./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/float-benchs/zonotope_3.c.p+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/float-benchs/zonotope_3.c.p+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P --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 f57f8b833105028fdf95b78a3cf338388755f00064f1be1e7a158d1da7dbd5a2 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:25:20,036 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:25:20,039 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:25:20,100 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:25:20,101 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:25:20,107 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:25:20,109 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:25:20,114 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:25:20,117 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:25:20,126 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:25:20,127 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:25:20,129 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:25:20,130 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:25:20,133 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:25:20,136 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:25:20,142 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:25:20,144 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:25:20,147 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:25:20,151 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:25:20,156 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:25:20,161 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:25:20,163 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:25:20,167 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:25:20,168 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:25:20,175 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:25:20,176 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:25:20,176 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:25:20,178 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:25:20,179 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:25:20,181 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:25:20,182 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:25:20,183 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:25:20,185 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:25:20,186 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:25:20,188 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:25:20,188 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:25:20,189 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:25:20,189 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:25:20,189 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:25:20,190 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:25:20,191 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:25:20,192 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:25:20,249 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:25:20,250 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:25:20,251 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:25:20,251 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:25:20,252 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:25:20,252 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:25:20,253 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:25:20,253 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:25:20,253 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:25:20,253 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:25:20,255 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:25:20,255 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:25:20,255 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:25:20,256 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:25:20,256 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:25:20,256 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:25:20,256 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:25:20,257 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:25:20,258 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:25:20,258 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:25:20,259 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:25:20,259 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:25:20,259 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:25:20,259 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:25:20,260 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:25:20,260 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:25:20,262 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:25:20,262 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:25:20,262 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:25:20,262 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:25:20,263 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:25:20,263 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:25:20,263 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:25:20,264 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:25:20,264 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:25:20,264 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:25:20,264 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:25:20,265 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:25:20,265 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:25:20,265 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:25:20,265 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:25:20,266 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_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f57f8b833105028fdf95b78a3cf338388755f00064f1be1e7a158d1da7dbd5a2 [2021-11-21 01:25:20,543 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:25:20,563 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:25:20,565 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:25:20,567 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:25:20,568 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:25:20,569 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/float-benchs/zonotope_3.c.p+cfa-reducer.c [2021-11-21 01:25:20,651 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/data/608b74455/09eeeb6a26a54053ba5ec0cceb64aa98/FLAG7fe88f8b1 [2021-11-21 01:25:21,217 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:25:21,218 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/sv-benchmarks/c/float-benchs/zonotope_3.c.p+cfa-reducer.c [2021-11-21 01:25:21,237 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/data/608b74455/09eeeb6a26a54053ba5ec0cceb64aa98/FLAG7fe88f8b1 [2021-11-21 01:25:21,545 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/data/608b74455/09eeeb6a26a54053ba5ec0cceb64aa98 [2021-11-21 01:25:21,552 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:25:21,556 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:25:21,561 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:25:21,561 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:25:21,566 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:25:21,567 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:25:21" (1/1) ... [2021-11-21 01:25:21,570 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f13ad6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:25:21, skipping insertion in model container [2021-11-21 01:25:21,571 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:25:21" (1/1) ... [2021-11-21 01:25:21,579 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:25:21,617 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:25:21,853 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_7566e4f2-b1b2-49e4-b4f9-282af9216db6/sv-benchmarks/c/float-benchs/zonotope_3.c.p+cfa-reducer.c[2717,2730] [2021-11-21 01:25:21,863 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:25:21,875 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:25:21,904 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_7566e4f2-b1b2-49e4-b4f9-282af9216db6/sv-benchmarks/c/float-benchs/zonotope_3.c.p+cfa-reducer.c[2717,2730] [2021-11-21 01:25:21,907 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:25:21,923 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:25:21,924 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:25:21 WrapperNode [2021-11-21 01:25:21,924 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:25:21,935 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:25:21,936 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:25:21,936 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:25:21,945 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:25:21" (1/1) ... [2021-11-21 01:25:21,957 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:25:21" (1/1) ... [2021-11-21 01:25:21,998 INFO L137 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 115 [2021-11-21 01:25:22,001 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:25:22,002 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:25:22,002 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:25:22,002 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:25:22,011 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:25:21" (1/1) ... [2021-11-21 01:25:22,011 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:25:21" (1/1) ... [2021-11-21 01:25:22,013 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:25:21" (1/1) ... [2021-11-21 01:25:22,013 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:25:21" (1/1) ... [2021-11-21 01:25:22,020 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:25:21" (1/1) ... [2021-11-21 01:25:22,023 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:25:21" (1/1) ... [2021-11-21 01:25:22,025 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:25:21" (1/1) ... [2021-11-21 01:25:22,027 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:25:22,033 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:25:22,034 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:25:22,034 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:25:22,035 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:25:21" (1/1) ... [2021-11-21 01:25:22,044 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:25:22,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:25:22,072 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:25:22,077 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:25:22,121 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:25:22,121 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:25:22,122 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:25:22,122 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:25:22,206 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:25:22,208 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:25:22,361 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:25:22,378 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:25:22,379 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-21 01:25:22,381 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:25:22 BoogieIcfgContainer [2021-11-21 01:25:22,382 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:25:22,384 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:25:22,384 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:25:22,388 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:25:22,388 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:25:21" (1/3) ... [2021-11-21 01:25:22,389 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@513cf612 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:25:22, skipping insertion in model container [2021-11-21 01:25:22,389 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:25:21" (2/3) ... [2021-11-21 01:25:22,389 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@513cf612 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:25:22, skipping insertion in model container [2021-11-21 01:25:22,390 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:25:22" (3/3) ... [2021-11-21 01:25:22,391 INFO L111 eAbstractionObserver]: Analyzing ICFG zonotope_3.c.p+cfa-reducer.c [2021-11-21 01:25:22,397 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:25:22,398 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:25:22,488 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:25:22,496 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 [2021-11-21 01:25:22,497 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:25:22,529 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 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) [2021-11-21 01:25:22,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 01:25:22,536 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:25:22,537 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:25:22,538 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:25:22,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:25:22,560 INFO L85 PathProgramCache]: Analyzing trace with hash 532985016, now seen corresponding path program 1 times [2021-11-21 01:25:22,570 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:25:22,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012839951] [2021-11-21 01:25:22,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:25:22,573 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:25:22,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:25:22,765 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:22,766 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:25:22,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2012839951] [2021-11-21 01:25:22,767 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2012839951] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:25:22,768 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:25:22,768 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:25:22,770 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932868011] [2021-11-21 01:25:22,771 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:25:22,776 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:25:22,776 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:25:22,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:25:22,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:25:22,828 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 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 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 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) [2021-11-21 01:25:22,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:25:22,900 INFO L93 Difference]: Finished difference Result 31 states and 42 transitions. [2021-11-21 01:25:22,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:25:22,906 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 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 [2021-11-21 01:25:22,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:25:22,915 INFO L225 Difference]: With dead ends: 31 [2021-11-21 01:25:22,915 INFO L226 Difference]: Without dead ends: 18 [2021-11-21 01:25:22,918 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:25:22,924 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 8 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:25:22,925 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 31 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:25:22,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-21 01:25:22,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 14. [2021-11-21 01:25:22,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 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) [2021-11-21 01:25:22,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 18 transitions. [2021-11-21 01:25:22,958 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 18 transitions. Word has length 7 [2021-11-21 01:25:22,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:25:22,959 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 18 transitions. [2021-11-21 01:25:22,959 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 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) [2021-11-21 01:25:22,959 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 18 transitions. [2021-11-21 01:25:22,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 01:25:22,960 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:25:22,960 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:25:22,961 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:25:22,961 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:25:22,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:25:22,963 INFO L85 PathProgramCache]: Analyzing trace with hash -1155032636, now seen corresponding path program 1 times [2021-11-21 01:25:22,963 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:25:22,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196358735] [2021-11-21 01:25:22,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:25:22,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:25:22,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:25:23,040 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:23,040 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:25:23,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196358735] [2021-11-21 01:25:23,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1196358735] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:25:23,041 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:25:23,041 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:25:23,042 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950003704] [2021-11-21 01:25:23,042 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:25:23,043 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:25:23,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:25:23,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:25:23,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:25:23,067 INFO L87 Difference]: Start difference. First operand 14 states and 18 transitions. Second operand has 3 states, 3 states have (on average 3.6666666666666665) 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) [2021-11-21 01:25:23,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:25:23,083 INFO L93 Difference]: Finished difference Result 27 states and 35 transitions. [2021-11-21 01:25:23,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:25:23,088 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) 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 [2021-11-21 01:25:23,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:25:23,089 INFO L225 Difference]: With dead ends: 27 [2021-11-21 01:25:23,089 INFO L226 Difference]: Without dead ends: 13 [2021-11-21 01:25:23,090 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:25:23,092 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:25:23,093 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:25:23,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-21 01:25:23,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-21 01:25:23,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 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) [2021-11-21 01:25:23,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2021-11-21 01:25:23,098 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 11 [2021-11-21 01:25:23,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:25:23,098 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2021-11-21 01:25:23,098 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) 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) [2021-11-21 01:25:23,099 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2021-11-21 01:25:23,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 01:25:23,099 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:25:23,100 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:25:23,100 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 01:25:23,100 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:25:23,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:25:23,109 INFO L85 PathProgramCache]: Analyzing trace with hash -61253633, now seen corresponding path program 1 times [2021-11-21 01:25:23,109 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:25:23,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461113284] [2021-11-21 01:25:23,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:25:23,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:25:23,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:25:23,207 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:23,208 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:25:23,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461113284] [2021-11-21 01:25:23,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [461113284] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:25:23,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1050819695] [2021-11-21 01:25:23,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:25:23,212 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:25:23,212 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:25:23,222 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:25:23,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:25:23,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:25:23,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:25:23,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:25:23,423 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:23,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:25:23,508 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:23,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1050819695] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:25:23,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1976097059] [2021-11-21 01:25:23,539 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-21 01:25:23,540 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:25:23,552 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:25:23,559 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:25:23,559 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:25:28,524 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:25:29,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1976097059] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:25:29,511 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:25:29,511 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 12 [2021-11-21 01:25:29,512 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206944920] [2021-11-21 01:25:29,512 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:25:29,513 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:25:29,513 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:25:29,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:25:29,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:25:29,515 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 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) [2021-11-21 01:25:30,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:25:30,101 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2021-11-21 01:25:30,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 01:25:30,101 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 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 [2021-11-21 01:25:30,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:25:30,102 INFO L225 Difference]: With dead ends: 17 [2021-11-21 01:25:30,102 INFO L226 Difference]: Without dead ends: 13 [2021-11-21 01:25:30,103 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:25:30,105 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 22 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:25:30,106 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 16 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:25:30,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-21 01:25:30,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-21 01:25:30,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 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) [2021-11-21 01:25:30,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-11-21 01:25:30,113 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2021-11-21 01:25:30,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:25:30,113 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-11-21 01:25:30,114 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 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) [2021-11-21 01:25:30,114 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-11-21 01:25:30,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 01:25:30,115 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:25:30,115 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:25:30,155 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:25:30,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:25:30,329 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:25:30,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:25:30,330 INFO L85 PathProgramCache]: Analyzing trace with hash -44242972, now seen corresponding path program 1 times [2021-11-21 01:25:30,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:25:30,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [757429614] [2021-11-21 01:25:30,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:25:30,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:25:30,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:25:30,375 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:30,376 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:25:30,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [757429614] [2021-11-21 01:25:30,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [757429614] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:25:30,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1993495024] [2021-11-21 01:25:30,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:25:30,377 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:25:30,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:25:30,389 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:25:30,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:25:30,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:25:30,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:25:30,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:25:30,505 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:30,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:25:30,551 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:30,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1993495024] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:25:30,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [197196685] [2021-11-21 01:25:30,556 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-21 01:25:30,556 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:25:30,556 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:25:30,557 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:25:30,557 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:25:35,098 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:25:35,945 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:25:35,945 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:25:35,945 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-21 01:25:35,945 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260083644] [2021-11-21 01:25:35,945 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:25:35,946 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:25:35,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:25:35,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:25:35,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:25:35,947 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 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) [2021-11-21 01:25:36,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:25:36,000 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2021-11-21 01:25:36,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:25:36,001 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 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 [2021-11-21 01:25:36,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:25:36,002 INFO L225 Difference]: With dead ends: 32 [2021-11-21 01:25:36,002 INFO L226 Difference]: Without dead ends: 25 [2021-11-21 01:25:36,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:25:36,004 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 18 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:25:36,004 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 30 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:25:36,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-21 01:25:36,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-11-21 01:25:36,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 24 states have internal predecessors, (26), 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) [2021-11-21 01:25:36,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2021-11-21 01:25:36,014 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 11 [2021-11-21 01:25:36,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:25:36,014 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2021-11-21 01:25:36,015 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 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) [2021-11-21 01:25:36,015 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2021-11-21 01:25:36,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-21 01:25:36,016 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:25:36,016 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:25:36,040 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:25:36,229 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:25:36,229 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:25:36,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:25:36,230 INFO L85 PathProgramCache]: Analyzing trace with hash 1495002297, now seen corresponding path program 2 times [2021-11-21 01:25:36,230 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:25:36,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065607067] [2021-11-21 01:25:36,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:25:36,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:25:36,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:25:36,329 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:36,329 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:25:36,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065607067] [2021-11-21 01:25:36,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1065607067] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:25:36,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1463934612] [2021-11-21 01:25:36,330 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:25:36,330 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:25:36,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:25:36,332 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:25:36,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:25:36,411 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 01:25:36,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:25:36,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:25:36,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:25:36,485 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:36,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:25:36,607 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:36,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1463934612] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:25:36,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1010738962] [2021-11-21 01:25:36,612 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-21 01:25:36,612 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:25:36,612 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:25:36,612 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:25:36,613 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:25:40,960 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:25:41,810 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:25:41,810 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:25:41,810 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-21 01:25:41,810 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441053984] [2021-11-21 01:25:41,810 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:25:41,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 01:25:41,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:25:41,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 01:25:41,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2021-11-21 01:25:41,812 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 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) [2021-11-21 01:25:41,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:25:41,873 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-11-21 01:25:41,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 01:25:41,874 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 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 23 [2021-11-21 01:25:41,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:25:41,875 INFO L225 Difference]: With dead ends: 56 [2021-11-21 01:25:41,875 INFO L226 Difference]: Without dead ends: 49 [2021-11-21 01:25:41,876 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2021-11-21 01:25:41,877 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 45 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:25:41,878 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 51 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:25:41,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-21 01:25:41,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-11-21 01:25:41,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 48 states have internal predecessors, (50), 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) [2021-11-21 01:25:41,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2021-11-21 01:25:41,892 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 23 [2021-11-21 01:25:41,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:25:41,893 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2021-11-21 01:25:41,893 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 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) [2021-11-21 01:25:41,893 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2021-11-21 01:25:41,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-21 01:25:41,895 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:25:41,895 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:25:41,925 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:25:42,105 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:25:42,105 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:25:42,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:25:42,106 INFO L85 PathProgramCache]: Analyzing trace with hash 429682659, now seen corresponding path program 3 times [2021-11-21 01:25:42,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:25:42,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1319540104] [2021-11-21 01:25:42,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:25:42,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:25:42,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:25:42,364 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:42,364 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:25:42,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1319540104] [2021-11-21 01:25:42,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1319540104] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:25:42,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674334744] [2021-11-21 01:25:42,365 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:25:42,366 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:25:42,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:25:42,369 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:25:42,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:25:42,482 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:25:42,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:25:42,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 412 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 01:25:42,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:25:42,593 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:42,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:25:42,857 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:42,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [674334744] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:25:42,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [379505104] [2021-11-21 01:25:42,860 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-21 01:25:42,860 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:25:42,861 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:25:42,861 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:25:42,861 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:25:46,968 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:25:47,935 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:25:47,936 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:25:47,936 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2021-11-21 01:25:47,936 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960525143] [2021-11-21 01:25:47,936 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:25:47,937 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 01:25:47,937 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:25:47,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 01:25:47,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=604, Unknown=0, NotChecked=0, Total=930 [2021-11-21 01:25:47,938 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand has 25 states, 25 states have (on average 3.76) internal successors, (94), 24 states have internal predecessors, (94), 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) [2021-11-21 01:25:48,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:25:48,085 INFO L93 Difference]: Finished difference Result 104 states and 117 transitions. [2021-11-21 01:25:48,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-21 01:25:48,086 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.76) internal successors, (94), 24 states have internal predecessors, (94), 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 47 [2021-11-21 01:25:48,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:25:48,093 INFO L225 Difference]: With dead ends: 104 [2021-11-21 01:25:48,095 INFO L226 Difference]: Without dead ends: 97 [2021-11-21 01:25:48,096 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 121 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 281 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=326, Invalid=604, Unknown=0, NotChecked=0, Total=930 [2021-11-21 01:25:48,102 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 66 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:25:48,103 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 82 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:25:48,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-21 01:25:48,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2021-11-21 01:25:48,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.0208333333333333) internal successors, (98), 96 states have internal predecessors, (98), 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) [2021-11-21 01:25:48,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2021-11-21 01:25:48,135 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 47 [2021-11-21 01:25:48,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:25:48,136 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2021-11-21 01:25:48,137 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.76) internal successors, (94), 24 states have internal predecessors, (94), 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) [2021-11-21 01:25:48,137 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2021-11-21 01:25:48,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-21 01:25:48,141 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:25:48,141 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:25:48,184 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:25:48,369 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:25:48,369 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:25:48,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:25:48,369 INFO L85 PathProgramCache]: Analyzing trace with hash -665691081, now seen corresponding path program 4 times [2021-11-21 01:25:48,369 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:25:48,370 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [720100305] [2021-11-21 01:25:48,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:25:48,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:25:48,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:25:48,792 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:48,792 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:25:48,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [720100305] [2021-11-21 01:25:48,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [720100305] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:25:48,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110022880] [2021-11-21 01:25:48,793 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:25:48,793 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:25:48,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:25:48,796 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:25:48,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:25:48,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:25:48,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 820 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 01:25:48,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:25:49,236 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:49,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:25:50,023 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:50,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110022880] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:25:50,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2134091620] [2021-11-21 01:25:50,026 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-21 01:25:50,026 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:25:50,026 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:25:50,027 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:25:50,027 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:25:53,761 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:25:54,805 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:25:54,806 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:25:54,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2021-11-21 01:25:54,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463012158] [2021-11-21 01:25:54,806 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:25:54,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-21 01:25:54,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:25:54,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-21 01:25:54,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1202, Invalid=1768, Unknown=0, NotChecked=0, Total=2970 [2021-11-21 01:25:54,811 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand has 49 states, 49 states have (on average 3.877551020408163) internal successors, (190), 48 states have internal predecessors, (190), 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) [2021-11-21 01:25:55,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:25:55,063 INFO L93 Difference]: Finished difference Result 200 states and 225 transitions. [2021-11-21 01:25:55,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-21 01:25:55,065 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.877551020408163) internal successors, (190), 48 states have internal predecessors, (190), 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 95 [2021-11-21 01:25:55,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:25:55,073 INFO L225 Difference]: With dead ends: 200 [2021-11-21 01:25:55,074 INFO L226 Difference]: Without dead ends: 193 [2021-11-21 01:25:55,076 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 253 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 581 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1202, Invalid=1768, Unknown=0, NotChecked=0, Total=2970 [2021-11-21 01:25:55,079 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 207 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:25:55,079 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 142 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:25:55,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-11-21 01:25:55,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 193. [2021-11-21 01:25:55,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 192 states have (on average 1.0104166666666667) internal successors, (194), 192 states have internal predecessors, (194), 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) [2021-11-21 01:25:55,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 194 transitions. [2021-11-21 01:25:55,142 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 194 transitions. Word has length 95 [2021-11-21 01:25:55,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:25:55,143 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 194 transitions. [2021-11-21 01:25:55,144 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 3.877551020408163) internal successors, (190), 48 states have internal predecessors, (190), 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) [2021-11-21 01:25:55,144 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 194 transitions. [2021-11-21 01:25:55,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-11-21 01:25:55,148 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:25:55,149 INFO L514 BasicCegarLoop]: trace histogram [46, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:25:55,194 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:25:55,368 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:25:55,369 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:25:55,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:25:55,369 INFO L85 PathProgramCache]: Analyzing trace with hash 988400863, now seen corresponding path program 5 times [2021-11-21 01:25:55,369 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:25:55,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1978807974] [2021-11-21 01:25:55,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:25:55,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:25:55,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:25:56,763 INFO L134 CoverageAnalysis]: Checked inductivity of 4186 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:56,763 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:25:56,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1978807974] [2021-11-21 01:25:56,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1978807974] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:25:56,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1197306688] [2021-11-21 01:25:56,764 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:25:56,764 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:25:56,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:25:56,766 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:25:56,785 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:25:57,225 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2021-11-21 01:25:57,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:25:57,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 1636 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-21 01:25:57,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:25:57,764 INFO L134 CoverageAnalysis]: Checked inductivity of 4186 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:25:57,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:26:00,625 INFO L134 CoverageAnalysis]: Checked inductivity of 4186 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:26:00,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1197306688] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:26:00,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1125266791] [2021-11-21 01:26:00,628 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-21 01:26:00,628 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:26:00,628 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:26:00,628 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:26:00,628 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:26:03,913 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:26:04,975 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:26:04,975 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:26:04,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 96 [2021-11-21 01:26:04,975 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6123076] [2021-11-21 01:26:04,975 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:26:04,976 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-21 01:26:04,977 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:04,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-21 01:26:04,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4682, Invalid=5824, Unknown=0, NotChecked=0, Total=10506 [2021-11-21 01:26:04,982 INFO L87 Difference]: Start difference. First operand 193 states and 194 transitions. Second operand has 97 states, 97 states have (on average 3.9381443298969074) internal successors, (382), 96 states have internal predecessors, (382), 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) [2021-11-21 01:26:05,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:05,406 INFO L93 Difference]: Finished difference Result 392 states and 441 transitions. [2021-11-21 01:26:05,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-21 01:26:05,406 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 3.9381443298969074) internal successors, (382), 96 states have internal predecessors, (382), 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 191 [2021-11-21 01:26:05,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:05,409 INFO L225 Difference]: With dead ends: 392 [2021-11-21 01:26:05,410 INFO L226 Difference]: Without dead ends: 385 [2021-11-21 01:26:05,413 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 619 GetRequests, 517 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1181 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=4682, Invalid=5824, Unknown=0, NotChecked=0, Total=10506 [2021-11-21 01:26:05,414 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 282 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 282 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:05,414 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [282 Valid, 226 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 196 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:26:05,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2021-11-21 01:26:05,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 385. [2021-11-21 01:26:05,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 384 states have (on average 1.0052083333333333) internal successors, (386), 384 states have internal predecessors, (386), 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) [2021-11-21 01:26:05,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 386 transitions. [2021-11-21 01:26:05,498 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 386 transitions. Word has length 191 [2021-11-21 01:26:05,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:05,499 INFO L470 AbstractCegarLoop]: Abstraction has 385 states and 386 transitions. [2021-11-21 01:26:05,499 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 3.9381443298969074) internal successors, (382), 96 states have internal predecessors, (382), 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) [2021-11-21 01:26:05,499 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 386 transitions. [2021-11-21 01:26:05,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 384 [2021-11-21 01:26:05,509 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:05,509 INFO L514 BasicCegarLoop]: trace histogram [94, 94, 94, 94, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:26:05,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:26:05,735 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-21 01:26:05,735 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:05,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:05,736 INFO L85 PathProgramCache]: Analyzing trace with hash 394726959, now seen corresponding path program 6 times [2021-11-21 01:26:05,736 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:05,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834126497] [2021-11-21 01:26:05,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:05,736 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:05,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:09,386 INFO L134 CoverageAnalysis]: Checked inductivity of 17578 backedges. 0 proven. 17578 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:26:09,386 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:09,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834126497] [2021-11-21 01:26:09,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1834126497] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:26:09,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [465082581] [2021-11-21 01:26:09,387 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:26:09,387 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:09,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:09,388 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:26:09,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:26:09,902 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:26:09,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:26:09,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 3268 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-21 01:26:09,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:26:10,799 INFO L134 CoverageAnalysis]: Checked inductivity of 17578 backedges. 0 proven. 17578 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:26:10,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:26:20,097 INFO L134 CoverageAnalysis]: Checked inductivity of 17578 backedges. 0 proven. 17578 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:26:20,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [465082581] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:26:20,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1897441292] [2021-11-21 01:26:20,100 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-21 01:26:20,100 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:26:20,101 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:26:20,101 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:26:20,101 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:26:24,072 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:26:25,502 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:26:25,502 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:26:25,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 192 [2021-11-21 01:26:25,503 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329618397] [2021-11-21 01:26:25,503 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:26:25,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2021-11-21 01:26:25,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:25,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2021-11-21 01:26:25,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18554, Invalid=20848, Unknown=0, NotChecked=0, Total=39402 [2021-11-21 01:26:25,521 INFO L87 Difference]: Start difference. First operand 385 states and 386 transitions. Second operand has 193 states, 193 states have (on average 3.9689119170984455) internal successors, (766), 192 states have internal predecessors, (766), 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) [2021-11-21 01:26:27,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:27,117 INFO L93 Difference]: Finished difference Result 776 states and 873 transitions. [2021-11-21 01:26:27,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2021-11-21 01:26:27,118 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 3.9689119170984455) internal successors, (766), 192 states have internal predecessors, (766), 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 383 [2021-11-21 01:26:27,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:27,124 INFO L225 Difference]: With dead ends: 776 [2021-11-21 01:26:27,124 INFO L226 Difference]: Without dead ends: 769 [2021-11-21 01:26:27,130 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1243 GetRequests, 1045 SyntacticMatches, 1 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2381 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=18554, Invalid=20848, Unknown=0, NotChecked=0, Total=39402 [2021-11-21 01:26:27,131 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 855 mSDsluCounter, 441 mSDsCounter, 0 mSdLazyCounter, 391 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 855 SdHoareTripleChecker+Valid, 451 SdHoareTripleChecker+Invalid, 495 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 391 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:27,132 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [855 Valid, 451 Invalid, 495 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 391 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:26:27,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 769 states. [2021-11-21 01:26:27,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 769 to 769. [2021-11-21 01:26:27,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 769 states, 768 states have (on average 1.0026041666666667) internal successors, (770), 768 states have internal predecessors, (770), 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) [2021-11-21 01:26:27,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 769 states to 769 states and 770 transitions. [2021-11-21 01:26:27,236 INFO L78 Accepts]: Start accepts. Automaton has 769 states and 770 transitions. Word has length 383 [2021-11-21 01:26:27,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:27,238 INFO L470 AbstractCegarLoop]: Abstraction has 769 states and 770 transitions. [2021-11-21 01:26:27,238 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 3.9689119170984455) internal successors, (766), 192 states have internal predecessors, (766), 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) [2021-11-21 01:26:27,238 INFO L276 IsEmpty]: Start isEmpty. Operand 769 states and 770 transitions. [2021-11-21 01:26:27,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 768 [2021-11-21 01:26:27,265 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:27,266 INFO L514 BasicCegarLoop]: trace histogram [190, 190, 190, 190, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:26:27,303 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:26:27,493 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:27,493 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:27,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:27,494 INFO L85 PathProgramCache]: Analyzing trace with hash 1148915919, now seen corresponding path program 7 times [2021-11-21 01:26:27,494 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:27,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [25155595] [2021-11-21 01:26:27,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:27,494 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:27,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:40,684 INFO L134 CoverageAnalysis]: Checked inductivity of 72010 backedges. 0 proven. 72010 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:26:40,684 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:40,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [25155595] [2021-11-21 01:26:40,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [25155595] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:26:40,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1901708627] [2021-11-21 01:26:40,685 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:26:40,685 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:40,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:40,706 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:26:40,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:26:41,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:41,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 6532 conjuncts, 192 conjunts are in the unsatisfiable core [2021-11-21 01:26:41,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:26:43,351 INFO L134 CoverageAnalysis]: Checked inductivity of 72010 backedges. 0 proven. 72010 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:26:43,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:20,584 INFO L134 CoverageAnalysis]: Checked inductivity of 72010 backedges. 0 proven. 72010 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:20,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1901708627] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:20,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1853572929] [2021-11-21 01:27:20,586 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-21 01:27:20,586 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:20,587 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:20,587 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:20,587 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:25,272 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:27,499 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:27,499 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:27,500 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [192, 192, 192] total 384 [2021-11-21 01:27:27,500 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166604411] [2021-11-21 01:27:27,500 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:27,503 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 385 states [2021-11-21 01:27:27,503 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:27,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 385 interpolants. [2021-11-21 01:27:27,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73946, Invalid=78544, Unknown=0, NotChecked=0, Total=152490 [2021-11-21 01:27:27,536 INFO L87 Difference]: Start difference. First operand 769 states and 770 transitions. Second operand has 385 states, 385 states have (on average 3.9844155844155846) internal successors, (1534), 384 states have internal predecessors, (1534), 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) [2021-11-21 01:27:34,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:34,244 INFO L93 Difference]: Finished difference Result 1544 states and 1737 transitions. [2021-11-21 01:27:34,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 384 states. [2021-11-21 01:27:34,246 INFO L78 Accepts]: Start accepts. Automaton has has 385 states, 385 states have (on average 3.9844155844155846) internal successors, (1534), 384 states have internal predecessors, (1534), 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 767 [2021-11-21 01:27:34,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:34,255 INFO L225 Difference]: With dead ends: 1544 [2021-11-21 01:27:34,255 INFO L226 Difference]: Without dead ends: 1537 [2021-11-21 01:27:34,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2491 GetRequests, 2101 SyntacticMatches, 1 SemanticMatches, 389 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4781 ImplicationChecksByTransitivity, 49.6s TimeCoverageRelationStatistics Valid=73946, Invalid=78544, Unknown=0, NotChecked=0, Total=152490 [2021-11-21 01:27:34,265 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 1146 mSDsluCounter, 818 mSDsCounter, 0 mSdLazyCounter, 774 mSolverCounterSat, 197 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1146 SdHoareTripleChecker+Valid, 828 SdHoareTripleChecker+Invalid, 971 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 197 IncrementalHoareTripleChecker+Valid, 774 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:34,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1146 Valid, 828 Invalid, 971 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [197 Valid, 774 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-21 01:27:34,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1537 states. [2021-11-21 01:27:34,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1537 to 1537. [2021-11-21 01:27:34,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1537 states, 1536 states have (on average 1.0013020833333333) internal successors, (1538), 1536 states have internal predecessors, (1538), 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) [2021-11-21 01:27:34,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1537 states to 1537 states and 1538 transitions. [2021-11-21 01:27:34,510 INFO L78 Accepts]: Start accepts. Automaton has 1537 states and 1538 transitions. Word has length 767 [2021-11-21 01:27:34,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:34,511 INFO L470 AbstractCegarLoop]: Abstraction has 1537 states and 1538 transitions. [2021-11-21 01:27:34,513 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 385 states, 385 states have (on average 3.9844155844155846) internal successors, (1534), 384 states have internal predecessors, (1534), 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) [2021-11-21 01:27:34,513 INFO L276 IsEmpty]: Start isEmpty. Operand 1537 states and 1538 transitions. [2021-11-21 01:27:34,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1536 [2021-11-21 01:27:34,532 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:34,532 INFO L514 BasicCegarLoop]: trace histogram [382, 382, 382, 382, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:27:34,565 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:34,737 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:34,740 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:34,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:34,741 INFO L85 PathProgramCache]: Analyzing trace with hash 491329039, now seen corresponding path program 8 times [2021-11-21 01:27:34,741 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:34,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699662164] [2021-11-21 01:27:34,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:34,741 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:35,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:26,419 INFO L134 CoverageAnalysis]: Checked inductivity of 291466 backedges. 0 proven. 291466 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:28:26,419 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:28:26,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699662164] [2021-11-21 01:28:26,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699662164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:28:26,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2040509376] [2021-11-21 01:28:26,419 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:28:26,419 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:26,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:28:26,420 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:28:26,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:28:36,864 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 383 check-sat command(s) [2021-11-21 01:28:36,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:28:36,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 13060 conjuncts, 384 conjunts are in the unsatisfiable core [2021-11-21 01:28:36,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:28:40,838 INFO L134 CoverageAnalysis]: Checked inductivity of 291466 backedges. 0 proven. 291466 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:28:40,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:31:09,768 INFO L134 CoverageAnalysis]: Checked inductivity of 291466 backedges. 0 proven. 291466 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:31:09,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2040509376] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:31:09,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [77924053] [2021-11-21 01:31:09,772 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-21 01:31:09,772 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:31:09,772 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:31:09,773 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:31:09,773 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:31:14,107 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:31:17,764 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:31:17,764 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:31:17,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [384, 384, 384] total 768 [2021-11-21 01:31:17,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511752970] [2021-11-21 01:31:17,765 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:31:17,770 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 769 states [2021-11-21 01:31:17,770 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:31:17,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 769 interpolants. [2021-11-21 01:31:17,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=295322, Invalid=304528, Unknown=0, NotChecked=0, Total=599850 [2021-11-21 01:31:17,850 INFO L87 Difference]: Start difference. First operand 1537 states and 1538 transitions. Second operand has 769 states, 769 states have (on average 3.9921976592977892) internal successors, (3070), 768 states have internal predecessors, (3070), 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) [2021-11-21 01:32:05,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:32:05,519 INFO L93 Difference]: Finished difference Result 3080 states and 3465 transitions. [2021-11-21 01:32:05,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 768 states. [2021-11-21 01:32:05,522 INFO L78 Accepts]: Start accepts. Automaton has has 769 states, 769 states have (on average 3.9921976592977892) internal successors, (3070), 768 states have internal predecessors, (3070), 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 1535 [2021-11-21 01:32:05,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:32:05,544 INFO L225 Difference]: With dead ends: 3080 [2021-11-21 01:32:05,544 INFO L226 Difference]: Without dead ends: 3073 [2021-11-21 01:32:05,589 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4987 GetRequests, 4213 SyntacticMatches, 1 SemanticMatches, 773 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9581 ImplicationChecksByTransitivity, 197.2s TimeCoverageRelationStatistics Valid=295322, Invalid=304528, Unknown=0, NotChecked=0, Total=599850 [2021-11-21 01:32:05,590 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 3447 mSDsluCounter, 1574 mSDsCounter, 0 mSdLazyCounter, 1542 mSolverCounterSat, 391 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3447 SdHoareTripleChecker+Valid, 1584 SdHoareTripleChecker+Invalid, 1933 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 391 IncrementalHoareTripleChecker+Valid, 1542 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-21 01:32:05,590 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3447 Valid, 1584 Invalid, 1933 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [391 Valid, 1542 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-21 01:32:05,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3073 states. [2021-11-21 01:32:06,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3073 to 3073. [2021-11-21 01:32:06,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3073 states, 3072 states have (on average 1.0006510416666667) internal successors, (3074), 3072 states have internal predecessors, (3074), 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) [2021-11-21 01:32:06,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3073 states to 3073 states and 3074 transitions. [2021-11-21 01:32:06,018 INFO L78 Accepts]: Start accepts. Automaton has 3073 states and 3074 transitions. Word has length 1535 [2021-11-21 01:32:06,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:32:06,021 INFO L470 AbstractCegarLoop]: Abstraction has 3073 states and 3074 transitions. [2021-11-21 01:32:06,024 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 769 states, 769 states have (on average 3.9921976592977892) internal successors, (3070), 768 states have internal predecessors, (3070), 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) [2021-11-21 01:32:06,024 INFO L276 IsEmpty]: Start isEmpty. Operand 3073 states and 3074 transitions. [2021-11-21 01:32:06,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3072 [2021-11-21 01:32:06,098 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:32:06,100 INFO L514 BasicCegarLoop]: trace histogram [766, 766, 766, 766, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:32:06,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 01:32:06,325 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:32:06,325 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:32:06,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:32:06,326 INFO L85 PathProgramCache]: Analyzing trace with hash 1249714319, now seen corresponding path program 9 times [2021-11-21 01:32:06,326 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:32:06,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [669573940] [2021-11-21 01:32:06,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:32:06,327 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:32:10,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:35:39,824 INFO L134 CoverageAnalysis]: Checked inductivity of 1172746 backedges. 0 proven. 1172746 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:35:39,825 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:35:39,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [669573940] [2021-11-21 01:35:39,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [669573940] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:35:39,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [654898718] [2021-11-21 01:35:39,825 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:35:39,825 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:35:39,826 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:35:39,826 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:35:39,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7566e4f2-b1b2-49e4-b4f9-282af9216db6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 01:35:44,024 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:35:44,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:35:44,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 26116 conjuncts, 768 conjunts are in the unsatisfiable core [2021-11-21 01:35:44,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:35:51,001 INFO L134 CoverageAnalysis]: Checked inductivity of 1172746 backedges. 0 proven. 1172746 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:35:51,001 INFO L328 TraceCheckSpWp]: Computing backward predicates...