./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/openssl/s3_srvr.blast.15.i.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/openssl/s3_srvr.blast.15.i.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 4d1a05335dcd475270df3d2b7e447bf62801b1b41377a4a2d9fc94b2523fc1ec --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:05:33,830 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:05:33,833 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:05:33,895 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:05:33,896 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:05:33,900 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:05:33,902 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:05:33,906 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:05:33,909 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:05:33,916 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:05:33,917 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:05:33,919 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:05:33,919 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:05:33,922 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:05:33,924 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:05:33,933 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:05:33,935 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:05:33,936 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:05:33,939 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:05:33,947 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:05:33,949 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:05:33,951 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:05:33,955 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:05:33,956 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:05:33,966 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:05:33,967 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:05:33,967 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:05:33,969 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:05:33,970 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:05:33,972 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:05:33,972 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:05:33,973 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:05:33,975 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:05:33,976 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:05:33,978 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:05:33,978 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:05:33,979 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:05:33,979 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:05:33,979 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:05:33,980 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:05:33,981 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:05:33,982 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:05:34,025 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:05:34,025 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:05:34,026 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:05:34,026 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:05:34,032 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:05:34,033 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:05:34,033 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:05:34,033 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:05:34,033 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:05:34,033 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:05:34,034 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:05:34,034 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:05:34,035 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:05:34,035 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:05:34,035 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:05:34,035 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:05:34,035 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:05:34,035 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:05:34,036 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:05:34,036 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:05:34,036 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:05:34,037 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:05:34,037 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:05:34,037 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:05:34,037 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:05:34,037 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:05:34,039 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:05:34,039 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:05:34,039 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:05:34,039 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:05:34,040 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:05:34,040 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:05:34,040 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:05:34,040 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:05:34,040 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:05:34,041 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:05:34,041 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:05:34,041 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:05:34,041 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:05:34,041 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:05:34,042 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:05:34,042 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_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4d1a05335dcd475270df3d2b7e447bf62801b1b41377a4a2d9fc94b2523fc1ec [2021-11-25 19:05:34,347 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:05:34,373 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:05:34,377 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:05:34,378 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:05:34,379 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:05:34,381 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/openssl/s3_srvr.blast.15.i.cil-1.c [2021-11-25 19:05:34,471 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/data/411d3cb9b/955cbd4c10344dc68133e905ed3a0343/FLAG35578f475 [2021-11-25 19:05:35,185 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:05:35,187 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/sv-benchmarks/c/openssl/s3_srvr.blast.15.i.cil-1.c [2021-11-25 19:05:35,219 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/data/411d3cb9b/955cbd4c10344dc68133e905ed3a0343/FLAG35578f475 [2021-11-25 19:05:35,377 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/data/411d3cb9b/955cbd4c10344dc68133e905ed3a0343 [2021-11-25 19:05:35,379 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:05:35,380 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:05:35,381 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:05:35,382 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:05:35,385 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:05:35,386 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:05:35" (1/1) ... [2021-11-25 19:05:35,387 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f37d482 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:05:35, skipping insertion in model container [2021-11-25 19:05:35,387 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:05:35" (1/1) ... [2021-11-25 19:05:35,394 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:05:35,470 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:05:35,842 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/sv-benchmarks/c/openssl/s3_srvr.blast.15.i.cil-1.c[75550,75563] [2021-11-25 19:05:35,851 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:05:35,868 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:05:36,033 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/sv-benchmarks/c/openssl/s3_srvr.blast.15.i.cil-1.c[75550,75563] [2021-11-25 19:05:36,037 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:05:36,054 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:05:36,055 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:05:36 WrapperNode [2021-11-25 19:05:36,055 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:05:36,056 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:05:36,056 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:05:36,056 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:05:36,063 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:05:36" (1/1) ... [2021-11-25 19:05:36,100 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:05:36" (1/1) ... [2021-11-25 19:05:36,172 INFO L137 Inliner]: procedures = 31, calls = 223, calls flagged for inlining = 7, calls inlined = 3, statements flattened = 799 [2021-11-25 19:05:36,174 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:05:36,175 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:05:36,176 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:05:36,176 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:05:36,184 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:05:36" (1/1) ... [2021-11-25 19:05:36,185 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:05:36" (1/1) ... [2021-11-25 19:05:36,212 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:05:36" (1/1) ... [2021-11-25 19:05:36,212 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:05:36" (1/1) ... [2021-11-25 19:05:36,311 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:05:36" (1/1) ... [2021-11-25 19:05:36,319 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:05:36" (1/1) ... [2021-11-25 19:05:36,322 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:05:36" (1/1) ... [2021-11-25 19:05:36,327 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:05:36,328 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:05:36,328 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:05:36,328 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:05:36,329 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:05:36" (1/1) ... [2021-11-25 19:05:36,341 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:05:36,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:05:36,363 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:05:36,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:05:36,411 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:05:36,411 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-25 19:05:36,411 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 19:05:36,411 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 19:05:36,411 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-25 19:05:36,412 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:05:36,412 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-25 19:05:36,412 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:05:36,412 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:05:36,558 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:05:36,560 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:05:36,592 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-25 19:05:37,931 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##90: assume false; [2021-11-25 19:05:37,931 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##91: assume !false; [2021-11-25 19:05:37,931 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:05:38,324 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:05:38,325 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 19:05:38,327 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:05:38 BoogieIcfgContainer [2021-11-25 19:05:38,327 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:05:38,329 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:05:38,329 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:05:38,332 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:05:38,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:05:35" (1/3) ... [2021-11-25 19:05:38,334 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32f57195 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:05:38, skipping insertion in model container [2021-11-25 19:05:38,334 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:05:36" (2/3) ... [2021-11-25 19:05:38,334 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32f57195 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:05:38, skipping insertion in model container [2021-11-25 19:05:38,334 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:05:38" (3/3) ... [2021-11-25 19:05:38,336 INFO L111 eAbstractionObserver]: Analyzing ICFG s3_srvr.blast.15.i.cil-1.c [2021-11-25 19:05:38,341 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:05:38,341 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:05:38,404 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:05:38,415 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 19:05:38,415 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:05:38,443 INFO L276 IsEmpty]: Start isEmpty. Operand has 110 states, 108 states have (on average 1.7592592592592593) internal successors, (190), 109 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:38,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-25 19:05:38,454 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:38,455 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:05:38,456 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:38,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:38,461 INFO L85 PathProgramCache]: Analyzing trace with hash 1399932064, now seen corresponding path program 1 times [2021-11-25 19:05:38,470 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:38,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109226754] [2021-11-25 19:05:38,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:38,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:38,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:39,168 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:05:39,169 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:39,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109226754] [2021-11-25 19:05:39,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [109226754] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:39,170 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:05:39,170 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:05:39,172 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57478166] [2021-11-25 19:05:39,173 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:39,177 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:05:39,177 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:39,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:05:39,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:05:39,207 INFO L87 Difference]: Start difference. First operand has 110 states, 108 states have (on average 1.7592592592592593) internal successors, (190), 109 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 9.25) internal successors, (37), 3 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:41,232 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:05:41,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:41,697 INFO L93 Difference]: Finished difference Result 243 states and 420 transitions. [2021-11-25 19:05:41,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:05:41,705 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.25) internal successors, (37), 3 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-25 19:05:41,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:41,719 INFO L225 Difference]: With dead ends: 243 [2021-11-25 19:05:41,721 INFO L226 Difference]: Without dead ends: 129 [2021-11-25 19:05:41,724 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 [2021-11-25 19:05:41,731 INFO L933 BasicCegarLoop]: 153 mSDtfsCounter, 20 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 405 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:41,737 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 405 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 154 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:05:41,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-25 19:05:41,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 117. [2021-11-25 19:05:41,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.543103448275862) internal successors, (179), 116 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:41,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 179 transitions. [2021-11-25 19:05:41,801 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 179 transitions. Word has length 37 [2021-11-25 19:05:41,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:41,802 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 179 transitions. [2021-11-25 19:05:41,802 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.25) internal successors, (37), 3 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:41,803 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 179 transitions. [2021-11-25 19:05:41,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-25 19:05:41,805 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:41,805 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:05:41,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 19:05:41,806 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:41,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:41,806 INFO L85 PathProgramCache]: Analyzing trace with hash 1515536038, now seen corresponding path program 1 times [2021-11-25 19:05:41,807 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:41,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [854997171] [2021-11-25 19:05:41,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:41,807 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:41,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:42,101 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:05:42,101 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:42,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [854997171] [2021-11-25 19:05:42,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [854997171] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:42,103 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:05:42,104 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:05:42,104 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348929651] [2021-11-25 19:05:42,104 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:42,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:05:42,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:42,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:05:42,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:05:42,108 INFO L87 Difference]: Start difference. First operand 117 states and 179 transitions. Second operand has 4 states, 4 states have (on average 11.75) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:44,127 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:05:44,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:44,674 INFO L93 Difference]: Finished difference Result 324 states and 494 transitions. [2021-11-25 19:05:44,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:05:44,675 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 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 [2021-11-25 19:05:44,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:44,678 INFO L225 Difference]: With dead ends: 324 [2021-11-25 19:05:44,678 INFO L226 Difference]: Without dead ends: 219 [2021-11-25 19:05:44,679 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 [2021-11-25 19:05:44,680 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 123 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 51 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:44,681 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 234 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 224 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 19:05:44,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-11-25 19:05:44,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 126. [2021-11-25 19:05:44,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 125 states have (on average 1.52) internal successors, (190), 125 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:44,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 190 transitions. [2021-11-25 19:05:44,697 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 190 transitions. Word has length 47 [2021-11-25 19:05:44,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:44,697 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 190 transitions. [2021-11-25 19:05:44,698 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:44,698 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 190 transitions. [2021-11-25 19:05:44,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-25 19:05:44,700 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:44,700 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:05:44,701 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 19:05:44,701 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:44,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:44,702 INFO L85 PathProgramCache]: Analyzing trace with hash -390441345, now seen corresponding path program 1 times [2021-11-25 19:05:44,702 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:44,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [331108143] [2021-11-25 19:05:44,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:44,702 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:44,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:44,878 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:05:44,878 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:44,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [331108143] [2021-11-25 19:05:44,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [331108143] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:44,879 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:05:44,879 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:05:44,879 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130372006] [2021-11-25 19:05:44,879 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:44,879 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:05:44,880 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:44,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:05:44,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:05:44,883 INFO L87 Difference]: Start difference. First operand 126 states and 190 transitions. Second operand has 4 states, 4 states have (on average 12.0) internal successors, (48), 3 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) [2021-11-25 19:05:46,895 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:05:47,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:47,367 INFO L93 Difference]: Finished difference Result 333 states and 504 transitions. [2021-11-25 19:05:47,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:05:47,368 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 3 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) Word has length 48 [2021-11-25 19:05:47,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:47,370 INFO L225 Difference]: With dead ends: 333 [2021-11-25 19:05:47,370 INFO L226 Difference]: Without dead ends: 219 [2021-11-25 19:05:47,371 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 [2021-11-25 19:05:47,373 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 121 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 51 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:47,373 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 233 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 225 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 19:05:47,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-11-25 19:05:47,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 127. [2021-11-25 19:05:47,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 126 states have (on average 1.507936507936508) internal successors, (190), 126 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:47,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 190 transitions. [2021-11-25 19:05:47,391 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 190 transitions. Word has length 48 [2021-11-25 19:05:47,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:47,391 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 190 transitions. [2021-11-25 19:05:47,391 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 3 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) [2021-11-25 19:05:47,392 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 190 transitions. [2021-11-25 19:05:47,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 19:05:47,393 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:47,393 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:05:47,394 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 19:05:47,394 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:47,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:47,394 INFO L85 PathProgramCache]: Analyzing trace with hash 1755693059, now seen corresponding path program 1 times [2021-11-25 19:05:47,394 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:47,395 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683421763] [2021-11-25 19:05:47,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:47,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:47,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:47,624 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:05:47,624 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:47,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683421763] [2021-11-25 19:05:47,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683421763] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:47,631 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:05:47,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:05:47,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686292490] [2021-11-25 19:05:47,631 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:47,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:05:47,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:47,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:05:47,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:05:47,634 INFO L87 Difference]: Start difference. First operand 127 states and 190 transitions. Second operand has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:49,646 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:05:50,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:50,080 INFO L93 Difference]: Finished difference Result 334 states and 503 transitions. [2021-11-25 19:05:50,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:05:50,081 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 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 49 [2021-11-25 19:05:50,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:50,083 INFO L225 Difference]: With dead ends: 334 [2021-11-25 19:05:50,083 INFO L226 Difference]: Without dead ends: 219 [2021-11-25 19:05:50,084 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 [2021-11-25 19:05:50,085 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 119 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 51 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:50,085 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [119 Valid, 233 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 225 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:05:50,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-11-25 19:05:50,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 128. [2021-11-25 19:05:50,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 127 states have (on average 1.4960629921259843) internal successors, (190), 127 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:50,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 190 transitions. [2021-11-25 19:05:50,096 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 190 transitions. Word has length 49 [2021-11-25 19:05:50,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:50,097 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 190 transitions. [2021-11-25 19:05:50,097 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:50,097 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 190 transitions. [2021-11-25 19:05:50,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 19:05:50,099 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:50,099 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:05:50,099 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 19:05:50,100 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:50,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:50,100 INFO L85 PathProgramCache]: Analyzing trace with hash -2040947957, now seen corresponding path program 1 times [2021-11-25 19:05:50,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:50,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1810338003] [2021-11-25 19:05:50,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:50,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:50,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:50,276 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:05:50,276 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:50,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1810338003] [2021-11-25 19:05:50,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1810338003] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:50,277 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:05:50,277 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:05:50,277 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939758708] [2021-11-25 19:05:50,277 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:50,278 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:05:50,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:50,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:05:50,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:05:50,279 INFO L87 Difference]: Start difference. First operand 128 states and 190 transitions. Second operand has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:52,293 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:05:52,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:52,753 INFO L93 Difference]: Finished difference Result 346 states and 516 transitions. [2021-11-25 19:05:52,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:05:52,755 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 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 49 [2021-11-25 19:05:52,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:52,756 INFO L225 Difference]: With dead ends: 346 [2021-11-25 19:05:52,757 INFO L226 Difference]: Without dead ends: 230 [2021-11-25 19:05:52,757 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 [2021-11-25 19:05:52,758 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 115 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 49 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:52,758 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [115 Valid, 233 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 226 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:05:52,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-11-25 19:05:52,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 142. [2021-11-25 19:05:52,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 141 states have (on average 1.475177304964539) internal successors, (208), 141 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:52,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 208 transitions. [2021-11-25 19:05:52,769 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 208 transitions. Word has length 49 [2021-11-25 19:05:52,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:52,770 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 208 transitions. [2021-11-25 19:05:52,770 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:52,770 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 208 transitions. [2021-11-25 19:05:52,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 19:05:52,772 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:52,772 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:05:52,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 19:05:52,772 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:52,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:52,773 INFO L85 PathProgramCache]: Analyzing trace with hash -642883036, now seen corresponding path program 1 times [2021-11-25 19:05:52,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:52,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [259707086] [2021-11-25 19:05:52,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:52,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:52,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:52,920 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:05:52,921 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:52,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [259707086] [2021-11-25 19:05:52,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [259707086] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:52,921 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:05:52,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:05:52,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211923809] [2021-11-25 19:05:52,922 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:52,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:05:52,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:52,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:05:52,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:05:52,923 INFO L87 Difference]: Start difference. First operand 142 states and 208 transitions. Second operand has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:54,934 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:05:55,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:55,242 INFO L93 Difference]: Finished difference Result 284 states and 414 transitions. [2021-11-25 19:05:55,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:05:55,244 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 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 49 [2021-11-25 19:05:55,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:55,245 INFO L225 Difference]: With dead ends: 284 [2021-11-25 19:05:55,245 INFO L226 Difference]: Without dead ends: 154 [2021-11-25 19:05:55,245 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 [2021-11-25 19:05:55,246 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 9 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:55,247 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 337 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 142 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-25 19:05:55,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-11-25 19:05:55,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 142. [2021-11-25 19:05:55,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 141 states have (on average 1.4680851063829787) internal successors, (207), 141 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) [2021-11-25 19:05:55,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 207 transitions. [2021-11-25 19:05:55,256 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 207 transitions. Word has length 49 [2021-11-25 19:05:55,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:55,256 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 207 transitions. [2021-11-25 19:05:55,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:55,256 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 207 transitions. [2021-11-25 19:05:55,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 19:05:55,258 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:55,258 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:05:55,258 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 19:05:55,259 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:55,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:55,259 INFO L85 PathProgramCache]: Analyzing trace with hash 819690311, now seen corresponding path program 1 times [2021-11-25 19:05:55,259 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:55,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1722003271] [2021-11-25 19:05:55,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:55,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:55,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:55,453 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:05:55,453 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:55,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1722003271] [2021-11-25 19:05:55,454 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1722003271] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:55,454 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:05:55,454 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:05:55,455 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304302086] [2021-11-25 19:05:55,455 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:55,455 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:05:55,456 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:55,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:05:55,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:05:55,457 INFO L87 Difference]: Start difference. First operand 142 states and 207 transitions. Second operand has 4 states, 4 states have (on average 12.5) internal successors, (50), 3 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) [2021-11-25 19:05:57,470 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:05:57,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:57,975 INFO L93 Difference]: Finished difference Result 363 states and 538 transitions. [2021-11-25 19:05:57,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:05:57,975 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 3 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) Word has length 50 [2021-11-25 19:05:57,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:57,977 INFO L225 Difference]: With dead ends: 363 [2021-11-25 19:05:57,977 INFO L226 Difference]: Without dead ends: 233 [2021-11-25 19:05:57,978 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 [2021-11-25 19:05:57,979 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 114 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 51 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:57,980 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 233 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 225 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 19:05:57,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-11-25 19:05:57,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 146. [2021-11-25 19:05:57,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.4689655172413794) internal successors, (213), 145 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:05:57,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 213 transitions. [2021-11-25 19:05:57,990 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 213 transitions. Word has length 50 [2021-11-25 19:05:57,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:57,990 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 213 transitions. [2021-11-25 19:05:57,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 3 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) [2021-11-25 19:05:57,991 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 213 transitions. [2021-11-25 19:05:57,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 19:05:57,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:57,993 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:05:57,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 19:05:57,993 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:57,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:57,994 INFO L85 PathProgramCache]: Analyzing trace with hash -1262119462, now seen corresponding path program 1 times [2021-11-25 19:05:57,994 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:05:57,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [621147774] [2021-11-25 19:05:57,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:57,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:05:58,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:58,164 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:05:58,165 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:05:58,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [621147774] [2021-11-25 19:05:58,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [621147774] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:05:58,165 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:05:58,166 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:05:58,166 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138052384] [2021-11-25 19:05:58,166 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:05:58,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:05:58,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:05:58,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:05:58,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:05:58,168 INFO L87 Difference]: Start difference. First operand 146 states and 213 transitions. Second operand has 4 states, 4 states have (on average 12.5) internal successors, (50), 3 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) [2021-11-25 19:06:00,182 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:00,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:00,622 INFO L93 Difference]: Finished difference Result 367 states and 543 transitions. [2021-11-25 19:06:00,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:06:00,623 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 3 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) Word has length 50 [2021-11-25 19:06:00,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:00,624 INFO L225 Difference]: With dead ends: 367 [2021-11-25 19:06:00,624 INFO L226 Difference]: Without dead ends: 233 [2021-11-25 19:06:00,625 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 [2021-11-25 19:06:00,626 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 116 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 51 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:00,626 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 233 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 225 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:06:00,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-11-25 19:06:00,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 146. [2021-11-25 19:06:00,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.4482758620689655) internal successors, (210), 145 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:00,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 210 transitions. [2021-11-25 19:06:00,633 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 210 transitions. Word has length 50 [2021-11-25 19:06:00,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:00,633 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 210 transitions. [2021-11-25 19:06:00,634 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 3 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) [2021-11-25 19:06:00,634 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 210 transitions. [2021-11-25 19:06:00,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-25 19:06:00,635 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:00,635 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:00,635 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 19:06:00,636 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:00,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:00,644 INFO L85 PathProgramCache]: Analyzing trace with hash -1153529410, now seen corresponding path program 1 times [2021-11-25 19:06:00,644 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:00,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [560149873] [2021-11-25 19:06:00,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:00,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:00,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:00,810 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:00,810 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:00,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [560149873] [2021-11-25 19:06:00,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [560149873] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:00,811 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:00,811 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:06:00,811 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645971522] [2021-11-25 19:06:00,811 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:00,812 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:06:00,812 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:00,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:06:00,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:06:00,813 INFO L87 Difference]: Start difference. First operand 146 states and 210 transitions. Second operand has 4 states, 4 states have (on average 12.75) internal successors, (51), 3 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) [2021-11-25 19:06:02,825 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:03,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:03,123 INFO L93 Difference]: Finished difference Result 282 states and 409 transitions. [2021-11-25 19:06:03,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:06:03,125 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 3 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) Word has length 51 [2021-11-25 19:06:03,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:03,126 INFO L225 Difference]: With dead ends: 282 [2021-11-25 19:06:03,126 INFO L226 Difference]: Without dead ends: 148 [2021-11-25 19:06:03,127 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 [2021-11-25 19:06:03,128 INFO L933 BasicCegarLoop]: 137 mSDtfsCounter, 5 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:03,128 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 350 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 129 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-25 19:06:03,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-25 19:06:03,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 146. [2021-11-25 19:06:03,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.4413793103448276) internal successors, (209), 145 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:03,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 209 transitions. [2021-11-25 19:06:03,135 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 209 transitions. Word has length 51 [2021-11-25 19:06:03,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:03,136 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 209 transitions. [2021-11-25 19:06:03,136 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 3 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) [2021-11-25 19:06:03,136 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 209 transitions. [2021-11-25 19:06:03,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-25 19:06:03,137 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:03,137 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:03,137 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 19:06:03,137 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:03,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:03,138 INFO L85 PathProgramCache]: Analyzing trace with hash -1023995155, now seen corresponding path program 1 times [2021-11-25 19:06:03,139 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:03,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996433892] [2021-11-25 19:06:03,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:03,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:03,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:03,297 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:03,297 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:03,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996433892] [2021-11-25 19:06:03,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [996433892] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:03,298 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:03,298 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:06:03,298 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770915125] [2021-11-25 19:06:03,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:03,299 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:06:03,299 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:03,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:06:03,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:06:03,300 INFO L87 Difference]: Start difference. First operand 146 states and 209 transitions. Second operand has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 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) [2021-11-25 19:06:05,311 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:05,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:05,733 INFO L93 Difference]: Finished difference Result 312 states and 449 transitions. [2021-11-25 19:06:05,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:06:05,735 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 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) Word has length 52 [2021-11-25 19:06:05,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:05,736 INFO L225 Difference]: With dead ends: 312 [2021-11-25 19:06:05,736 INFO L226 Difference]: Without dead ends: 178 [2021-11-25 19:06:05,737 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 [2021-11-25 19:06:05,737 INFO L933 BasicCegarLoop]: 136 mSDtfsCounter, 16 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 349 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:05,737 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 349 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 154 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:06:05,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-11-25 19:06:05,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 166. [2021-11-25 19:06:05,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 165 states have (on average 1.4363636363636363) internal successors, (237), 165 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:05,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 237 transitions. [2021-11-25 19:06:05,746 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 237 transitions. Word has length 52 [2021-11-25 19:06:05,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:05,746 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 237 transitions. [2021-11-25 19:06:05,747 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 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) [2021-11-25 19:06:05,747 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 237 transitions. [2021-11-25 19:06:05,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-25 19:06:05,748 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:05,748 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:05,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 19:06:05,749 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:05,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:05,750 INFO L85 PathProgramCache]: Analyzing trace with hash 1448617201, now seen corresponding path program 1 times [2021-11-25 19:06:05,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:05,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651427270] [2021-11-25 19:06:05,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:05,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:05,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:06,000 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:06,000 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:06,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651427270] [2021-11-25 19:06:06,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1651427270] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:06,001 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:06,001 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:06:06,001 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579551456] [2021-11-25 19:06:06,001 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:06,002 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:06:06,002 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:06,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:06:06,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:06:06,003 INFO L87 Difference]: Start difference. First operand 166 states and 237 transitions. Second operand has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:08,017 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:08,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:08,428 INFO L93 Difference]: Finished difference Result 332 states and 476 transitions. [2021-11-25 19:06:08,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:06:08,430 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 states have internal predecessors, (64), 0 states have call successors, (0), 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 64 [2021-11-25 19:06:08,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:08,431 INFO L225 Difference]: With dead ends: 332 [2021-11-25 19:06:08,432 INFO L226 Difference]: Without dead ends: 178 [2021-11-25 19:06:08,432 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 [2021-11-25 19:06:08,433 INFO L933 BasicCegarLoop]: 137 mSDtfsCounter, 20 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:08,434 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 350 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 152 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:06:08,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-11-25 19:06:08,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 166. [2021-11-25 19:06:08,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 165 states have (on average 1.4303030303030304) internal successors, (236), 165 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:08,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 236 transitions. [2021-11-25 19:06:08,444 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 236 transitions. Word has length 64 [2021-11-25 19:06:08,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:08,444 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 236 transitions. [2021-11-25 19:06:08,445 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:08,445 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 236 transitions. [2021-11-25 19:06:08,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 19:06:08,446 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:08,446 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:08,447 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-25 19:06:08,447 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:08,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:08,448 INFO L85 PathProgramCache]: Analyzing trace with hash -1266496181, now seen corresponding path program 1 times [2021-11-25 19:06:08,448 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:08,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [555603932] [2021-11-25 19:06:08,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:08,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:08,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:08,640 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:06:08,640 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:08,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [555603932] [2021-11-25 19:06:08,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [555603932] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:08,641 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:08,641 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 19:06:08,641 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003160601] [2021-11-25 19:06:08,642 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:08,642 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:06:08,642 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:08,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:06:08,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:06:08,643 INFO L87 Difference]: Start difference. First operand 166 states and 236 transitions. Second operand has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 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) [2021-11-25 19:06:10,656 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:11,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:11,182 INFO L93 Difference]: Finished difference Result 328 states and 470 transitions. [2021-11-25 19:06:11,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:06:11,184 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 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) Word has length 66 [2021-11-25 19:06:11,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:11,185 INFO L225 Difference]: With dead ends: 328 [2021-11-25 19:06:11,186 INFO L226 Difference]: Without dead ends: 174 [2021-11-25 19:06:11,186 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:06:11,187 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 117 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 31 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:11,187 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 246 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 262 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 19:06:11,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-11-25 19:06:11,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 173. [2021-11-25 19:06:11,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.4186046511627908) internal successors, (244), 172 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:11,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 244 transitions. [2021-11-25 19:06:11,196 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 244 transitions. Word has length 66 [2021-11-25 19:06:11,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:11,197 INFO L470 AbstractCegarLoop]: Abstraction has 173 states and 244 transitions. [2021-11-25 19:06:11,197 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 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) [2021-11-25 19:06:11,197 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 244 transitions. [2021-11-25 19:06:11,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-25 19:06:11,198 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:11,199 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:11,199 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-25 19:06:11,199 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:11,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:11,200 INFO L85 PathProgramCache]: Analyzing trace with hash 898172994, now seen corresponding path program 1 times [2021-11-25 19:06:11,200 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:11,200 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824911477] [2021-11-25 19:06:11,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:11,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:11,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:11,412 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:11,412 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:11,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1824911477] [2021-11-25 19:06:11,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1824911477] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:11,413 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:11,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:06:11,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140396897] [2021-11-25 19:06:11,413 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:11,413 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:06:11,414 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:11,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:06:11,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:06:11,414 INFO L87 Difference]: Start difference. First operand 173 states and 244 transitions. Second operand has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:13,428 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:13,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:13,982 INFO L93 Difference]: Finished difference Result 413 states and 597 transitions. [2021-11-25 19:06:13,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:06:13,983 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 0 states have call successors, (0), 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 67 [2021-11-25 19:06:13,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:13,986 INFO L225 Difference]: With dead ends: 413 [2021-11-25 19:06:13,986 INFO L226 Difference]: Without dead ends: 252 [2021-11-25 19:06:13,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:06:13,987 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 107 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 42 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:13,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 268 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 220 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 19:06:13,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-11-25 19:06:13,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 173. [2021-11-25 19:06:13,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.4011627906976745) internal successors, (241), 172 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:14,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 241 transitions. [2021-11-25 19:06:14,001 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 241 transitions. Word has length 67 [2021-11-25 19:06:14,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:14,001 INFO L470 AbstractCegarLoop]: Abstraction has 173 states and 241 transitions. [2021-11-25 19:06:14,001 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:14,002 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 241 transitions. [2021-11-25 19:06:14,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 19:06:14,003 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:14,003 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:14,003 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-25 19:06:14,003 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:14,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:14,004 INFO L85 PathProgramCache]: Analyzing trace with hash 2129415668, now seen corresponding path program 1 times [2021-11-25 19:06:14,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:14,005 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526352644] [2021-11-25 19:06:14,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:14,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:14,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:14,319 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:06:14,319 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:14,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526352644] [2021-11-25 19:06:14,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [526352644] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:14,320 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:14,320 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:06:14,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223882057] [2021-11-25 19:06:14,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:14,321 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:06:14,321 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:14,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:06:14,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:06:14,323 INFO L87 Difference]: Start difference. First operand 173 states and 241 transitions. Second operand has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 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) [2021-11-25 19:06:16,343 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:16,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:16,835 INFO L93 Difference]: Finished difference Result 428 states and 609 transitions. [2021-11-25 19:06:16,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:06:16,836 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 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 70 [2021-11-25 19:06:16,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:16,838 INFO L225 Difference]: With dead ends: 428 [2021-11-25 19:06:16,839 INFO L226 Difference]: Without dead ends: 267 [2021-11-25 19:06:16,839 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 [2021-11-25 19:06:16,840 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 82 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 37 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:16,840 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 270 Invalid, 259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 221 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 19:06:16,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2021-11-25 19:06:16,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 210. [2021-11-25 19:06:16,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 209 states have (on average 1.444976076555024) internal successors, (302), 209 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:16,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 302 transitions. [2021-11-25 19:06:16,855 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 302 transitions. Word has length 70 [2021-11-25 19:06:16,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:16,856 INFO L470 AbstractCegarLoop]: Abstraction has 210 states and 302 transitions. [2021-11-25 19:06:16,856 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 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) [2021-11-25 19:06:16,857 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 302 transitions. [2021-11-25 19:06:16,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-25 19:06:16,858 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:16,858 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:16,858 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-25 19:06:16,858 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:16,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:16,859 INFO L85 PathProgramCache]: Analyzing trace with hash -392216061, now seen corresponding path program 1 times [2021-11-25 19:06:16,859 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:16,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947493483] [2021-11-25 19:06:16,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:16,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:17,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:17,147 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:06:17,147 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:17,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947493483] [2021-11-25 19:06:17,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [947493483] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:17,148 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:17,148 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:06:17,149 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405194579] [2021-11-25 19:06:17,149 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:17,149 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:06:17,149 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:17,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:06:17,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:06:17,151 INFO L87 Difference]: Start difference. First operand 210 states and 302 transitions. Second operand has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:19,167 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:19,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:19,714 INFO L93 Difference]: Finished difference Result 487 states and 713 transitions. [2021-11-25 19:06:19,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:06:19,716 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 0 states have call successors, (0), 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 71 [2021-11-25 19:06:19,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:19,718 INFO L225 Difference]: With dead ends: 487 [2021-11-25 19:06:19,718 INFO L226 Difference]: Without dead ends: 289 [2021-11-25 19:06:19,719 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 [2021-11-25 19:06:19,720 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 81 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 40 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:19,720 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 288 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 221 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 19:06:19,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-25 19:06:19,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 233. [2021-11-25 19:06:19,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 232 states have (on average 1.4956896551724137) internal successors, (347), 232 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:19,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 347 transitions. [2021-11-25 19:06:19,740 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 347 transitions. Word has length 71 [2021-11-25 19:06:19,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:19,742 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 347 transitions. [2021-11-25 19:06:19,742 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:19,742 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 347 transitions. [2021-11-25 19:06:19,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-25 19:06:19,743 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:19,744 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:19,744 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-25 19:06:19,744 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:19,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:19,745 INFO L85 PathProgramCache]: Analyzing trace with hash 2012170660, now seen corresponding path program 1 times [2021-11-25 19:06:19,745 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:19,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1123413754] [2021-11-25 19:06:19,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:19,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:19,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:20,112 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 78 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:06:20,113 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:20,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1123413754] [2021-11-25 19:06:20,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1123413754] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:20,114 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:20,115 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:06:20,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031846289] [2021-11-25 19:06:20,119 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:20,119 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:06:20,120 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:20,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:06:20,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:06:20,121 INFO L87 Difference]: Start difference. First operand 233 states and 347 transitions. Second operand has 6 states, 6 states have (on average 14.833333333333334) internal successors, (89), 6 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:22,138 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:22,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:22,916 INFO L93 Difference]: Finished difference Result 530 states and 793 transitions. [2021-11-25 19:06:22,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:06:22,918 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.833333333333334) internal successors, (89), 6 states have internal predecessors, (89), 0 states have call successors, (0), 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 98 [2021-11-25 19:06:22,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:22,920 INFO L225 Difference]: With dead ends: 530 [2021-11-25 19:06:22,921 INFO L226 Difference]: Without dead ends: 309 [2021-11-25 19:06:22,921 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:06:22,922 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 172 mSDsluCounter, 306 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 172 SdHoareTripleChecker+Valid, 405 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:22,922 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [172 Valid, 405 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 338 Invalid, 1 Unknown, 0 Unchecked, 2.7s Time] [2021-11-25 19:06:22,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2021-11-25 19:06:22,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 263. [2021-11-25 19:06:22,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 262 states have (on average 1.5038167938931297) internal successors, (394), 262 states have internal predecessors, (394), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:22,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 394 transitions. [2021-11-25 19:06:22,942 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 394 transitions. Word has length 98 [2021-11-25 19:06:22,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:22,943 INFO L470 AbstractCegarLoop]: Abstraction has 263 states and 394 transitions. [2021-11-25 19:06:22,944 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.833333333333334) internal successors, (89), 6 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:22,944 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 394 transitions. [2021-11-25 19:06:22,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-25 19:06:22,950 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:22,951 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:22,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-25 19:06:22,951 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:22,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:22,952 INFO L85 PathProgramCache]: Analyzing trace with hash -1076018587, now seen corresponding path program 1 times [2021-11-25 19:06:22,952 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:22,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [256700848] [2021-11-25 19:06:22,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:22,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:23,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:23,255 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 83 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:06:23,255 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:23,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [256700848] [2021-11-25 19:06:23,255 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [256700848] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:23,256 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:23,256 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:06:23,256 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695827056] [2021-11-25 19:06:23,256 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:23,257 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:06:23,257 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:23,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:06:23,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:06:23,258 INFO L87 Difference]: Start difference. First operand 263 states and 394 transitions. Second operand has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 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) [2021-11-25 19:06:25,272 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:25,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:25,875 INFO L93 Difference]: Finished difference Result 608 states and 913 transitions. [2021-11-25 19:06:25,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:06:25,876 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 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 103 [2021-11-25 19:06:25,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:25,879 INFO L225 Difference]: With dead ends: 608 [2021-11-25 19:06:25,879 INFO L226 Difference]: Without dead ends: 357 [2021-11-25 19:06:25,880 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 [2021-11-25 19:06:25,881 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 83 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 39 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:25,881 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 270 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 220 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2021-11-25 19:06:25,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2021-11-25 19:06:25,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 298. [2021-11-25 19:06:25,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 297 states have (on average 1.5151515151515151) internal successors, (450), 297 states have internal predecessors, (450), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:25,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 450 transitions. [2021-11-25 19:06:25,901 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 450 transitions. Word has length 103 [2021-11-25 19:06:25,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:25,901 INFO L470 AbstractCegarLoop]: Abstraction has 298 states and 450 transitions. [2021-11-25 19:06:25,902 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 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) [2021-11-25 19:06:25,902 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 450 transitions. [2021-11-25 19:06:25,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-25 19:06:25,904 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:25,904 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:25,904 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-25 19:06:25,904 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:25,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:25,905 INFO L85 PathProgramCache]: Analyzing trace with hash 261800854, now seen corresponding path program 1 times [2021-11-25 19:06:25,905 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:25,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997554936] [2021-11-25 19:06:25,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:25,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:26,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:26,206 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 84 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:06:26,206 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:26,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1997554936] [2021-11-25 19:06:26,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1997554936] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:26,207 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:26,207 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:06:26,207 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919273744] [2021-11-25 19:06:26,207 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:26,208 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:06:26,208 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:26,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:06:26,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:06:26,209 INFO L87 Difference]: Start difference. First operand 298 states and 450 transitions. Second operand has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:28,223 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:28,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:28,777 INFO L93 Difference]: Finished difference Result 640 states and 963 transitions. [2021-11-25 19:06:28,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:06:28,778 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 0 states have call successors, (0), 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 104 [2021-11-25 19:06:28,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:28,781 INFO L225 Difference]: With dead ends: 640 [2021-11-25 19:06:28,782 INFO L226 Difference]: Without dead ends: 354 [2021-11-25 19:06:28,783 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 [2021-11-25 19:06:28,783 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 82 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 41 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:28,784 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 270 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 219 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 19:06:28,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2021-11-25 19:06:28,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 298. [2021-11-25 19:06:28,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 297 states have (on average 1.5084175084175084) internal successors, (448), 297 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:28,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 448 transitions. [2021-11-25 19:06:28,804 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 448 transitions. Word has length 104 [2021-11-25 19:06:28,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:28,805 INFO L470 AbstractCegarLoop]: Abstraction has 298 states and 448 transitions. [2021-11-25 19:06:28,805 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:28,806 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 448 transitions. [2021-11-25 19:06:28,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-25 19:06:28,808 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:28,808 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:28,808 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-25 19:06:28,808 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:28,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:28,809 INFO L85 PathProgramCache]: Analyzing trace with hash 1283875, now seen corresponding path program 1 times [2021-11-25 19:06:28,809 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:28,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207916176] [2021-11-25 19:06:28,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:28,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:28,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:29,125 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 85 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:06:29,125 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:29,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207916176] [2021-11-25 19:06:29,126 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [207916176] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:29,126 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:29,126 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:06:29,126 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328496450] [2021-11-25 19:06:29,127 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:29,128 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:06:29,129 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:29,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:06:29,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:06:29,130 INFO L87 Difference]: Start difference. First operand 298 states and 448 transitions. Second operand has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 6 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:31,144 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:31,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:31,956 INFO L93 Difference]: Finished difference Result 623 states and 936 transitions. [2021-11-25 19:06:31,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:06:31,958 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 6 states have internal predecessors, (100), 0 states have call successors, (0), 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 109 [2021-11-25 19:06:31,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:31,960 INFO L225 Difference]: With dead ends: 623 [2021-11-25 19:06:31,961 INFO L226 Difference]: Without dead ends: 337 [2021-11-25 19:06:31,961 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:06:31,962 INFO L933 BasicCegarLoop]: 123 mSDtfsCounter, 103 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 354 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 426 SdHoareTripleChecker+Invalid, 362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 354 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:31,963 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 426 Invalid, 362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 354 Invalid, 1 Unknown, 0 Unchecked, 2.8s Time] [2021-11-25 19:06:31,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2021-11-25 19:06:31,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 307. [2021-11-25 19:06:31,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 307 states, 306 states have (on average 1.5065359477124183) internal successors, (461), 306 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:31,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 461 transitions. [2021-11-25 19:06:31,981 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 461 transitions. Word has length 109 [2021-11-25 19:06:31,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:31,982 INFO L470 AbstractCegarLoop]: Abstraction has 307 states and 461 transitions. [2021-11-25 19:06:31,982 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 6 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:31,982 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 461 transitions. [2021-11-25 19:06:31,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-25 19:06:31,984 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:31,984 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:31,985 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-25 19:06:31,985 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:31,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:31,986 INFO L85 PathProgramCache]: Analyzing trace with hash -1827513560, now seen corresponding path program 1 times [2021-11-25 19:06:31,986 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:31,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681669886] [2021-11-25 19:06:31,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:31,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:32,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:32,187 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 102 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-25 19:06:32,187 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:32,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681669886] [2021-11-25 19:06:32,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1681669886] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:32,188 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:32,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:06:32,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524419041] [2021-11-25 19:06:32,189 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:32,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:06:32,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:32,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:06:32,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:06:32,190 INFO L87 Difference]: Start difference. First operand 307 states and 461 transitions. Second operand has 4 states, 4 states have (on average 22.5) internal successors, (90), 4 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:34,205 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:34,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:34,797 INFO L93 Difference]: Finished difference Result 672 states and 1012 transitions. [2021-11-25 19:06:34,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:06:34,799 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.5) internal successors, (90), 4 states have internal predecessors, (90), 0 states have call successors, (0), 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 110 [2021-11-25 19:06:34,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:34,802 INFO L225 Difference]: With dead ends: 672 [2021-11-25 19:06:34,802 INFO L226 Difference]: Without dead ends: 377 [2021-11-25 19:06:34,803 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 [2021-11-25 19:06:34,804 INFO L933 BasicCegarLoop]: 180 mSDtfsCounter, 59 mSDsluCounter, 273 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 435 SdHoareTripleChecker+Invalid, 246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:34,804 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 435 Invalid, 246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 242 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2021-11-25 19:06:34,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2021-11-25 19:06:34,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 337. [2021-11-25 19:06:34,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 336 states have (on average 1.5119047619047619) internal successors, (508), 336 states have internal predecessors, (508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:34,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 508 transitions. [2021-11-25 19:06:34,826 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 508 transitions. Word has length 110 [2021-11-25 19:06:34,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:34,826 INFO L470 AbstractCegarLoop]: Abstraction has 337 states and 508 transitions. [2021-11-25 19:06:34,827 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.5) internal successors, (90), 4 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:34,827 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 508 transitions. [2021-11-25 19:06:34,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-25 19:06:34,829 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:34,829 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:34,830 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-25 19:06:34,830 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:34,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:34,831 INFO L85 PathProgramCache]: Analyzing trace with hash -1047223584, now seen corresponding path program 1 times [2021-11-25 19:06:34,831 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:34,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532037811] [2021-11-25 19:06:34,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:34,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:34,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:35,062 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 108 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 19:06:35,062 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:35,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532037811] [2021-11-25 19:06:35,063 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532037811] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:35,063 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:35,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:06:35,064 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813594522] [2021-11-25 19:06:35,064 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:35,064 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:06:35,065 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:35,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:06:35,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:06:35,066 INFO L87 Difference]: Start difference. First operand 337 states and 508 transitions. Second operand has 4 states, 4 states have (on average 22.5) internal successors, (90), 4 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:37,084 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:37,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:37,434 INFO L93 Difference]: Finished difference Result 695 states and 1050 transitions. [2021-11-25 19:06:37,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:06:37,435 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.5) internal successors, (90), 4 states have internal predecessors, (90), 0 states have call successors, (0), 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 119 [2021-11-25 19:06:37,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:37,438 INFO L225 Difference]: With dead ends: 695 [2021-11-25 19:06:37,438 INFO L226 Difference]: Without dead ends: 370 [2021-11-25 19:06:37,439 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 [2021-11-25 19:06:37,440 INFO L933 BasicCegarLoop]: 163 mSDtfsCounter, 19 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 401 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:37,440 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 401 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 171 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-25 19:06:37,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2021-11-25 19:06:37,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 361. [2021-11-25 19:06:37,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 361 states, 360 states have (on average 1.5083333333333333) internal successors, (543), 360 states have internal predecessors, (543), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:37,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 361 states to 361 states and 543 transitions. [2021-11-25 19:06:37,461 INFO L78 Accepts]: Start accepts. Automaton has 361 states and 543 transitions. Word has length 119 [2021-11-25 19:06:37,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:37,462 INFO L470 AbstractCegarLoop]: Abstraction has 361 states and 543 transitions. [2021-11-25 19:06:37,462 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.5) internal successors, (90), 4 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:37,462 INFO L276 IsEmpty]: Start isEmpty. Operand 361 states and 543 transitions. [2021-11-25 19:06:37,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-25 19:06:37,464 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:37,465 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:37,465 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-25 19:06:37,465 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:37,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:37,466 INFO L85 PathProgramCache]: Analyzing trace with hash 1688546079, now seen corresponding path program 1 times [2021-11-25 19:06:37,466 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:37,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1002770437] [2021-11-25 19:06:37,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:37,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:37,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:37,669 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 109 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-25 19:06:37,669 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:37,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1002770437] [2021-11-25 19:06:37,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1002770437] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:37,670 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:37,670 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:06:37,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653350071] [2021-11-25 19:06:37,671 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:37,671 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:06:37,671 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:37,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:06:37,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:06:37,672 INFO L87 Difference]: Start difference. First operand 361 states and 543 transitions. Second operand has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:39,686 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:40,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:40,161 INFO L93 Difference]: Finished difference Result 750 states and 1128 transitions. [2021-11-25 19:06:40,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:06:40,165 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 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 121 [2021-11-25 19:06:40,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:40,167 INFO L225 Difference]: With dead ends: 750 [2021-11-25 19:06:40,167 INFO L226 Difference]: Without dead ends: 401 [2021-11-25 19:06:40,168 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 [2021-11-25 19:06:40,169 INFO L933 BasicCegarLoop]: 180 mSDtfsCounter, 47 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 437 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:40,169 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 437 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 241 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 19:06:40,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2021-11-25 19:06:40,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 372. [2021-11-25 19:06:40,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 372 states, 371 states have (on average 1.509433962264151) internal successors, (560), 371 states have internal predecessors, (560), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:40,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 560 transitions. [2021-11-25 19:06:40,187 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 560 transitions. Word has length 121 [2021-11-25 19:06:40,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:40,188 INFO L470 AbstractCegarLoop]: Abstraction has 372 states and 560 transitions. [2021-11-25 19:06:40,188 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:40,188 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 560 transitions. [2021-11-25 19:06:40,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-25 19:06:40,190 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:40,190 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:40,190 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-25 19:06:40,191 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:40,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:40,191 INFO L85 PathProgramCache]: Analyzing trace with hash 768637452, now seen corresponding path program 1 times [2021-11-25 19:06:40,191 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:40,191 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218203274] [2021-11-25 19:06:40,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:40,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:40,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:40,377 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 120 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-25 19:06:40,377 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:40,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218203274] [2021-11-25 19:06:40,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1218203274] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:40,378 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:40,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:06:40,378 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410132486] [2021-11-25 19:06:40,378 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:40,378 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:06:40,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:40,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:06:40,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:06:40,379 INFO L87 Difference]: Start difference. First operand 372 states and 560 transitions. Second operand has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:42,391 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:42,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:42,755 INFO L93 Difference]: Finished difference Result 779 states and 1177 transitions. [2021-11-25 19:06:42,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:06:42,756 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 0 states have call successors, (0), 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 122 [2021-11-25 19:06:42,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:42,758 INFO L225 Difference]: With dead ends: 779 [2021-11-25 19:06:42,758 INFO L226 Difference]: Without dead ends: 419 [2021-11-25 19:06:42,758 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 [2021-11-25 19:06:42,759 INFO L933 BasicCegarLoop]: 172 mSDtfsCounter, 33 mSDsluCounter, 266 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 5 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 419 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:42,760 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 419 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 200 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-25 19:06:42,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2021-11-25 19:06:42,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 400. [2021-11-25 19:06:42,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 400 states, 399 states have (on average 1.5112781954887218) internal successors, (603), 399 states have internal predecessors, (603), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:42,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 603 transitions. [2021-11-25 19:06:42,776 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 603 transitions. Word has length 122 [2021-11-25 19:06:42,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:42,777 INFO L470 AbstractCegarLoop]: Abstraction has 400 states and 603 transitions. [2021-11-25 19:06:42,777 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:42,777 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 603 transitions. [2021-11-25 19:06:42,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-25 19:06:42,779 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:42,779 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:42,779 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-25 19:06:42,780 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:42,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:42,780 INFO L85 PathProgramCache]: Analyzing trace with hash -250067720, now seen corresponding path program 1 times [2021-11-25 19:06:42,780 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:42,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1878142391] [2021-11-25 19:06:42,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:42,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:42,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:42,943 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 109 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-25 19:06:42,943 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:42,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1878142391] [2021-11-25 19:06:42,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1878142391] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:42,944 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:42,944 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:06:42,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093344527] [2021-11-25 19:06:42,944 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:42,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:06:42,945 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:42,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:06:42,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:06:42,946 INFO L87 Difference]: Start difference. First operand 400 states and 603 transitions. Second operand has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:44,957 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:45,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:45,486 INFO L93 Difference]: Finished difference Result 815 states and 1228 transitions. [2021-11-25 19:06:45,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:06:45,489 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 0 states have call successors, (0), 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 122 [2021-11-25 19:06:45,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:45,493 INFO L225 Difference]: With dead ends: 815 [2021-11-25 19:06:45,493 INFO L226 Difference]: Without dead ends: 425 [2021-11-25 19:06:45,494 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 [2021-11-25 19:06:45,495 INFO L933 BasicCegarLoop]: 180 mSDtfsCounter, 45 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 437 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:45,496 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 437 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 241 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 19:06:45,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 425 states. [2021-11-25 19:06:45,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 425 to 399. [2021-11-25 19:06:45,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 399 states, 398 states have (on average 1.5100502512562815) internal successors, (601), 398 states have internal predecessors, (601), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:45,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 601 transitions. [2021-11-25 19:06:45,517 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 601 transitions. Word has length 122 [2021-11-25 19:06:45,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:45,517 INFO L470 AbstractCegarLoop]: Abstraction has 399 states and 601 transitions. [2021-11-25 19:06:45,517 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:45,518 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 601 transitions. [2021-11-25 19:06:45,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-25 19:06:45,520 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:45,520 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:45,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-25 19:06:45,521 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:45,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:45,523 INFO L85 PathProgramCache]: Analyzing trace with hash -1671801271, now seen corresponding path program 1 times [2021-11-25 19:06:45,523 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:45,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31961029] [2021-11-25 19:06:45,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:45,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:45,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:45,737 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 118 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 19:06:45,738 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:45,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31961029] [2021-11-25 19:06:45,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31961029] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:45,738 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:45,739 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:06:45,739 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475153982] [2021-11-25 19:06:45,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:45,740 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:06:45,740 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:45,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:06:45,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:06:45,741 INFO L87 Difference]: Start difference. First operand 399 states and 601 transitions. Second operand has 4 states, 4 states have (on average 24.75) internal successors, (99), 4 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) [2021-11-25 19:06:47,754 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:48,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:48,174 INFO L93 Difference]: Finished difference Result 914 states and 1381 transitions. [2021-11-25 19:06:48,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:06:48,185 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.75) internal successors, (99), 4 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) Word has length 123 [2021-11-25 19:06:48,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:48,188 INFO L225 Difference]: With dead ends: 914 [2021-11-25 19:06:48,188 INFO L226 Difference]: Without dead ends: 527 [2021-11-25 19:06:48,189 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 [2021-11-25 19:06:48,190 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 86 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 31 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:48,190 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 294 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 220 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:06:48,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 527 states. [2021-11-25 19:06:48,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 527 to 459. [2021-11-25 19:06:48,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 458 states have (on average 1.51528384279476) internal successors, (694), 458 states have internal predecessors, (694), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:48,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 694 transitions. [2021-11-25 19:06:48,210 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 694 transitions. Word has length 123 [2021-11-25 19:06:48,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:48,211 INFO L470 AbstractCegarLoop]: Abstraction has 459 states and 694 transitions. [2021-11-25 19:06:48,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.75) internal successors, (99), 4 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) [2021-11-25 19:06:48,211 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 694 transitions. [2021-11-25 19:06:48,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-25 19:06:48,213 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:48,214 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:48,214 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-25 19:06:48,214 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:48,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:48,215 INFO L85 PathProgramCache]: Analyzing trace with hash 1598624402, now seen corresponding path program 1 times [2021-11-25 19:06:48,215 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:48,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712974418] [2021-11-25 19:06:48,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:48,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:48,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:48,516 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 126 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 19:06:48,516 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:48,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712974418] [2021-11-25 19:06:48,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1712974418] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:48,517 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:48,517 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:06:48,517 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872086629] [2021-11-25 19:06:48,517 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:48,518 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:06:48,518 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:48,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:06:48,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:06:48,519 INFO L87 Difference]: Start difference. First operand 459 states and 694 transitions. Second operand has 6 states, 6 states have (on average 15.0) internal successors, (90), 6 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:50,527 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:51,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:51,124 INFO L93 Difference]: Finished difference Result 936 states and 1414 transitions. [2021-11-25 19:06:51,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:06:51,125 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.0) internal successors, (90), 6 states have internal predecessors, (90), 0 states have call successors, (0), 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 124 [2021-11-25 19:06:51,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:51,128 INFO L225 Difference]: With dead ends: 936 [2021-11-25 19:06:51,128 INFO L226 Difference]: Without dead ends: 489 [2021-11-25 19:06:51,129 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:06:51,129 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 65 mSDsluCounter, 404 mSDsCounter, 0 mSdLazyCounter, 432 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 439 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 432 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:51,130 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 501 Invalid, 439 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 432 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2021-11-25 19:06:51,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 489 states. [2021-11-25 19:06:51,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 489 to 459. [2021-11-25 19:06:51,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 458 states have (on average 1.5131004366812226) internal successors, (693), 458 states have internal predecessors, (693), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:51,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 693 transitions. [2021-11-25 19:06:51,147 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 693 transitions. Word has length 124 [2021-11-25 19:06:51,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:51,147 INFO L470 AbstractCegarLoop]: Abstraction has 459 states and 693 transitions. [2021-11-25 19:06:51,148 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.0) internal successors, (90), 6 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:51,148 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 693 transitions. [2021-11-25 19:06:51,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-25 19:06:51,150 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:51,150 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:51,150 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-25 19:06:51,150 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:51,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:51,151 INFO L85 PathProgramCache]: Analyzing trace with hash 1254865414, now seen corresponding path program 1 times [2021-11-25 19:06:51,151 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:51,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346534956] [2021-11-25 19:06:51,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:51,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:51,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:51,435 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 128 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 19:06:51,435 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:51,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346534956] [2021-11-25 19:06:51,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1346534956] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:51,436 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:51,436 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:06:51,436 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873349557] [2021-11-25 19:06:51,436 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:51,437 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:06:51,437 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:51,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:06:51,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:06:51,438 INFO L87 Difference]: Start difference. First operand 459 states and 693 transitions. Second operand has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:53,449 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:53,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:53,914 INFO L93 Difference]: Finished difference Result 934 states and 1410 transitions. [2021-11-25 19:06:53,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:06:53,915 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 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 125 [2021-11-25 19:06:53,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:53,918 INFO L225 Difference]: With dead ends: 934 [2021-11-25 19:06:53,918 INFO L226 Difference]: Without dead ends: 487 [2021-11-25 19:06:53,919 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:06:53,920 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 134 mSDsluCounter, 312 mSDsCounter, 0 mSdLazyCounter, 328 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 415 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 328 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:53,921 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 415 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 328 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:06:53,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 487 states. [2021-11-25 19:06:53,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 487 to 459. [2021-11-25 19:06:53,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 458 states have (on average 1.5109170305676856) internal successors, (692), 458 states have internal predecessors, (692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:53,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 692 transitions. [2021-11-25 19:06:53,942 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 692 transitions. Word has length 125 [2021-11-25 19:06:53,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:53,942 INFO L470 AbstractCegarLoop]: Abstraction has 459 states and 692 transitions. [2021-11-25 19:06:53,942 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:53,943 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 692 transitions. [2021-11-25 19:06:53,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-25 19:06:53,945 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:53,945 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:53,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-11-25 19:06:53,946 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:53,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:53,946 INFO L85 PathProgramCache]: Analyzing trace with hash -1470609235, now seen corresponding path program 1 times [2021-11-25 19:06:53,947 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:53,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616556890] [2021-11-25 19:06:53,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:53,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:54,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:54,284 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 122 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 19:06:54,284 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:54,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616556890] [2021-11-25 19:06:54,285 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1616556890] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:54,285 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:54,285 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:06:54,285 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048062532] [2021-11-25 19:06:54,286 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:54,286 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:06:54,286 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:54,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:06:54,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:06:54,287 INFO L87 Difference]: Start difference. First operand 459 states and 692 transitions. Second operand has 6 states, 6 states have (on average 15.5) internal successors, (93), 6 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:56,300 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:56,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:56,887 INFO L93 Difference]: Finished difference Result 934 states and 1408 transitions. [2021-11-25 19:06:56,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:06:56,888 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.5) internal successors, (93), 6 states have internal predecessors, (93), 0 states have call successors, (0), 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 127 [2021-11-25 19:06:56,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:56,891 INFO L225 Difference]: With dead ends: 934 [2021-11-25 19:06:56,891 INFO L226 Difference]: Without dead ends: 487 [2021-11-25 19:06:56,892 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:06:56,892 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 60 mSDsluCounter, 405 mSDsCounter, 0 mSdLazyCounter, 430 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 503 SdHoareTripleChecker+Invalid, 437 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 430 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:56,892 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 503 Invalid, 437 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 430 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2021-11-25 19:06:56,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 487 states. [2021-11-25 19:06:56,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 487 to 459. [2021-11-25 19:06:56,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 458 states have (on average 1.5087336244541485) internal successors, (691), 458 states have internal predecessors, (691), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:56,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 691 transitions. [2021-11-25 19:06:56,911 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 691 transitions. Word has length 127 [2021-11-25 19:06:56,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:56,911 INFO L470 AbstractCegarLoop]: Abstraction has 459 states and 691 transitions. [2021-11-25 19:06:56,911 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.5) internal successors, (93), 6 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:56,911 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 691 transitions. [2021-11-25 19:06:56,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-25 19:06:56,913 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:56,913 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:56,913 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-11-25 19:06:56,914 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:56,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:56,914 INFO L85 PathProgramCache]: Analyzing trace with hash -754716327, now seen corresponding path program 1 times [2021-11-25 19:06:56,914 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:56,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120203016] [2021-11-25 19:06:56,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:56,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:57,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:57,130 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 124 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 19:06:57,131 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:57,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120203016] [2021-11-25 19:06:57,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [120203016] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:57,131 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:57,131 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:06:57,132 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231801910] [2021-11-25 19:06:57,132 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:57,132 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:06:57,132 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:57,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:06:57,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:06:57,133 INFO L87 Difference]: Start difference. First operand 459 states and 691 transitions. Second operand has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 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) [2021-11-25 19:06:59,148 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:06:59,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:59,677 INFO L93 Difference]: Finished difference Result 926 states and 1393 transitions. [2021-11-25 19:06:59,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:06:59,678 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 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 128 [2021-11-25 19:06:59,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:59,680 INFO L225 Difference]: With dead ends: 926 [2021-11-25 19:06:59,681 INFO L226 Difference]: Without dead ends: 479 [2021-11-25 19:06:59,682 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:06:59,682 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 75 mSDsluCounter, 337 mSDsCounter, 0 mSdLazyCounter, 332 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 448 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 332 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:59,682 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 448 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 332 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 19:06:59,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2021-11-25 19:06:59,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 459. [2021-11-25 19:06:59,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 458 states have (on average 1.5065502183406114) internal successors, (690), 458 states have internal predecessors, (690), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:59,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 690 transitions. [2021-11-25 19:06:59,702 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 690 transitions. Word has length 128 [2021-11-25 19:06:59,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:59,702 INFO L470 AbstractCegarLoop]: Abstraction has 459 states and 690 transitions. [2021-11-25 19:06:59,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 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) [2021-11-25 19:06:59,703 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 690 transitions. [2021-11-25 19:06:59,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-25 19:06:59,704 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:59,704 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:59,704 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-11-25 19:06:59,705 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:59,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:59,705 INFO L85 PathProgramCache]: Analyzing trace with hash -1006067362, now seen corresponding path program 1 times [2021-11-25 19:06:59,705 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:59,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [564022429] [2021-11-25 19:06:59,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:59,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:59,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:59,887 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 125 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 19:06:59,888 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:59,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [564022429] [2021-11-25 19:06:59,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [564022429] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:59,888 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:59,888 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:06:59,889 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195655570] [2021-11-25 19:06:59,889 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:59,889 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:06:59,889 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:59,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:06:59,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:06:59,890 INFO L87 Difference]: Start difference. First operand 459 states and 690 transitions. Second operand has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:01,902 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:02,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:02,243 INFO L93 Difference]: Finished difference Result 1000 states and 1502 transitions. [2021-11-25 19:07:02,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:02,244 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 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 134 [2021-11-25 19:07:02,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:02,247 INFO L225 Difference]: With dead ends: 1000 [2021-11-25 19:07:02,247 INFO L226 Difference]: Without dead ends: 553 [2021-11-25 19:07:02,248 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 [2021-11-25 19:07:02,249 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 75 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 40 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:02,249 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 271 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 220 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-25 19:07:02,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 553 states. [2021-11-25 19:07:02,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 553 to 500. [2021-11-25 19:07:02,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 500 states, 499 states have (on average 1.5110220440881763) internal successors, (754), 499 states have internal predecessors, (754), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:02,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 500 states to 500 states and 754 transitions. [2021-11-25 19:07:02,270 INFO L78 Accepts]: Start accepts. Automaton has 500 states and 754 transitions. Word has length 134 [2021-11-25 19:07:02,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:02,271 INFO L470 AbstractCegarLoop]: Abstraction has 500 states and 754 transitions. [2021-11-25 19:07:02,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:02,271 INFO L276 IsEmpty]: Start isEmpty. Operand 500 states and 754 transitions. [2021-11-25 19:07:02,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-25 19:07:02,272 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:02,273 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:02,273 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-11-25 19:07:02,273 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:02,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:02,274 INFO L85 PathProgramCache]: Analyzing trace with hash -1382312583, now seen corresponding path program 1 times [2021-11-25 19:07:02,274 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:02,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335708276] [2021-11-25 19:07:02,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:02,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:02,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:02,489 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 136 proven. 0 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-25 19:07:02,489 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:02,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335708276] [2021-11-25 19:07:02,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1335708276] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:02,490 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:02,490 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:07:02,490 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939582134] [2021-11-25 19:07:02,490 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:02,491 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:07:02,491 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:02,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:07:02,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:07:02,492 INFO L87 Difference]: Start difference. First operand 500 states and 754 transitions. Second operand has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:04,504 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:04,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:04,833 INFO L93 Difference]: Finished difference Result 1085 states and 1635 transitions. [2021-11-25 19:07:04,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:04,834 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 0 states have call successors, (0), 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 134 [2021-11-25 19:07:04,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:04,837 INFO L225 Difference]: With dead ends: 1085 [2021-11-25 19:07:04,837 INFO L226 Difference]: Without dead ends: 597 [2021-11-25 19:07:04,838 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 [2021-11-25 19:07:04,838 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 84 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 39 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:04,839 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 270 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 220 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-25 19:07:04,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 597 states. [2021-11-25 19:07:04,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 597 to 533. [2021-11-25 19:07:04,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 533 states, 532 states have (on average 1.505639097744361) internal successors, (801), 532 states have internal predecessors, (801), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:04,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 533 states to 533 states and 801 transitions. [2021-11-25 19:07:04,861 INFO L78 Accepts]: Start accepts. Automaton has 533 states and 801 transitions. Word has length 134 [2021-11-25 19:07:04,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:04,861 INFO L470 AbstractCegarLoop]: Abstraction has 533 states and 801 transitions. [2021-11-25 19:07:04,861 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:04,862 INFO L276 IsEmpty]: Start isEmpty. Operand 533 states and 801 transitions. [2021-11-25 19:07:04,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-25 19:07:04,863 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:04,864 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:04,864 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-11-25 19:07:04,864 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:04,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:04,864 INFO L85 PathProgramCache]: Analyzing trace with hash 2116261529, now seen corresponding path program 1 times [2021-11-25 19:07:04,865 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:04,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577262410] [2021-11-25 19:07:04,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:04,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:04,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:05,046 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 114 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-25 19:07:05,046 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:05,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577262410] [2021-11-25 19:07:05,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1577262410] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:05,047 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:05,047 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:07:05,048 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253063605] [2021-11-25 19:07:05,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:05,048 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:07:05,048 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:05,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:07:05,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:07:05,049 INFO L87 Difference]: Start difference. First operand 533 states and 801 transitions. Second operand has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:07,061 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:07,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:07,438 INFO L93 Difference]: Finished difference Result 1097 states and 1653 transitions. [2021-11-25 19:07:07,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:07,439 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 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 135 [2021-11-25 19:07:07,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:07,442 INFO L225 Difference]: With dead ends: 1097 [2021-11-25 19:07:07,442 INFO L226 Difference]: Without dead ends: 576 [2021-11-25 19:07:07,443 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 [2021-11-25 19:07:07,444 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 30 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 413 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:07,444 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 413 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 198 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:07:07,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 576 states. [2021-11-25 19:07:07,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 576 to 559. [2021-11-25 19:07:07,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 559 states, 558 states have (on average 1.5053763440860215) internal successors, (840), 558 states have internal predecessors, (840), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:07,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 559 states to 559 states and 840 transitions. [2021-11-25 19:07:07,472 INFO L78 Accepts]: Start accepts. Automaton has 559 states and 840 transitions. Word has length 135 [2021-11-25 19:07:07,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:07,473 INFO L470 AbstractCegarLoop]: Abstraction has 559 states and 840 transitions. [2021-11-25 19:07:07,473 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:07,473 INFO L276 IsEmpty]: Start isEmpty. Operand 559 states and 840 transitions. [2021-11-25 19:07:07,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-25 19:07:07,475 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:07,476 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:07,476 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-11-25 19:07:07,476 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:07,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:07,477 INFO L85 PathProgramCache]: Analyzing trace with hash -1728503096, now seen corresponding path program 1 times [2021-11-25 19:07:07,477 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:07,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1363522935] [2021-11-25 19:07:07,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:07,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:07,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:07,766 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 138 proven. 0 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-25 19:07:07,767 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:07,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1363522935] [2021-11-25 19:07:07,767 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1363522935] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:07,767 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:07,767 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 19:07:07,768 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409576021] [2021-11-25 19:07:07,768 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:07,769 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:07:07,769 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:07,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:07:07,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:07:07,770 INFO L87 Difference]: Start difference. First operand 559 states and 840 transitions. Second operand has 5 states, 5 states have (on average 19.2) internal successors, (96), 5 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) [2021-11-25 19:07:09,790 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:10,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:10,383 INFO L93 Difference]: Finished difference Result 1162 states and 1743 transitions. [2021-11-25 19:07:10,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:10,384 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.2) internal successors, (96), 5 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) Word has length 135 [2021-11-25 19:07:10,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:10,388 INFO L225 Difference]: With dead ends: 1162 [2021-11-25 19:07:10,388 INFO L226 Difference]: Without dead ends: 615 [2021-11-25 19:07:10,389 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:07:10,390 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 111 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 284 mSolverCounterSat, 42 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 364 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 284 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:10,390 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 364 Invalid, 327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 284 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2021-11-25 19:07:10,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 615 states. [2021-11-25 19:07:10,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 615 to 559. [2021-11-25 19:07:10,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 559 states, 558 states have (on average 1.4946236559139785) internal successors, (834), 558 states have internal predecessors, (834), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:10,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 559 states to 559 states and 834 transitions. [2021-11-25 19:07:10,419 INFO L78 Accepts]: Start accepts. Automaton has 559 states and 834 transitions. Word has length 135 [2021-11-25 19:07:10,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:10,419 INFO L470 AbstractCegarLoop]: Abstraction has 559 states and 834 transitions. [2021-11-25 19:07:10,420 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.2) internal successors, (96), 5 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) [2021-11-25 19:07:10,420 INFO L276 IsEmpty]: Start isEmpty. Operand 559 states and 834 transitions. [2021-11-25 19:07:10,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-25 19:07:10,422 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:10,422 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:10,422 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-11-25 19:07:10,423 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:10,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:10,423 INFO L85 PathProgramCache]: Analyzing trace with hash -191527146, now seen corresponding path program 1 times [2021-11-25 19:07:10,424 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:10,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [572981314] [2021-11-25 19:07:10,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:10,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:10,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:10,618 INFO L134 CoverageAnalysis]: Checked inductivity of 219 backedges. 162 proven. 0 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-25 19:07:10,619 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:10,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [572981314] [2021-11-25 19:07:10,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [572981314] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:10,619 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:10,619 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:07:10,620 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870926759] [2021-11-25 19:07:10,620 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:10,620 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:07:10,620 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:10,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:07:10,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:07:10,621 INFO L87 Difference]: Start difference. First operand 559 states and 834 transitions. Second operand has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:12,633 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:13,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:13,048 INFO L93 Difference]: Finished difference Result 1130 states and 1687 transitions. [2021-11-25 19:07:13,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:13,049 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 0 states have call successors, (0), 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 136 [2021-11-25 19:07:13,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:13,053 INFO L225 Difference]: With dead ends: 1130 [2021-11-25 19:07:13,054 INFO L226 Difference]: Without dead ends: 583 [2021-11-25 19:07:13,055 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 [2021-11-25 19:07:13,055 INFO L933 BasicCegarLoop]: 160 mSDtfsCounter, 52 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 395 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:13,056 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 395 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 230 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:07:13,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 583 states. [2021-11-25 19:07:13,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 583 to 559. [2021-11-25 19:07:13,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 559 states, 558 states have (on average 1.492831541218638) internal successors, (833), 558 states have internal predecessors, (833), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:13,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 559 states to 559 states and 833 transitions. [2021-11-25 19:07:13,084 INFO L78 Accepts]: Start accepts. Automaton has 559 states and 833 transitions. Word has length 136 [2021-11-25 19:07:13,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:13,084 INFO L470 AbstractCegarLoop]: Abstraction has 559 states and 833 transitions. [2021-11-25 19:07:13,085 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:13,085 INFO L276 IsEmpty]: Start isEmpty. Operand 559 states and 833 transitions. [2021-11-25 19:07:13,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 19:07:13,087 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:13,087 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:13,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-11-25 19:07:13,088 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:13,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:13,088 INFO L85 PathProgramCache]: Analyzing trace with hash 1594742274, now seen corresponding path program 1 times [2021-11-25 19:07:13,089 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:13,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743596278] [2021-11-25 19:07:13,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:13,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:13,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:13,265 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 164 proven. 0 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-25 19:07:13,265 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:13,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [743596278] [2021-11-25 19:07:13,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [743596278] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:13,266 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:13,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:07:13,267 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167855918] [2021-11-25 19:07:13,267 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:13,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:07:13,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:13,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:07:13,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:07:13,268 INFO L87 Difference]: Start difference. First operand 559 states and 833 transitions. Second operand has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 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) [2021-11-25 19:07:15,283 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:15,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:15,657 INFO L93 Difference]: Finished difference Result 1128 states and 1683 transitions. [2021-11-25 19:07:15,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:15,658 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 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) Word has length 137 [2021-11-25 19:07:15,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:15,661 INFO L225 Difference]: With dead ends: 1128 [2021-11-25 19:07:15,662 INFO L226 Difference]: Without dead ends: 581 [2021-11-25 19:07:15,666 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 [2021-11-25 19:07:15,668 INFO L933 BasicCegarLoop]: 161 mSDtfsCounter, 49 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 397 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:15,669 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 397 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 228 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:07:15,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 581 states. [2021-11-25 19:07:15,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 581 to 559. [2021-11-25 19:07:15,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 559 states, 558 states have (on average 1.4910394265232976) internal successors, (832), 558 states have internal predecessors, (832), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:15,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 559 states to 559 states and 832 transitions. [2021-11-25 19:07:15,700 INFO L78 Accepts]: Start accepts. Automaton has 559 states and 832 transitions. Word has length 137 [2021-11-25 19:07:15,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:15,701 INFO L470 AbstractCegarLoop]: Abstraction has 559 states and 832 transitions. [2021-11-25 19:07:15,701 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 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) [2021-11-25 19:07:15,702 INFO L276 IsEmpty]: Start isEmpty. Operand 559 states and 832 transitions. [2021-11-25 19:07:15,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-25 19:07:15,705 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:15,705 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:15,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-11-25 19:07:15,706 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:15,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:15,706 INFO L85 PathProgramCache]: Analyzing trace with hash -1266461271, now seen corresponding path program 1 times [2021-11-25 19:07:15,707 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:15,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [471999618] [2021-11-25 19:07:15,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:15,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:15,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:15,892 INFO L134 CoverageAnalysis]: Checked inductivity of 215 backedges. 158 proven. 0 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-25 19:07:15,893 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:15,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [471999618] [2021-11-25 19:07:15,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [471999618] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:15,893 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:15,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:07:15,894 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650068172] [2021-11-25 19:07:15,894 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:15,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:07:15,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:15,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:07:15,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:07:15,895 INFO L87 Difference]: Start difference. First operand 559 states and 832 transitions. Second operand has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 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) [2021-11-25 19:07:17,909 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:18,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:18,284 INFO L93 Difference]: Finished difference Result 1128 states and 1681 transitions. [2021-11-25 19:07:18,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:18,284 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 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 139 [2021-11-25 19:07:18,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:18,287 INFO L225 Difference]: With dead ends: 1128 [2021-11-25 19:07:18,287 INFO L226 Difference]: Without dead ends: 581 [2021-11-25 19:07:18,288 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 [2021-11-25 19:07:18,288 INFO L933 BasicCegarLoop]: 161 mSDtfsCounter, 51 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 397 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:18,288 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 397 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 228 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:07:18,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 581 states. [2021-11-25 19:07:18,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 581 to 559. [2021-11-25 19:07:18,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 559 states, 558 states have (on average 1.489247311827957) internal successors, (831), 558 states have internal predecessors, (831), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:18,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 559 states to 559 states and 831 transitions. [2021-11-25 19:07:18,313 INFO L78 Accepts]: Start accepts. Automaton has 559 states and 831 transitions. Word has length 139 [2021-11-25 19:07:18,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:18,313 INFO L470 AbstractCegarLoop]: Abstraction has 559 states and 831 transitions. [2021-11-25 19:07:18,314 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 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) [2021-11-25 19:07:18,314 INFO L276 IsEmpty]: Start isEmpty. Operand 559 states and 831 transitions. [2021-11-25 19:07:18,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-25 19:07:18,315 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:18,316 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:18,316 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-11-25 19:07:18,316 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:18,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:18,317 INFO L85 PathProgramCache]: Analyzing trace with hash 1001031651, now seen corresponding path program 1 times [2021-11-25 19:07:18,317 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:18,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [396628755] [2021-11-25 19:07:18,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:18,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:18,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:18,528 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 121 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-25 19:07:18,528 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:18,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [396628755] [2021-11-25 19:07:18,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [396628755] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:18,529 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:18,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:07:18,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027116129] [2021-11-25 19:07:18,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:18,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:07:18,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:18,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:07:18,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:07:18,530 INFO L87 Difference]: Start difference. First operand 559 states and 831 transitions. Second operand has 4 states, 4 states have (on average 24.75) internal successors, (99), 4 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) [2021-11-25 19:07:20,539 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:20,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:20,802 INFO L93 Difference]: Finished difference Result 1127 states and 1678 transitions. [2021-11-25 19:07:20,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:20,803 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.75) internal successors, (99), 4 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) Word has length 140 [2021-11-25 19:07:20,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:20,805 INFO L225 Difference]: With dead ends: 1127 [2021-11-25 19:07:20,805 INFO L226 Difference]: Without dead ends: 580 [2021-11-25 19:07:20,806 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 [2021-11-25 19:07:20,806 INFO L933 BasicCegarLoop]: 155 mSDtfsCounter, 9 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 385 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:20,806 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 385 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 149 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2021-11-25 19:07:20,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2021-11-25 19:07:20,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 578. [2021-11-25 19:07:20,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 578 states, 577 states have (on average 1.483535528596187) internal successors, (856), 577 states have internal predecessors, (856), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:20,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 578 states to 578 states and 856 transitions. [2021-11-25 19:07:20,826 INFO L78 Accepts]: Start accepts. Automaton has 578 states and 856 transitions. Word has length 140 [2021-11-25 19:07:20,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:20,826 INFO L470 AbstractCegarLoop]: Abstraction has 578 states and 856 transitions. [2021-11-25 19:07:20,827 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.75) internal successors, (99), 4 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) [2021-11-25 19:07:20,827 INFO L276 IsEmpty]: Start isEmpty. Operand 578 states and 856 transitions. [2021-11-25 19:07:20,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-25 19:07:20,829 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:20,829 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:20,829 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-11-25 19:07:20,829 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:20,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:20,830 INFO L85 PathProgramCache]: Analyzing trace with hash 1278903261, now seen corresponding path program 1 times [2021-11-25 19:07:20,830 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:20,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1729622079] [2021-11-25 19:07:20,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:20,831 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:20,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:20,996 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 160 proven. 0 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-25 19:07:20,996 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:20,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1729622079] [2021-11-25 19:07:20,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1729622079] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:20,997 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:20,997 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:07:20,997 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930619948] [2021-11-25 19:07:20,997 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:20,998 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:07:20,998 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:20,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:07:20,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:07:20,999 INFO L87 Difference]: Start difference. First operand 578 states and 856 transitions. Second operand has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:23,012 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:23,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:23,359 INFO L93 Difference]: Finished difference Result 1158 states and 1716 transitions. [2021-11-25 19:07:23,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:23,360 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 0 states have call successors, (0), 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 140 [2021-11-25 19:07:23,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:23,363 INFO L225 Difference]: With dead ends: 1158 [2021-11-25 19:07:23,363 INFO L226 Difference]: Without dead ends: 592 [2021-11-25 19:07:23,364 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 [2021-11-25 19:07:23,365 INFO L933 BasicCegarLoop]: 170 mSDtfsCounter, 40 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 415 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:23,365 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 415 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 210 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-25 19:07:23,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2021-11-25 19:07:23,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 578. [2021-11-25 19:07:23,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 578 states, 577 states have (on average 1.4818024263431542) internal successors, (855), 577 states have internal predecessors, (855), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:23,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 578 states to 578 states and 855 transitions. [2021-11-25 19:07:23,389 INFO L78 Accepts]: Start accepts. Automaton has 578 states and 855 transitions. Word has length 140 [2021-11-25 19:07:23,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:23,389 INFO L470 AbstractCegarLoop]: Abstraction has 578 states and 855 transitions. [2021-11-25 19:07:23,390 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:23,390 INFO L276 IsEmpty]: Start isEmpty. Operand 578 states and 855 transitions. [2021-11-25 19:07:23,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-25 19:07:23,391 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:23,391 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:23,392 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-11-25 19:07:23,392 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:23,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:23,392 INFO L85 PathProgramCache]: Analyzing trace with hash 1433911808, now seen corresponding path program 1 times [2021-11-25 19:07:23,393 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:23,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1607103159] [2021-11-25 19:07:23,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:23,393 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:23,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:23,552 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 139 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 19:07:23,552 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:23,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1607103159] [2021-11-25 19:07:23,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1607103159] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:23,553 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:23,553 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:07:23,553 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894772166] [2021-11-25 19:07:23,553 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:23,553 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:07:23,553 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:23,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:07:23,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:07:23,554 INFO L87 Difference]: Start difference. First operand 578 states and 855 transitions. Second operand has 4 states, 4 states have (on average 29.25) internal successors, (117), 4 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:25,572 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:25,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:25,993 INFO L93 Difference]: Finished difference Result 1200 states and 1773 transitions. [2021-11-25 19:07:25,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:25,994 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 29.25) internal successors, (117), 4 states have internal predecessors, (117), 0 states have call successors, (0), 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 141 [2021-11-25 19:07:25,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:25,997 INFO L225 Difference]: With dead ends: 1200 [2021-11-25 19:07:25,997 INFO L226 Difference]: Without dead ends: 632 [2021-11-25 19:07:25,998 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 [2021-11-25 19:07:25,998 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 75 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 40 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:25,999 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 270 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 219 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:07:26,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 632 states. [2021-11-25 19:07:26,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 632 to 569. [2021-11-25 19:07:26,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 569 states, 568 states have (on average 1.4859154929577465) internal successors, (844), 568 states have internal predecessors, (844), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:26,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 569 states to 569 states and 844 transitions. [2021-11-25 19:07:26,048 INFO L78 Accepts]: Start accepts. Automaton has 569 states and 844 transitions. Word has length 141 [2021-11-25 19:07:26,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:26,049 INFO L470 AbstractCegarLoop]: Abstraction has 569 states and 844 transitions. [2021-11-25 19:07:26,049 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 29.25) internal successors, (117), 4 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:26,050 INFO L276 IsEmpty]: Start isEmpty. Operand 569 states and 844 transitions. [2021-11-25 19:07:26,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-25 19:07:26,052 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:26,052 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:26,052 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-11-25 19:07:26,052 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:26,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:26,056 INFO L85 PathProgramCache]: Analyzing trace with hash -245826855, now seen corresponding path program 1 times [2021-11-25 19:07:26,057 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:26,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [179742198] [2021-11-25 19:07:26,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:26,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:26,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:26,343 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:07:26,343 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:26,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [179742198] [2021-11-25 19:07:26,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [179742198] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:07:26,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796990861] [2021-11-25 19:07:26,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:26,344 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:07:26,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:07:26,347 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:07:26,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:07:27,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:27,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 1217 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 19:07:27,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:07:28,440 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:07:28,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:07:30,184 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 189 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:07:30,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [796990861] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 19:07:30,185 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:07:30,185 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 6] total 10 [2021-11-25 19:07:30,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260625686] [2021-11-25 19:07:30,186 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:30,186 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:07:30,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:30,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:07:30,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2021-11-25 19:07:30,188 INFO L87 Difference]: Start difference. First operand 569 states and 844 transitions. Second operand has 7 states, 7 states have (on average 21.142857142857142) internal successors, (148), 6 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:32,202 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:32,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:32,645 INFO L93 Difference]: Finished difference Result 2740 states and 4081 transitions. [2021-11-25 19:07:32,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:07:32,646 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 21.142857142857142) internal successors, (148), 6 states have internal predecessors, (148), 0 states have call successors, (0), 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 148 [2021-11-25 19:07:32,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:32,680 INFO L225 Difference]: With dead ends: 2740 [2021-11-25 19:07:32,680 INFO L226 Difference]: Without dead ends: 2183 [2021-11-25 19:07:32,682 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 291 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2021-11-25 19:07:32,683 INFO L933 BasicCegarLoop]: 445 mSDtfsCounter, 624 mSDsluCounter, 518 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 19 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 624 SdHoareTripleChecker+Valid, 930 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:32,683 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [624 Valid, 930 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 111 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-25 19:07:32,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2183 states. [2021-11-25 19:07:32,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2183 to 2125. [2021-11-25 19:07:32,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2125 states, 2124 states have (on average 1.4962335216572504) internal successors, (3178), 2124 states have internal predecessors, (3178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:32,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2125 states to 2125 states and 3178 transitions. [2021-11-25 19:07:32,795 INFO L78 Accepts]: Start accepts. Automaton has 2125 states and 3178 transitions. Word has length 148 [2021-11-25 19:07:32,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:32,796 INFO L470 AbstractCegarLoop]: Abstraction has 2125 states and 3178 transitions. [2021-11-25 19:07:32,796 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 21.142857142857142) internal successors, (148), 6 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:32,797 INFO L276 IsEmpty]: Start isEmpty. Operand 2125 states and 3178 transitions. [2021-11-25 19:07:32,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-25 19:07:32,801 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:32,801 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:32,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:07:33,026 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-25 19:07:33,026 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:33,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:33,027 INFO L85 PathProgramCache]: Analyzing trace with hash 1193499176, now seen corresponding path program 1 times [2021-11-25 19:07:33,027 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:33,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [384478331] [2021-11-25 19:07:33,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:33,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:33,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:33,460 INFO L134 CoverageAnalysis]: Checked inductivity of 244 backedges. 164 proven. 0 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2021-11-25 19:07:33,460 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:33,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [384478331] [2021-11-25 19:07:33,461 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [384478331] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:33,461 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:33,461 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:07:33,461 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681634374] [2021-11-25 19:07:33,462 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:33,462 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:07:33,462 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:33,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:07:33,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:07:33,466 INFO L87 Difference]: Start difference. First operand 2125 states and 3178 transitions. Second operand has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:35,480 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:36,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:36,298 INFO L93 Difference]: Finished difference Result 4309 states and 6427 transitions. [2021-11-25 19:07:36,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:07:36,299 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 0 states have call successors, (0), 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 152 [2021-11-25 19:07:36,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:36,313 INFO L225 Difference]: With dead ends: 4309 [2021-11-25 19:07:36,313 INFO L226 Difference]: Without dead ends: 2196 [2021-11-25 19:07:36,316 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:07:36,316 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 44 mSDsluCounter, 415 mSDsCounter, 0 mSdLazyCounter, 410 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 523 SdHoareTripleChecker+Invalid, 417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 410 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:36,317 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 523 Invalid, 417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 410 Invalid, 1 Unknown, 0 Unchecked, 2.7s Time] [2021-11-25 19:07:36,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2196 states. [2021-11-25 19:07:36,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2196 to 2125. [2021-11-25 19:07:36,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2125 states, 2124 states have (on average 1.4943502824858756) internal successors, (3174), 2124 states have internal predecessors, (3174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:36,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2125 states to 2125 states and 3174 transitions. [2021-11-25 19:07:36,419 INFO L78 Accepts]: Start accepts. Automaton has 2125 states and 3174 transitions. Word has length 152 [2021-11-25 19:07:36,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:36,420 INFO L470 AbstractCegarLoop]: Abstraction has 2125 states and 3174 transitions. [2021-11-25 19:07:36,420 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:36,420 INFO L276 IsEmpty]: Start isEmpty. Operand 2125 states and 3174 transitions. [2021-11-25 19:07:36,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-11-25 19:07:36,425 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:36,425 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:36,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-11-25 19:07:36,425 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:36,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:36,426 INFO L85 PathProgramCache]: Analyzing trace with hash -1962560932, now seen corresponding path program 1 times [2021-11-25 19:07:36,426 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:36,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [344532152] [2021-11-25 19:07:36,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:36,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:37,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:37,309 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 167 proven. 0 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2021-11-25 19:07:37,310 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:37,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [344532152] [2021-11-25 19:07:37,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [344532152] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:37,310 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:37,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:07:37,311 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303134109] [2021-11-25 19:07:37,311 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:37,312 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:07:37,312 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:37,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:07:37,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:07:37,313 INFO L87 Difference]: Start difference. First operand 2125 states and 3174 transitions. Second operand has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:39,335 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:39,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:39,851 INFO L93 Difference]: Finished difference Result 4426 states and 6583 transitions. [2021-11-25 19:07:39,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:39,851 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 153 [2021-11-25 19:07:39,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:39,862 INFO L225 Difference]: With dead ends: 4426 [2021-11-25 19:07:39,863 INFO L226 Difference]: Without dead ends: 2313 [2021-11-25 19:07:39,865 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 [2021-11-25 19:07:39,866 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 89 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 41 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:39,866 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 284 Invalid, 259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 217 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:07:39,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2313 states. [2021-11-25 19:07:39,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2313 to 2125. [2021-11-25 19:07:39,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2125 states, 2124 states have (on average 1.4745762711864407) internal successors, (3132), 2124 states have internal predecessors, (3132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:39,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2125 states to 2125 states and 3132 transitions. [2021-11-25 19:07:39,960 INFO L78 Accepts]: Start accepts. Automaton has 2125 states and 3132 transitions. Word has length 153 [2021-11-25 19:07:39,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:39,960 INFO L470 AbstractCegarLoop]: Abstraction has 2125 states and 3132 transitions. [2021-11-25 19:07:39,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:39,960 INFO L276 IsEmpty]: Start isEmpty. Operand 2125 states and 3132 transitions. [2021-11-25 19:07:39,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-11-25 19:07:39,964 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:39,964 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:39,964 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-11-25 19:07:39,965 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:39,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:39,965 INFO L85 PathProgramCache]: Analyzing trace with hash -1200515554, now seen corresponding path program 1 times [2021-11-25 19:07:39,966 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:39,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070709426] [2021-11-25 19:07:39,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:39,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:40,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:40,199 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 203 proven. 0 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-25 19:07:40,199 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:40,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070709426] [2021-11-25 19:07:40,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1070709426] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:40,200 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:40,200 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:07:40,200 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563531185] [2021-11-25 19:07:40,201 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:40,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:07:40,202 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:40,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:07:40,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:07:40,203 INFO L87 Difference]: Start difference. First operand 2125 states and 3132 transitions. Second operand has 4 states, 4 states have (on average 26.5) internal successors, (106), 4 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:42,218 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:42,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:42,744 INFO L93 Difference]: Finished difference Result 4426 states and 6499 transitions. [2021-11-25 19:07:42,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:42,744 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 26.5) internal successors, (106), 4 states have internal predecessors, (106), 0 states have call successors, (0), 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 155 [2021-11-25 19:07:42,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:42,780 INFO L225 Difference]: With dead ends: 4426 [2021-11-25 19:07:42,780 INFO L226 Difference]: Without dead ends: 2313 [2021-11-25 19:07:42,782 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 [2021-11-25 19:07:42,789 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 85 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 35 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:42,789 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 284 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 220 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:07:42,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2313 states. [2021-11-25 19:07:42,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2313 to 2125. [2021-11-25 19:07:42,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2125 states, 2124 states have (on average 1.4623352165725048) internal successors, (3106), 2124 states have internal predecessors, (3106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:42,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2125 states to 2125 states and 3106 transitions. [2021-11-25 19:07:42,875 INFO L78 Accepts]: Start accepts. Automaton has 2125 states and 3106 transitions. Word has length 155 [2021-11-25 19:07:42,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:42,876 INFO L470 AbstractCegarLoop]: Abstraction has 2125 states and 3106 transitions. [2021-11-25 19:07:42,876 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 26.5) internal successors, (106), 4 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:42,876 INFO L276 IsEmpty]: Start isEmpty. Operand 2125 states and 3106 transitions. [2021-11-25 19:07:42,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-25 19:07:42,879 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:42,879 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:42,880 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-11-25 19:07:42,880 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:42,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:42,880 INFO L85 PathProgramCache]: Analyzing trace with hash 380872698, now seen corresponding path program 1 times [2021-11-25 19:07:42,880 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:42,881 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831855718] [2021-11-25 19:07:42,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:42,881 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:43,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:43,093 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 206 proven. 0 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-25 19:07:43,094 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:43,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831855718] [2021-11-25 19:07:43,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [831855718] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:43,094 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:43,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:07:43,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590024172] [2021-11-25 19:07:43,095 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:43,096 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:07:43,096 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:43,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:07:43,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:07:43,097 INFO L87 Difference]: Start difference. First operand 2125 states and 3106 transitions. Second operand has 4 states, 4 states have (on average 26.75) internal successors, (107), 4 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) [2021-11-25 19:07:45,112 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:45,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:45,629 INFO L93 Difference]: Finished difference Result 4354 states and 6347 transitions. [2021-11-25 19:07:45,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:45,630 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 26.75) internal successors, (107), 4 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 156 [2021-11-25 19:07:45,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:45,644 INFO L225 Difference]: With dead ends: 4354 [2021-11-25 19:07:45,644 INFO L226 Difference]: Without dead ends: 2241 [2021-11-25 19:07:45,647 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 [2021-11-25 19:07:45,647 INFO L933 BasicCegarLoop]: 161 mSDtfsCounter, 50 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 397 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:45,648 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 397 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 230 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:07:45,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2241 states. [2021-11-25 19:07:45,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2241 to 2125. [2021-11-25 19:07:45,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2125 states, 2124 states have (on average 1.46045197740113) internal successors, (3102), 2124 states have internal predecessors, (3102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:45,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2125 states to 2125 states and 3102 transitions. [2021-11-25 19:07:45,715 INFO L78 Accepts]: Start accepts. Automaton has 2125 states and 3102 transitions. Word has length 156 [2021-11-25 19:07:45,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:45,716 INFO L470 AbstractCegarLoop]: Abstraction has 2125 states and 3102 transitions. [2021-11-25 19:07:45,716 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 26.75) internal successors, (107), 4 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) [2021-11-25 19:07:45,716 INFO L276 IsEmpty]: Start isEmpty. Operand 2125 states and 3102 transitions. [2021-11-25 19:07:45,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-25 19:07:45,719 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:45,719 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:45,719 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-11-25 19:07:45,720 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:45,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:45,720 INFO L85 PathProgramCache]: Analyzing trace with hash 435980705, now seen corresponding path program 1 times [2021-11-25 19:07:45,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:45,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [173679487] [2021-11-25 19:07:45,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:45,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:45,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:45,911 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 197 proven. 0 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-25 19:07:45,911 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:45,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [173679487] [2021-11-25 19:07:45,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [173679487] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:45,911 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:45,912 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:07:45,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568612583] [2021-11-25 19:07:45,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:45,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:07:45,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:45,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:07:45,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:07:45,913 INFO L87 Difference]: Start difference. First operand 2125 states and 3102 transitions. Second operand has 4 states, 4 states have (on average 27.25) internal successors, (109), 4 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) [2021-11-25 19:07:47,925 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:48,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:48,433 INFO L93 Difference]: Finished difference Result 4354 states and 6339 transitions. [2021-11-25 19:07:48,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:48,434 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.25) internal successors, (109), 4 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 158 [2021-11-25 19:07:48,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:48,442 INFO L225 Difference]: With dead ends: 4354 [2021-11-25 19:07:48,443 INFO L226 Difference]: Without dead ends: 2241 [2021-11-25 19:07:48,446 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 [2021-11-25 19:07:48,446 INFO L933 BasicCegarLoop]: 161 mSDtfsCounter, 52 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 397 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:48,447 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 397 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 230 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:07:48,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2241 states. [2021-11-25 19:07:48,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2241 to 2125. [2021-11-25 19:07:48,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2125 states, 2124 states have (on average 1.4585687382297552) internal successors, (3098), 2124 states have internal predecessors, (3098), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:48,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2125 states to 2125 states and 3098 transitions. [2021-11-25 19:07:48,572 INFO L78 Accepts]: Start accepts. Automaton has 2125 states and 3098 transitions. Word has length 158 [2021-11-25 19:07:48,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:48,573 INFO L470 AbstractCegarLoop]: Abstraction has 2125 states and 3098 transitions. [2021-11-25 19:07:48,573 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.25) internal successors, (109), 4 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) [2021-11-25 19:07:48,573 INFO L276 IsEmpty]: Start isEmpty. Operand 2125 states and 3098 transitions. [2021-11-25 19:07:48,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-25 19:07:48,578 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:48,578 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:48,578 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-11-25 19:07:48,579 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:48,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:48,580 INFO L85 PathProgramCache]: Analyzing trace with hash -1779970331, now seen corresponding path program 1 times [2021-11-25 19:07:48,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:48,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1791238960] [2021-11-25 19:07:48,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:48,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:48,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:48,815 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 200 proven. 0 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-25 19:07:48,815 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:48,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1791238960] [2021-11-25 19:07:48,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1791238960] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:48,816 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:48,816 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:07:48,816 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57935069] [2021-11-25 19:07:48,816 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:48,817 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:07:48,817 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:48,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:07:48,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:07:48,818 INFO L87 Difference]: Start difference. First operand 2125 states and 3098 transitions. Second operand has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:50,832 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:51,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:51,426 INFO L93 Difference]: Finished difference Result 4426 states and 6431 transitions. [2021-11-25 19:07:51,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:51,426 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 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 159 [2021-11-25 19:07:51,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:51,434 INFO L225 Difference]: With dead ends: 4426 [2021-11-25 19:07:51,434 INFO L226 Difference]: Without dead ends: 2313 [2021-11-25 19:07:51,437 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 [2021-11-25 19:07:51,437 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 86 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 41 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:51,438 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 284 Invalid, 259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 217 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 19:07:51,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2313 states. [2021-11-25 19:07:51,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2313 to 2125. [2021-11-25 19:07:51,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2125 states, 2124 states have (on average 1.4444444444444444) internal successors, (3068), 2124 states have internal predecessors, (3068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:51,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2125 states to 2125 states and 3068 transitions. [2021-11-25 19:07:51,553 INFO L78 Accepts]: Start accepts. Automaton has 2125 states and 3068 transitions. Word has length 159 [2021-11-25 19:07:51,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:51,553 INFO L470 AbstractCegarLoop]: Abstraction has 2125 states and 3068 transitions. [2021-11-25 19:07:51,553 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:51,553 INFO L276 IsEmpty]: Start isEmpty. Operand 2125 states and 3068 transitions. [2021-11-25 19:07:51,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-25 19:07:51,556 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:51,556 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:51,556 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-11-25 19:07:51,556 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:51,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:51,556 INFO L85 PathProgramCache]: Analyzing trace with hash 464449980, now seen corresponding path program 1 times [2021-11-25 19:07:51,557 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:51,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1505256678] [2021-11-25 19:07:51,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:51,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:51,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:51,753 INFO L134 CoverageAnalysis]: Checked inductivity of 274 backedges. 212 proven. 0 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-25 19:07:51,753 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:51,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1505256678] [2021-11-25 19:07:51,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1505256678] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:51,754 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:51,754 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:07:51,755 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483666340] [2021-11-25 19:07:51,755 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:51,755 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:07:51,755 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:51,756 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:07:51,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:07:51,756 INFO L87 Difference]: Start difference. First operand 2125 states and 3068 transitions. Second operand has 4 states, 4 states have (on average 28.75) internal successors, (115), 4 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) [2021-11-25 19:07:53,771 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:54,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:54,285 INFO L93 Difference]: Finished difference Result 3823 states and 5506 transitions. [2021-11-25 19:07:54,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:54,285 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 28.75) internal successors, (115), 4 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 164 [2021-11-25 19:07:54,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:54,292 INFO L225 Difference]: With dead ends: 3823 [2021-11-25 19:07:54,292 INFO L226 Difference]: Without dead ends: 2195 [2021-11-25 19:07:54,295 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 [2021-11-25 19:07:54,296 INFO L933 BasicCegarLoop]: 175 mSDtfsCounter, 50 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 424 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:54,296 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 424 Invalid, 239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 235 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:07:54,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2195 states. [2021-11-25 19:07:54,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2195 to 2125. [2021-11-25 19:07:54,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2125 states, 2124 states have (on average 1.4430320150659133) internal successors, (3065), 2124 states have internal predecessors, (3065), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:54,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2125 states to 2125 states and 3065 transitions. [2021-11-25 19:07:54,395 INFO L78 Accepts]: Start accepts. Automaton has 2125 states and 3065 transitions. Word has length 164 [2021-11-25 19:07:54,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:54,396 INFO L470 AbstractCegarLoop]: Abstraction has 2125 states and 3065 transitions. [2021-11-25 19:07:54,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 28.75) internal successors, (115), 4 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) [2021-11-25 19:07:54,397 INFO L276 IsEmpty]: Start isEmpty. Operand 2125 states and 3065 transitions. [2021-11-25 19:07:54,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-25 19:07:54,400 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:54,401 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 5, 5, 5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:54,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-11-25 19:07:54,401 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:54,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:54,402 INFO L85 PathProgramCache]: Analyzing trace with hash -1288986452, now seen corresponding path program 1 times [2021-11-25 19:07:54,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:54,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [894199882] [2021-11-25 19:07:54,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:54,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:54,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:54,614 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 212 proven. 0 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2021-11-25 19:07:54,614 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:54,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [894199882] [2021-11-25 19:07:54,615 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [894199882] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:54,615 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:54,615 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:07:54,616 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538408378] [2021-11-25 19:07:54,616 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:54,616 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:07:54,616 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:54,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:07:54,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:07:54,618 INFO L87 Difference]: Start difference. First operand 2125 states and 3065 transitions. Second operand has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:56,632 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:56,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:56,998 INFO L93 Difference]: Finished difference Result 4325 states and 6224 transitions. [2021-11-25 19:07:56,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:56,999 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 164 [2021-11-25 19:07:56,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:57,002 INFO L225 Difference]: With dead ends: 4325 [2021-11-25 19:07:57,002 INFO L226 Difference]: Without dead ends: 2212 [2021-11-25 19:07:57,004 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 [2021-11-25 19:07:57,005 INFO L933 BasicCegarLoop]: 168 mSDtfsCounter, 41 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 411 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:57,005 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 411 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 207 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-25 19:07:57,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2212 states. [2021-11-25 19:07:57,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2212 to 2125. [2021-11-25 19:07:57,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2125 states, 2124 states have (on average 1.4411487758945387) internal successors, (3061), 2124 states have internal predecessors, (3061), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:57,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2125 states to 2125 states and 3061 transitions. [2021-11-25 19:07:57,063 INFO L78 Accepts]: Start accepts. Automaton has 2125 states and 3061 transitions. Word has length 164 [2021-11-25 19:07:57,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:57,064 INFO L470 AbstractCegarLoop]: Abstraction has 2125 states and 3061 transitions. [2021-11-25 19:07:57,064 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:57,064 INFO L276 IsEmpty]: Start isEmpty. Operand 2125 states and 3061 transitions. [2021-11-25 19:07:57,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2021-11-25 19:07:57,067 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:57,067 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:57,068 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-11-25 19:07:57,068 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:57,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:57,068 INFO L85 PathProgramCache]: Analyzing trace with hash 692984325, now seen corresponding path program 1 times [2021-11-25 19:07:57,068 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:57,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917286826] [2021-11-25 19:07:57,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:57,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:57,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:57,287 INFO L134 CoverageAnalysis]: Checked inductivity of 284 backedges. 185 proven. 0 refuted. 0 times theorem prover too weak. 99 trivial. 0 not checked. [2021-11-25 19:07:57,288 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:57,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [917286826] [2021-11-25 19:07:57,288 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [917286826] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:57,288 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:57,288 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 19:07:57,289 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899424440] [2021-11-25 19:07:57,289 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:57,289 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:07:57,289 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:57,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:07:57,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:07:57,290 INFO L87 Difference]: Start difference. First operand 2125 states and 3061 transitions. Second operand has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:59,302 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:07:59,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:59,891 INFO L93 Difference]: Finished difference Result 4578 states and 6580 transitions. [2021-11-25 19:07:59,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:59,892 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 165 [2021-11-25 19:07:59,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:59,895 INFO L225 Difference]: With dead ends: 4578 [2021-11-25 19:07:59,895 INFO L226 Difference]: Without dead ends: 2465 [2021-11-25 19:07:59,898 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:07:59,898 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 106 mSDsluCounter, 273 mSDsCounter, 0 mSdLazyCounter, 284 mSolverCounterSat, 41 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 362 SdHoareTripleChecker+Invalid, 326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 284 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:59,899 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 362 Invalid, 326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 284 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 19:07:59,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2465 states. [2021-11-25 19:07:59,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2465 to 2249. [2021-11-25 19:07:59,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2249 states, 2248 states have (on average 1.4350533807829182) internal successors, (3226), 2248 states have internal predecessors, (3226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:59,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2249 states to 2249 states and 3226 transitions. [2021-11-25 19:07:59,974 INFO L78 Accepts]: Start accepts. Automaton has 2249 states and 3226 transitions. Word has length 165 [2021-11-25 19:07:59,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:59,975 INFO L470 AbstractCegarLoop]: Abstraction has 2249 states and 3226 transitions. [2021-11-25 19:07:59,975 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:59,975 INFO L276 IsEmpty]: Start isEmpty. Operand 2249 states and 3226 transitions. [2021-11-25 19:07:59,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-11-25 19:07:59,979 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:59,979 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:59,979 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2021-11-25 19:07:59,979 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:59,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:59,980 INFO L85 PathProgramCache]: Analyzing trace with hash 2006762038, now seen corresponding path program 1 times [2021-11-25 19:07:59,980 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:59,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769697218] [2021-11-25 19:07:59,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:59,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:08:00,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:08:00,221 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 188 proven. 0 refuted. 0 times theorem prover too weak. 99 trivial. 0 not checked. [2021-11-25 19:08:00,221 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:08:00,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1769697218] [2021-11-25 19:08:00,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1769697218] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:08:00,222 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:08:00,222 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:08:00,222 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96954648] [2021-11-25 19:08:00,223 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:08:00,223 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:08:00,223 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:08:00,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:08:00,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:08:00,224 INFO L87 Difference]: Start difference. First operand 2249 states and 3226 transitions. Second operand has 4 states, 4 states have (on average 24.75) internal successors, (99), 4 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) [2021-11-25 19:08:02,235 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:08:02,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:08:02,758 INFO L93 Difference]: Finished difference Result 4674 states and 6687 transitions. [2021-11-25 19:08:02,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:08:02,759 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.75) internal successors, (99), 4 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) Word has length 166 [2021-11-25 19:08:02,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:08:02,765 INFO L225 Difference]: With dead ends: 4674 [2021-11-25 19:08:02,765 INFO L226 Difference]: Without dead ends: 2437 [2021-11-25 19:08:02,769 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 [2021-11-25 19:08:02,769 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 80 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 39 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:08:02,770 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 296 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 217 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:08:02,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2437 states. [2021-11-25 19:08:02,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2437 to 2228. [2021-11-25 19:08:02,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2228 states, 2227 states have (on average 1.4288280197575214) internal successors, (3182), 2227 states have internal predecessors, (3182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:08:02,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2228 states to 2228 states and 3182 transitions. [2021-11-25 19:08:02,870 INFO L78 Accepts]: Start accepts. Automaton has 2228 states and 3182 transitions. Word has length 166 [2021-11-25 19:08:02,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:08:02,871 INFO L470 AbstractCegarLoop]: Abstraction has 2228 states and 3182 transitions. [2021-11-25 19:08:02,871 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.75) internal successors, (99), 4 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) [2021-11-25 19:08:02,871 INFO L276 IsEmpty]: Start isEmpty. Operand 2228 states and 3182 transitions. [2021-11-25 19:08:02,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-11-25 19:08:02,875 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:08:02,875 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:08:02,875 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-11-25 19:08:02,876 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:08:02,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:08:02,876 INFO L85 PathProgramCache]: Analyzing trace with hash -850629917, now seen corresponding path program 1 times [2021-11-25 19:08:02,877 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:08:02,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834153281] [2021-11-25 19:08:02,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:08:02,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:08:02,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:08:03,084 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 203 proven. 0 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-25 19:08:03,085 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:08:03,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834153281] [2021-11-25 19:08:03,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1834153281] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:08:03,085 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:08:03,086 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:08:03,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553278121] [2021-11-25 19:08:03,086 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:08:03,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:08:03,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:08:03,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:08:03,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:08:03,087 INFO L87 Difference]: Start difference. First operand 2228 states and 3182 transitions. Second operand has 4 states, 4 states have (on average 29.25) internal successors, (117), 4 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:08:05,099 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:08:05,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:08:05,504 INFO L93 Difference]: Finished difference Result 3983 states and 5665 transitions. [2021-11-25 19:08:05,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:08:05,504 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 29.25) internal successors, (117), 4 states have internal predecessors, (117), 0 states have call successors, (0), 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 166 [2021-11-25 19:08:05,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:08:05,509 INFO L225 Difference]: With dead ends: 3983 [2021-11-25 19:08:05,509 INFO L226 Difference]: Without dead ends: 2262 [2021-11-25 19:08:05,511 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 [2021-11-25 19:08:05,512 INFO L933 BasicCegarLoop]: 165 mSDtfsCounter, 38 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 404 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:08:05,512 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 404 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 207 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-25 19:08:05,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2262 states. [2021-11-25 19:08:05,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2262 to 2228. [2021-11-25 19:08:05,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2228 states, 2227 states have (on average 1.4274809160305344) internal successors, (3179), 2227 states have internal predecessors, (3179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:08:05,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2228 states to 2228 states and 3179 transitions. [2021-11-25 19:08:05,613 INFO L78 Accepts]: Start accepts. Automaton has 2228 states and 3179 transitions. Word has length 166 [2021-11-25 19:08:05,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:08:05,614 INFO L470 AbstractCegarLoop]: Abstraction has 2228 states and 3179 transitions. [2021-11-25 19:08:05,614 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 29.25) internal successors, (117), 4 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:08:05,614 INFO L276 IsEmpty]: Start isEmpty. Operand 2228 states and 3179 transitions. [2021-11-25 19:08:05,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-11-25 19:08:05,617 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:08:05,617 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:08:05,617 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-11-25 19:08:05,618 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:08:05,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:08:05,618 INFO L85 PathProgramCache]: Analyzing trace with hash -999297436, now seen corresponding path program 1 times [2021-11-25 19:08:05,618 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:08:05,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [17787504] [2021-11-25 19:08:05,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:08:05,619 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:08:09,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:08:10,332 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-11-25 19:08:10,332 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:08:10,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [17787504] [2021-11-25 19:08:10,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [17787504] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:08:10,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [981325251] [2021-11-25 19:08:10,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:08:10,334 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:08:10,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:08:10,338 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:08:10,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b0c603-cad2-48e5-ad86-fa7d53bc408c/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:08:12,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:08:12,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 1349 conjuncts, 211 conjunts are in the unsatisfiable core [2021-11-25 19:08:12,751 INFO L286 TraceCheckSpWp]: Computing forward predicates...