./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrncat-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/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_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrncat-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d8697c629a22dee8b5a51c26261db89d3e1115a5e0c1bc03fd54c09ffc3b9b0d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:19:21,980 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:19:21,983 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:19:22,031 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:19:22,032 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:19:22,037 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:19:22,039 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:19:22,042 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:19:22,045 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:19:22,050 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:19:22,051 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:19:22,053 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:19:22,053 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:19:22,056 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:19:22,059 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:19:22,063 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:19:22,065 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:19:22,066 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:19:22,068 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:19:22,076 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:19:22,078 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:19:22,079 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:19:22,082 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:19:22,083 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:19:22,087 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:19:22,087 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:19:22,088 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:19:22,089 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:19:22,090 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:19:22,091 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:19:22,092 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:19:22,093 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:19:22,095 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:19:22,096 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:19:22,098 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:19:22,098 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:19:22,099 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:19:22,099 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:19:22,099 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:19:22,100 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:19:22,101 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:19:22,102 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-20 23:19:22,146 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:19:22,148 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:19:22,149 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:19:22,149 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:19:22,150 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:19:22,150 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:19:22,150 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:19:22,151 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:19:22,151 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:19:22,151 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:19:22,152 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:19:22,152 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:19:22,153 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:19:22,153 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:19:22,153 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:19:22,153 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:19:22,153 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:19:22,154 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:19:22,154 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-20 23:19:22,155 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-20 23:19:22,155 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:19:22,155 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:19:22,155 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-20 23:19:22,157 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:19:22,157 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:19:22,157 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:19:22,158 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-20 23:19:22,158 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-20 23:19:22,158 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-20 23:19:22,158 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:19:22,159 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-20 23:19:22,159 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:19:22,159 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:19:22,159 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:19:22,160 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:19:22,160 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:19:22,160 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:19:22,160 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:19:22,160 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:19:22,161 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:19:22,161 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:19:22,161 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:19:22,161 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_6100583e-b2fd-4f3e-9f23-a57ae808041d/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d8697c629a22dee8b5a51c26261db89d3e1115a5e0c1bc03fd54c09ffc3b9b0d [2021-11-20 23:19:22,458 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:19:22,478 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:19:22,480 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:19:22,482 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:19:22,482 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:19:22,484 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-memsafety/cstrncat-alloca-2.i [2021-11-20 23:19:22,544 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/data/6d5db4476/074fd14bc99a4af384570fb850c318b2/FLAG8100eec42 [2021-11-20 23:19:23,031 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:19:23,031 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/sv-benchmarks/c/array-memsafety/cstrncat-alloca-2.i [2021-11-20 23:19:23,055 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/data/6d5db4476/074fd14bc99a4af384570fb850c318b2/FLAG8100eec42 [2021-11-20 23:19:23,561 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/data/6d5db4476/074fd14bc99a4af384570fb850c318b2 [2021-11-20 23:19:23,563 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:19:23,565 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:19:23,574 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:19:23,574 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:19:23,578 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:19:23,579 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:19:23" (1/1) ... [2021-11-20 23:19:23,580 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e75783a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:23, skipping insertion in model container [2021-11-20 23:19:23,580 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:19:23" (1/1) ... [2021-11-20 23:19:23,593 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:19:23,633 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:19:24,042 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:19:24,051 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:19:24,111 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:19:24,146 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:19:24,146 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:24 WrapperNode [2021-11-20 23:19:24,147 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:19:24,148 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:19:24,148 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:19:24,148 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:19:24,156 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:24" (1/1) ... [2021-11-20 23:19:24,185 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:24" (1/1) ... [2021-11-20 23:19:24,219 INFO L137 Inliner]: procedures = 117, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 107 [2021-11-20 23:19:24,220 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:19:24,221 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:19:24,221 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:19:24,221 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:19:24,229 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:24" (1/1) ... [2021-11-20 23:19:24,230 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:24" (1/1) ... [2021-11-20 23:19:24,244 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:24" (1/1) ... [2021-11-20 23:19:24,246 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:24" (1/1) ... [2021-11-20 23:19:24,261 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:24" (1/1) ... [2021-11-20 23:19:24,265 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:24" (1/1) ... [2021-11-20 23:19:24,266 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:24" (1/1) ... [2021-11-20 23:19:24,269 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:19:24,270 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:19:24,270 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:19:24,270 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:19:24,271 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:24" (1/1) ... [2021-11-20 23:19:24,280 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:19:24,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:24,305 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:19:24,332 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:19:24,346 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 23:19:24,346 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 23:19:24,346 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 23:19:24,347 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 23:19:24,347 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:19:24,347 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:19:24,434 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:19:24,436 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:19:24,631 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:19:24,676 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:19:24,676 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-20 23:19:24,679 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:19:24 BoogieIcfgContainer [2021-11-20 23:19:24,679 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:19:24,681 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:19:24,681 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:19:24,684 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:19:24,684 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:19:23" (1/3) ... [2021-11-20 23:19:24,685 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cd2e4ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:19:24, skipping insertion in model container [2021-11-20 23:19:24,685 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:24" (2/3) ... [2021-11-20 23:19:24,686 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cd2e4ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:19:24, skipping insertion in model container [2021-11-20 23:19:24,686 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:19:24" (3/3) ... [2021-11-20 23:19:24,687 INFO L111 eAbstractionObserver]: Analyzing ICFG cstrncat-alloca-2.i [2021-11-20 23:19:24,692 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:19:24,692 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 19 error locations. [2021-11-20 23:19:24,761 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:19:24,768 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2021-11-20 23:19:24,768 INFO L340 AbstractCegarLoop]: Starting to check reachability of 19 error locations. [2021-11-20 23:19:24,782 INFO L276 IsEmpty]: Start isEmpty. Operand has 40 states, 20 states have (on average 2.4) internal successors, (48), 39 states have internal predecessors, (48), 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) [2021-11-20 23:19:24,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-20 23:19:24,789 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:24,789 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-20 23:19:24,790 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:24,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:24,796 INFO L85 PathProgramCache]: Analyzing trace with hash 169012, now seen corresponding path program 1 times [2021-11-20 23:19:24,805 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:24,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110485700] [2021-11-20 23:19:24,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:24,807 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:24,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:24,986 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:24,986 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:24,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110485700] [2021-11-20 23:19:24,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [110485700] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:19:24,987 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:19:24,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-20 23:19:24,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43434331] [2021-11-20 23:19:24,990 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:19:24,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:19:24,995 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:25,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:19:25,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:19:25,036 INFO L87 Difference]: Start difference. First operand has 40 states, 20 states have (on average 2.4) internal successors, (48), 39 states have internal predecessors, (48), 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, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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) [2021-11-20 23:19:25,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:25,098 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2021-11-20 23:19:25,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:19:25,108 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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 3 [2021-11-20 23:19:25,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:25,119 INFO L225 Difference]: With dead ends: 41 [2021-11-20 23:19:25,119 INFO L226 Difference]: Without dead ends: 39 [2021-11-20 23:19:25,122 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:19:25,128 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 1 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:25,130 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 56 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:19:25,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-20 23:19:25,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-11-20 23:19:25,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 20 states have (on average 2.2) internal successors, (44), 38 states have internal predecessors, (44), 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) [2021-11-20 23:19:25,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2021-11-20 23:19:25,169 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 3 [2021-11-20 23:19:25,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:25,170 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2021-11-20 23:19:25,170 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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) [2021-11-20 23:19:25,170 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2021-11-20 23:19:25,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-20 23:19:25,171 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:25,171 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-20 23:19:25,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:19:25,172 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:25,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:25,177 INFO L85 PathProgramCache]: Analyzing trace with hash 5238508, now seen corresponding path program 1 times [2021-11-20 23:19:25,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:25,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712620504] [2021-11-20 23:19:25,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:25,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:25,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:25,260 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:25,261 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:25,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712620504] [2021-11-20 23:19:25,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1712620504] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:19:25,262 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:19:25,262 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:19:25,262 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052911404] [2021-11-20 23:19:25,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:19:25,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:19:25,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:25,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:19:25,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:19:25,265 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2021-11-20 23:19:25,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:25,321 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2021-11-20 23:19:25,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:19:25,322 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 4 [2021-11-20 23:19:25,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:25,323 INFO L225 Difference]: With dead ends: 37 [2021-11-20 23:19:25,323 INFO L226 Difference]: Without dead ends: 37 [2021-11-20 23:19:25,324 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 [2021-11-20 23:19:25,325 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 37 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:25,326 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 20 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:25,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-20 23:19:25,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-20 23:19:25,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 20 states have (on average 2.1) internal successors, (42), 36 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:25,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2021-11-20 23:19:25,332 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 4 [2021-11-20 23:19:25,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:25,332 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2021-11-20 23:19:25,333 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2021-11-20 23:19:25,333 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2021-11-20 23:19:25,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-20 23:19:25,334 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:25,334 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-20 23:19:25,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 23:19:25,334 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:25,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:25,335 INFO L85 PathProgramCache]: Analyzing trace with hash 5238509, now seen corresponding path program 1 times [2021-11-20 23:19:25,336 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:25,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091677518] [2021-11-20 23:19:25,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:25,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:25,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:25,459 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:25,459 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:25,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091677518] [2021-11-20 23:19:25,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2091677518] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:19:25,460 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:19:25,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:19:25,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661046557] [2021-11-20 23:19:25,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:19:25,461 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:19:25,461 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:25,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:19:25,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:19:25,462 INFO L87 Difference]: Start difference. First operand 37 states and 42 transitions. Second operand has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 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) [2021-11-20 23:19:25,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:25,613 INFO L93 Difference]: Finished difference Result 71 states and 81 transitions. [2021-11-20 23:19:25,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:19:25,614 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 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 4 [2021-11-20 23:19:25,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:25,615 INFO L225 Difference]: With dead ends: 71 [2021-11-20 23:19:25,615 INFO L226 Difference]: Without dead ends: 71 [2021-11-20 23:19:25,616 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:19:25,617 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 117 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:25,618 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 55 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:25,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-20 23:19:25,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 39. [2021-11-20 23:19:25,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 22 states have (on average 2.0454545454545454) internal successors, (45), 38 states have internal predecessors, (45), 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) [2021-11-20 23:19:25,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2021-11-20 23:19:25,625 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 4 [2021-11-20 23:19:25,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:25,626 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2021-11-20 23:19:25,626 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 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) [2021-11-20 23:19:25,626 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2021-11-20 23:19:25,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-20 23:19:25,626 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:25,627 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-20 23:19:25,627 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-20 23:19:25,627 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:25,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:25,628 INFO L85 PathProgramCache]: Analyzing trace with hash 162495202, now seen corresponding path program 1 times [2021-11-20 23:19:25,628 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:25,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461053155] [2021-11-20 23:19:25,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:25,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:25,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:25,672 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:25,672 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:25,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461053155] [2021-11-20 23:19:25,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1461053155] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:19:25,673 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:19:25,673 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:19:25,673 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354034127] [2021-11-20 23:19:25,673 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:19:25,674 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:19:25,674 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:25,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:19:25,675 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:19:25,675 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 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) [2021-11-20 23:19:25,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:25,706 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2021-11-20 23:19:25,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:19:25,706 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 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 5 [2021-11-20 23:19:25,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:25,707 INFO L225 Difference]: With dead ends: 37 [2021-11-20 23:19:25,707 INFO L226 Difference]: Without dead ends: 37 [2021-11-20 23:19:25,708 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 [2021-11-20 23:19:25,709 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 34 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:25,710 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 20 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:19:25,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-20 23:19:25,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-20 23:19:25,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 36 states have internal predecessors, (43), 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) [2021-11-20 23:19:25,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2021-11-20 23:19:25,724 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 5 [2021-11-20 23:19:25,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:25,726 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2021-11-20 23:19:25,726 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 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) [2021-11-20 23:19:25,726 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2021-11-20 23:19:25,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-20 23:19:25,727 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:25,727 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-20 23:19:25,727 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-20 23:19:25,727 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:25,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:25,728 INFO L85 PathProgramCache]: Analyzing trace with hash 162495203, now seen corresponding path program 1 times [2021-11-20 23:19:25,728 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:25,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878864064] [2021-11-20 23:19:25,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:25,729 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:25,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:25,809 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:25,810 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:25,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [878864064] [2021-11-20 23:19:25,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [878864064] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:19:25,811 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:19:25,811 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:19:25,811 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312088873] [2021-11-20 23:19:25,811 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:19:25,812 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:19:25,812 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:25,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:19:25,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:19:25,813 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 4 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 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) [2021-11-20 23:19:25,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:25,879 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2021-11-20 23:19:25,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:19:25,879 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 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 5 [2021-11-20 23:19:25,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:25,881 INFO L225 Difference]: With dead ends: 65 [2021-11-20 23:19:25,881 INFO L226 Difference]: Without dead ends: 65 [2021-11-20 23:19:25,881 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:19:25,886 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 64 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:25,887 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 80 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:19:25,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-20 23:19:25,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 38. [2021-11-20 23:19:25,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 37 states have internal predecessors, (44), 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) [2021-11-20 23:19:25,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2021-11-20 23:19:25,900 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 5 [2021-11-20 23:19:25,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:25,901 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2021-11-20 23:19:25,901 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 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) [2021-11-20 23:19:25,901 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2021-11-20 23:19:25,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-20 23:19:25,902 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:25,902 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-20 23:19:25,903 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-20 23:19:25,904 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:25,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:25,904 INFO L85 PathProgramCache]: Analyzing trace with hash 162498002, now seen corresponding path program 1 times [2021-11-20 23:19:25,905 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:25,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [499148353] [2021-11-20 23:19:25,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:25,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:25,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:26,031 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:26,031 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:26,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [499148353] [2021-11-20 23:19:26,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [499148353] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:19:26,050 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:19:26,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:19:26,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135676213] [2021-11-20 23:19:26,050 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:19:26,051 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:19:26,051 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:26,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:19:26,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:19:26,052 INFO L87 Difference]: Start difference. First operand 38 states and 44 transitions. Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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) [2021-11-20 23:19:26,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:26,109 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2021-11-20 23:19:26,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:19:26,109 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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 5 [2021-11-20 23:19:26,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:26,111 INFO L225 Difference]: With dead ends: 37 [2021-11-20 23:19:26,111 INFO L226 Difference]: Without dead ends: 37 [2021-11-20 23:19:26,111 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:19:26,121 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 73 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:26,124 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 15 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:19:26,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-20 23:19:26,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-20 23:19:26,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 36 states have internal predecessors, (43), 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) [2021-11-20 23:19:26,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2021-11-20 23:19:26,129 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 5 [2021-11-20 23:19:26,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:26,129 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2021-11-20 23:19:26,129 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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) [2021-11-20 23:19:26,129 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2021-11-20 23:19:26,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-20 23:19:26,130 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:26,130 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2021-11-20 23:19:26,130 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-20 23:19:26,130 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:26,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:26,131 INFO L85 PathProgramCache]: Analyzing trace with hash 739335090, now seen corresponding path program 1 times [2021-11-20 23:19:26,131 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:26,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741557228] [2021-11-20 23:19:26,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:26,132 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:26,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:26,304 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:26,305 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:26,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741557228] [2021-11-20 23:19:26,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1741557228] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:26,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1234512239] [2021-11-20 23:19:26,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:26,306 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:26,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:26,307 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:26,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:19:26,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:26,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-20 23:19:26,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:26,458 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:19:26,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-20 23:19:26,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:19:26,611 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:26,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:26,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 28 [2021-11-20 23:19:26,810 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:26,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1234512239] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:26,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [132984323] [2021-11-20 23:19:26,831 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-20 23:19:26,831 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:26,836 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:26,841 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:26,842 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:27,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:27,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:27,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:19:27,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:19:27,723 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:19:27,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:19:28,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:19:29,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:19:29,111 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:29,668 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:29,669 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:29,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2021-11-20 23:19:29,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1501710440] [2021-11-20 23:19:29,669 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:29,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-20 23:19:29,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:29,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-20 23:19:29,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2021-11-20 23:19:29,671 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second 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) [2021-11-20 23:19:30,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:30,134 INFO L93 Difference]: Finished difference Result 127 states and 147 transitions. [2021-11-20 23:19:30,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-20 23:19:30,134 INFO L78 Accepts]: Start accepts. Automaton has 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) Word has length 6 [2021-11-20 23:19:30,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:30,135 INFO L225 Difference]: With dead ends: 127 [2021-11-20 23:19:30,136 INFO L226 Difference]: Without dead ends: 127 [2021-11-20 23:19:30,136 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=154, Invalid=446, Unknown=0, NotChecked=0, Total=600 [2021-11-20 23:19:30,137 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 619 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 270 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 619 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 270 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:30,137 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [619 Valid, 191 Invalid, 292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 270 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:19:30,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-20 23:19:30,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 43. [2021-11-20 23:19:30,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 29 states have (on average 1.793103448275862) internal successors, (52), 42 states have internal predecessors, (52), 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) [2021-11-20 23:19:30,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 52 transitions. [2021-11-20 23:19:30,144 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 52 transitions. Word has length 6 [2021-11-20 23:19:30,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:30,144 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 52 transitions. [2021-11-20 23:19:30,145 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has 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) [2021-11-20 23:19:30,145 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 52 transitions. [2021-11-20 23:19:30,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-20 23:19:30,145 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:30,145 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-20 23:19:30,190 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:30,361 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-20 23:19:30,362 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:30,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:30,362 INFO L85 PathProgramCache]: Analyzing trace with hash 742470770, now seen corresponding path program 1 times [2021-11-20 23:19:30,362 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:30,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518011920] [2021-11-20 23:19:30,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:30,363 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:30,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:30,413 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:30,414 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:30,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518011920] [2021-11-20 23:19:30,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1518011920] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:19:30,414 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:19:30,414 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:19:30,414 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411034261] [2021-11-20 23:19:30,414 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:19:30,415 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:19:30,415 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:30,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:19:30,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:19:30,416 INFO L87 Difference]: Start difference. First operand 43 states and 52 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:30,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:30,442 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2021-11-20 23:19:30,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:19:30,443 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-20 23:19:30,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:30,444 INFO L225 Difference]: With dead ends: 42 [2021-11-20 23:19:30,444 INFO L226 Difference]: Without dead ends: 42 [2021-11-20 23:19:30,445 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:19:30,446 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 70 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:30,446 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 16 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:19:30,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-20 23:19:30,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-11-20 23:19:30,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 29 states have (on average 1.7586206896551724) internal successors, (51), 41 states have internal predecessors, (51), 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) [2021-11-20 23:19:30,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 51 transitions. [2021-11-20 23:19:30,455 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 51 transitions. Word has length 6 [2021-11-20 23:19:30,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:30,456 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 51 transitions. [2021-11-20 23:19:30,456 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:30,456 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 51 transitions. [2021-11-20 23:19:30,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-20 23:19:30,457 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:30,457 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:30,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-20 23:19:30,457 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:30,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:30,461 INFO L85 PathProgramCache]: Analyzing trace with hash 1444652734, now seen corresponding path program 1 times [2021-11-20 23:19:30,463 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:30,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068571106] [2021-11-20 23:19:30,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:30,463 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:30,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:30,533 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:19:30,534 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:30,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1068571106] [2021-11-20 23:19:30,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1068571106] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:19:30,534 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:19:30,534 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:19:30,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121401376] [2021-11-20 23:19:30,535 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:19:30,535 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:19:30,535 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:30,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:19:30,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:19:30,536 INFO L87 Difference]: Start difference. First operand 42 states and 51 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 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) [2021-11-20 23:19:30,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:30,599 INFO L93 Difference]: Finished difference Result 69 states and 82 transitions. [2021-11-20 23:19:30,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:19:30,600 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 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 [2021-11-20 23:19:30,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:30,601 INFO L225 Difference]: With dead ends: 69 [2021-11-20 23:19:30,601 INFO L226 Difference]: Without dead ends: 69 [2021-11-20 23:19:30,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:19:30,602 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 64 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:30,603 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 49 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:30,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-11-20 23:19:30,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 44. [2021-11-20 23:19:30,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 31 states have (on average 1.7419354838709677) internal successors, (54), 43 states have internal predecessors, (54), 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) [2021-11-20 23:19:30,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 54 transitions. [2021-11-20 23:19:30,608 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 54 transitions. Word has length 7 [2021-11-20 23:19:30,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:30,608 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 54 transitions. [2021-11-20 23:19:30,608 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 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) [2021-11-20 23:19:30,608 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 54 transitions. [2021-11-20 23:19:30,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-20 23:19:30,609 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:30,609 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:30,609 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-20 23:19:30,609 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:30,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:30,610 INFO L85 PathProgramCache]: Analyzing trace with hash 1541759385, now seen corresponding path program 1 times [2021-11-20 23:19:30,610 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:30,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913690466] [2021-11-20 23:19:30,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:30,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:30,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:30,634 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:30,634 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:30,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913690466] [2021-11-20 23:19:30,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1913690466] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:19:30,635 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:19:30,635 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:19:30,635 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [264967134] [2021-11-20 23:19:30,635 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:19:30,636 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:19:30,636 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:30,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:19:30,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:19:30,637 INFO L87 Difference]: Start difference. First operand 44 states and 54 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 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) [2021-11-20 23:19:30,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:30,676 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2021-11-20 23:19:30,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:19:30,677 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 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 [2021-11-20 23:19:30,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:30,677 INFO L225 Difference]: With dead ends: 40 [2021-11-20 23:19:30,678 INFO L226 Difference]: Without dead ends: 40 [2021-11-20 23:19:30,678 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:19:30,679 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 45 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:30,679 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 16 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:19:30,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-20 23:19:30,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-11-20 23:19:30,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 31 states have (on average 1.6129032258064515) internal successors, (50), 39 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) [2021-11-20 23:19:30,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2021-11-20 23:19:30,683 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 7 [2021-11-20 23:19:30,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:30,684 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2021-11-20 23:19:30,684 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 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) [2021-11-20 23:19:30,684 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2021-11-20 23:19:30,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-20 23:19:30,685 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:30,685 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:30,685 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-20 23:19:30,685 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:30,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:30,686 INFO L85 PathProgramCache]: Analyzing trace with hash 1541759386, now seen corresponding path program 1 times [2021-11-20 23:19:30,686 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:30,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2015293540] [2021-11-20 23:19:30,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:30,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:30,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:30,726 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:30,726 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:30,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2015293540] [2021-11-20 23:19:30,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2015293540] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:19:30,727 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:19:30,727 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:19:30,727 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601835807] [2021-11-20 23:19:30,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:19:30,727 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:19:30,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:30,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:19:30,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:19:30,728 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 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) [2021-11-20 23:19:30,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:30,793 INFO L93 Difference]: Finished difference Result 56 states and 69 transitions. [2021-11-20 23:19:30,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:19:30,794 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 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 [2021-11-20 23:19:30,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:30,794 INFO L225 Difference]: With dead ends: 56 [2021-11-20 23:19:30,794 INFO L226 Difference]: Without dead ends: 56 [2021-11-20 23:19:30,795 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:19:30,796 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 108 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:30,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 26 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:30,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-20 23:19:30,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 50. [2021-11-20 23:19:30,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 41 states have (on average 1.6097560975609757) internal successors, (66), 49 states have internal predecessors, (66), 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) [2021-11-20 23:19:30,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 66 transitions. [2021-11-20 23:19:30,800 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 66 transitions. Word has length 7 [2021-11-20 23:19:30,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:30,801 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 66 transitions. [2021-11-20 23:19:30,801 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 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) [2021-11-20 23:19:30,801 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 66 transitions. [2021-11-20 23:19:30,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-20 23:19:30,802 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:30,802 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:30,802 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-20 23:19:30,802 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:30,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:30,803 INFO L85 PathProgramCache]: Analyzing trace with hash 1036916398, now seen corresponding path program 1 times [2021-11-20 23:19:30,803 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:30,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [736415422] [2021-11-20 23:19:30,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:30,804 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:30,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:30,855 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:30,856 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:30,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [736415422] [2021-11-20 23:19:30,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [736415422] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:30,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345581656] [2021-11-20 23:19:30,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:30,856 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:30,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:30,858 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:30,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:19:30,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:30,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-20 23:19:30,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:30,994 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:30,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:31,069 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:31,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345581656] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:31,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [318244420] [2021-11-20 23:19:31,080 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:19:31,081 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:31,081 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:31,081 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:31,081 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:31,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:31,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:31,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:19:31,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:19:31,736 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:19:31,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:19:32,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:19:32,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:19:33,642 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:19:33,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 46 [2021-11-20 23:19:34,021 INFO L354 Elim1Store]: treesize reduction 44, result has 53.2 percent of original size [2021-11-20 23:19:34,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 151 treesize of output 160 [2021-11-20 23:19:34,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:19:35,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:19:35,291 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:35,814 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:35,815 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:35,815 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2021-11-20 23:19:35,815 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102694706] [2021-11-20 23:19:35,815 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:35,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-20 23:19:35,816 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:35,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-20 23:19:35,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2021-11-20 23:19:35,817 INFO L87 Difference]: Start difference. First operand 50 states and 66 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 13 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) [2021-11-20 23:19:35,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:35,969 INFO L93 Difference]: Finished difference Result 146 states and 190 transitions. [2021-11-20 23:19:35,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-20 23:19:35,970 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 13 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 9 [2021-11-20 23:19:35,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:35,971 INFO L225 Difference]: With dead ends: 146 [2021-11-20 23:19:35,971 INFO L226 Difference]: Without dead ends: 146 [2021-11-20 23:19:35,971 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=108, Invalid=398, Unknown=0, NotChecked=0, Total=506 [2021-11-20 23:19:35,972 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 362 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 362 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:35,972 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [362 Valid, 246 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:35,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-11-20 23:19:35,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 52. [2021-11-20 23:19:35,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 43 states have (on average 1.6046511627906976) internal successors, (69), 51 states have internal predecessors, (69), 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) [2021-11-20 23:19:35,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 69 transitions. [2021-11-20 23:19:35,977 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 69 transitions. Word has length 9 [2021-11-20 23:19:35,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:35,978 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 69 transitions. [2021-11-20 23:19:35,978 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 13 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) [2021-11-20 23:19:35,978 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 69 transitions. [2021-11-20 23:19:35,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-20 23:19:35,978 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:35,979 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:36,005 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:36,179 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-20 23:19:36,179 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:36,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:36,181 INFO L85 PathProgramCache]: Analyzing trace with hash -132946573, now seen corresponding path program 1 times [2021-11-20 23:19:36,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:36,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626818511] [2021-11-20 23:19:36,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:36,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:36,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:36,257 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:36,257 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:36,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1626818511] [2021-11-20 23:19:36,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1626818511] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:36,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112286203] [2021-11-20 23:19:36,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:36,258 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:36,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:36,259 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:36,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:19:36,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:36,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:19:36,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:36,342 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:19:36,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-20 23:19:36,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:19:36,436 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:36,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:36,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 28 [2021-11-20 23:19:36,570 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:36,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1112286203] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:36,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [371383737] [2021-11-20 23:19:36,573 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-20 23:19:36,573 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:36,574 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:36,574 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:36,574 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:36,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:36,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:36,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:19:37,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:19:37,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:37,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:19:37,630 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:38,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [371383737] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:19:38,107 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:38,107 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 6, 6] total 20 [2021-11-20 23:19:38,108 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452355101] [2021-11-20 23:19:38,108 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:19:38,108 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 23:19:38,108 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:38,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 23:19:38,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=345, Unknown=0, NotChecked=0, Total=462 [2021-11-20 23:19:38,109 INFO L87 Difference]: Start difference. First operand 52 states and 69 transitions. Second operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:38,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:38,383 INFO L93 Difference]: Finished difference Result 99 states and 128 transitions. [2021-11-20 23:19:38,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-20 23:19:38,384 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-20 23:19:38,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:38,385 INFO L225 Difference]: With dead ends: 99 [2021-11-20 23:19:38,385 INFO L226 Difference]: Without dead ends: 89 [2021-11-20 23:19:38,386 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=117, Invalid=345, Unknown=0, NotChecked=0, Total=462 [2021-11-20 23:19:38,386 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 64 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:38,387 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 51 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:19:38,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-20 23:19:38,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 70. [2021-11-20 23:19:38,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 61 states have (on average 1.5737704918032787) internal successors, (96), 69 states have internal predecessors, (96), 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) [2021-11-20 23:19:38,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 96 transitions. [2021-11-20 23:19:38,392 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 96 transitions. Word has length 9 [2021-11-20 23:19:38,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:38,392 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 96 transitions. [2021-11-20 23:19:38,392 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:38,393 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 96 transitions. [2021-11-20 23:19:38,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-20 23:19:38,393 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:38,393 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1] [2021-11-20 23:19:38,428 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:38,594 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-20 23:19:38,594 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:38,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:38,595 INFO L85 PathProgramCache]: Analyzing trace with hash -566567671, now seen corresponding path program 2 times [2021-11-20 23:19:38,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:38,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511908012] [2021-11-20 23:19:38,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:38,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:38,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:38,665 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:19:38,665 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:38,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511908012] [2021-11-20 23:19:38,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [511908012] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:38,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [528367614] [2021-11-20 23:19:38,666 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:19:38,666 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:38,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:38,682 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:38,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:19:38,736 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 23:19:38,736 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:19:38,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-20 23:19:38,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:38,759 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:19:38,759 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-20 23:19:38,826 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:19:38,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:39,008 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:19:39,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [528367614] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:39,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1488295745] [2021-11-20 23:19:39,012 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:19:39,012 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:39,012 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:39,012 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:39,013 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:39,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:39,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:39,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:19:39,322 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:19:39,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:39,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 214 treesize of output 206 [2021-11-20 23:19:40,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:19:40,322 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:19:41,136 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:19:41,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 46 [2021-11-20 23:19:41,518 INFO L354 Elim1Store]: treesize reduction 44, result has 53.2 percent of original size [2021-11-20 23:19:41,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 151 treesize of output 160 [2021-11-20 23:19:42,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:19:42,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:19:42,840 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:43,368 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:43,369 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:43,369 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2021-11-20 23:19:43,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481370571] [2021-11-20 23:19:43,369 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:43,369 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-20 23:19:43,369 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:43,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-20 23:19:43,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-11-20 23:19:43,370 INFO L87 Difference]: Start difference. First operand 70 states and 96 transitions. Second operand has 11 states, 10 states have (on average 2.0) internal successors, (20), 11 states have internal predecessors, (20), 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) [2021-11-20 23:19:43,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:43,543 INFO L93 Difference]: Finished difference Result 132 states and 177 transitions. [2021-11-20 23:19:43,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-20 23:19:43,543 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.0) internal successors, (20), 11 states have internal predecessors, (20), 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 [2021-11-20 23:19:43,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:43,545 INFO L225 Difference]: With dead ends: 132 [2021-11-20 23:19:43,545 INFO L226 Difference]: Without dead ends: 132 [2021-11-20 23:19:43,546 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-20 23:19:43,546 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 308 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 308 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:43,546 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [308 Valid, 104 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 158 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:43,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-20 23:19:43,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 67. [2021-11-20 23:19:43,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 59 states have (on average 1.5593220338983051) internal successors, (92), 66 states have internal predecessors, (92), 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) [2021-11-20 23:19:43,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 92 transitions. [2021-11-20 23:19:43,551 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 92 transitions. Word has length 11 [2021-11-20 23:19:43,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:43,551 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 92 transitions. [2021-11-20 23:19:43,551 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.0) internal successors, (20), 11 states have internal predecessors, (20), 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) [2021-11-20 23:19:43,552 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 92 transitions. [2021-11-20 23:19:43,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-20 23:19:43,552 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:43,552 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:43,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:43,774 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-20 23:19:43,774 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:43,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:43,774 INFO L85 PathProgramCache]: Analyzing trace with hash -1736430642, now seen corresponding path program 1 times [2021-11-20 23:19:43,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:43,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [104669] [2021-11-20 23:19:43,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:43,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:43,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:43,854 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:43,854 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:43,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [104669] [2021-11-20 23:19:43,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [104669] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:43,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1729485024] [2021-11-20 23:19:43,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:43,855 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:43,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:43,873 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:43,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:19:43,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:43,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-20 23:19:43,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:43,958 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:19:43,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-20 23:19:43,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:19:44,105 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:44,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:44,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 28 [2021-11-20 23:19:44,281 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:44,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1729485024] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:44,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1479497555] [2021-11-20 23:19:44,286 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:19:44,286 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:44,286 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:44,286 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:44,286 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:44,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:44,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:44,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:19:44,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:19:44,919 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:19:44,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:19:45,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:19:45,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:19:46,491 INFO L354 Elim1Store]: treesize reduction 32, result has 33.3 percent of original size [2021-11-20 23:19:46,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 206 [2021-11-20 23:19:47,096 INFO L354 Elim1Store]: treesize reduction 82, result has 35.9 percent of original size [2021-11-20 23:19:47,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 207 treesize of output 224 [2021-11-20 23:19:49,230 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:50,646 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:50,646 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:50,646 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 19 [2021-11-20 23:19:50,647 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241366093] [2021-11-20 23:19:50,647 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:50,647 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-20 23:19:50,647 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:50,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-20 23:19:50,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=701, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:19:50,648 INFO L87 Difference]: Start difference. First operand 67 states and 92 transitions. Second operand has 20 states, 19 states have (on average 1.736842105263158) internal successors, (33), 20 states have internal predecessors, (33), 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) [2021-11-20 23:19:51,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:51,297 INFO L93 Difference]: Finished difference Result 127 states and 152 transitions. [2021-11-20 23:19:51,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-20 23:19:51,298 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.736842105263158) internal successors, (33), 20 states have internal predecessors, (33), 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 [2021-11-20 23:19:51,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:51,299 INFO L225 Difference]: With dead ends: 127 [2021-11-20 23:19:51,299 INFO L226 Difference]: Without dead ends: 121 [2021-11-20 23:19:51,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=257, Invalid=1303, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 23:19:51,300 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 802 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 350 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 802 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 449 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 350 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:51,301 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [802 Valid, 198 Invalid, 449 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 350 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:19:51,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-11-20 23:19:51,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 80. [2021-11-20 23:19:51,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 73 states have (on average 1.5753424657534247) internal successors, (115), 79 states have internal predecessors, (115), 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) [2021-11-20 23:19:51,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 115 transitions. [2021-11-20 23:19:51,305 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 115 transitions. Word has length 11 [2021-11-20 23:19:51,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:51,305 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 115 transitions. [2021-11-20 23:19:51,306 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.736842105263158) internal successors, (33), 20 states have internal predecessors, (33), 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) [2021-11-20 23:19:51,306 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 115 transitions. [2021-11-20 23:19:51,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-20 23:19:51,306 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:51,306 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:51,340 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:51,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:51,519 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:51,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:51,520 INFO L85 PathProgramCache]: Analyzing trace with hash 1087317027, now seen corresponding path program 1 times [2021-11-20 23:19:51,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:51,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684653998] [2021-11-20 23:19:51,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:51,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:51,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:51,541 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:51,541 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:51,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684653998] [2021-11-20 23:19:51,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1684653998] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:19:51,542 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:19:51,542 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:19:51,542 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488226073] [2021-11-20 23:19:51,542 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:19:51,542 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:19:51,543 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:51,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:19:51,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:19:51,543 INFO L87 Difference]: Start difference. First operand 80 states and 115 transitions. Second operand has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 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) [2021-11-20 23:19:51,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:51,581 INFO L93 Difference]: Finished difference Result 84 states and 116 transitions. [2021-11-20 23:19:51,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:19:51,581 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 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 [2021-11-20 23:19:51,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:51,582 INFO L225 Difference]: With dead ends: 84 [2021-11-20 23:19:51,582 INFO L226 Difference]: Without dead ends: 84 [2021-11-20 23:19:51,583 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:19:51,583 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 18 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:51,584 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 33 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:19:51,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-20 23:19:51,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 79. [2021-11-20 23:19:51,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 73 states have (on average 1.4794520547945205) internal successors, (108), 78 states have internal predecessors, (108), 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) [2021-11-20 23:19:51,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 108 transitions. [2021-11-20 23:19:51,588 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 108 transitions. Word has length 11 [2021-11-20 23:19:51,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:51,588 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 108 transitions. [2021-11-20 23:19:51,588 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 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) [2021-11-20 23:19:51,588 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 108 transitions. [2021-11-20 23:19:51,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-20 23:19:51,589 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:51,589 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:51,589 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-20 23:19:51,590 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:51,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:51,590 INFO L85 PathProgramCache]: Analyzing trace with hash 1087317028, now seen corresponding path program 1 times [2021-11-20 23:19:51,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:51,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [130753763] [2021-11-20 23:19:51,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:51,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:51,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:51,635 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:51,635 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:51,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [130753763] [2021-11-20 23:19:51,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [130753763] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:19:51,635 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:19:51,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:19:51,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299243866] [2021-11-20 23:19:51,636 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:19:51,636 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:19:51,636 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:51,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:19:51,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:19:51,637 INFO L87 Difference]: Start difference. First operand 79 states and 108 transitions. Second operand has 5 states, 4 states have (on average 2.75) internal successors, (11), 5 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) [2021-11-20 23:19:51,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:51,708 INFO L93 Difference]: Finished difference Result 119 states and 159 transitions. [2021-11-20 23:19:51,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:19:51,709 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 5 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 [2021-11-20 23:19:51,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:51,710 INFO L225 Difference]: With dead ends: 119 [2021-11-20 23:19:51,710 INFO L226 Difference]: Without dead ends: 119 [2021-11-20 23:19:51,710 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:19:51,711 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 57 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:51,711 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 29 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:51,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-20 23:19:51,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 101. [2021-11-20 23:19:51,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 95 states have (on average 1.4526315789473685) internal successors, (138), 100 states have internal predecessors, (138), 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) [2021-11-20 23:19:51,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 138 transitions. [2021-11-20 23:19:51,715 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 138 transitions. Word has length 11 [2021-11-20 23:19:51,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:51,716 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 138 transitions. [2021-11-20 23:19:51,716 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 5 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) [2021-11-20 23:19:51,716 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 138 transitions. [2021-11-20 23:19:51,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-20 23:19:51,717 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:51,717 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2021-11-20 23:19:51,717 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-20 23:19:51,717 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:51,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:51,718 INFO L85 PathProgramCache]: Analyzing trace with hash 978989697, now seen corresponding path program 2 times [2021-11-20 23:19:51,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:51,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837829682] [2021-11-20 23:19:51,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:51,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:51,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:51,857 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 9 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:51,857 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:51,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837829682] [2021-11-20 23:19:51,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [837829682] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:51,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [98338020] [2021-11-20 23:19:51,858 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:19:51,858 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:51,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:51,861 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:51,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:19:51,908 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 23:19:51,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:19:51,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-20 23:19:51,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:51,931 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:19:51,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-20 23:19:51,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:19:52,061 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 23:19:52,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:52,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 33 [2021-11-20 23:19:52,193 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 23:19:52,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [98338020] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:52,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2017773132] [2021-11-20 23:19:52,195 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-20 23:19:52,195 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:52,195 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:52,196 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:52,196 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:52,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:52,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:52,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:19:52,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:19:52,751 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:19:52,752 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:19:53,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:19:53,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:19:53,792 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:54,193 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:54,193 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:54,194 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4] total 14 [2021-11-20 23:19:54,194 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416850483] [2021-11-20 23:19:54,194 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:54,194 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-20 23:19:54,194 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:54,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-20 23:19:54,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=284, Unknown=0, NotChecked=0, Total=380 [2021-11-20 23:19:54,195 INFO L87 Difference]: Start difference. First operand 101 states and 138 transitions. Second operand has 16 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 15 states have internal predecessors, (25), 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) [2021-11-20 23:19:54,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:54,566 INFO L93 Difference]: Finished difference Result 266 states and 362 transitions. [2021-11-20 23:19:54,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 23:19:54,567 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 15 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-20 23:19:54,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:54,569 INFO L225 Difference]: With dead ends: 266 [2021-11-20 23:19:54,569 INFO L226 Difference]: Without dead ends: 266 [2021-11-20 23:19:54,570 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=207, Invalid=549, Unknown=0, NotChecked=0, Total=756 [2021-11-20 23:19:54,570 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 360 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 311 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 360 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:54,571 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [360 Valid, 189 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 311 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:19:54,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-11-20 23:19:54,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 95. [2021-11-20 23:19:54,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.4444444444444444) internal successors, (130), 94 states have internal predecessors, (130), 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) [2021-11-20 23:19:54,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 130 transitions. [2021-11-20 23:19:54,576 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 130 transitions. Word has length 12 [2021-11-20 23:19:54,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:54,576 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 130 transitions. [2021-11-20 23:19:54,576 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 15 states have internal predecessors, (25), 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) [2021-11-20 23:19:54,576 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 130 transitions. [2021-11-20 23:19:54,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-20 23:19:54,577 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:54,577 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:54,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:54,793 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-20 23:19:54,794 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:19:54,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:54,795 INFO L85 PathProgramCache]: Analyzing trace with hash -1043175616, now seen corresponding path program 2 times [2021-11-20 23:19:54,795 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:54,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1336382426] [2021-11-20 23:19:54,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:54,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:54,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:55,121 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:55,121 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:55,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1336382426] [2021-11-20 23:19:55,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1336382426] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:55,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [596540236] [2021-11-20 23:19:55,122 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:19:55,122 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:55,122 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:55,123 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:55,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:19:55,194 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-20 23:19:55,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:19:55,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-20 23:19:55,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:55,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-11-20 23:19:55,434 INFO L354 Elim1Store]: treesize reduction 44, result has 21.4 percent of original size [2021-11-20 23:19:55,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 41 [2021-11-20 23:19:55,716 INFO L354 Elim1Store]: treesize reduction 66, result has 10.8 percent of original size [2021-11-20 23:19:55,716 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 53 treesize of output 37 [2021-11-20 23:19:55,746 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:19:55,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:57,938 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-11-20 23:19:57,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 113 treesize of output 103 [2021-11-20 23:19:58,193 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:19:58,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [596540236] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:58,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2055890238] [2021-11-20 23:19:58,195 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:19:58,195 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:58,195 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:58,195 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:58,195 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:58,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:58,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:58,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:19:58,540 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:19:58,785 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:19:58,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:19:59,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:19:59,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:20:00,485 INFO L354 Elim1Store]: treesize reduction 32, result has 33.3 percent of original size [2021-11-20 23:20:00,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 206 [2021-11-20 23:20:01,078 INFO L354 Elim1Store]: treesize reduction 82, result has 35.9 percent of original size [2021-11-20 23:20:01,078 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 207 treesize of output 224 [2021-11-20 23:20:03,308 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:04,851 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:04,851 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:04,851 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12, 12] total 31 [2021-11-20 23:20:04,851 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418669207] [2021-11-20 23:20:04,851 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:04,852 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-20 23:20:04,852 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:04,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-20 23:20:04,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1431, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 23:20:04,854 INFO L87 Difference]: Start difference. First operand 95 states and 130 transitions. Second operand has 31 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 31 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:26,668 WARN L227 SmtUtils]: Spent 21.01s on a formula simplification. DAG size of input: 66 DAG size of output: 59 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-20 23:20:27,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:27,187 INFO L93 Difference]: Finished difference Result 157 states and 200 transitions. [2021-11-20 23:20:27,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-20 23:20:27,187 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 31 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-20 23:20:27,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:27,188 INFO L225 Difference]: With dead ends: 157 [2021-11-20 23:20:27,188 INFO L226 Difference]: Without dead ends: 157 [2021-11-20 23:20:27,190 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 642 ImplicationChecksByTransitivity, 26.1s TimeCoverageRelationStatistics Valid=298, Invalid=3008, Unknown=0, NotChecked=0, Total=3306 [2021-11-20 23:20:27,190 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 129 mSDsluCounter, 713 mSDsCounter, 0 mSdLazyCounter, 817 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 612 SdHoareTripleChecker+Invalid, 881 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 817 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:27,191 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 612 Invalid, 881 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 817 Invalid, 0 Unknown, 43 Unchecked, 0.5s Time] [2021-11-20 23:20:27,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-11-20 23:20:27,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 103. [2021-11-20 23:20:27,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.4285714285714286) internal successors, (140), 102 states have internal predecessors, (140), 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) [2021-11-20 23:20:27,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 140 transitions. [2021-11-20 23:20:27,194 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 140 transitions. Word has length 15 [2021-11-20 23:20:27,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:27,194 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 140 transitions. [2021-11-20 23:20:27,195 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 31 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:27,195 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 140 transitions. [2021-11-20 23:20:27,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-20 23:20:27,195 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:27,196 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:27,233 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:27,413 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:27,413 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:20:27,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:27,414 INFO L85 PathProgramCache]: Analyzing trace with hash -1735464012, now seen corresponding path program 1 times [2021-11-20 23:20:27,414 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:27,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2059051882] [2021-11-20 23:20:27,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:27,414 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:27,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:27,533 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:27,534 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:27,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2059051882] [2021-11-20 23:20:27,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2059051882] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:20:27,534 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:20:27,534 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-20 23:20:27,534 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269049949] [2021-11-20 23:20:27,534 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:20:27,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 23:20:27,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:27,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 23:20:27,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-20 23:20:27,535 INFO L87 Difference]: Start difference. First operand 103 states and 140 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 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) [2021-11-20 23:20:27,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:27,764 INFO L93 Difference]: Finished difference Result 82 states and 102 transitions. [2021-11-20 23:20:27,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-20 23:20:27,765 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 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 16 [2021-11-20 23:20:27,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:27,765 INFO L225 Difference]: With dead ends: 82 [2021-11-20 23:20:27,765 INFO L226 Difference]: Without dead ends: 71 [2021-11-20 23:20:27,766 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2021-11-20 23:20:27,766 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 18 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:27,767 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 108 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:20:27,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-20 23:20:27,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 67. [2021-11-20 23:20:27,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.403225806451613) internal successors, (87), 66 states have internal predecessors, (87), 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) [2021-11-20 23:20:27,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 87 transitions. [2021-11-20 23:20:27,770 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 87 transitions. Word has length 16 [2021-11-20 23:20:27,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:27,770 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 87 transitions. [2021-11-20 23:20:27,770 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 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) [2021-11-20 23:20:27,770 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 87 transitions. [2021-11-20 23:20:27,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-20 23:20:27,771 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:27,771 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:27,771 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-20 23:20:27,771 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:20:27,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:27,772 INFO L85 PathProgramCache]: Analyzing trace with hash -842320953, now seen corresponding path program 1 times [2021-11-20 23:20:27,772 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:27,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266948047] [2021-11-20 23:20:27,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:27,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:27,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:27,802 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:20:27,803 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:27,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266948047] [2021-11-20 23:20:27,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [266948047] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:20:27,803 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:20:27,803 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:20:27,803 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383803218] [2021-11-20 23:20:27,804 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:20:27,804 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:20:27,804 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:27,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:20:27,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:20:27,805 INFO L87 Difference]: Start difference. First operand 67 states and 87 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 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) [2021-11-20 23:20:27,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:27,851 INFO L93 Difference]: Finished difference Result 77 states and 96 transitions. [2021-11-20 23:20:27,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:20:27,851 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 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 17 [2021-11-20 23:20:27,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:27,852 INFO L225 Difference]: With dead ends: 77 [2021-11-20 23:20:27,852 INFO L226 Difference]: Without dead ends: 77 [2021-11-20 23:20:27,852 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-20 23:20:27,853 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 52 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:27,853 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 40 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:20:27,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-20 23:20:27,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 67. [2021-11-20 23:20:27,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.3548387096774193) internal successors, (84), 66 states have internal predecessors, (84), 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) [2021-11-20 23:20:27,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 84 transitions. [2021-11-20 23:20:27,856 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 84 transitions. Word has length 17 [2021-11-20 23:20:27,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:27,857 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 84 transitions. [2021-11-20 23:20:27,857 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 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) [2021-11-20 23:20:27,857 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 84 transitions. [2021-11-20 23:20:27,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-20 23:20:27,858 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:27,858 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:27,858 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-20 23:20:27,858 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:20:27,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:27,859 INFO L85 PathProgramCache]: Analyzing trace with hash -60663559, now seen corresponding path program 1 times [2021-11-20 23:20:27,859 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:27,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572304985] [2021-11-20 23:20:27,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:27,859 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:27,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:27,958 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:20:27,959 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:27,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1572304985] [2021-11-20 23:20:27,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1572304985] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:20:27,959 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:20:27,959 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-20 23:20:27,960 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353679117] [2021-11-20 23:20:27,960 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:20:27,960 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-20 23:20:27,960 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:27,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-20 23:20:27,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-20 23:20:27,961 INFO L87 Difference]: Start difference. First operand 67 states and 84 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 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) [2021-11-20 23:20:28,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:28,207 INFO L93 Difference]: Finished difference Result 108 states and 131 transitions. [2021-11-20 23:20:28,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-20 23:20:28,209 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 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) Word has length 18 [2021-11-20 23:20:28,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:28,210 INFO L225 Difference]: With dead ends: 108 [2021-11-20 23:20:28,210 INFO L226 Difference]: Without dead ends: 108 [2021-11-20 23:20:28,210 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=149, Unknown=0, NotChecked=0, Total=210 [2021-11-20 23:20:28,211 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 74 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:28,211 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 113 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:20:28,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-11-20 23:20:28,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 89. [2021-11-20 23:20:28,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 84 states have (on average 1.3452380952380953) internal successors, (113), 88 states have internal predecessors, (113), 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) [2021-11-20 23:20:28,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 113 transitions. [2021-11-20 23:20:28,214 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 113 transitions. Word has length 18 [2021-11-20 23:20:28,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:28,214 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 113 transitions. [2021-11-20 23:20:28,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 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) [2021-11-20 23:20:28,215 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 113 transitions. [2021-11-20 23:20:28,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-20 23:20:28,215 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:28,215 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:28,215 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-20 23:20:28,216 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:20:28,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:28,216 INFO L85 PathProgramCache]: Analyzing trace with hash -1385179916, now seen corresponding path program 3 times [2021-11-20 23:20:28,216 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:28,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [121581453] [2021-11-20 23:20:28,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:28,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:28,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:28,392 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 9 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:20:28,392 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:28,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [121581453] [2021-11-20 23:20:28,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [121581453] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:28,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1728338774] [2021-11-20 23:20:28,393 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:20:28,393 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:28,393 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:28,393 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:28,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:20:28,437 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:20:28,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:20:28,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-20 23:20:28,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:28,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:20:28,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-11-20 23:20:28,731 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:20:28,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 56 treesize of output 55 [2021-11-20 23:20:29,553 INFO L354 Elim1Store]: treesize reduction 128, result has 14.1 percent of original size [2021-11-20 23:20:29,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 84 treesize of output 71 [2021-11-20 23:20:29,573 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 9 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:20:29,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:29,844 INFO L354 Elim1Store]: treesize reduction 32, result has 3.0 percent of original size [2021-11-20 23:20:29,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 180 treesize of output 164 [2021-11-20 23:20:30,938 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:20:30,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1728338774] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:30,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [133330273] [2021-11-20 23:20:30,940 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:20:30,941 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:30,941 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:30,941 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:30,941 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:31,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:31,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:31,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:20:31,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:20:31,448 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:20:31,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:20:32,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:20:32,209 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:20:33,025 INFO L354 Elim1Store]: treesize reduction 32, result has 33.3 percent of original size [2021-11-20 23:20:33,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 206 [2021-11-20 23:20:33,544 INFO L354 Elim1Store]: treesize reduction 82, result has 35.9 percent of original size [2021-11-20 23:20:33,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 207 treesize of output 224 [2021-11-20 23:20:36,230 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:37,768 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:37,768 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:37,768 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 31 [2021-11-20 23:20:37,769 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480221976] [2021-11-20 23:20:37,769 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:37,769 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-20 23:20:37,769 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:37,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-20 23:20:37,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1420, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 23:20:37,770 INFO L87 Difference]: Start difference. First operand 89 states and 113 transitions. Second operand has 31 states, 31 states have (on average 1.4838709677419355) internal successors, (46), 31 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) [2021-11-20 23:20:38,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:38,428 INFO L93 Difference]: Finished difference Result 114 states and 144 transitions. [2021-11-20 23:20:38,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-20 23:20:38,429 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.4838709677419355) internal successors, (46), 31 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 19 [2021-11-20 23:20:38,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:38,430 INFO L225 Difference]: With dead ends: 114 [2021-11-20 23:20:38,430 INFO L226 Difference]: Without dead ends: 114 [2021-11-20 23:20:38,431 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 423 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=255, Invalid=2397, Unknown=0, NotChecked=0, Total=2652 [2021-11-20 23:20:38,432 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 53 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 60 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:38,432 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 166 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 182 Invalid, 0 Unknown, 60 Unchecked, 0.1s Time] [2021-11-20 23:20:38,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-20 23:20:38,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 104. [2021-11-20 23:20:38,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 99 states have (on average 1.3535353535353536) internal successors, (134), 103 states have internal predecessors, (134), 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) [2021-11-20 23:20:38,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 134 transitions. [2021-11-20 23:20:38,436 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 134 transitions. Word has length 19 [2021-11-20 23:20:38,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:38,436 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 134 transitions. [2021-11-20 23:20:38,436 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.4838709677419355) internal successors, (46), 31 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) [2021-11-20 23:20:38,437 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 134 transitions. [2021-11-20 23:20:38,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-20 23:20:38,437 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:38,437 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:38,475 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:38,661 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:38,661 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:20:38,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:38,662 INFO L85 PathProgramCache]: Analyzing trace with hash -1881732891, now seen corresponding path program 1 times [2021-11-20 23:20:38,662 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:38,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [128950370] [2021-11-20 23:20:38,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:38,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:38,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:38,737 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:20:38,738 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:38,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [128950370] [2021-11-20 23:20:38,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [128950370] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:20:38,738 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:20:38,738 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:20:38,739 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61956041] [2021-11-20 23:20:38,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:20:38,739 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:20:38,739 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:38,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:20:38,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:20:38,740 INFO L87 Difference]: Start difference. First operand 104 states and 134 transitions. Second operand has 4 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 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) [2021-11-20 23:20:38,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:38,763 INFO L93 Difference]: Finished difference Result 103 states and 133 transitions. [2021-11-20 23:20:38,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:20:38,764 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 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 19 [2021-11-20 23:20:38,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:38,764 INFO L225 Difference]: With dead ends: 103 [2021-11-20 23:20:38,764 INFO L226 Difference]: Without dead ends: 83 [2021-11-20 23:20:38,765 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:20:38,766 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 11 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:38,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 30 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:20:38,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-20 23:20:38,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-11-20 23:20:38,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 79 states have (on average 1.2531645569620253) internal successors, (99), 82 states have internal predecessors, (99), 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) [2021-11-20 23:20:38,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2021-11-20 23:20:38,770 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 19 [2021-11-20 23:20:38,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:38,770 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2021-11-20 23:20:38,770 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 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) [2021-11-20 23:20:38,770 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2021-11-20 23:20:38,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-20 23:20:38,772 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:38,772 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:38,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-20 23:20:38,772 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:20:38,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:38,773 INFO L85 PathProgramCache]: Analyzing trace with hash -290483447, now seen corresponding path program 1 times [2021-11-20 23:20:38,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:38,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811310612] [2021-11-20 23:20:38,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:38,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:38,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:38,903 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:20:38,903 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:38,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811310612] [2021-11-20 23:20:38,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [811310612] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:38,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087981840] [2021-11-20 23:20:38,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:38,903 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:38,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:38,909 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:38,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 23:20:38,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:38,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:20:38,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:39,083 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:20:39,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:39,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-20 23:20:39,235 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:20:39,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087981840] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:39,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [255422507] [2021-11-20 23:20:39,237 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-20 23:20:39,238 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:39,238 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:39,238 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:39,238 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:39,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:39,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:39,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:20:39,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:20:39,774 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:20:39,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:20:40,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:20:40,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:20:41,172 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:20:41,172 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 46 [2021-11-20 23:20:41,550 INFO L354 Elim1Store]: treesize reduction 44, result has 53.2 percent of original size [2021-11-20 23:20:41,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 151 treesize of output 160 [2021-11-20 23:20:42,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:20:42,307 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:20:42,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:20:42,735 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:20:42,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:20:44,226 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:20:44,229 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:20:44,268 INFO L354 Elim1Store]: treesize reduction 153, result has 23.9 percent of original size [2021-11-20 23:20:44,268 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 49 treesize of output 67 [2021-11-20 23:20:45,569 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:20:45,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:20:46,690 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:20:46,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:20:47,234 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:49,732 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:49,732 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:49,732 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 17 [2021-11-20 23:20:49,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660113918] [2021-11-20 23:20:49,733 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:49,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-20 23:20:49,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:49,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-20 23:20:49,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=927, Unknown=0, NotChecked=0, Total=1056 [2021-11-20 23:20:49,734 INFO L87 Difference]: Start difference. First operand 83 states and 99 transitions. Second operand has 18 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 18 states have internal predecessors, (45), 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) [2021-11-20 23:20:50,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:50,002 INFO L93 Difference]: Finished difference Result 103 states and 117 transitions. [2021-11-20 23:20:50,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 23:20:50,003 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 18 states have internal predecessors, (45), 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 20 [2021-11-20 23:20:50,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:50,004 INFO L225 Difference]: With dead ends: 103 [2021-11-20 23:20:50,004 INFO L226 Difference]: Without dead ends: 103 [2021-11-20 23:20:50,005 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 399 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=198, Invalid=1362, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 23:20:50,005 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 128 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:50,005 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [128 Valid, 87 Invalid, 238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 218 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:20:50,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-20 23:20:50,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 93. [2021-11-20 23:20:50,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 89 states have (on average 1.2247191011235956) internal successors, (109), 92 states have internal predecessors, (109), 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) [2021-11-20 23:20:50,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 109 transitions. [2021-11-20 23:20:50,009 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 109 transitions. Word has length 20 [2021-11-20 23:20:50,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:50,009 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 109 transitions. [2021-11-20 23:20:50,009 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 18 states have internal predecessors, (45), 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) [2021-11-20 23:20:50,010 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 109 transitions. [2021-11-20 23:20:50,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-20 23:20:50,010 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:50,010 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:50,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:50,221 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:50,222 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:20:50,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:50,222 INFO L85 PathProgramCache]: Analyzing trace with hash -2039962225, now seen corresponding path program 4 times [2021-11-20 23:20:50,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:50,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218744074] [2021-11-20 23:20:50,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:50,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:50,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:50,382 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 1 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:50,382 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:50,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218744074] [2021-11-20 23:20:50,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1218744074] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:50,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1926074045] [2021-11-20 23:20:50,382 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:20:50,382 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:50,382 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:50,383 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:50,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 23:20:50,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:50,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-20 23:20:50,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:50,458 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:20:50,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-20 23:20:50,461 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:20:50,689 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:50,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:50,958 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 28 [2021-11-20 23:20:50,962 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:50,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1926074045] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:50,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [456665132] [2021-11-20 23:20:50,964 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:20:50,964 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:50,964 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:50,964 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:50,965 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:51,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:51,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:51,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:20:51,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:20:51,473 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:20:51,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:20:52,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:20:52,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:20:52,983 INFO L354 Elim1Store]: treesize reduction 32, result has 33.3 percent of original size [2021-11-20 23:20:52,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 206 [2021-11-20 23:20:53,509 INFO L354 Elim1Store]: treesize reduction 82, result has 35.9 percent of original size [2021-11-20 23:20:53,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 207 treesize of output 224 [2021-11-20 23:20:56,144 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:57,526 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:57,526 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:57,526 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 30 [2021-11-20 23:20:57,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949645229] [2021-11-20 23:20:57,527 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:57,527 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-20 23:20:57,527 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:57,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-20 23:20:57,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=1450, Unknown=0, NotChecked=0, Total=1640 [2021-11-20 23:20:57,528 INFO L87 Difference]: Start difference. First operand 93 states and 109 transitions. Second operand has 32 states, 31 states have (on average 1.967741935483871) internal successors, (61), 31 states have internal predecessors, (61), 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) [2021-11-20 23:20:58,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:58,264 INFO L93 Difference]: Finished difference Result 205 states and 225 transitions. [2021-11-20 23:20:58,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-20 23:20:58,265 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.967741935483871) internal successors, (61), 31 states have internal predecessors, (61), 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 21 [2021-11-20 23:20:58,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:58,270 INFO L225 Difference]: With dead ends: 205 [2021-11-20 23:20:58,270 INFO L226 Difference]: Without dead ends: 201 [2021-11-20 23:20:58,271 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 683 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=387, Invalid=2163, Unknown=0, NotChecked=0, Total=2550 [2021-11-20 23:20:58,272 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 226 mSDsluCounter, 425 mSDsCounter, 0 mSdLazyCounter, 924 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 970 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 924 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:58,274 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [226 Valid, 414 Invalid, 970 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 924 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:20:58,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-11-20 23:20:58,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 123. [2021-11-20 23:20:58,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 119 states have (on average 1.1932773109243697) internal successors, (142), 122 states have internal predecessors, (142), 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) [2021-11-20 23:20:58,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 142 transitions. [2021-11-20 23:20:58,282 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 142 transitions. Word has length 21 [2021-11-20 23:20:58,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:58,282 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 142 transitions. [2021-11-20 23:20:58,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 1.967741935483871) internal successors, (61), 31 states have internal predecessors, (61), 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) [2021-11-20 23:20:58,282 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 142 transitions. [2021-11-20 23:20:58,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-20 23:20:58,283 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:58,283 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:58,307 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:58,491 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-20 23:20:58,492 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:20:58,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:58,492 INFO L85 PathProgramCache]: Analyzing trace with hash -1898610648, now seen corresponding path program 5 times [2021-11-20 23:20:58,492 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:58,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [160881983] [2021-11-20 23:20:58,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:58,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:58,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:58,688 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:20:58,688 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:58,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [160881983] [2021-11-20 23:20:58,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [160881983] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:58,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182177562] [2021-11-20 23:20:58,689 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:20:58,689 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:58,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:58,689 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:58,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 23:20:58,750 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-20 23:20:58,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:20:58,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-20 23:20:58,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:58,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:20:58,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-11-20 23:20:59,018 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:20:59,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 41 [2021-11-20 23:20:59,397 INFO L354 Elim1Store]: treesize reduction 48, result has 5.9 percent of original size [2021-11-20 23:20:59,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 45 treesize of output 27 [2021-11-20 23:20:59,406 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:20:59,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:00,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 56 [2021-11-20 23:21:00,410 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:21:00,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [182177562] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:00,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1695006783] [2021-11-20 23:21:00,411 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:21:00,411 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:00,412 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:00,412 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:00,412 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:00,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:00,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:00,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:21:00,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:21:00,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:00,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 214 treesize of output 206 [2021-11-20 23:21:01,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:21:01,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:21:02,317 INFO L354 Elim1Store]: treesize reduction 32, result has 33.3 percent of original size [2021-11-20 23:21:02,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 206 [2021-11-20 23:21:02,796 INFO L354 Elim1Store]: treesize reduction 82, result has 35.9 percent of original size [2021-11-20 23:21:02,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 207 treesize of output 224 [2021-11-20 23:21:05,359 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:06,844 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:06,844 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:06,844 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 33 [2021-11-20 23:21:06,844 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444120726] [2021-11-20 23:21:06,844 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:06,845 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-20 23:21:06,845 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:06,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-20 23:21:06,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1593, Unknown=1, NotChecked=0, Total=1722 [2021-11-20 23:21:06,846 INFO L87 Difference]: Start difference. First operand 123 states and 142 transitions. Second operand has 33 states, 33 states have (on average 1.6363636363636365) internal successors, (54), 33 states have internal predecessors, (54), 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) [2021-11-20 23:21:07,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:07,287 INFO L93 Difference]: Finished difference Result 224 states and 250 transitions. [2021-11-20 23:21:07,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-20 23:21:07,287 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.6363636363636365) internal successors, (54), 33 states have internal predecessors, (54), 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 [2021-11-20 23:21:07,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:07,288 INFO L225 Difference]: With dead ends: 224 [2021-11-20 23:21:07,288 INFO L226 Difference]: Without dead ends: 214 [2021-11-20 23:21:07,289 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 439 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=192, Invalid=2159, Unknown=1, NotChecked=0, Total=2352 [2021-11-20 23:21:07,290 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 113 mSDsluCounter, 447 mSDsCounter, 0 mSdLazyCounter, 330 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 424 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 84 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:07,290 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 432 Invalid, 424 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 330 Invalid, 0 Unknown, 84 Unchecked, 0.2s Time] [2021-11-20 23:21:07,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-11-20 23:21:07,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 134. [2021-11-20 23:21:07,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 130 states have (on average 1.2076923076923076) internal successors, (157), 133 states have internal predecessors, (157), 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) [2021-11-20 23:21:07,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 157 transitions. [2021-11-20 23:21:07,295 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 157 transitions. Word has length 23 [2021-11-20 23:21:07,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:07,295 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 157 transitions. [2021-11-20 23:21:07,296 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.6363636363636365) internal successors, (54), 33 states have internal predecessors, (54), 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) [2021-11-20 23:21:07,296 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 157 transitions. [2021-11-20 23:21:07,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-20 23:21:07,296 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:07,296 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:07,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:07,517 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-20 23:21:07,517 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:21:07,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:07,518 INFO L85 PathProgramCache]: Analyzing trace with hash -1485927613, now seen corresponding path program 6 times [2021-11-20 23:21:07,518 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:07,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940289541] [2021-11-20 23:21:07,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:07,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:07,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:07,765 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:07,765 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:07,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940289541] [2021-11-20 23:21:07,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1940289541] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:07,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1497173789] [2021-11-20 23:21:07,765 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:21:07,766 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:07,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:07,773 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:07,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-20 23:21:07,837 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:21:07,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:21:07,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-20 23:21:07,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:07,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:21:08,126 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-11-20 23:21:08,208 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:21:08,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 56 treesize of output 55 [2021-11-20 23:21:09,531 INFO L354 Elim1Store]: treesize reduction 256, result has 13.2 percent of original size [2021-11-20 23:21:09,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 104 treesize of output 97 [2021-11-20 23:21:09,572 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 5 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:09,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:10,148 INFO L354 Elim1Store]: treesize reduction 112, result has 0.9 percent of original size [2021-11-20 23:21:10,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 302 treesize of output 274 [2021-11-20 23:21:12,312 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 25 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:12,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1497173789] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:12,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [288031520] [2021-11-20 23:21:12,313 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:21:12,314 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:12,314 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:12,314 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:12,314 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:12,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:12,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:12,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:21:12,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:21:12,783 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:21:12,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:21:13,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:21:13,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:21:14,236 INFO L354 Elim1Store]: treesize reduction 32, result has 33.3 percent of original size [2021-11-20 23:21:14,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 206 [2021-11-20 23:21:14,918 INFO L354 Elim1Store]: treesize reduction 82, result has 35.9 percent of original size [2021-11-20 23:21:14,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 207 treesize of output 224 [2021-11-20 23:21:17,377 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:19,348 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:19,348 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:19,349 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19, 19] total 48 [2021-11-20 23:21:19,349 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763406649] [2021-11-20 23:21:19,349 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:19,353 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-20 23:21:19,354 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:19,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-20 23:21:19,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=2953, Unknown=0, NotChecked=0, Total=3192 [2021-11-20 23:21:19,356 INFO L87 Difference]: Start difference. First operand 134 states and 157 transitions. Second operand has 48 states, 48 states have (on average 1.5) internal successors, (72), 48 states have internal predecessors, (72), 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) [2021-11-20 23:21:21,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:21,346 INFO L93 Difference]: Finished difference Result 193 states and 225 transitions. [2021-11-20 23:21:21,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-20 23:21:21,347 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.5) internal successors, (72), 48 states have internal predecessors, (72), 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 25 [2021-11-20 23:21:21,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:21,348 INFO L225 Difference]: With dead ends: 193 [2021-11-20 23:21:21,348 INFO L226 Difference]: Without dead ends: 179 [2021-11-20 23:21:21,350 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1391 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=565, Invalid=6241, Unknown=0, NotChecked=0, Total=6806 [2021-11-20 23:21:21,351 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 170 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 802 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 316 SdHoareTripleChecker+Invalid, 936 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 802 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 106 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:21,351 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 316 Invalid, 936 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 802 Invalid, 0 Unknown, 106 Unchecked, 0.5s Time] [2021-11-20 23:21:21,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-11-20 23:21:21,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 149. [2021-11-20 23:21:21,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 145 states have (on average 1.2206896551724138) internal successors, (177), 148 states have internal predecessors, (177), 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) [2021-11-20 23:21:21,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 177 transitions. [2021-11-20 23:21:21,356 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 177 transitions. Word has length 25 [2021-11-20 23:21:21,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:21,356 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 177 transitions. [2021-11-20 23:21:21,356 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.5) internal successors, (72), 48 states have internal predecessors, (72), 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) [2021-11-20 23:21:21,356 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 177 transitions. [2021-11-20 23:21:21,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-20 23:21:21,357 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:21,357 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:21,394 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:21,577 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-20 23:21:21,578 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:21:21,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:21,578 INFO L85 PathProgramCache]: Analyzing trace with hash -762772497, now seen corresponding path program 2 times [2021-11-20 23:21:21,578 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:21,578 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804809580] [2021-11-20 23:21:21,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:21,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:21,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:21,873 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:21,873 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:21,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804809580] [2021-11-20 23:21:21,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [804809580] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:21,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1264530074] [2021-11-20 23:21:21,873 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:21:21,873 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:21,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:21,874 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:21,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-20 23:21:21,937 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:21:21,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:21:21,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-20 23:21:21,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:21,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:21:22,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-20 23:21:22,206 INFO L354 Elim1Store]: treesize reduction 34, result has 22.7 percent of original size [2021-11-20 23:21:22,207 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:21:22,320 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-20 23:21:22,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 16 [2021-11-20 23:21:22,331 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:22,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:22,934 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_cstrncat_#t~mem5#1| Int) (|ULTIMATE.start_cstrncat_~s~0#1.offset| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset| |ULTIMATE.start_cstrncat_#t~mem5#1|)) |c_ULTIMATE.start_cstrncat_~s2#1.base|) |c_ULTIMATE.start_cstrncat_~s2#1.offset|) 0)) is different from false [2021-11-20 23:21:23,581 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_cstrncat_#t~mem5#1| Int) (|ULTIMATE.start_cstrncat_~s~0#1.offset| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset| |ULTIMATE.start_cstrncat_#t~mem5#1|)) |c_ULTIMATE.start_cstrncat_~s2#1.base|) (+ |c_ULTIMATE.start_cstrncat_~s2#1.offset| 1)) 0)) is different from false [2021-11-20 23:21:23,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 77 treesize of output 71 [2021-11-20 23:21:23,781 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 4 not checked. [2021-11-20 23:21:23,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1264530074] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:23,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [39959413] [2021-11-20 23:21:23,783 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-20 23:21:23,783 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:23,784 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:23,784 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:23,784 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:23,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:23,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:23,876 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:21:24,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:21:24,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:24,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 214 treesize of output 206 [2021-11-20 23:21:24,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:21:24,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:21:25,533 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:21:25,534 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 49 [2021-11-20 23:21:25,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:25,890 INFO L354 Elim1Store]: treesize reduction 46, result has 32.4 percent of original size [2021-11-20 23:21:25,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 155 treesize of output 141 [2021-11-20 23:21:26,323 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:21:26,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:21:26,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:21:26,834 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:21:26,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:21:28,131 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:21:28,134 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:21:28,174 INFO L354 Elim1Store]: treesize reduction 153, result has 23.9 percent of original size [2021-11-20 23:21:28,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 49 treesize of output 67 [2021-11-20 23:21:29,652 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:21:29,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:21:30,933 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:21:30,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:21:31,374 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:34,059 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:34,059 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:34,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 12] total 29 [2021-11-20 23:21:34,059 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514717875] [2021-11-20 23:21:34,059 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:34,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-20 23:21:34,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:34,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-20 23:21:34,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1563, Unknown=2, NotChecked=162, Total=1892 [2021-11-20 23:21:34,061 INFO L87 Difference]: Start difference. First operand 149 states and 177 transitions. Second operand has 29 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 29 states have internal predecessors, (60), 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) [2021-11-20 23:21:35,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:35,156 INFO L93 Difference]: Finished difference Result 173 states and 200 transitions. [2021-11-20 23:21:35,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-20 23:21:35,157 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 29 states have internal predecessors, (60), 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 25 [2021-11-20 23:21:35,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:35,158 INFO L225 Difference]: With dead ends: 173 [2021-11-20 23:21:35,158 INFO L226 Difference]: Without dead ends: 144 [2021-11-20 23:21:35,160 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 2 IntricatePredicates, 2 DeprecatedPredicates, 769 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=328, Invalid=2540, Unknown=2, NotChecked=210, Total=3080 [2021-11-20 23:21:35,160 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 76 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 125 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:35,161 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 136 Invalid, 383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 207 Invalid, 0 Unknown, 125 Unchecked, 0.2s Time] [2021-11-20 23:21:35,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-11-20 23:21:35,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 144. [2021-11-20 23:21:35,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 140 states have (on average 1.2214285714285715) internal successors, (171), 143 states have internal predecessors, (171), 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) [2021-11-20 23:21:35,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 171 transitions. [2021-11-20 23:21:35,165 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 171 transitions. Word has length 25 [2021-11-20 23:21:35,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:35,165 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 171 transitions. [2021-11-20 23:21:35,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 29 states have internal predecessors, (60), 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) [2021-11-20 23:21:35,166 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 171 transitions. [2021-11-20 23:21:35,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-20 23:21:35,166 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:35,166 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:35,205 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:35,393 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-20 23:21:35,394 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:21:35,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:35,394 INFO L85 PathProgramCache]: Analyzing trace with hash 688632906, now seen corresponding path program 3 times [2021-11-20 23:21:35,394 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:35,394 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [568767429] [2021-11-20 23:21:35,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:35,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:35,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:35,648 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:21:35,648 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:35,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [568767429] [2021-11-20 23:21:35,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [568767429] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:35,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [572594992] [2021-11-20 23:21:35,649 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:21:35,649 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:35,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:35,649 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:35,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-20 23:21:35,696 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:21:35,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:21:35,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-20 23:21:35,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:35,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:21:35,711 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:21:35,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:21:35,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-20 23:21:36,028 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-11-20 23:21:36,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 25 [2021-11-20 23:21:36,051 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:21:36,051 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:36,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 152 treesize of output 144 [2021-11-20 23:21:36,716 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:21:36,716 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [572594992] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:36,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1241582853] [2021-11-20 23:21:36,718 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-20 23:21:36,718 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:36,719 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:36,719 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:36,719 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:36,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:36,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:36,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:21:37,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:21:37,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:37,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 214 treesize of output 206 [2021-11-20 23:21:37,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:21:37,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:21:38,526 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:21:38,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 49 [2021-11-20 23:21:38,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:38,806 INFO L354 Elim1Store]: treesize reduction 46, result has 32.4 percent of original size [2021-11-20 23:21:38,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 155 treesize of output 141 [2021-11-20 23:21:39,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:21:39,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:21:39,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:21:39,817 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:21:39,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:21:41,444 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:21:41,447 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:21:41,487 INFO L354 Elim1Store]: treesize reduction 153, result has 23.9 percent of original size [2021-11-20 23:21:41,487 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 49 treesize of output 67 [2021-11-20 23:21:42,557 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:21:42,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:21:43,699 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:21:43,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:21:44,377 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:47,072 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:47,073 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:47,073 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 32 [2021-11-20 23:21:47,073 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851196946] [2021-11-20 23:21:47,073 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:47,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-20 23:21:47,074 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:47,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-20 23:21:47,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1993, Unknown=0, NotChecked=0, Total=2162 [2021-11-20 23:21:47,075 INFO L87 Difference]: Start difference. First operand 144 states and 171 transitions. Second operand has 32 states, 32 states have (on average 1.96875) internal successors, (63), 32 states have internal predecessors, (63), 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) [2021-11-20 23:21:48,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:48,110 INFO L93 Difference]: Finished difference Result 260 states and 299 transitions. [2021-11-20 23:21:48,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-20 23:21:48,111 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.96875) internal successors, (63), 32 states have internal predecessors, (63), 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 27 [2021-11-20 23:21:48,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:48,111 INFO L225 Difference]: With dead ends: 260 [2021-11-20 23:21:48,112 INFO L226 Difference]: Without dead ends: 186 [2021-11-20 23:21:48,113 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1262 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=580, Invalid=4112, Unknown=0, NotChecked=0, Total=4692 [2021-11-20 23:21:48,114 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 212 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 321 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 603 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 156 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:48,114 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [212 Valid, 105 Invalid, 603 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 321 Invalid, 0 Unknown, 156 Unchecked, 0.2s Time] [2021-11-20 23:21:48,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2021-11-20 23:21:48,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 176. [2021-11-20 23:21:48,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 172 states have (on average 1.2034883720930232) internal successors, (207), 175 states have internal predecessors, (207), 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) [2021-11-20 23:21:48,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 207 transitions. [2021-11-20 23:21:48,119 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 207 transitions. Word has length 27 [2021-11-20 23:21:48,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:48,120 INFO L470 AbstractCegarLoop]: Abstraction has 176 states and 207 transitions. [2021-11-20 23:21:48,120 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.96875) internal successors, (63), 32 states have internal predecessors, (63), 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) [2021-11-20 23:21:48,120 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 207 transitions. [2021-11-20 23:21:48,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-20 23:21:48,121 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:48,121 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:48,145 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:48,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:48,329 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:21:48,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:48,330 INFO L85 PathProgramCache]: Analyzing trace with hash 1183895159, now seen corresponding path program 7 times [2021-11-20 23:21:48,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:48,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1762684985] [2021-11-20 23:21:48,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:48,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:48,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:48,568 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:48,568 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:48,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1762684985] [2021-11-20 23:21:48,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1762684985] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:48,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1225373145] [2021-11-20 23:21:48,569 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:21:48,569 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:48,569 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:48,570 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:48,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-20 23:21:48,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:48,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-20 23:21:48,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:48,681 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:21:48,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-20 23:21:48,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:21:49,087 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:49,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:49,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 28 [2021-11-20 23:21:49,567 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 25 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:49,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1225373145] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:49,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1569743501] [2021-11-20 23:21:49,568 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:21:49,569 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:49,569 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:49,569 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:49,569 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:49,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:49,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:49,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:21:49,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:21:50,021 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:21:50,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:21:50,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:21:50,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:21:51,658 INFO L354 Elim1Store]: treesize reduction 32, result has 33.3 percent of original size [2021-11-20 23:21:51,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 206 [2021-11-20 23:21:52,315 INFO L354 Elim1Store]: treesize reduction 82, result has 35.9 percent of original size [2021-11-20 23:21:52,315 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 207 treesize of output 224 [2021-11-20 23:21:54,351 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:55,905 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:55,905 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:55,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 42 [2021-11-20 23:21:55,906 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288102853] [2021-11-20 23:21:55,906 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:55,906 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-20 23:21:55,906 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:55,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-20 23:21:55,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=2472, Unknown=0, NotChecked=0, Total=2756 [2021-11-20 23:21:55,908 INFO L87 Difference]: Start difference. First operand 176 states and 207 transitions. Second operand has 44 states, 43 states have (on average 1.9767441860465116) internal successors, (85), 43 states have internal predecessors, (85), 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) [2021-11-20 23:21:57,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:57,357 INFO L93 Difference]: Finished difference Result 397 states and 439 transitions. [2021-11-20 23:21:57,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-20 23:21:57,358 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 1.9767441860465116) internal successors, (85), 43 states have internal predecessors, (85), 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 29 [2021-11-20 23:21:57,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:57,360 INFO L225 Difference]: With dead ends: 397 [2021-11-20 23:21:57,361 INFO L226 Difference]: Without dead ends: 384 [2021-11-20 23:21:57,362 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1087 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=767, Invalid=4203, Unknown=0, NotChecked=0, Total=4970 [2021-11-20 23:21:57,363 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 458 mSDsluCounter, 589 mSDsCounter, 0 mSdLazyCounter, 1326 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 458 SdHoareTripleChecker+Valid, 586 SdHoareTripleChecker+Invalid, 1409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 1326 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:57,363 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [458 Valid, 586 Invalid, 1409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 1326 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 23:21:57,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 384 states. [2021-11-20 23:21:57,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 384 to 208. [2021-11-20 23:21:57,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 204 states have (on average 1.1862745098039216) internal successors, (242), 207 states have internal predecessors, (242), 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) [2021-11-20 23:21:57,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 242 transitions. [2021-11-20 23:21:57,371 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 242 transitions. Word has length 29 [2021-11-20 23:21:57,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:57,371 INFO L470 AbstractCegarLoop]: Abstraction has 208 states and 242 transitions. [2021-11-20 23:21:57,372 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 43 states have (on average 1.9767441860465116) internal successors, (85), 43 states have internal predecessors, (85), 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) [2021-11-20 23:21:57,372 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 242 transitions. [2021-11-20 23:21:57,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-20 23:21:57,372 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:57,373 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:57,406 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:57,586 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:57,587 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:21:57,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:57,587 INFO L85 PathProgramCache]: Analyzing trace with hash 1651596666, now seen corresponding path program 4 times [2021-11-20 23:21:57,587 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:57,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134167953] [2021-11-20 23:21:57,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:57,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:57,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:57,739 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:21:57,740 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:57,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134167953] [2021-11-20 23:21:57,740 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134167953] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:57,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [858588092] [2021-11-20 23:21:57,740 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:21:57,740 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:57,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:57,742 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:57,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-20 23:21:57,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:57,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-20 23:21:57,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:57,958 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:21:57,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:58,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-20 23:21:58,182 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:21:58,182 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [858588092] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:58,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1961332975] [2021-11-20 23:21:58,184 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-20 23:21:58,184 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:58,184 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:58,184 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:58,184 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:58,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:58,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:58,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:21:58,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:21:58,707 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:21:58,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:21:59,405 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:21:59,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:22:00,140 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:22:00,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 46 [2021-11-20 23:22:00,521 INFO L354 Elim1Store]: treesize reduction 44, result has 53.2 percent of original size [2021-11-20 23:22:00,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 151 treesize of output 160 [2021-11-20 23:22:01,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:22:02,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:22:02,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:22:02,362 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:22:02,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:22:03,798 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:22:03,801 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:22:03,841 INFO L354 Elim1Store]: treesize reduction 153, result has 23.9 percent of original size [2021-11-20 23:22:03,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 49 treesize of output 67 [2021-11-20 23:22:05,193 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:22:05,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:22:06,110 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:22:06,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:22:06,846 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:22:09,413 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:22:09,413 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:22:09,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 20 [2021-11-20 23:22:09,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217953745] [2021-11-20 23:22:09,413 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:22:09,414 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-20 23:22:09,414 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:22:09,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-20 23:22:09,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=1124, Unknown=0, NotChecked=0, Total=1260 [2021-11-20 23:22:09,415 INFO L87 Difference]: Start difference. First operand 208 states and 242 transitions. Second operand has 21 states, 20 states have (on average 2.95) internal successors, (59), 21 states have internal predecessors, (59), 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) [2021-11-20 23:22:09,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:22:09,838 INFO L93 Difference]: Finished difference Result 257 states and 285 transitions. [2021-11-20 23:22:09,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-20 23:22:09,838 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.95) internal successors, (59), 21 states have internal predecessors, (59), 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 29 [2021-11-20 23:22:09,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:22:09,840 INFO L225 Difference]: With dead ends: 257 [2021-11-20 23:22:09,840 INFO L226 Difference]: Without dead ends: 257 [2021-11-20 23:22:09,840 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 501 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=266, Invalid=1896, Unknown=0, NotChecked=0, Total=2162 [2021-11-20 23:22:09,841 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 337 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 324 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 337 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:22:09,841 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [337 Valid, 115 Invalid, 360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 324 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:22:09,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-11-20 23:22:09,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 234. [2021-11-20 23:22:09,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 230 states have (on average 1.1695652173913043) internal successors, (269), 233 states have internal predecessors, (269), 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) [2021-11-20 23:22:09,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 269 transitions. [2021-11-20 23:22:09,848 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 269 transitions. Word has length 29 [2021-11-20 23:22:09,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:22:09,849 INFO L470 AbstractCegarLoop]: Abstraction has 234 states and 269 transitions. [2021-11-20 23:22:09,849 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.95) internal successors, (59), 21 states have internal predecessors, (59), 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) [2021-11-20 23:22:09,849 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 269 transitions. [2021-11-20 23:22:09,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-20 23:22:09,850 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:22:09,850 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:22:09,880 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-20 23:22:10,069 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-20 23:22:10,070 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:22:10,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:22:10,070 INFO L85 PathProgramCache]: Analyzing trace with hash -443085040, now seen corresponding path program 8 times [2021-11-20 23:22:10,070 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:22:10,070 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766700633] [2021-11-20 23:22:10,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:22:10,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:22:10,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:10,622 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 9 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:10,622 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:22:10,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766700633] [2021-11-20 23:22:10,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766700633] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:22:10,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241981227] [2021-11-20 23:22:10,622 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:22:10,622 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:22:10,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:22:10,623 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:22:10,628 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-20 23:22:10,712 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-20 23:22:10,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:22:10,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-20 23:22:10,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:22:10,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:22:10,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-11-20 23:22:11,025 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:22:11,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 41 [2021-11-20 23:22:11,635 INFO L354 Elim1Store]: treesize reduction 48, result has 5.9 percent of original size [2021-11-20 23:22:11,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 45 treesize of output 27 [2021-11-20 23:22:11,673 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 18 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:22:11,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:22:22,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 56 [2021-11-20 23:22:22,797 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 18 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:22:22,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241981227] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:22:22,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1621324277] [2021-11-20 23:22:22,799 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:22:22,799 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:22:22,799 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:22:22,799 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:22:22,800 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:22:22,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:22:22,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:22:22,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:22:23,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:22:23,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:22:23,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 214 treesize of output 206 [2021-11-20 23:22:23,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:22:23,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:22:24,650 INFO L354 Elim1Store]: treesize reduction 32, result has 33.3 percent of original size [2021-11-20 23:22:24,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 206 [2021-11-20 23:22:25,119 INFO L354 Elim1Store]: treesize reduction 82, result has 35.9 percent of original size [2021-11-20 23:22:25,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 207 treesize of output 224 [2021-11-20 23:22:27,796 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:22:29,724 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:22:29,724 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:22:29,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 18] total 50 [2021-11-20 23:22:29,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107742841] [2021-11-20 23:22:29,724 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:22:29,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-20 23:22:29,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:22:29,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-20 23:22:29,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3239, Unknown=13, NotChecked=0, Total=3422 [2021-11-20 23:22:29,726 INFO L87 Difference]: Start difference. First operand 234 states and 269 transitions. Second operand has 50 states, 50 states have (on average 1.76) internal successors, (88), 50 states have internal predecessors, (88), 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) [2021-11-20 23:22:31,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:22:31,650 INFO L93 Difference]: Finished difference Result 531 states and 586 transitions. [2021-11-20 23:22:31,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-20 23:22:31,651 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.76) internal successors, (88), 50 states have internal predecessors, (88), 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 31 [2021-11-20 23:22:31,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:22:31,653 INFO L225 Difference]: With dead ends: 531 [2021-11-20 23:22:31,653 INFO L226 Difference]: Without dead ends: 492 [2021-11-20 23:22:31,654 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1067 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=363, Invalid=6104, Unknown=13, NotChecked=0, Total=6480 [2021-11-20 23:22:31,655 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 259 mSDsluCounter, 1602 mSDsCounter, 0 mSdLazyCounter, 1922 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 1504 SdHoareTripleChecker+Invalid, 2376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 1922 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 430 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:22:31,655 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [259 Valid, 1504 Invalid, 2376 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 1922 Invalid, 0 Unknown, 430 Unchecked, 0.8s Time] [2021-11-20 23:22:31,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2021-11-20 23:22:31,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 253. [2021-11-20 23:22:31,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 249 states have (on average 1.176706827309237) internal successors, (293), 252 states have internal predecessors, (293), 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) [2021-11-20 23:22:31,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 293 transitions. [2021-11-20 23:22:31,664 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 293 transitions. Word has length 31 [2021-11-20 23:22:31,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:22:31,665 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 293 transitions. [2021-11-20 23:22:31,665 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.76) internal successors, (88), 50 states have internal predecessors, (88), 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) [2021-11-20 23:22:31,665 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 293 transitions. [2021-11-20 23:22:31,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-20 23:22:31,666 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:22:31,666 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:22:31,705 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-20 23:22:31,881 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-20 23:22:31,881 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:22:31,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:22:31,882 INFO L85 PathProgramCache]: Analyzing trace with hash -255987270, now seen corresponding path program 1 times [2021-11-20 23:22:31,882 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:22:31,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1090770740] [2021-11-20 23:22:31,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:22:31,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:22:31,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:32,069 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:22:32,069 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:22:32,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1090770740] [2021-11-20 23:22:32,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1090770740] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:22:32,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1514007406] [2021-11-20 23:22:32,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:22:32,070 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:22:32,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:22:32,071 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:22:32,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-20 23:22:32,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:32,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-20 23:22:32,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:22:32,155 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:22:32,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-20 23:22:32,158 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:22:32,441 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:22:32,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:22:32,918 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:22:32,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1514007406] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:22:32,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1242556888] [2021-11-20 23:22:32,919 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:22:32,920 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:22:32,920 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:22:32,920 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:22:32,920 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:22:33,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:22:33,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:22:33,048 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:22:33,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:22:33,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:22:33,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 214 treesize of output 206 [2021-11-20 23:22:33,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:22:34,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:22:34,729 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:22:34,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 46 [2021-11-20 23:22:35,063 INFO L354 Elim1Store]: treesize reduction 44, result has 53.2 percent of original size [2021-11-20 23:22:35,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 151 treesize of output 160 [2021-11-20 23:22:35,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:22:36,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:22:36,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:22:36,560 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:22:36,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:22:39,639 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-20 23:22:39,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-20 23:22:40,846 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:22:40,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:22:41,987 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:22:41,987 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:22:42,883 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:22:45,127 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:22:45,127 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:22:45,127 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 30 [2021-11-20 23:22:45,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510391853] [2021-11-20 23:22:45,128 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:22:45,128 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-20 23:22:45,128 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:22:45,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-20 23:22:45,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1783, Unknown=0, NotChecked=0, Total=1980 [2021-11-20 23:22:45,129 INFO L87 Difference]: Start difference. First operand 253 states and 293 transitions. Second operand has 31 states, 30 states have (on average 2.933333333333333) internal successors, (88), 31 states have internal predecessors, (88), 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) [2021-11-20 23:22:46,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:22:46,698 INFO L93 Difference]: Finished difference Result 386 states and 435 transitions. [2021-11-20 23:22:46,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-20 23:22:46,698 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 2.933333333333333) internal successors, (88), 31 states have internal predecessors, (88), 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 32 [2021-11-20 23:22:46,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:22:46,700 INFO L225 Difference]: With dead ends: 386 [2021-11-20 23:22:46,700 INFO L226 Difference]: Without dead ends: 380 [2021-11-20 23:22:46,701 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1732 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1120, Invalid=5360, Unknown=0, NotChecked=0, Total=6480 [2021-11-20 23:22:46,702 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 254 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 499 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 596 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 499 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:22:46,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [254 Valid, 73 Invalid, 596 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 499 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:22:46,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2021-11-20 23:22:46,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 343. [2021-11-20 23:22:46,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 339 states have (on average 1.1533923303834808) internal successors, (391), 342 states have internal predecessors, (391), 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) [2021-11-20 23:22:46,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 391 transitions. [2021-11-20 23:22:46,712 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 391 transitions. Word has length 32 [2021-11-20 23:22:46,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:22:46,713 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 391 transitions. [2021-11-20 23:22:46,713 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 2.933333333333333) internal successors, (88), 31 states have internal predecessors, (88), 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) [2021-11-20 23:22:46,713 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 391 transitions. [2021-11-20 23:22:46,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-20 23:22:46,714 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:22:46,714 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:22:46,746 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-20 23:22:46,941 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:22:46,942 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:22:46,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:22:46,942 INFO L85 PathProgramCache]: Analyzing trace with hash -255996306, now seen corresponding path program 1 times [2021-11-20 23:22:46,942 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:22:46,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299008106] [2021-11-20 23:22:46,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:22:46,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:22:46,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:47,161 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:22:47,161 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:22:47,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299008106] [2021-11-20 23:22:47,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299008106] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:22:47,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1765223368] [2021-11-20 23:22:47,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:22:47,161 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:22:47,161 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:22:47,162 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:22:47,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-20 23:22:47,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:47,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-20 23:22:47,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:22:47,241 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:22:47,241 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-20 23:22:47,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:22:47,816 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 1 proven. 18 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:22:47,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:22:48,681 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 1 proven. 18 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:22:48,681 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1765223368] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:22:48,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1473778713] [2021-11-20 23:22:48,683 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-20 23:22:48,683 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:22:48,683 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:22:48,683 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:22:48,683 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:22:48,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:22:48,790 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:22:48,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:22:48,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:22:49,136 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:22:49,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:22:49,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:22:50,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:22:50,656 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:22:50,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 46 [2021-11-20 23:22:51,047 INFO L354 Elim1Store]: treesize reduction 44, result has 53.2 percent of original size [2021-11-20 23:22:51,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 151 treesize of output 160 [2021-11-20 23:22:51,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:22:51,926 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:22:52,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:22:52,261 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:22:52,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:22:55,463 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-20 23:22:55,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-20 23:22:56,669 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:22:56,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:22:57,973 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:22:57,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:22:58,531 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:23:01,537 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:23:01,538 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:23:01,538 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16, 16] total 38 [2021-11-20 23:23:01,538 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148451951] [2021-11-20 23:23:01,538 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:23:01,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-20 23:23:01,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:23:01,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-20 23:23:01,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=2545, Unknown=0, NotChecked=0, Total=2862 [2021-11-20 23:23:01,539 INFO L87 Difference]: Start difference. First operand 343 states and 391 transitions. Second operand has 39 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 39 states have internal predecessors, (81), 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) [2021-11-20 23:23:03,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:23:03,865 INFO L93 Difference]: Finished difference Result 407 states and 459 transitions. [2021-11-20 23:23:03,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-20 23:23:03,865 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 39 states have internal predecessors, (81), 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 32 [2021-11-20 23:23:03,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:23:03,867 INFO L225 Difference]: With dead ends: 407 [2021-11-20 23:23:03,867 INFO L226 Difference]: Without dead ends: 407 [2021-11-20 23:23:03,868 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2277 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=1455, Invalid=6917, Unknown=0, NotChecked=0, Total=8372 [2021-11-20 23:23:03,869 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 414 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 414 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 630 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:23:03,869 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [414 Valid, 49 Invalid, 630 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 490 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:23:03,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2021-11-20 23:23:03,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 326. [2021-11-20 23:23:03,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 322 states have (on average 1.170807453416149) internal successors, (377), 325 states have internal predecessors, (377), 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) [2021-11-20 23:23:03,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 377 transitions. [2021-11-20 23:23:03,877 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 377 transitions. Word has length 32 [2021-11-20 23:23:03,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:23:03,877 INFO L470 AbstractCegarLoop]: Abstraction has 326 states and 377 transitions. [2021-11-20 23:23:03,878 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 39 states have internal predecessors, (81), 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) [2021-11-20 23:23:03,878 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 377 transitions. [2021-11-20 23:23:03,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-20 23:23:03,879 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:23:03,879 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:23:03,912 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-11-20 23:23:04,097 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-20 23:23:04,097 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:23:04,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:23:04,098 INFO L85 PathProgramCache]: Analyzing trace with hash 53024798, now seen corresponding path program 5 times [2021-11-20 23:23:04,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:23:04,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411183249] [2021-11-20 23:23:04,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:23:04,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:23:04,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:23:04,651 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 12 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:04,651 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:23:04,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411183249] [2021-11-20 23:23:04,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [411183249] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:23:04,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1477073246] [2021-11-20 23:23:04,652 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:23:04,652 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:04,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:23:04,652 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:23:04,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-20 23:23:04,722 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-20 23:23:04,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:23:04,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-20 23:23:04,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:23:05,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:23:05,301 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:23:05,334 INFO L354 Elim1Store]: treesize reduction 74, result has 26.7 percent of original size [2021-11-20 23:23:05,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 65 treesize of output 59 [2021-11-20 23:23:05,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:05,607 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:23:05,627 INFO L354 Elim1Store]: treesize reduction 65, result has 12.2 percent of original size [2021-11-20 23:23:05,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 54 treesize of output 53 [2021-11-20 23:23:05,864 INFO L354 Elim1Store]: treesize reduction 40, result has 7.0 percent of original size [2021-11-20 23:23:05,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 46 treesize of output 27 [2021-11-20 23:23:05,874 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:05,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:23:06,408 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-20 23:23:06,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 489 treesize of output 481 [2021-11-20 23:23:06,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 4 [2021-11-20 23:23:07,524 INFO L354 Elim1Store]: treesize reduction 10, result has 65.5 percent of original size [2021-11-20 23:23:07,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 60 treesize of output 70 [2021-11-20 23:23:07,997 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 18 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:07,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1477073246] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:23:07,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1846306109] [2021-11-20 23:23:07,998 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-20 23:23:07,998 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:23:07,998 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:23:07,998 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:23:07,999 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:23:08,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:08,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:08,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:23:08,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:23:08,452 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:23:08,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:23:09,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:23:09,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:23:09,882 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:23:09,883 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 46 [2021-11-20 23:23:10,250 INFO L354 Elim1Store]: treesize reduction 44, result has 53.2 percent of original size [2021-11-20 23:23:10,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 151 treesize of output 160 [2021-11-20 23:23:11,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:23:11,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:23:11,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:23:12,034 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:23:12,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:23:13,427 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:23:13,430 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:23:13,470 INFO L354 Elim1Store]: treesize reduction 153, result has 23.9 percent of original size [2021-11-20 23:23:13,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 49 treesize of output 67 [2021-11-20 23:23:14,833 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:23:14,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:23:15,909 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:23:15,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:23:16,678 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:23:19,999 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:23:19,999 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:23:19,999 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 21, 20] total 50 [2021-11-20 23:23:19,999 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637492003] [2021-11-20 23:23:19,999 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:23:20,000 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-20 23:23:20,000 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:23:20,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-20 23:23:20,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=3847, Unknown=0, NotChecked=0, Total=4160 [2021-11-20 23:23:20,001 INFO L87 Difference]: Start difference. First operand 326 states and 377 transitions. Second operand has 50 states, 50 states have (on average 1.72) internal successors, (86), 50 states have internal predecessors, (86), 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) [2021-11-20 23:23:20,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:23:20,752 INFO L93 Difference]: Finished difference Result 328 states and 378 transitions. [2021-11-20 23:23:20,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-20 23:23:20,753 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.72) internal successors, (86), 50 states have internal predecessors, (86), 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 34 [2021-11-20 23:23:20,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:23:20,754 INFO L225 Difference]: With dead ends: 328 [2021-11-20 23:23:20,754 INFO L226 Difference]: Without dead ends: 313 [2021-11-20 23:23:20,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1491 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=447, Invalid=5405, Unknown=0, NotChecked=0, Total=5852 [2021-11-20 23:23:20,755 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 51 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 213 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:23:20,755 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 166 Invalid, 392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 162 Invalid, 0 Unknown, 213 Unchecked, 0.1s Time] [2021-11-20 23:23:20,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2021-11-20 23:23:20,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 313. [2021-11-20 23:23:20,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 313 states, 309 states have (on average 1.174757281553398) internal successors, (363), 312 states have internal predecessors, (363), 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) [2021-11-20 23:23:20,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 363 transitions. [2021-11-20 23:23:20,761 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 363 transitions. Word has length 34 [2021-11-20 23:23:20,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:23:20,762 INFO L470 AbstractCegarLoop]: Abstraction has 313 states and 363 transitions. [2021-11-20 23:23:20,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.72) internal successors, (86), 50 states have internal predecessors, (86), 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) [2021-11-20 23:23:20,762 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 363 transitions. [2021-11-20 23:23:20,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-20 23:23:20,763 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:23:20,763 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:23:20,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-20 23:23:20,989 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:20,990 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:23:20,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:23:20,990 INFO L85 PathProgramCache]: Analyzing trace with hash 1362473668, now seen corresponding path program 9 times [2021-11-20 23:23:20,990 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:23:20,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711031832] [2021-11-20 23:23:20,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:23:20,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:23:21,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:23:21,363 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 21 proven. 78 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:23:21,364 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:23:21,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711031832] [2021-11-20 23:23:21,364 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711031832] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:23:21,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [12027858] [2021-11-20 23:23:21,364 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:23:21,364 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:21,364 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:23:21,365 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:23:21,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-20 23:23:21,422 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:23:21,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:23:21,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-20 23:23:21,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:23:21,440 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:23:21,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-11-20 23:23:21,842 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:23:21,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 49 [2021-11-20 23:23:28,198 INFO L354 Elim1Store]: treesize reduction 449, result has 8.2 percent of original size [2021-11-20 23:23:28,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 36 case distinctions, treesize of input 113 treesize of output 95 [2021-11-20 23:23:28,216 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 21 proven. 76 refuted. 2 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:23:28,216 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:23:29,158 INFO L354 Elim1Store]: treesize reduction 240, result has 0.4 percent of original size [2021-11-20 23:23:29,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 418 treesize of output 378 [2021-11-20 23:23:30,288 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 63 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:23:30,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [12027858] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:23:30,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1069353453] [2021-11-20 23:23:30,294 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:23:30,294 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:23:30,296 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:23:30,296 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:23:30,296 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:23:30,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:30,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:30,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:23:30,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:23:30,711 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:30,712 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 214 treesize of output 206 [2021-11-20 23:23:31,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:23:31,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:23:32,120 INFO L354 Elim1Store]: treesize reduction 32, result has 33.3 percent of original size [2021-11-20 23:23:32,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 206 [2021-11-20 23:23:32,932 INFO L354 Elim1Store]: treesize reduction 82, result has 35.9 percent of original size [2021-11-20 23:23:32,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 207 treesize of output 224 [2021-11-20 23:23:35,528 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:23:37,594 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:23:37,595 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:23:37,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 25, 25] total 63 [2021-11-20 23:23:37,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376997125] [2021-11-20 23:23:37,595 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:23:37,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-20 23:23:37,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:23:37,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-20 23:23:37,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=4702, Unknown=2, NotChecked=0, Total=5112 [2021-11-20 23:23:37,597 INFO L87 Difference]: Start difference. First operand 313 states and 363 transitions. Second operand has 63 states, 63 states have (on average 1.492063492063492) internal successors, (94), 63 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) [2021-11-20 23:23:40,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:23:40,725 INFO L93 Difference]: Finished difference Result 371 states and 429 transitions. [2021-11-20 23:23:40,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-20 23:23:40,725 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.492063492063492) internal successors, (94), 63 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 35 [2021-11-20 23:23:40,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:23:40,726 INFO L225 Difference]: With dead ends: 371 [2021-11-20 23:23:40,727 INFO L226 Difference]: Without dead ends: 339 [2021-11-20 23:23:40,728 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1819 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=818, Invalid=9482, Unknown=2, NotChecked=0, Total=10302 [2021-11-20 23:23:40,729 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 104 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 727 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 787 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 727 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:23:40,729 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 192 Invalid, 787 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 727 Invalid, 0 Unknown, 51 Unchecked, 0.4s Time] [2021-11-20 23:23:40,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2021-11-20 23:23:40,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 334. [2021-11-20 23:23:40,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 330 states have (on average 1.187878787878788) internal successors, (392), 333 states have internal predecessors, (392), 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) [2021-11-20 23:23:40,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 392 transitions. [2021-11-20 23:23:40,737 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 392 transitions. Word has length 35 [2021-11-20 23:23:40,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:23:40,737 INFO L470 AbstractCegarLoop]: Abstraction has 334 states and 392 transitions. [2021-11-20 23:23:40,737 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.492063492063492) internal successors, (94), 63 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) [2021-11-20 23:23:40,737 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 392 transitions. [2021-11-20 23:23:40,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-20 23:23:40,738 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:23:40,738 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:23:40,762 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-20 23:23:40,949 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-20 23:23:40,950 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:23:40,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:23:40,950 INFO L85 PathProgramCache]: Analyzing trace with hash 851942947, now seen corresponding path program 6 times [2021-11-20 23:23:40,950 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:23:40,950 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [520239386] [2021-11-20 23:23:40,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:23:40,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:23:40,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:23:41,469 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 9 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:41,469 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:23:41,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [520239386] [2021-11-20 23:23:41,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [520239386] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:23:41,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [68659439] [2021-11-20 23:23:41,469 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:23:41,469 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:41,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:23:41,471 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:23:41,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-20 23:23:41,541 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:23:41,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:23:41,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-20 23:23:41,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:23:41,564 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:23:41,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-20 23:23:41,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:23:41,821 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:23:41,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-20 23:23:42,017 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-20 23:23:42,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 26 [2021-11-20 23:23:42,104 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-11-20 23:23:42,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 25 [2021-11-20 23:23:42,114 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 12 proven. 16 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-20 23:23:42,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:23:49,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1272 treesize of output 1240 [2021-11-20 23:23:51,711 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 9 proven. 17 refuted. 2 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-20 23:23:51,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [68659439] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:23:51,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1585889544] [2021-11-20 23:23:51,713 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-20 23:23:51,713 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:23:51,714 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:23:51,714 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:23:51,714 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:23:51,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:51,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:51,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:23:51,957 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:23:52,164 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:23:52,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:23:52,793 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:23:53,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:23:53,784 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:23:53,784 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 49 [2021-11-20 23:23:54,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:54,078 INFO L354 Elim1Store]: treesize reduction 46, result has 32.4 percent of original size [2021-11-20 23:23:54,078 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 155 treesize of output 141 [2021-11-20 23:23:54,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:23:54,893 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:23:55,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:23:55,199 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:23:55,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:23:56,664 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:23:56,667 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:23:56,710 INFO L354 Elim1Store]: treesize reduction 153, result has 23.9 percent of original size [2021-11-20 23:23:56,710 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 49 treesize of output 67 [2021-11-20 23:23:58,232 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:23:58,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:23:59,331 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:23:59,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:23:59,926 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:24:02,879 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:24:02,879 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:24:02,879 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 15, 16] total 43 [2021-11-20 23:24:02,879 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048414061] [2021-11-20 23:24:02,879 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:24:02,879 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-20 23:24:02,879 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:24:02,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-20 23:24:02,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=3084, Unknown=5, NotChecked=0, Total=3306 [2021-11-20 23:24:02,880 INFO L87 Difference]: Start difference. First operand 334 states and 392 transitions. Second operand has 43 states, 43 states have (on average 2.046511627906977) internal successors, (88), 43 states have internal predecessors, (88), 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) [2021-11-20 23:24:06,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:24:06,455 INFO L93 Difference]: Finished difference Result 639 states and 720 transitions. [2021-11-20 23:24:06,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-20 23:24:06,456 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.046511627906977) internal successors, (88), 43 states have internal predecessors, (88), 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 36 [2021-11-20 23:24:06,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:24:06,458 INFO L225 Difference]: With dead ends: 639 [2021-11-20 23:24:06,458 INFO L226 Difference]: Without dead ends: 511 [2021-11-20 23:24:06,459 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 72 SyntacticMatches, 5 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3516 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=1448, Invalid=11429, Unknown=5, NotChecked=0, Total=12882 [2021-11-20 23:24:06,460 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 599 mSDsluCounter, 327 mSDsCounter, 0 mSdLazyCounter, 1101 mSolverCounterSat, 353 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 599 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 1829 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 353 IncrementalHoareTripleChecker+Valid, 1101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 375 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:24:06,460 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [599 Valid, 326 Invalid, 1829 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [353 Valid, 1101 Invalid, 0 Unknown, 375 Unchecked, 0.6s Time] [2021-11-20 23:24:06,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 511 states. [2021-11-20 23:24:06,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 511 to 439. [2021-11-20 23:24:06,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 439 states, 435 states have (on average 1.1724137931034482) internal successors, (510), 438 states have internal predecessors, (510), 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) [2021-11-20 23:24:06,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 439 states to 439 states and 510 transitions. [2021-11-20 23:24:06,470 INFO L78 Accepts]: Start accepts. Automaton has 439 states and 510 transitions. Word has length 36 [2021-11-20 23:24:06,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:24:06,470 INFO L470 AbstractCegarLoop]: Abstraction has 439 states and 510 transitions. [2021-11-20 23:24:06,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.046511627906977) internal successors, (88), 43 states have internal predecessors, (88), 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) [2021-11-20 23:24:06,470 INFO L276 IsEmpty]: Start isEmpty. Operand 439 states and 510 transitions. [2021-11-20 23:24:06,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-20 23:24:06,471 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:24:06,471 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:24:06,506 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-20 23:24:06,697 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-20 23:24:06,697 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:24:06,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:24:06,698 INFO L85 PathProgramCache]: Analyzing trace with hash 359132511, now seen corresponding path program 10 times [2021-11-20 23:24:06,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:24:06,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1590393469] [2021-11-20 23:24:06,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:24:06,698 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:24:06,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:24:07,063 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 25 proven. 88 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:07,063 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:24:07,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1590393469] [2021-11-20 23:24:07,063 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1590393469] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:24:07,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1825827609] [2021-11-20 23:24:07,064 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:24:07,064 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:24:07,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:24:07,066 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:24:07,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-20 23:24:07,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:24:07,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-20 23:24:07,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:24:07,162 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:24:07,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-20 23:24:07,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:24:07,691 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:07,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:24:08,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 28 [2021-11-20 23:24:08,363 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 49 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:08,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1825827609] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:24:08,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [123961544] [2021-11-20 23:24:08,364 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:24:08,364 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:24:08,364 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:24:08,364 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:24:08,364 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:24:08,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:24:08,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:24:08,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:24:08,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:24:08,811 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:24:08,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:24:09,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:24:09,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:24:10,394 INFO L354 Elim1Store]: treesize reduction 32, result has 33.3 percent of original size [2021-11-20 23:24:10,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 206 [2021-11-20 23:24:10,977 INFO L354 Elim1Store]: treesize reduction 82, result has 35.9 percent of original size [2021-11-20 23:24:10,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 207 treesize of output 224 [2021-11-20 23:24:13,760 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:24:15,396 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:24:15,396 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:24:15,396 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 54 [2021-11-20 23:24:15,396 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373876309] [2021-11-20 23:24:15,397 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:24:15,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-20 23:24:15,401 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:24:15,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-20 23:24:15,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=450, Invalid=3710, Unknown=0, NotChecked=0, Total=4160 [2021-11-20 23:24:15,403 INFO L87 Difference]: Start difference. First operand 439 states and 510 transitions. Second operand has 56 states, 55 states have (on average 1.981818181818182) internal successors, (109), 55 states have internal predecessors, (109), 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) [2021-11-20 23:24:17,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:24:17,250 INFO L93 Difference]: Finished difference Result 1102 states and 1222 transitions. [2021-11-20 23:24:17,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-20 23:24:17,251 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 1.981818181818182) internal successors, (109), 55 states have internal predecessors, (109), 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 37 [2021-11-20 23:24:17,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:24:17,254 INFO L225 Difference]: With dead ends: 1102 [2021-11-20 23:24:17,254 INFO L226 Difference]: Without dead ends: 1070 [2021-11-20 23:24:17,255 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2054 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1131, Invalid=6009, Unknown=0, NotChecked=0, Total=7140 [2021-11-20 23:24:17,255 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 874 mSDsluCounter, 1152 mSDsCounter, 0 mSdLazyCounter, 2577 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 874 SdHoareTripleChecker+Valid, 1115 SdHoareTripleChecker+Invalid, 2743 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 2577 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:24:17,255 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [874 Valid, 1115 Invalid, 2743 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 2577 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-20 23:24:17,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1070 states. [2021-11-20 23:24:17,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1070 to 506. [2021-11-20 23:24:17,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 506 states, 502 states have (on average 1.157370517928287) internal successors, (581), 505 states have internal predecessors, (581), 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) [2021-11-20 23:24:17,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 506 states to 506 states and 581 transitions. [2021-11-20 23:24:17,271 INFO L78 Accepts]: Start accepts. Automaton has 506 states and 581 transitions. Word has length 37 [2021-11-20 23:24:17,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:24:17,271 INFO L470 AbstractCegarLoop]: Abstraction has 506 states and 581 transitions. [2021-11-20 23:24:17,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 55 states have (on average 1.981818181818182) internal successors, (109), 55 states have internal predecessors, (109), 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) [2021-11-20 23:24:17,271 INFO L276 IsEmpty]: Start isEmpty. Operand 506 states and 581 transitions. [2021-11-20 23:24:17,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-20 23:24:17,272 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:24:17,273 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:24:17,310 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-20 23:24:17,497 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-20 23:24:17,497 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:24:17,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:24:17,498 INFO L85 PathProgramCache]: Analyzing trace with hash 1091621299, now seen corresponding path program 7 times [2021-11-20 23:24:17,498 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:24:17,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063855232] [2021-11-20 23:24:17,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:24:17,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:24:17,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:24:17,683 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 1 proven. 32 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-20 23:24:17,684 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:24:17,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2063855232] [2021-11-20 23:24:17,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2063855232] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:24:17,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2070222849] [2021-11-20 23:24:17,684 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:24:17,684 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:24:17,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:24:17,685 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:24:17,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-20 23:24:17,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:24:17,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-20 23:24:17,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:24:17,970 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 4 proven. 29 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-20 23:24:17,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:24:18,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-20 23:24:18,200 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 4 proven. 29 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-20 23:24:18,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2070222849] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:24:18,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [153319166] [2021-11-20 23:24:18,202 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-20 23:24:18,202 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:24:18,202 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:24:18,202 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:24:18,202 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:24:18,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:24:18,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:24:18,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:24:18,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:24:18,678 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:24:18,678 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:24:19,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:24:19,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:24:20,168 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:24:20,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 46 [2021-11-20 23:24:20,558 INFO L354 Elim1Store]: treesize reduction 44, result has 53.2 percent of original size [2021-11-20 23:24:20,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 151 treesize of output 160 [2021-11-20 23:24:21,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:24:21,895 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:24:22,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:24:22,354 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:24:22,354 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:24:23,726 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:24:23,731 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:24:23,773 INFO L354 Elim1Store]: treesize reduction 153, result has 23.9 percent of original size [2021-11-20 23:24:23,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 49 treesize of output 67 [2021-11-20 23:24:25,211 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:24:25,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:24:26,392 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:24:26,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:24:27,052 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:24:29,731 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:24:29,731 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:24:29,732 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 24 [2021-11-20 23:24:29,732 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523285968] [2021-11-20 23:24:29,732 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:24:29,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-20 23:24:29,732 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:24:29,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-20 23:24:29,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1404, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 23:24:29,733 INFO L87 Difference]: Start difference. First operand 506 states and 581 transitions. Second operand has 25 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 25 states have internal predecessors, (73), 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) [2021-11-20 23:24:30,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:24:30,316 INFO L93 Difference]: Finished difference Result 587 states and 651 transitions. [2021-11-20 23:24:30,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-20 23:24:30,317 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 25 states have internal predecessors, (73), 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 38 [2021-11-20 23:24:30,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:24:30,319 INFO L225 Difference]: With dead ends: 587 [2021-11-20 23:24:30,319 INFO L226 Difference]: Without dead ends: 587 [2021-11-20 23:24:30,319 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 716 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=371, Invalid=2599, Unknown=0, NotChecked=0, Total=2970 [2021-11-20 23:24:30,320 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 355 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 502 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 355 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 539 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:24:30,320 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [355 Valid, 198 Invalid, 539 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 502 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:24:30,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 587 states. [2021-11-20 23:24:30,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 587 to 542. [2021-11-20 23:24:30,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 542 states, 538 states have (on average 1.1468401486988848) internal successors, (617), 541 states have internal predecessors, (617), 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) [2021-11-20 23:24:30,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 542 states to 542 states and 617 transitions. [2021-11-20 23:24:30,329 INFO L78 Accepts]: Start accepts. Automaton has 542 states and 617 transitions. Word has length 38 [2021-11-20 23:24:30,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:24:30,330 INFO L470 AbstractCegarLoop]: Abstraction has 542 states and 617 transitions. [2021-11-20 23:24:30,330 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 25 states have internal predecessors, (73), 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) [2021-11-20 23:24:30,330 INFO L276 IsEmpty]: Start isEmpty. Operand 542 states and 617 transitions. [2021-11-20 23:24:30,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-20 23:24:30,331 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:24:30,331 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:24:30,381 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-20 23:24:30,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-20 23:24:30,554 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:24:30,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:24:30,554 INFO L85 PathProgramCache]: Analyzing trace with hash 725443149, now seen corresponding path program 2 times [2021-11-20 23:24:30,554 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:24:30,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [584896964] [2021-11-20 23:24:30,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:24:30,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:24:30,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:24:30,775 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:24:30,775 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:24:30,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [584896964] [2021-11-20 23:24:30,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [584896964] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:24:30,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1618955565] [2021-11-20 23:24:30,776 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:24:30,776 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:24:30,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:24:30,778 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:24:30,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-20 23:24:30,911 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-20 23:24:30,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:24:30,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-20 23:24:30,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:24:30,950 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:24:30,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-20 23:24:30,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:24:31,477 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:24:31,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:24:32,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 28 [2021-11-20 23:24:32,113 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 9 proven. 23 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:24:32,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1618955565] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:24:32,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1070367778] [2021-11-20 23:24:32,114 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:24:32,114 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:24:32,114 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:24:32,114 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:24:32,114 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:24:32,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:24:32,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:24:32,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:24:32,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:24:32,574 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:24:32,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:24:33,260 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:24:33,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:24:34,072 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:24:34,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 49 [2021-11-20 23:24:34,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:24:34,379 INFO L354 Elim1Store]: treesize reduction 46, result has 32.4 percent of original size [2021-11-20 23:24:34,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 155 treesize of output 141 [2021-11-20 23:24:34,926 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:24:35,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:24:35,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:24:35,529 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:24:35,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:24:38,708 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-20 23:24:38,709 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-20 23:24:39,929 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:24:39,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:24:41,296 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:24:41,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:24:42,230 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:24:44,766 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:24:44,766 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:24:44,766 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 41 [2021-11-20 23:24:44,766 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169037988] [2021-11-20 23:24:44,766 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:24:44,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-20 23:24:44,767 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:24:44,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-20 23:24:44,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=2854, Unknown=0, NotChecked=0, Total=3080 [2021-11-20 23:24:44,767 INFO L87 Difference]: Start difference. First operand 542 states and 617 transitions. Second operand has 42 states, 41 states have (on average 2.6097560975609757) internal successors, (107), 42 states have internal predecessors, (107), 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) [2021-11-20 23:24:47,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:24:47,540 INFO L93 Difference]: Finished difference Result 715 states and 795 transitions. [2021-11-20 23:24:47,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-20 23:24:47,541 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 2.6097560975609757) internal successors, (107), 42 states have internal predecessors, (107), 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 38 [2021-11-20 23:24:47,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:24:47,543 INFO L225 Difference]: With dead ends: 715 [2021-11-20 23:24:47,543 INFO L226 Difference]: Without dead ends: 687 [2021-11-20 23:24:47,544 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2133 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=1382, Invalid=8124, Unknown=0, NotChecked=0, Total=9506 [2021-11-20 23:24:47,544 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 648 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 1505 mSolverCounterSat, 175 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 648 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 1680 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 175 IncrementalHoareTripleChecker+Valid, 1505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:24:47,544 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [648 Valid, 247 Invalid, 1680 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [175 Valid, 1505 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 23:24:47,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 687 states. [2021-11-20 23:24:47,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 687 to 508. [2021-11-20 23:24:47,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 508 states, 504 states have (on average 1.1468253968253967) internal successors, (578), 507 states have internal predecessors, (578), 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) [2021-11-20 23:24:47,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 508 states to 508 states and 578 transitions. [2021-11-20 23:24:47,556 INFO L78 Accepts]: Start accepts. Automaton has 508 states and 578 transitions. Word has length 38 [2021-11-20 23:24:47,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:24:47,557 INFO L470 AbstractCegarLoop]: Abstraction has 508 states and 578 transitions. [2021-11-20 23:24:47,557 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 41 states have (on average 2.6097560975609757) internal successors, (107), 42 states have internal predecessors, (107), 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) [2021-11-20 23:24:47,557 INFO L276 IsEmpty]: Start isEmpty. Operand 508 states and 578 transitions. [2021-11-20 23:24:47,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-20 23:24:47,558 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:24:47,558 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:24:47,596 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-20 23:24:47,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:24:47,777 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:24:47,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:24:47,777 INFO L85 PathProgramCache]: Analyzing trace with hash 1528959992, now seen corresponding path program 11 times [2021-11-20 23:24:47,777 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:24:47,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608214674] [2021-11-20 23:24:47,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:24:47,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:24:47,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:24:48,204 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 24 proven. 105 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:24:48,204 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:24:48,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608214674] [2021-11-20 23:24:48,205 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [608214674] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:24:48,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066702632] [2021-11-20 23:24:48,205 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:24:48,205 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:24:48,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:24:48,210 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:24:48,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-20 23:24:48,346 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-20 23:24:48,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:24:48,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-20 23:24:48,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:24:48,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:24:48,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-11-20 23:24:48,848 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:24:48,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 41 [2021-11-20 23:24:49,625 INFO L354 Elim1Store]: treesize reduction 48, result has 5.9 percent of original size [2021-11-20 23:24:49,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 45 treesize of output 27 [2021-11-20 23:24:49,632 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 24 proven. 105 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:24:49,632 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:24:53,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 56 [2021-11-20 23:24:53,507 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 24 proven. 105 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:24:53,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2066702632] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:24:53,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1077106641] [2021-11-20 23:24:53,509 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:24:53,509 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:24:53,509 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:24:53,509 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:24:53,509 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:24:53,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:24:53,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:24:53,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:24:53,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:24:53,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:24:53,981 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 214 treesize of output 206 [2021-11-20 23:24:54,484 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:24:54,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:24:55,380 INFO L354 Elim1Store]: treesize reduction 32, result has 33.3 percent of original size [2021-11-20 23:24:55,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 206 [2021-11-20 23:24:55,925 INFO L354 Elim1Store]: treesize reduction 82, result has 35.9 percent of original size [2021-11-20 23:24:55,926 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 207 treesize of output 224 [2021-11-20 23:24:58,490 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:25:00,327 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:25:00,328 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:25:00,328 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 53 [2021-11-20 23:25:00,328 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407209576] [2021-11-20 23:25:00,328 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:25:00,328 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-20 23:25:00,329 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:25:00,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-20 23:25:00,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=3593, Unknown=5, NotChecked=0, Total=3782 [2021-11-20 23:25:00,330 INFO L87 Difference]: Start difference. First operand 508 states and 578 transitions. Second operand has 53 states, 53 states have (on average 1.7735849056603774) internal successors, (94), 53 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) [2021-11-20 23:25:01,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:25:01,366 INFO L93 Difference]: Finished difference Result 1119 states and 1231 transitions. [2021-11-20 23:25:01,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-20 23:25:01,367 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.7735849056603774) internal successors, (94), 53 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 39 [2021-11-20 23:25:01,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:25:01,370 INFO L225 Difference]: With dead ends: 1119 [2021-11-20 23:25:01,370 INFO L226 Difference]: Without dead ends: 1083 [2021-11-20 23:25:01,371 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 979 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=277, Invalid=5120, Unknown=5, NotChecked=0, Total=5402 [2021-11-20 23:25:01,371 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 242 mSDsluCounter, 2230 mSDsCounter, 0 mSdLazyCounter, 1342 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 242 SdHoareTripleChecker+Valid, 2083 SdHoareTripleChecker+Invalid, 2092 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1342 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 738 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:25:01,371 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [242 Valid, 2083 Invalid, 2092 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1342 Invalid, 0 Unknown, 738 Unchecked, 0.5s Time] [2021-11-20 23:25:01,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1083 states. [2021-11-20 23:25:01,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1083 to 537. [2021-11-20 23:25:01,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 537 states, 533 states have (on average 1.1557223264540337) internal successors, (616), 536 states have internal predecessors, (616), 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) [2021-11-20 23:25:01,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537 states to 537 states and 616 transitions. [2021-11-20 23:25:01,383 INFO L78 Accepts]: Start accepts. Automaton has 537 states and 616 transitions. Word has length 39 [2021-11-20 23:25:01,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:25:01,383 INFO L470 AbstractCegarLoop]: Abstraction has 537 states and 616 transitions. [2021-11-20 23:25:01,384 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.7735849056603774) internal successors, (94), 53 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) [2021-11-20 23:25:01,384 INFO L276 IsEmpty]: Start isEmpty. Operand 537 states and 616 transitions. [2021-11-20 23:25:01,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-20 23:25:01,385 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:25:01,385 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:25:01,420 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-20 23:25:01,613 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:25:01,613 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:25:01,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:25:01,614 INFO L85 PathProgramCache]: Analyzing trace with hash -265320173, now seen corresponding path program 12 times [2021-11-20 23:25:01,614 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:25:01,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404825166] [2021-11-20 23:25:01,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:25:01,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:25:01,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:25:01,966 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 36 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:25:01,966 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:25:01,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404825166] [2021-11-20 23:25:01,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1404825166] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:25:01,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1747684131] [2021-11-20 23:25:01,966 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:25:01,967 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:25:01,967 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:25:01,967 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:25:01,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-20 23:25:02,038 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:25:02,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:25:02,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 92 conjunts are in the unsatisfiable core [2021-11-20 23:25:02,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:25:02,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:25:02,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-20 23:25:02,463 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:25:02,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 43 [2021-11-20 23:25:04,564 INFO L354 Elim1Store]: treesize reduction 679, result has 7.1 percent of original size [2021-11-20 23:25:04,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 0 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 55 case distinctions, treesize of input 130 treesize of output 112 [2021-11-20 23:25:04,655 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 9 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:25:04,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:25:11,789 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,789 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,790 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,790 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,790 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,791 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,791 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,791 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,792 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,792 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,792 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,793 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,793 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,793 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,794 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,794 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,794 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,795 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,795 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,796 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,796 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,796 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,797 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,797 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,797 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,798 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,798 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,798 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,799 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,799 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,799 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,800 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,800 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,800 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,801 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,801 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:25:11,805 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-20 23:25:11,805 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 36 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 36 case distinctions, treesize of input 540 treesize of output 488 [2021-11-20 23:25:12,980 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 81 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:25:12,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1747684131] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:25:12,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [809807067] [2021-11-20 23:25:12,982 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:25:12,982 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:25:12,982 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:25:12,982 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:25:12,982 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:25:13,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:25:13,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:25:13,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:25:13,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:25:13,489 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:25:13,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:25:14,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:25:14,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:25:15,021 INFO L354 Elim1Store]: treesize reduction 32, result has 33.3 percent of original size [2021-11-20 23:25:15,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 206 [2021-11-20 23:25:15,716 INFO L354 Elim1Store]: treesize reduction 82, result has 35.9 percent of original size [2021-11-20 23:25:15,716 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 207 treesize of output 224 [2021-11-20 23:25:18,182 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:25:20,475 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:25:20,475 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:25:20,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 31, 31] total 80 [2021-11-20 23:25:20,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161968935] [2021-11-20 23:25:20,476 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:25:20,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-20 23:25:20,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:25:20,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-20 23:25:20,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=549, Invalid=7281, Unknown=2, NotChecked=0, Total=7832 [2021-11-20 23:25:20,477 INFO L87 Difference]: Start difference. First operand 537 states and 616 transitions. Second operand has 80 states, 80 states have (on average 1.5) internal successors, (120), 80 states have internal predecessors, (120), 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) [2021-11-20 23:25:23,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:25:23,920 INFO L93 Difference]: Finished difference Result 716 states and 816 transitions. [2021-11-20 23:25:23,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-11-20 23:25:23,920 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 1.5) internal successors, (120), 80 states have internal predecessors, (120), 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 41 [2021-11-20 23:25:23,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:25:23,923 INFO L225 Difference]: With dead ends: 716 [2021-11-20 23:25:23,923 INFO L226 Difference]: Without dead ends: 665 [2021-11-20 23:25:23,924 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4201 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=1240, Invalid=16050, Unknown=2, NotChecked=0, Total=17292 [2021-11-20 23:25:23,924 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 310 mSDsluCounter, 756 mSDsCounter, 0 mSdLazyCounter, 1319 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 310 SdHoareTripleChecker+Valid, 575 SdHoareTripleChecker+Invalid, 1705 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 1319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 356 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:25:23,925 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [310 Valid, 575 Invalid, 1705 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 1319 Invalid, 0 Unknown, 356 Unchecked, 0.6s Time] [2021-11-20 23:25:23,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 665 states. [2021-11-20 23:25:23,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 665 to 574. [2021-11-20 23:25:23,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 574 states, 570 states have (on average 1.1649122807017545) internal successors, (664), 573 states have internal predecessors, (664), 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) [2021-11-20 23:25:23,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 574 states to 574 states and 664 transitions. [2021-11-20 23:25:23,934 INFO L78 Accepts]: Start accepts. Automaton has 574 states and 664 transitions. Word has length 41 [2021-11-20 23:25:23,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:25:23,934 INFO L470 AbstractCegarLoop]: Abstraction has 574 states and 664 transitions. [2021-11-20 23:25:23,935 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 1.5) internal successors, (120), 80 states have internal predecessors, (120), 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) [2021-11-20 23:25:23,935 INFO L276 IsEmpty]: Start isEmpty. Operand 574 states and 664 transitions. [2021-11-20 23:25:23,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-20 23:25:23,936 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:25:23,936 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:25:23,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-20 23:25:24,161 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-11-20 23:25:24,161 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:25:24,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:25:24,162 INFO L85 PathProgramCache]: Analyzing trace with hash -1023713871, now seen corresponding path program 3 times [2021-11-20 23:25:24,162 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:25:24,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [708578828] [2021-11-20 23:25:24,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:25:24,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:25:24,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:25:24,220 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-20 23:25:24,220 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:25:24,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [708578828] [2021-11-20 23:25:24,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [708578828] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:25:24,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [632963364] [2021-11-20 23:25:24,221 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:25:24,221 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:25:24,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:25:24,238 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:25:24,249 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-20 23:25:24,298 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:25:24,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:25:24,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-20 23:25:24,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:25:24,318 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:25:24,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 20 [2021-11-20 23:25:24,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:25:25,084 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 6 proven. 33 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:25:25,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:25:25,765 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 9 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:25:25,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [632963364] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:25:25,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [233721151] [2021-11-20 23:25:25,766 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:25:25,766 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:25:25,766 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:25:25,767 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:25:25,767 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:25:25,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:25:25,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:25:25,889 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:25:26,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:25:26,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:25:26,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 214 treesize of output 206 [2021-11-20 23:25:26,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:25:26,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:25:27,685 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:25:27,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 49 [2021-11-20 23:25:27,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:25:27,999 INFO L354 Elim1Store]: treesize reduction 46, result has 32.4 percent of original size [2021-11-20 23:25:27,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 155 treesize of output 141 [2021-11-20 23:25:28,487 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:25:28,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:25:28,929 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:25:29,117 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:25:29,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:25:32,148 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-20 23:25:32,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-20 23:25:33,479 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:25:33,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:25:34,681 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:25:34,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:25:35,716 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:25:38,201 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:25:38,201 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:25:38,202 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 16, 15] total 37 [2021-11-20 23:25:38,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353527807] [2021-11-20 23:25:38,202 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:25:38,202 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-20 23:25:38,202 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:25:38,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-20 23:25:38,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=2347, Unknown=0, NotChecked=0, Total=2550 [2021-11-20 23:25:38,203 INFO L87 Difference]: Start difference. First operand 574 states and 664 transitions. Second operand has 37 states, 37 states have (on average 2.7837837837837838) internal successors, (103), 37 states have internal predecessors, (103), 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) [2021-11-20 23:25:40,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:25:40,760 INFO L93 Difference]: Finished difference Result 723 states and 818 transitions. [2021-11-20 23:25:40,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-20 23:25:40,761 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.7837837837837838) internal successors, (103), 37 states have internal predecessors, (103), 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 41 [2021-11-20 23:25:40,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:25:40,763 INFO L225 Difference]: With dead ends: 723 [2021-11-20 23:25:40,763 INFO L226 Difference]: Without dead ends: 718 [2021-11-20 23:25:40,764 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1959 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=1296, Invalid=7446, Unknown=0, NotChecked=0, Total=8742 [2021-11-20 23:25:40,764 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 434 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 603 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 434 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 932 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 603 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 210 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:25:40,765 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [434 Valid, 91 Invalid, 932 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 603 Invalid, 0 Unknown, 210 Unchecked, 0.4s Time] [2021-11-20 23:25:40,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 718 states. [2021-11-20 23:25:40,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 718 to 559. [2021-11-20 23:25:40,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 559 states, 555 states have (on average 1.163963963963964) internal successors, (646), 558 states have internal predecessors, (646), 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) [2021-11-20 23:25:40,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 559 states to 559 states and 646 transitions. [2021-11-20 23:25:40,774 INFO L78 Accepts]: Start accepts. Automaton has 559 states and 646 transitions. Word has length 41 [2021-11-20 23:25:40,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:25:40,775 INFO L470 AbstractCegarLoop]: Abstraction has 559 states and 646 transitions. [2021-11-20 23:25:40,775 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.7837837837837838) internal successors, (103), 37 states have internal predecessors, (103), 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) [2021-11-20 23:25:40,775 INFO L276 IsEmpty]: Start isEmpty. Operand 559 states and 646 transitions. [2021-11-20 23:25:40,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-20 23:25:40,776 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:25:40,777 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:25:40,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-20 23:25:40,997 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-11-20 23:25:40,998 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:25:40,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:25:40,998 INFO L85 PathProgramCache]: Analyzing trace with hash 1742417561, now seen corresponding path program 4 times [2021-11-20 23:25:40,998 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:25:40,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [514968733] [2021-11-20 23:25:40,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:25:40,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:25:41,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:25:41,238 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:25:41,238 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:25:41,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [514968733] [2021-11-20 23:25:41,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [514968733] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:25:41,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1401059410] [2021-11-20 23:25:41,239 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:25:41,239 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:25:41,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:25:41,240 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:25:41,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-20 23:25:41,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:25:41,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-20 23:25:41,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:25:41,318 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:25:41,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-20 23:25:41,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:25:41,834 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 9 proven. 38 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:25:41,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:25:42,561 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 9 proven. 38 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:25:42,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1401059410] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:25:42,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1430080002] [2021-11-20 23:25:42,563 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:25:42,563 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:25:42,563 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:25:42,563 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:25:42,563 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:25:42,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:25:42,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:25:42,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:25:42,831 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:25:43,028 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:25:43,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:25:43,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:25:43,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:25:44,523 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:25:44,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 46 [2021-11-20 23:25:44,895 INFO L354 Elim1Store]: treesize reduction 44, result has 53.2 percent of original size [2021-11-20 23:25:44,896 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 151 treesize of output 160 [2021-11-20 23:25:45,885 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:25:46,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:25:46,280 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:25:46,546 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:25:46,547 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:25:49,678 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-20 23:25:49,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-20 23:25:51,097 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:25:51,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:25:52,206 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:25:52,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:25:53,180 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:25:55,674 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:25:55,674 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:25:55,674 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 45 [2021-11-20 23:25:55,674 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945216913] [2021-11-20 23:25:55,674 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:25:55,674 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-20 23:25:55,674 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:25:55,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-20 23:25:55,675 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=279, Invalid=3261, Unknown=0, NotChecked=0, Total=3540 [2021-11-20 23:25:55,675 INFO L87 Difference]: Start difference. First operand 559 states and 646 transitions. Second operand has 46 states, 45 states have (on average 2.6222222222222222) internal successors, (118), 46 states have internal predecessors, (118), 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) [2021-11-20 23:25:59,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:25:59,786 INFO L93 Difference]: Finished difference Result 897 states and 999 transitions. [2021-11-20 23:25:59,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-11-20 23:25:59,787 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 2.6222222222222222) internal successors, (118), 46 states have internal predecessors, (118), 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 42 [2021-11-20 23:25:59,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:25:59,790 INFO L225 Difference]: With dead ends: 897 [2021-11-20 23:25:59,790 INFO L226 Difference]: Without dead ends: 893 [2021-11-20 23:25:59,791 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5413 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=3146, Invalid=16876, Unknown=0, NotChecked=0, Total=20022 [2021-11-20 23:25:59,792 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 627 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 2173 mSolverCounterSat, 203 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 627 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 2376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 203 IncrementalHoareTripleChecker+Valid, 2173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:25:59,792 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [627 Valid, 220 Invalid, 2376 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [203 Valid, 2173 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-20 23:25:59,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 893 states. [2021-11-20 23:25:59,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 893 to 578. [2021-11-20 23:25:59,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 578 states, 574 states have (on average 1.1620209059233448) internal successors, (667), 577 states have internal predecessors, (667), 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) [2021-11-20 23:25:59,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 578 states to 578 states and 667 transitions. [2021-11-20 23:25:59,802 INFO L78 Accepts]: Start accepts. Automaton has 578 states and 667 transitions. Word has length 42 [2021-11-20 23:25:59,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:25:59,803 INFO L470 AbstractCegarLoop]: Abstraction has 578 states and 667 transitions. [2021-11-20 23:25:59,803 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 2.6222222222222222) internal successors, (118), 46 states have internal predecessors, (118), 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) [2021-11-20 23:25:59,803 INFO L276 IsEmpty]: Start isEmpty. Operand 578 states and 667 transitions. [2021-11-20 23:25:59,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-20 23:25:59,804 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:25:59,804 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:25:59,841 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2021-11-20 23:26:00,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-11-20 23:26:00,026 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:26:00,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:26:00,026 INFO L85 PathProgramCache]: Analyzing trace with hash 1742408525, now seen corresponding path program 2 times [2021-11-20 23:26:00,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:26:00,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922303786] [2021-11-20 23:26:00,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:26:00,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:26:00,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:26:00,474 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:26:00,474 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:26:00,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922303786] [2021-11-20 23:26:00,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922303786] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:26:00,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [40332669] [2021-11-20 23:26:00,478 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:26:00,478 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:26:00,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:26:00,479 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:26:00,495 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-20 23:26:00,594 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-20 23:26:00,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:26:00,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-20 23:26:00,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:26:00,632 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:26:00,632 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-20 23:26:00,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:26:01,516 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 9 proven. 40 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:26:01,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:26:02,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 45 [2021-11-20 23:26:02,722 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 16 proven. 33 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:26:02,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [40332669] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:26:02,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [773568699] [2021-11-20 23:26:02,726 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-20 23:26:02,726 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:26:02,726 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:26:02,727 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:26:02,727 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:26:02,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:26:02,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:26:02,813 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:26:02,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:26:03,200 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:26:03,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:26:03,813 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:26:04,042 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:26:04,765 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:26:04,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 49 [2021-11-20 23:26:05,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:26:05,144 INFO L354 Elim1Store]: treesize reduction 46, result has 32.4 percent of original size [2021-11-20 23:26:05,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 155 treesize of output 141 [2021-11-20 23:26:05,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:26:05,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:26:05,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:26:06,123 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:26:06,123 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:26:09,534 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-20 23:26:09,534 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-20 23:26:10,953 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:26:10,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:26:12,001 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:26:12,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:26:12,771 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:26:16,054 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:26:16,054 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:26:16,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 57 [2021-11-20 23:26:16,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178945760] [2021-11-20 23:26:16,055 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:26:16,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-20 23:26:16,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:26:16,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-20 23:26:16,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=4874, Unknown=0, NotChecked=0, Total=5256 [2021-11-20 23:26:16,056 INFO L87 Difference]: Start difference. First operand 578 states and 667 transitions. Second operand has 58 states, 57 states have (on average 2.1052631578947367) internal successors, (120), 58 states have internal predecessors, (120), 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) [2021-11-20 23:26:25,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:26:25,878 INFO L93 Difference]: Finished difference Result 877 states and 969 transitions. [2021-11-20 23:26:25,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-11-20 23:26:25,878 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 2.1052631578947367) internal successors, (120), 58 states have internal predecessors, (120), 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 42 [2021-11-20 23:26:25,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:26:25,881 INFO L225 Difference]: With dead ends: 877 [2021-11-20 23:26:25,881 INFO L226 Difference]: Without dead ends: 849 [2021-11-20 23:26:25,882 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9312 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=4552, Invalid=28390, Unknown=0, NotChecked=0, Total=32942 [2021-11-20 23:26:25,883 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 1977 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 2892 mSolverCounterSat, 584 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1977 SdHoareTripleChecker+Valid, 316 SdHoareTripleChecker+Invalid, 3476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 584 IncrementalHoareTripleChecker+Valid, 2892 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:26:25,883 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1977 Valid, 316 Invalid, 3476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [584 Valid, 2892 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2021-11-20 23:26:25,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 849 states. [2021-11-20 23:26:25,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 849 to 592. [2021-11-20 23:26:25,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 592 states, 588 states have (on average 1.1598639455782314) internal successors, (682), 591 states have internal predecessors, (682), 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) [2021-11-20 23:26:25,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 592 states to 592 states and 682 transitions. [2021-11-20 23:26:25,894 INFO L78 Accepts]: Start accepts. Automaton has 592 states and 682 transitions. Word has length 42 [2021-11-20 23:26:25,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:26:25,894 INFO L470 AbstractCegarLoop]: Abstraction has 592 states and 682 transitions. [2021-11-20 23:26:25,894 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 57 states have (on average 2.1052631578947367) internal successors, (120), 58 states have internal predecessors, (120), 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) [2021-11-20 23:26:25,895 INFO L276 IsEmpty]: Start isEmpty. Operand 592 states and 682 transitions. [2021-11-20 23:26:25,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-20 23:26:25,896 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:26:25,896 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:26:25,934 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-20 23:26:26,121 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-20 23:26:26,122 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:26:26,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:26:26,122 INFO L85 PathProgramCache]: Analyzing trace with hash -1017749627, now seen corresponding path program 8 times [2021-11-20 23:26:26,122 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:26:26,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [668618360] [2021-11-20 23:26:26,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:26:26,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:26:26,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:26:26,946 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 18 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:26:26,947 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:26:26,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [668618360] [2021-11-20 23:26:26,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [668618360] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:26:26,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1267439019] [2021-11-20 23:26:26,947 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:26:26,947 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:26:26,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:26:26,949 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:26:26,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-20 23:26:27,060 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-20 23:26:27,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:26:27,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 82 conjunts are in the unsatisfiable core [2021-11-20 23:26:27,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:26:27,076 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:26:27,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:26:27,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:26:27,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:26:27,708 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:26:27,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-20 23:26:27,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 23:26:27,795 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 16 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:26:27,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:26:28,379 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_cstrncat_#t~mem5#1| Int) (|ULTIMATE.start_cstrncat_~s~0#1.offset| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset| |ULTIMATE.start_cstrncat_#t~mem5#1|)) |c_ULTIMATE.start_cstrncat_~s2#1.base|) |c_ULTIMATE.start_cstrncat_~s2#1.offset|) 0)) is different from false [2021-11-20 23:26:40,494 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_cstrncat_~s~0#1.offset_332| Int) (|v_ULTIMATE.start_cstrncat_#t~mem5#1_135| Int) (|ULTIMATE.start_cstrncat_#t~mem5#1| Int) (|ULTIMATE.start_cstrncat_~s~0#1.offset| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| (store (store (select |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset| |ULTIMATE.start_cstrncat_#t~mem5#1|) |v_ULTIMATE.start_cstrncat_~s~0#1.offset_332| |v_ULTIMATE.start_cstrncat_#t~mem5#1_135|)) |c_ULTIMATE.start_cstrncat_~s2#1.base|) (+ |c_ULTIMATE.start_cstrncat_~s2#1.offset| 1)) 0)) is different from false [2021-11-20 23:26:51,055 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_cstrncat_~s~0#1.offset_332| Int) (|v_ULTIMATE.start_cstrncat_#t~mem5#1_135| Int) (|ULTIMATE.start_cstrncat_#t~mem5#1| Int) (|ULTIMATE.start_cstrncat_~s~0#1.offset| Int) (|v_ULTIMATE.start_cstrncat_~s~0#1.offset_334| Int) (|v_ULTIMATE.start_cstrncat_#t~mem5#1_138| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| (store (store (store (select |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset| |ULTIMATE.start_cstrncat_#t~mem5#1|) |v_ULTIMATE.start_cstrncat_~s~0#1.offset_334| |v_ULTIMATE.start_cstrncat_#t~mem5#1_138|) |v_ULTIMATE.start_cstrncat_~s~0#1.offset_332| |v_ULTIMATE.start_cstrncat_#t~mem5#1_135|)) |c_ULTIMATE.start_cstrncat_~s2#1.base|) (+ |c_ULTIMATE.start_cstrncat_~s2#1.offset| 2)) 0)) is different from false [2021-11-20 23:26:51,793 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_cstrncat_~s~0#1.offset_332| Int) (|v_ULTIMATE.start_cstrncat_#t~mem5#1_135| Int) (|ULTIMATE.start_cstrncat_#t~mem5#1| Int) (|ULTIMATE.start_cstrncat_~s~0#1.offset| Int) (|v_ULTIMATE.start_cstrncat_~s~0#1.offset_334| Int) (|v_ULTIMATE.start_cstrncat_#t~mem5#1_138| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| (store (store (store (select |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset| |ULTIMATE.start_cstrncat_#t~mem5#1|) |v_ULTIMATE.start_cstrncat_~s~0#1.offset_334| |v_ULTIMATE.start_cstrncat_#t~mem5#1_138|) |v_ULTIMATE.start_cstrncat_~s~0#1.offset_332| |v_ULTIMATE.start_cstrncat_#t~mem5#1_135|)) |c_ULTIMATE.start_cstrncat_~s2#1.base|) (+ |c_ULTIMATE.start_cstrncat_~s2#1.offset| 3)) 0)) is different from false [2021-11-20 23:26:51,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49386 treesize of output 48618 [2021-11-20 23:27:01,822 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-11-20 23:27:01,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [562419716] [2021-11-20 23:27:01,823 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-20 23:27:01,824 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:27:01,824 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:27:01,824 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:27:01,824 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:27:01,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:27:01,975 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:27:01,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:27:02,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:27:02,582 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:27:02,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:27:03,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:27:03,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:27:04,584 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:27:04,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 46 [2021-11-20 23:27:04,876 INFO L354 Elim1Store]: treesize reduction 44, result has 53.2 percent of original size [2021-11-20 23:27:04,877 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 151 treesize of output 160 [2021-11-20 23:27:05,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:27:06,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:27:06,439 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:27:06,522 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:27:06,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:27:08,992 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:27:08,995 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:27:09,042 INFO L354 Elim1Store]: treesize reduction 153, result has 23.9 percent of original size [2021-11-20 23:27:09,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 49 treesize of output 67 [2021-11-20 23:27:10,688 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:27:10,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:27:12,427 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:27:12,427 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:27:13,325 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:27:16,820 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:27:16,820 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:27:16,820 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2021-11-20 23:27:16,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173956916] [2021-11-20 23:27:16,820 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-20 23:27:16,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-20 23:27:16,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:27:16,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-20 23:27:16,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=2676, Unknown=32, NotChecked=428, Total=3306 [2021-11-20 23:27:16,823 INFO L87 Difference]: Start difference. First operand 592 states and 682 transitions. Second operand has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 23 states have internal predecessors, (43), 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) [2021-11-20 23:27:18,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:27:18,326 INFO L93 Difference]: Finished difference Result 635 states and 722 transitions. [2021-11-20 23:27:18,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-20 23:27:18,327 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 23 states have internal predecessors, (43), 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 43 [2021-11-20 23:27:18,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:27:18,329 INFO L225 Difference]: With dead ends: 635 [2021-11-20 23:27:18,330 INFO L226 Difference]: Without dead ends: 594 [2021-11-20 23:27:18,330 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 76 SyntacticMatches, 5 SemanticMatches, 71 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 985 ImplicationChecksByTransitivity, 29.4s TimeCoverageRelationStatistics Valid=370, Invalid=4306, Unknown=32, NotChecked=548, Total=5256 [2021-11-20 23:27:18,331 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 85 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 629 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 707 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 629 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:27:18,331 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 180 Invalid, 707 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 629 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:27:18,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 594 states. [2021-11-20 23:27:18,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 594 to 591. [2021-11-20 23:27:18,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 591 states, 587 states have (on average 1.1567291311754684) internal successors, (679), 590 states have internal predecessors, (679), 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) [2021-11-20 23:27:18,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 591 states to 591 states and 679 transitions. [2021-11-20 23:27:18,341 INFO L78 Accepts]: Start accepts. Automaton has 591 states and 679 transitions. Word has length 43 [2021-11-20 23:27:18,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:27:18,341 INFO L470 AbstractCegarLoop]: Abstraction has 591 states and 679 transitions. [2021-11-20 23:27:18,341 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 23 states have internal predecessors, (43), 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) [2021-11-20 23:27:18,341 INFO L276 IsEmpty]: Start isEmpty. Operand 591 states and 679 transitions. [2021-11-20 23:27:18,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-20 23:27:18,343 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:27:18,343 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:27:18,380 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2021-11-20 23:27:18,561 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:27:18,562 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:27:18,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:27:18,562 INFO L85 PathProgramCache]: Analyzing trace with hash 1249891520, now seen corresponding path program 3 times [2021-11-20 23:27:18,562 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:27:18,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824141746] [2021-11-20 23:27:18,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:27:18,563 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:27:18,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:27:19,050 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-20 23:27:19,050 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:27:19,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824141746] [2021-11-20 23:27:19,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [824141746] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:27:19,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1085382849] [2021-11-20 23:27:19,051 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:27:19,051 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:27:19,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:27:19,052 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:27:19,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-20 23:27:19,119 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:27:19,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:27:19,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 83 conjunts are in the unsatisfiable core [2021-11-20 23:27:19,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:27:19,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:27:19,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 16 [2021-11-20 23:27:20,741 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-20 23:27:20,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:27:22,327 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-20 23:27:22,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1085382849] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:27:22,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1242746611] [2021-11-20 23:27:22,328 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-20 23:27:22,328 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:27:22,329 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:27:22,329 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:27:22,329 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:27:22,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:27:22,405 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:27:22,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:27:22,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:27:22,895 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:27:22,896 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:27:23,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:27:23,885 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:27:24,780 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:27:24,780 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 49 [2021-11-20 23:27:25,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:27:25,237 INFO L354 Elim1Store]: treesize reduction 46, result has 32.4 percent of original size [2021-11-20 23:27:25,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 155 treesize of output 141 [2021-11-20 23:27:26,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:27:26,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:27:26,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:27:27,038 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:27:27,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:27:31,603 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-20 23:27:31,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-20 23:27:33,017 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:27:33,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:27:34,978 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:27:34,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:27:36,378 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:27:40,119 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:27:40,119 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:27:40,119 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 22, 22] total 59 [2021-11-20 23:27:40,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028323571] [2021-11-20 23:27:40,119 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:27:40,120 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-20 23:27:40,120 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:27:40,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-20 23:27:40,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=5193, Unknown=0, NotChecked=0, Total=5550 [2021-11-20 23:27:40,120 INFO L87 Difference]: Start difference. First operand 591 states and 679 transitions. Second operand has 60 states, 59 states have (on average 1.9491525423728813) internal successors, (115), 60 states have internal predecessors, (115), 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) [2021-11-20 23:27:45,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:27:45,115 INFO L93 Difference]: Finished difference Result 695 states and 783 transitions. [2021-11-20 23:27:45,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-11-20 23:27:45,115 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 1.9491525423728813) internal successors, (115), 60 states have internal predecessors, (115), 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 43 [2021-11-20 23:27:45,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:27:45,119 INFO L225 Difference]: With dead ends: 695 [2021-11-20 23:27:45,119 INFO L226 Difference]: Without dead ends: 676 [2021-11-20 23:27:45,121 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3328 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=1569, Invalid=13683, Unknown=0, NotChecked=0, Total=15252 [2021-11-20 23:27:45,121 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 262 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 1777 mSolverCounterSat, 150 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 1951 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 150 IncrementalHoareTripleChecker+Valid, 1777 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 24 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:27:45,121 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [262 Valid, 185 Invalid, 1951 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [150 Valid, 1777 Invalid, 0 Unknown, 24 Unchecked, 0.9s Time] [2021-11-20 23:27:45,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 676 states. [2021-11-20 23:27:45,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 676 to 591. [2021-11-20 23:27:45,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 591 states, 587 states have (on average 1.1550255536626917) internal successors, (678), 590 states have internal predecessors, (678), 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) [2021-11-20 23:27:45,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 591 states to 591 states and 678 transitions. [2021-11-20 23:27:45,131 INFO L78 Accepts]: Start accepts. Automaton has 591 states and 678 transitions. Word has length 43 [2021-11-20 23:27:45,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:27:45,131 INFO L470 AbstractCegarLoop]: Abstraction has 591 states and 678 transitions. [2021-11-20 23:27:45,131 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 59 states have (on average 1.9491525423728813) internal successors, (115), 60 states have internal predecessors, (115), 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) [2021-11-20 23:27:45,132 INFO L276 IsEmpty]: Start isEmpty. Operand 591 states and 678 transitions. [2021-11-20 23:27:45,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-20 23:27:45,133 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:27:45,133 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:27:45,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-20 23:27:45,354 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-20 23:27:45,354 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:27:45,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:27:45,354 INFO L85 PathProgramCache]: Analyzing trace with hash 1530462791, now seen corresponding path program 13 times [2021-11-20 23:27:45,354 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:27:45,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224749199] [2021-11-20 23:27:45,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:27:45,355 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:27:45,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:27:45,809 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 49 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:45,809 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:27:45,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224749199] [2021-11-20 23:27:45,809 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [224749199] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:27:45,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1394343801] [2021-11-20 23:27:45,809 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:27:45,809 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:27:45,810 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:27:45,810 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:27:45,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-20 23:27:45,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:27:45,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-20 23:27:45,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:27:45,893 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:27:45,893 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-20 23:27:45,895 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:27:46,626 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 64 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:46,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:27:47,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 28 [2021-11-20 23:27:47,532 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 81 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:47,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1394343801] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:27:47,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1700696154] [2021-11-20 23:27:47,533 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:27:47,534 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:27:47,534 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:27:47,534 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:27:47,534 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:27:47,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:27:47,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:27:47,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:27:47,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:27:48,000 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:27:48,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:27:48,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:27:48,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:27:49,636 INFO L354 Elim1Store]: treesize reduction 32, result has 33.3 percent of original size [2021-11-20 23:27:49,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 206 [2021-11-20 23:27:50,316 INFO L354 Elim1Store]: treesize reduction 82, result has 35.9 percent of original size [2021-11-20 23:27:50,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 207 treesize of output 224 [2021-11-20 23:27:53,563 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:27:55,342 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:27:55,342 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:27:55,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 66 [2021-11-20 23:27:55,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106160350] [2021-11-20 23:27:55,343 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:27:55,343 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-20 23:27:55,343 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:27:55,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-20 23:27:55,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=628, Invalid=5224, Unknown=0, NotChecked=0, Total=5852 [2021-11-20 23:27:55,345 INFO L87 Difference]: Start difference. First operand 591 states and 678 transitions. Second operand has 68 states, 67 states have (on average 1.9850746268656716) internal successors, (133), 67 states have internal predecessors, (133), 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) [2021-11-20 23:27:57,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:27:57,617 INFO L93 Difference]: Finished difference Result 1482 states and 1627 transitions. [2021-11-20 23:27:57,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-20 23:27:57,617 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 67 states have (on average 1.9850746268656716) internal successors, (133), 67 states have internal predecessors, (133), 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 45 [2021-11-20 23:27:57,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:27:57,622 INFO L225 Difference]: With dead ends: 1482 [2021-11-20 23:27:57,622 INFO L226 Difference]: Without dead ends: 1450 [2021-11-20 23:27:57,623 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 78 SyntacticMatches, 3 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2964 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=1622, Invalid=8478, Unknown=0, NotChecked=0, Total=10100 [2021-11-20 23:27:57,623 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 752 mSDsluCounter, 1513 mSDsCounter, 0 mSdLazyCounter, 3364 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 752 SdHoareTripleChecker+Valid, 1455 SdHoareTripleChecker+Invalid, 3498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 3364 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:27:57,623 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [752 Valid, 1455 Invalid, 3498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 3364 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-20 23:27:57,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1450 states. [2021-11-20 23:27:57,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1450 to 691. [2021-11-20 23:27:57,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 691 states, 687 states have (on average 1.1382823871906842) internal successors, (782), 690 states have internal predecessors, (782), 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) [2021-11-20 23:27:57,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 691 states to 691 states and 782 transitions. [2021-11-20 23:27:57,638 INFO L78 Accepts]: Start accepts. Automaton has 691 states and 782 transitions. Word has length 45 [2021-11-20 23:27:57,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:27:57,638 INFO L470 AbstractCegarLoop]: Abstraction has 691 states and 782 transitions. [2021-11-20 23:27:57,638 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 67 states have (on average 1.9850746268656716) internal successors, (133), 67 states have internal predecessors, (133), 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) [2021-11-20 23:27:57,639 INFO L276 IsEmpty]: Start isEmpty. Operand 691 states and 782 transitions. [2021-11-20 23:27:57,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-20 23:27:57,640 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:27:57,640 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:27:57,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-20 23:27:57,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-20 23:27:57,866 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:27:57,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:27:57,866 INFO L85 PathProgramCache]: Analyzing trace with hash 2082328352, now seen corresponding path program 9 times [2021-11-20 23:27:57,866 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:27:57,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574518653] [2021-11-20 23:27:57,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:27:57,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:27:57,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:27:58,419 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 12 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:58,419 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:27:58,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574518653] [2021-11-20 23:27:58,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1574518653] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:27:58,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2073919584] [2021-11-20 23:27:58,419 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:27:58,419 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:27:58,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:27:58,420 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:27:58,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-20 23:27:58,479 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:27:58,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:27:58,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-20 23:27:58,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:27:58,495 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:27:58,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-20 23:27:58,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:27:58,787 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:27:58,926 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-20 23:27:59,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-20 23:27:59,087 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-20 23:27:59,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 26 [2021-11-20 23:27:59,170 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-11-20 23:27:59,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 25 [2021-11-20 23:27:59,180 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 23 proven. 28 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-20 23:27:59,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:28:22,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20472 treesize of output 20216 [2021-11-20 23:28:23,693 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-11-20 23:28:23,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1505584071] [2021-11-20 23:28:23,704 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-20 23:28:23,704 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:28:23,704 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:28:23,704 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:28:23,704 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:28:23,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:28:23,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:28:23,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:28:24,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:28:24,181 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:28:24,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:28:24,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:28:25,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:28:26,061 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:28:26,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 49 [2021-11-20 23:28:26,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:28:26,433 INFO L354 Elim1Store]: treesize reduction 46, result has 32.4 percent of original size [2021-11-20 23:28:26,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 155 treesize of output 141 [2021-11-20 23:28:27,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:28:27,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:28:27,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:28:27,656 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:28:27,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:28:29,528 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:28:29,532 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:28:29,578 INFO L354 Elim1Store]: treesize reduction 153, result has 23.9 percent of original size [2021-11-20 23:28:29,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 49 treesize of output 67 [2021-11-20 23:28:31,161 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:28:31,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:28:32,416 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:28:32,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:28:33,378 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:28:36,589 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:28:36,589 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:28:36,589 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2021-11-20 23:28:36,589 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526577127] [2021-11-20 23:28:36,589 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-20 23:28:36,589 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-20 23:28:36,589 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:28:36,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-20 23:28:36,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=3420, Unknown=14, NotChecked=0, Total=3660 [2021-11-20 23:28:36,590 INFO L87 Difference]: Start difference. First operand 691 states and 782 transitions. Second operand has 24 states, 24 states have (on average 1.875) internal successors, (45), 24 states have internal predecessors, (45), 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) [2021-11-20 23:28:38,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:28:38,812 INFO L93 Difference]: Finished difference Result 1127 states and 1253 transitions. [2021-11-20 23:28:38,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-20 23:28:38,813 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.875) internal successors, (45), 24 states have internal predecessors, (45), 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 45 [2021-11-20 23:28:38,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:28:38,816 INFO L225 Difference]: With dead ends: 1127 [2021-11-20 23:28:38,816 INFO L226 Difference]: Without dead ends: 895 [2021-11-20 23:28:38,817 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 79 SyntacticMatches, 4 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2595 ImplicationChecksByTransitivity, 29.0s TimeCoverageRelationStatistics Valid=713, Invalid=8779, Unknown=14, NotChecked=0, Total=9506 [2021-11-20 23:28:38,818 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 166 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 964 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 1042 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 964 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:28:38,818 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [166 Valid, 298 Invalid, 1042 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 964 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:28:38,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 895 states. [2021-11-20 23:28:38,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 895 to 823. [2021-11-20 23:28:38,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 823 states, 819 states have (on average 1.1355311355311355) internal successors, (930), 822 states have internal predecessors, (930), 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) [2021-11-20 23:28:38,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 823 states to 823 states and 930 transitions. [2021-11-20 23:28:38,831 INFO L78 Accepts]: Start accepts. Automaton has 823 states and 930 transitions. Word has length 45 [2021-11-20 23:28:38,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:28:38,831 INFO L470 AbstractCegarLoop]: Abstraction has 823 states and 930 transitions. [2021-11-20 23:28:38,831 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.875) internal successors, (45), 24 states have internal predecessors, (45), 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) [2021-11-20 23:28:38,831 INFO L276 IsEmpty]: Start isEmpty. Operand 823 states and 930 transitions. [2021-11-20 23:28:38,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-20 23:28:38,833 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:28:38,833 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:28:38,864 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-20 23:28:39,049 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-20 23:28:39,049 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:28:39,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:28:39,050 INFO L85 PathProgramCache]: Analyzing trace with hash 1691470169, now seen corresponding path program 4 times [2021-11-20 23:28:39,050 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:28:39,050 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685066201] [2021-11-20 23:28:39,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:28:39,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:28:39,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:28:39,512 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 6 proven. 42 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-20 23:28:39,513 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:28:39,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1685066201] [2021-11-20 23:28:39,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1685066201] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:28:39,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1625240379] [2021-11-20 23:28:39,513 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:28:39,513 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:28:39,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:28:39,514 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:28:39,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-20 23:28:39,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:28:39,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-20 23:28:39,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:28:39,641 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:28:39,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-20 23:28:39,645 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:28:40,730 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 4 proven. 44 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-20 23:28:40,730 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:28:42,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 28 [2021-11-20 23:28:42,201 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 9 proven. 39 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-20 23:28:42,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1625240379] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:28:42,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [718354842] [2021-11-20 23:28:42,202 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-20 23:28:42,203 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:28:42,203 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:28:42,203 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:28:42,203 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:28:42,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:28:42,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:28:42,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:28:42,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:28:42,704 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:28:42,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:28:43,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:28:43,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:28:44,289 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:28:44,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 49 [2021-11-20 23:28:44,706 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:28:44,729 INFO L354 Elim1Store]: treesize reduction 46, result has 32.4 percent of original size [2021-11-20 23:28:44,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 155 treesize of output 141 [2021-11-20 23:28:45,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:28:45,619 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:28:45,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:28:46,202 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:28:46,202 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:28:50,183 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-20 23:28:50,183 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-20 23:28:51,978 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:28:51,978 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:28:53,763 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:28:53,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:28:54,561 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:28:58,426 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:28:58,426 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:28:58,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 20, 21] total 60 [2021-11-20 23:28:58,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651467601] [2021-11-20 23:28:58,427 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:28:58,427 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-20 23:28:58,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:28:58,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-20 23:28:58,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=449, Invalid=5251, Unknown=0, NotChecked=0, Total=5700 [2021-11-20 23:28:58,428 INFO L87 Difference]: Start difference. First operand 823 states and 930 transitions. Second operand has 61 states, 60 states have (on average 2.05) internal successors, (123), 61 states have internal predecessors, (123), 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) [2021-11-20 23:29:04,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:29:04,003 INFO L93 Difference]: Finished difference Result 1022 states and 1136 transitions. [2021-11-20 23:29:04,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-20 23:29:04,004 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 2.05) internal successors, (123), 61 states have internal predecessors, (123), 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 45 [2021-11-20 23:29:04,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:29:04,008 INFO L225 Difference]: With dead ends: 1022 [2021-11-20 23:29:04,008 INFO L226 Difference]: Without dead ends: 986 [2021-11-20 23:29:04,009 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4773 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=2541, Invalid=16091, Unknown=0, NotChecked=0, Total=18632 [2021-11-20 23:29:04,009 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 559 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 1733 mSolverCounterSat, 226 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 559 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 1959 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 226 IncrementalHoareTripleChecker+Valid, 1733 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:29:04,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [559 Valid, 246 Invalid, 1959 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [226 Valid, 1733 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-20 23:29:04,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 986 states. [2021-11-20 23:29:04,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 986 to 753. [2021-11-20 23:29:04,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 753 states, 749 states have (on average 1.1455273698264352) internal successors, (858), 752 states have internal predecessors, (858), 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) [2021-11-20 23:29:04,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 753 states to 753 states and 858 transitions. [2021-11-20 23:29:04,019 INFO L78 Accepts]: Start accepts. Automaton has 753 states and 858 transitions. Word has length 45 [2021-11-20 23:29:04,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:29:04,020 INFO L470 AbstractCegarLoop]: Abstraction has 753 states and 858 transitions. [2021-11-20 23:29:04,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 60 states have (on average 2.05) internal successors, (123), 61 states have internal predecessors, (123), 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) [2021-11-20 23:29:04,020 INFO L276 IsEmpty]: Start isEmpty. Operand 753 states and 858 transitions. [2021-11-20 23:29:04,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-20 23:29:04,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:29:04,022 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:29:04,073 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2021-11-20 23:29:04,222 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:29:04,225 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:29:04,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:29:04,225 INFO L85 PathProgramCache]: Analyzing trace with hash 1203531109, now seen corresponding path program 5 times [2021-11-20 23:29:04,225 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:29:04,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823329828] [2021-11-20 23:29:04,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:29:04,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:29:04,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:29:04,542 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 16 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:29:04,542 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:29:04,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823329828] [2021-11-20 23:29:04,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823329828] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:29:04,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [161632638] [2021-11-20 23:29:04,543 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:29:04,543 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:29:04,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:29:04,544 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:29:04,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-20 23:29:04,704 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-20 23:29:04,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:29:04,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-20 23:29:04,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:29:04,734 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:29:04,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-20 23:29:04,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:29:05,450 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 16 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:29:05,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:29:06,397 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 16 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:29:06,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [161632638] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:29:06,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1879886805] [2021-11-20 23:29:06,401 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:29:06,402 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:29:06,402 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:29:06,402 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:29:06,402 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:29:06,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:29:06,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:29:06,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:29:06,710 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:29:06,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:29:06,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 214 treesize of output 206 [2021-11-20 23:29:07,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:29:07,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:29:08,710 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:29:08,710 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 49 [2021-11-20 23:29:09,158 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:29:09,184 INFO L354 Elim1Store]: treesize reduction 46, result has 32.4 percent of original size [2021-11-20 23:29:09,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 155 treesize of output 141 [2021-11-20 23:29:09,909 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:29:10,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:29:10,294 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:29:10,527 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:29:10,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:29:14,471 INFO L354 Elim1Store]: treesize reduction 24, result has 45.5 percent of original size [2021-11-20 23:29:14,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-11-20 23:29:16,059 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:29:16,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:29:17,999 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:29:17,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:29:18,930 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:29:21,614 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:29:21,614 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:29:21,614 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 52 [2021-11-20 23:29:21,615 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932325400] [2021-11-20 23:29:21,615 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:29:21,615 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-20 23:29:21,615 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:29:21,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-20 23:29:21,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=4052, Unknown=0, NotChecked=0, Total=4422 [2021-11-20 23:29:21,616 INFO L87 Difference]: Start difference. First operand 753 states and 858 transitions. Second operand has 53 states, 52 states have (on average 2.5) internal successors, (130), 53 states have internal predecessors, (130), 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) [2021-11-20 23:29:28,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:29:28,625 INFO L93 Difference]: Finished difference Result 1126 states and 1250 transitions. [2021-11-20 23:29:28,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2021-11-20 23:29:28,626 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 2.5) internal successors, (130), 53 states have internal predecessors, (130), 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 46 [2021-11-20 23:29:28,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:29:28,629 INFO L225 Difference]: With dead ends: 1126 [2021-11-20 23:29:28,629 INFO L226 Difference]: Without dead ends: 1096 [2021-11-20 23:29:28,631 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9450 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=5342, Invalid=28698, Unknown=0, NotChecked=0, Total=34040 [2021-11-20 23:29:28,631 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 684 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 2436 mSolverCounterSat, 251 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 684 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 2687 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 251 IncrementalHoareTripleChecker+Valid, 2436 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:29:28,632 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [684 Valid, 240 Invalid, 2687 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [251 Valid, 2436 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-20 23:29:28,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1096 states. [2021-11-20 23:29:28,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1096 to 721. [2021-11-20 23:29:28,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 721 states, 717 states have (on average 1.1450488145048814) internal successors, (821), 720 states have internal predecessors, (821), 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) [2021-11-20 23:29:28,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 721 states to 721 states and 821 transitions. [2021-11-20 23:29:28,641 INFO L78 Accepts]: Start accepts. Automaton has 721 states and 821 transitions. Word has length 46 [2021-11-20 23:29:28,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:29:28,641 INFO L470 AbstractCegarLoop]: Abstraction has 721 states and 821 transitions. [2021-11-20 23:29:28,641 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 52 states have (on average 2.5) internal successors, (130), 53 states have internal predecessors, (130), 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) [2021-11-20 23:29:28,641 INFO L276 IsEmpty]: Start isEmpty. Operand 721 states and 821 transitions. [2021-11-20 23:29:28,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-20 23:29:28,642 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:29:28,642 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:29:28,688 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-20 23:29:28,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:29:28,857 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:29:28,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:29:28,858 INFO L85 PathProgramCache]: Analyzing trace with hash 1895927520, now seen corresponding path program 14 times [2021-11-20 23:29:28,858 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:29:28,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [873818622] [2021-11-20 23:29:28,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:29:28,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:29:28,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:29:29,437 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 30 proven. 171 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:29:29,437 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:29:29,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [873818622] [2021-11-20 23:29:29,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [873818622] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:29:29,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [691890684] [2021-11-20 23:29:29,438 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:29:29,438 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:29:29,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:29:29,442 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:29:29,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-20 23:29:29,701 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-20 23:29:29,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:29:29,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 80 conjunts are in the unsatisfiable core [2021-11-20 23:29:29,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:29:29,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:29:30,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-11-20 23:29:30,223 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:29:30,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 41 [2021-11-20 23:29:31,250 INFO L354 Elim1Store]: treesize reduction 48, result has 5.9 percent of original size [2021-11-20 23:29:31,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 45 treesize of output 27 [2021-11-20 23:29:31,257 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 30 proven. 171 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:29:31,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:29:32,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 56 [2021-11-20 23:29:32,695 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 30 proven. 171 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:29:32,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [691890684] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:29:32,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [917658480] [2021-11-20 23:29:32,696 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:29:32,696 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:29:32,696 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:29:32,696 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:29:32,696 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:29:32,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:29:32,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:29:32,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:29:32,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:29:33,188 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:29:33,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:29:33,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:29:34,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:29:34,859 INFO L354 Elim1Store]: treesize reduction 32, result has 33.3 percent of original size [2021-11-20 23:29:34,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 206 [2021-11-20 23:29:35,544 INFO L354 Elim1Store]: treesize reduction 82, result has 35.9 percent of original size [2021-11-20 23:29:35,544 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 207 treesize of output 224 [2021-11-20 23:29:38,239 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:29:40,270 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:29:40,271 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:29:40,271 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 63 [2021-11-20 23:29:40,271 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191465654] [2021-11-20 23:29:40,271 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:29:40,271 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-20 23:29:40,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:29:40,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-20 23:29:40,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=4899, Unknown=1, NotChecked=0, Total=5112 [2021-11-20 23:29:40,272 INFO L87 Difference]: Start difference. First operand 721 states and 821 transitions. Second operand has 63 states, 63 states have (on average 1.8095238095238095) internal successors, (114), 63 states have internal predecessors, (114), 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) [2021-11-20 23:29:41,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:29:41,613 INFO L93 Difference]: Finished difference Result 1608 states and 1768 transitions. [2021-11-20 23:29:41,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-20 23:29:41,614 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.8095238095238095) internal successors, (114), 63 states have internal predecessors, (114), 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 [2021-11-20 23:29:41,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:29:41,619 INFO L225 Difference]: With dead ends: 1608 [2021-11-20 23:29:41,619 INFO L226 Difference]: Without dead ends: 1564 [2021-11-20 23:29:41,619 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1291 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=312, Invalid=6827, Unknown=1, NotChecked=0, Total=7140 [2021-11-20 23:29:41,619 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 208 mSDsluCounter, 2845 mSDsCounter, 0 mSdLazyCounter, 1793 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 2639 SdHoareTripleChecker+Invalid, 2338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 1793 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 530 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:29:41,619 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [208 Valid, 2639 Invalid, 2338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 1793 Invalid, 0 Unknown, 530 Unchecked, 0.7s Time] [2021-11-20 23:29:41,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1564 states. [2021-11-20 23:29:41,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1564 to 762. [2021-11-20 23:29:41,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 762 states, 758 states have (on average 1.1530343007915567) internal successors, (874), 761 states have internal predecessors, (874), 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) [2021-11-20 23:29:41,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 762 states to 762 states and 874 transitions. [2021-11-20 23:29:41,630 INFO L78 Accepts]: Start accepts. Automaton has 762 states and 874 transitions. Word has length 47 [2021-11-20 23:29:41,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:29:41,630 INFO L470 AbstractCegarLoop]: Abstraction has 762 states and 874 transitions. [2021-11-20 23:29:41,630 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.8095238095238095) internal successors, (114), 63 states have internal predecessors, (114), 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) [2021-11-20 23:29:41,630 INFO L276 IsEmpty]: Start isEmpty. Operand 762 states and 874 transitions. [2021-11-20 23:29:41,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-20 23:29:41,631 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:29:41,631 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:29:41,651 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-20 23:29:41,831 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:29:41,832 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:29:41,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:29:41,832 INFO L85 PathProgramCache]: Analyzing trace with hash -1338966320, now seen corresponding path program 10 times [2021-11-20 23:29:41,832 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:29:41,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926095719] [2021-11-20 23:29:41,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:29:41,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:29:41,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:29:42,046 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 4 proven. 54 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-20 23:29:42,047 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:29:42,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926095719] [2021-11-20 23:29:42,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [926095719] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:29:42,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1734148951] [2021-11-20 23:29:42,047 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:29:42,047 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:29:42,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:29:42,048 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:29:42,072 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-20 23:29:42,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:29:42,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-20 23:29:42,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:29:42,376 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 9 proven. 49 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-20 23:29:42,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:29:42,621 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-20 23:29:42,663 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 9 proven. 49 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-20 23:29:42,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1734148951] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:29:42,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [958384352] [2021-11-20 23:29:42,665 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-20 23:29:42,665 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:29:42,665 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:29:42,665 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:29:42,665 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:29:42,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:29:42,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:29:42,752 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:29:42,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:29:43,102 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:29:43,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:29:43,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:29:44,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:29:44,807 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:29:44,807 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 49 [2021-11-20 23:29:45,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:29:45,109 INFO L354 Elim1Store]: treesize reduction 46, result has 32.4 percent of original size [2021-11-20 23:29:45,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 155 treesize of output 141 [2021-11-20 23:29:45,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:29:45,891 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:29:46,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:29:46,423 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:29:46,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:29:48,257 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:29:48,260 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:29:48,301 INFO L354 Elim1Store]: treesize reduction 153, result has 23.9 percent of original size [2021-11-20 23:29:48,301 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 49 treesize of output 67 [2021-11-20 23:29:49,459 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:29:49,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:29:50,984 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-20 23:29:50,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-20 23:29:52,141 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:29:54,981 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:29:54,981 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:29:54,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 28 [2021-11-20 23:29:54,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204773034] [2021-11-20 23:29:54,981 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:29:54,982 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-20 23:29:54,982 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:29:54,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-20 23:29:54,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1712, Unknown=0, NotChecked=0, Total=1892 [2021-11-20 23:29:54,982 INFO L87 Difference]: Start difference. First operand 762 states and 874 transitions. Second operand has 29 states, 28 states have (on average 3.107142857142857) internal successors, (87), 29 states have internal predecessors, (87), 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) [2021-11-20 23:29:55,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:29:55,784 INFO L93 Difference]: Finished difference Result 876 states and 977 transitions. [2021-11-20 23:29:55,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-20 23:29:55,785 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 3.107142857142857) internal successors, (87), 29 states have internal predecessors, (87), 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 [2021-11-20 23:29:55,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:29:55,788 INFO L225 Difference]: With dead ends: 876 [2021-11-20 23:29:55,788 INFO L226 Difference]: Without dead ends: 876 [2021-11-20 23:29:55,788 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 109 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 957 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=502, Invalid=3404, Unknown=0, NotChecked=0, Total=3906 [2021-11-20 23:29:55,788 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 301 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 704 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 301 SdHoareTripleChecker+Valid, 281 SdHoareTripleChecker+Invalid, 738 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 704 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:29:55,788 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [301 Valid, 281 Invalid, 738 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 704 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:29:55,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 876 states. [2021-11-20 23:29:55,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 876 to 799. [2021-11-20 23:29:55,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 799 states, 795 states have (on average 1.1471698113207547) internal successors, (912), 798 states have internal predecessors, (912), 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) [2021-11-20 23:29:55,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 799 states to 799 states and 912 transitions. [2021-11-20 23:29:55,796 INFO L78 Accepts]: Start accepts. Automaton has 799 states and 912 transitions. Word has length 47 [2021-11-20 23:29:55,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:29:55,796 INFO L470 AbstractCegarLoop]: Abstraction has 799 states and 912 transitions. [2021-11-20 23:29:55,797 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 3.107142857142857) internal successors, (87), 29 states have internal predecessors, (87), 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) [2021-11-20 23:29:55,797 INFO L276 IsEmpty]: Start isEmpty. Operand 799 states and 912 transitions. [2021-11-20 23:29:55,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-20 23:29:55,798 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:29:55,798 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:29:55,822 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-20 23:29:56,008 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-11-20 23:29:56,008 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:29:56,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:29:56,008 INFO L85 PathProgramCache]: Analyzing trace with hash -1828603653, now seen corresponding path program 15 times [2021-11-20 23:29:56,009 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:29:56,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709562833] [2021-11-20 23:29:56,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:29:56,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:29:56,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:29:56,555 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 64 proven. 157 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:29:56,555 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:29:56,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [709562833] [2021-11-20 23:29:56,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [709562833] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:29:56,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1380372844] [2021-11-20 23:29:56,555 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:29:56,555 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:29:56,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:29:56,556 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:29:56,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6100583e-b2fd-4f3e-9f23-a57ae808041d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-20 23:29:56,647 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:29:56,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:29:56,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 109 conjunts are in the unsatisfiable core [2021-11-20 23:29:56,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:29:56,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:29:57,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-11-20 23:29:57,477 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-11-20 23:29:57,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 56 treesize of output 55 [2021-11-20 23:30:02,608 INFO L354 Elim1Store]: treesize reduction 928, result has 9.1 percent of original size [2021-11-20 23:30:02,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 13 select indices, 13 select index equivalence classes, 0 disjoint index pairs (out of 78 index pairs), introduced 13 new quantified variables, introduced 78 case distinctions, treesize of input 164 treesize of output 175 [2021-11-20 23:30:03,056 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 11 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:30:03,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:30:05,919 INFO L354 Elim1Store]: treesize reduction 640, result has 0.2 percent of original size [2021-11-20 23:30:05,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 0 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 55 case distinctions, treesize of input 668 treesize of output 604