:27:14,026 INFO L93 Difference]: Finished difference Result 54 states and 83 transitions. [2021-11-03 04:27:14,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:27:14,028 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-03 04:27:14,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:27:14,029 INFO L225 Difference]: With dead ends: 54 [2021-11-03 04:27:14,029 INFO L226 Difference]: Without dead ends: 36 [2021-11-03 04:27:14,029 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:27:14,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-03 04:27:14,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 25. [2021-11-03 04:27:14,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.5833333333333333) internal successors, (38), 24 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:14,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 38 transitions. [2021-11-03 04:27:14,035 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 38 transitions. Word has length 8 [2021-11-03 04:27:14,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:27:14,035 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 38 transitions. [2021-11-03 04:27:14,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:14,035 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 38 transitions. [2021-11-03 04:27:14,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-03 04:27:14,036 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:27:14,036 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:27:14,036 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-03 04:27:14,037 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:27:14,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:27:14,037 INFO L85 PathProgramCache]: Analyzing trace with hash -1783862884, now seen corresponding path program 1 times [2021-11-03 04:27:14,043 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:27:14,043 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [920713208] [2021-11-03 04:27:14,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:27:14,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:27:14,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:27:14,321 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:14,321 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:27:14,322 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [920713208] [2021-11-03 04:27:14,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [920713208] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:27:14,326 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:27:14,326 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:27:14,327 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099329218] [2021-11-03 04:27:14,327 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:27:14,327 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:27:14,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:27:14,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:27:14,329 INFO L87 Difference]: Start difference. First operand 25 states and 38 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:14,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:27:14,415 INFO L93 Difference]: Finished difference Result 54 states and 82 transitions. [2021-11-03 04:27:14,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:27:14,416 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-03 04:27:14,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:27:14,418 INFO L225 Difference]: With dead ends: 54 [2021-11-03 04:27:14,418 INFO L226 Difference]: Without dead ends: 36 [2021-11-03 04:27:14,420 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:27:14,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-03 04:27:14,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 25. [2021-11-03 04:27:14,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 24 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:14,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 37 transitions. [2021-11-03 04:27:14,427 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 37 transitions. Word has length 9 [2021-11-03 04:27:14,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:27:14,427 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 37 transitions. [2021-11-03 04:27:14,428 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:14,428 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 37 transitions. [2021-11-03 04:27:14,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-03 04:27:14,428 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:27:14,429 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:27:14,429 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-03 04:27:14,429 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:27:14,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:27:14,430 INFO L85 PathProgramCache]: Analyzing trace with hash -2072904668, now seen corresponding path program 1 times [2021-11-03 04:27:14,430 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:27:14,430 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [441652576] [2021-11-03 04:27:14,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:27:14,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:27:14,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:27:14,708 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:14,708 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:27:14,708 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [441652576] [2021-11-03 04:27:14,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [441652576] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:27:14,709 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:27:14,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:27:14,709 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085604001] [2021-11-03 04:27:14,709 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:27:14,709 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:27:14,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:27:14,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:27:14,710 INFO L87 Difference]: Start difference. First operand 25 states and 37 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:14,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:27:14,798 INFO L93 Difference]: Finished difference Result 52 states and 78 transitions. [2021-11-03 04:27:14,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:27:14,801 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-03 04:27:14,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:27:14,802 INFO L225 Difference]: With dead ends: 52 [2021-11-03 04:27:14,802 INFO L226 Difference]: Without dead ends: 34 [2021-11-03 04:27:14,802 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:27:14,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-03 04:27:14,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26. [2021-11-03 04:27:14,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.52) internal successors, (38), 25 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:14,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 38 transitions. [2021-11-03 04:27:14,807 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 38 transitions. Word has length 11 [2021-11-03 04:27:14,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:27:14,807 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 38 transitions. [2021-11-03 04:27:14,807 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:14,808 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 38 transitions. [2021-11-03 04:27:14,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-03 04:27:14,808 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:27:14,808 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:27:14,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-03 04:27:14,809 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:27:14,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:27:14,809 INFO L85 PathProgramCache]: Analyzing trace with hash 76566526, now seen corresponding path program 1 times [2021-11-03 04:27:14,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:27:14,810 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [637991561] [2021-11-03 04:27:14,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:27:14,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:27:14,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:27:15,077 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:15,080 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:27:15,080 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [637991561] [2021-11-03 04:27:15,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [637991561] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:27:15,081 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:27:15,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:27:15,082 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858794033] [2021-11-03 04:27:15,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:27:15,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:27:15,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:27:15,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:27:15,086 INFO L87 Difference]: Start difference. First operand 26 states and 38 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:15,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:27:15,153 INFO L93 Difference]: Finished difference Result 53 states and 79 transitions. [2021-11-03 04:27:15,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:27:15,153 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-03 04:27:15,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:27:15,154 INFO L225 Difference]: With dead ends: 53 [2021-11-03 04:27:15,154 INFO L226 Difference]: Without dead ends: 35 [2021-11-03 04:27:15,155 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:27:15,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-03 04:27:15,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2021-11-03 04:27:15,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.4444444444444444) internal successors, (39), 27 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:15,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2021-11-03 04:27:15,159 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 12 [2021-11-03 04:27:15,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:27:15,159 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2021-11-03 04:27:15,159 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:15,160 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2021-11-03 04:27:15,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-03 04:27:15,160 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:27:15,160 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:27:15,160 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-03 04:27:15,161 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:27:15,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:27:15,161 INFO L85 PathProgramCache]: Analyzing trace with hash 2080698436, now seen corresponding path program 1 times [2021-11-03 04:27:15,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:27:15,166 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505729726] [2021-11-03 04:27:15,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:27:15,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:27:15,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:27:15,395 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:15,395 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:27:15,395 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505729726] [2021-11-03 04:27:15,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [505729726] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:27:15,396 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:27:15,396 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:27:15,396 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607756920] [2021-11-03 04:27:15,396 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:27:15,397 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:27:15,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:27:15,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:27:15,398 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:15,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:27:15,458 INFO L93 Difference]: Finished difference Result 53 states and 76 transitions. [2021-11-03 04:27:15,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:27:15,459 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-03 04:27:15,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:27:15,459 INFO L225 Difference]: With dead ends: 53 [2021-11-03 04:27:15,459 INFO L226 Difference]: Without dead ends: 35 [2021-11-03 04:27:15,460 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:27:15,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-03 04:27:15,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 29. [2021-11-03 04:27:15,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:15,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 40 transitions. [2021-11-03 04:27:15,464 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 40 transitions. Word has length 14 [2021-11-03 04:27:15,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:27:15,465 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 40 transitions. [2021-11-03 04:27:15,465 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:15,465 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 40 transitions. [2021-11-03 04:27:15,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-03 04:27:15,466 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:27:15,466 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:27:15,466 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-03 04:27:15,467 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:27:15,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:27:15,467 INFO L85 PathProgramCache]: Analyzing trace with hash 66551515, now seen corresponding path program 1 times [2021-11-03 04:27:15,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:27:15,468 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120264726] [2021-11-03 04:27:15,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:27:15,468 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:27:15,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:27:15,561 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:15,561 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:27:15,561 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120264726] [2021-11-03 04:27:15,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [120264726] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:27:15,562 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:27:15,562 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-03 04:27:15,562 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577483268] [2021-11-03 04:27:15,563 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 04:27:15,563 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:27:15,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 04:27:15,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:27:15,564 INFO L87 Difference]: Start difference. First operand 29 states and 40 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:15,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:27:15,697 INFO L93 Difference]: Finished difference Result 73 states and 109 transitions. [2021-11-03 04:27:15,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-03 04:27:15,698 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-03 04:27:15,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:27:15,699 INFO L225 Difference]: With dead ends: 73 [2021-11-03 04:27:15,699 INFO L226 Difference]: Without dead ends: 55 [2021-11-03 04:27:15,699 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-03 04:27:15,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-03 04:27:15,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 32. [2021-11-03 04:27:15,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 31 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:15,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-11-03 04:27:15,705 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 15 [2021-11-03 04:27:15,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:27:15,705 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-11-03 04:27:15,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:15,705 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-11-03 04:27:15,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-03 04:27:15,706 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:27:15,706 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:27:15,706 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-03 04:27:15,707 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:27:15,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:27:15,707 INFO L85 PathProgramCache]: Analyzing trace with hash 1068873569, now seen corresponding path program 1 times [2021-11-03 04:27:15,707 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:27:15,708 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902868835] [2021-11-03 04:27:15,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:27:15,708 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:27:16,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:27:16,448 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:16,448 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:27:16,448 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902868835] [2021-11-03 04:27:16,448 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [902868835] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:27:16,449 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [343243209] [2021-11-03 04:27:16,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:27:16,453 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:27:16,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:27:16,455 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:27:16,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3b70c05-d399-496a-aa9f-c8cdbf97bfe9/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-03 04:27:16,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:27:16,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-03 04:27:16,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:27:35,408 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:35,408 INFO L328 TraceCheckSpWp]: Computing backward predicates...