./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/openssl/s3_srvr.blast.11.i.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/openssl/s3_srvr.blast.11.i.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d2558e20908ca51bd715f698f032e0721784debd5f3c1dc69de7f261de8133a0 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:00:15,908 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:00:15,911 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:00:15,955 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:00:15,956 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:00:15,961 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:00:15,963 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:00:15,967 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:00:15,970 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:00:15,976 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:00:15,977 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:00:15,979 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:00:15,980 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:00:15,983 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:00:15,985 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:00:15,990 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:00:15,992 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:00:15,993 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:00:15,996 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:00:16,003 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:00:16,005 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:00:16,007 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:00:16,011 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:00:16,012 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:00:16,021 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:00:16,022 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:00:16,022 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:00:16,024 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:00:16,025 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:00:16,026 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:00:16,027 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:00:16,028 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:00:16,030 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:00:16,032 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:00:16,033 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:00:16,034 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:00:16,034 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:00:16,035 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:00:16,035 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:00:16,036 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:00:16,037 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:00:16,038 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:00:16,089 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:00:16,089 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:00:16,090 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:00:16,090 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:00:16,091 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:00:16,097 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:00:16,098 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:00:16,098 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:00:16,098 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:00:16,098 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:00:16,100 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:00:16,100 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:00:16,100 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:00:16,100 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:00:16,101 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:00:16,101 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:00:16,101 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:00:16,101 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:00:16,102 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:00:16,102 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:00:16,103 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:00:16,103 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:00:16,103 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:00:16,103 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:00:16,103 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:00:16,104 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:00:16,105 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:00:16,106 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:00:16,106 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:00:16,106 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:00:16,107 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:00:16,107 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:00:16,107 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:00:16,108 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:00:16,108 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:00:16,108 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:00:16,108 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:00:16,108 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:00:16,109 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:00:16,109 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:00:16,109 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:00:16,109 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_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d2558e20908ca51bd715f698f032e0721784debd5f3c1dc69de7f261de8133a0 [2021-11-21 00:00:16,369 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:00:16,391 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:00:16,393 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:00:16,395 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:00:16,396 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:00:16,397 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/openssl/s3_srvr.blast.11.i.cil-2.c [2021-11-21 00:00:16,477 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/data/5d2860a20/f02e27308e5441db8ba2a019190fe807/FLAG7b8888e29 [2021-11-21 00:00:17,114 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:00:17,115 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/sv-benchmarks/c/openssl/s3_srvr.blast.11.i.cil-2.c [2021-11-21 00:00:17,140 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/data/5d2860a20/f02e27308e5441db8ba2a019190fe807/FLAG7b8888e29 [2021-11-21 00:00:17,362 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/data/5d2860a20/f02e27308e5441db8ba2a019190fe807 [2021-11-21 00:00:17,366 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:00:17,369 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:00:17,373 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:00:17,374 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:00:17,378 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:00:17,379 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:00:17" (1/1) ... [2021-11-21 00:00:17,381 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4afe0501 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:00:17, skipping insertion in model container [2021-11-21 00:00:17,381 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:00:17" (1/1) ... [2021-11-21 00:00:17,391 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:00:17,489 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:00:18,007 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_06120594-a61b-4afc-86ee-64c2a48b820f/sv-benchmarks/c/openssl/s3_srvr.blast.11.i.cil-2.c[74369,74382] [2021-11-21 00:00:18,022 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:00:18,036 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:00:18,172 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_06120594-a61b-4afc-86ee-64c2a48b820f/sv-benchmarks/c/openssl/s3_srvr.blast.11.i.cil-2.c[74369,74382] [2021-11-21 00:00:18,176 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:00:18,195 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:00:18,196 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:00:18 WrapperNode [2021-11-21 00:00:18,196 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:00:18,197 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:00:18,197 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:00:18,197 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:00:18,206 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:00:18" (1/1) ... [2021-11-21 00:00:18,232 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:00:18" (1/1) ... [2021-11-21 00:00:18,291 INFO L137 Inliner]: procedures = 31, calls = 223, calls flagged for inlining = 7, calls inlined = 3, statements flattened = 792 [2021-11-21 00:00:18,292 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:00:18,293 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:00:18,293 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:00:18,293 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:00:18,311 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:00:18" (1/1) ... [2021-11-21 00:00:18,312 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:00:18" (1/1) ... [2021-11-21 00:00:18,325 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:00:18" (1/1) ... [2021-11-21 00:00:18,325 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:00:18" (1/1) ... [2021-11-21 00:00:18,444 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:00:18" (1/1) ... [2021-11-21 00:00:18,452 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:00:18" (1/1) ... [2021-11-21 00:00:18,455 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:00:18" (1/1) ... [2021-11-21 00:00:18,461 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:00:18,462 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:00:18,462 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:00:18,463 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:00:18,464 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:00:18" (1/1) ... [2021-11-21 00:00:18,472 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:00:18,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:00:18,500 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:00:18,520 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:00:18,551 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:00:18,551 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-21 00:00:18,552 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 00:00:18,552 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 00:00:18,552 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-21 00:00:18,552 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:00:18,552 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-21 00:00:18,553 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:00:18,553 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:00:18,770 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:00:18,772 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:00:18,793 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-21 00:00:21,718 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##90: assume false; [2021-11-21 00:00:21,718 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##91: assume !false; [2021-11-21 00:00:21,718 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:00:22,167 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:00:22,168 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-21 00:00:22,174 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:00:22 BoogieIcfgContainer [2021-11-21 00:00:22,174 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:00:22,177 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:00:22,177 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:00:22,180 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:00:22,181 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:00:17" (1/3) ... [2021-11-21 00:00:22,182 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ad0f554 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:00:22, skipping insertion in model container [2021-11-21 00:00:22,182 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:00:18" (2/3) ... [2021-11-21 00:00:22,183 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ad0f554 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:00:22, skipping insertion in model container [2021-11-21 00:00:22,183 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:00:22" (3/3) ... [2021-11-21 00:00:22,185 INFO L111 eAbstractionObserver]: Analyzing ICFG s3_srvr.blast.11.i.cil-2.c [2021-11-21 00:00:22,192 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:00:22,193 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:00:22,258 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:00:22,276 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 00:00:22,283 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:00:22,306 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) [2021-11-21 00:00:22,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-21 00:00:22,315 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:00:22,315 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] [2021-11-21 00:00:22,316 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:00:22,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:00:22,323 INFO L85 PathProgramCache]: Analyzing trace with hash -1595791018, now seen corresponding path program 1 times [2021-11-21 00:00:22,331 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:00:22,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [365654915] [2021-11-21 00:00:22,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:00:22,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:00:22,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:00:22,736 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:00:22,737 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:00:22,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [365654915] [2021-11-21 00:00:22,739 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [365654915] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:00:22,740 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:00:22,740 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:00:22,742 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443192681] [2021-11-21 00:00:22,743 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:00:22,748 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:00:22,748 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:00:22,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:00:22,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:00:22,789 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 7.25) internal successors, (29), 3 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:24,822 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:00:25,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:00:25,485 INFO L93 Difference]: Finished difference Result 243 states and 420 transitions. [2021-11-21 00:00:25,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:00:25,493 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 3 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-21 00:00:25,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:00:25,504 INFO L225 Difference]: With dead ends: 243 [2021-11-21 00:00:25,504 INFO L226 Difference]: Without dead ends: 129 [2021-11-21 00:00:25,506 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 [2021-11-21 00:00:25,509 INFO L933 BasicCegarLoop]: 150 mSDtfsCounter, 20 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 396 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:00:25,510 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 396 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 163 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2021-11-21 00:00:25,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-21 00:00:25,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 117. [2021-11-21 00:00:25,554 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) [2021-11-21 00:00:25,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 179 transitions. [2021-11-21 00:00:25,560 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 179 transitions. Word has length 29 [2021-11-21 00:00:25,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:00:25,561 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 179 transitions. [2021-11-21 00:00:25,561 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 3 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:25,562 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 179 transitions. [2021-11-21 00:00:25,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-21 00:00:25,566 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:00:25,567 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] [2021-11-21 00:00:25,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:00:25,568 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:00:25,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:00:25,570 INFO L85 PathProgramCache]: Analyzing trace with hash 1717730437, now seen corresponding path program 1 times [2021-11-21 00:00:25,570 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:00:25,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550975256] [2021-11-21 00:00:25,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:00:25,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:00:25,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:00:25,721 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:00:25,721 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:00:25,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550975256] [2021-11-21 00:00:25,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1550975256] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:00:25,724 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:00:25,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:00:25,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628929924] [2021-11-21 00:00:25,725 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:00:25,730 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:00:25,730 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:00:25,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:00:25,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:00:25,732 INFO L87 Difference]: Start difference. First operand 117 states and 179 transitions. Second operand has 4 states, 4 states have (on average 9.75) internal successors, (39), 3 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:27,747 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:00:28,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:00:28,224 INFO L93 Difference]: Finished difference Result 234 states and 352 transitions. [2021-11-21 00:00:28,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:00:28,226 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 3 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-21 00:00:28,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:00:28,229 INFO L225 Difference]: With dead ends: 234 [2021-11-21 00:00:28,229 INFO L226 Difference]: Without dead ends: 129 [2021-11-21 00:00:28,230 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 [2021-11-21 00:00:28,232 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 19 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:00:28,233 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 328 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 151 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-21 00:00:28,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-21 00:00:28,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 117. [2021-11-21 00:00:28,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.5344827586206897) internal successors, (178), 116 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:28,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 178 transitions. [2021-11-21 00:00:28,248 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 178 transitions. Word has length 39 [2021-11-21 00:00:28,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:00:28,249 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 178 transitions. [2021-11-21 00:00:28,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 3 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:28,249 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 178 transitions. [2021-11-21 00:00:28,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-21 00:00:28,251 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:00:28,252 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] [2021-11-21 00:00:28,252 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 00:00:28,252 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:00:28,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:00:28,253 INFO L85 PathProgramCache]: Analyzing trace with hash -57164581, now seen corresponding path program 1 times [2021-11-21 00:00:28,254 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:00:28,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421829878] [2021-11-21 00:00:28,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:00:28,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:00:28,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:00:28,391 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:00:28,392 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:00:28,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421829878] [2021-11-21 00:00:28,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421829878] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:00:28,393 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:00:28,393 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:00:28,393 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007283413] [2021-11-21 00:00:28,394 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:00:28,394 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:00:28,395 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:00:28,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:00:28,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:00:28,398 INFO L87 Difference]: Start difference. First operand 117 states and 178 transitions. Second operand has 4 states, 4 states have (on average 10.0) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:30,409 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:00:30,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:00:30,778 INFO L93 Difference]: Finished difference Result 234 states and 351 transitions. [2021-11-21 00:00:30,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:00:30,779 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.0) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-21 00:00:30,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:00:30,781 INFO L225 Difference]: With dead ends: 234 [2021-11-21 00:00:30,781 INFO L226 Difference]: Without dead ends: 129 [2021-11-21 00:00:30,782 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 [2021-11-21 00:00:30,784 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 17 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 327 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 [2021-11-21 00:00:30,785 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 327 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 152 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-21 00:00:30,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-21 00:00:30,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 117. [2021-11-21 00:00:30,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.5258620689655173) internal successors, (177), 116 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:30,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 177 transitions. [2021-11-21 00:00:30,800 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 177 transitions. Word has length 40 [2021-11-21 00:00:30,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:00:30,801 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 177 transitions. [2021-11-21 00:00:30,801 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.0) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:30,802 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 177 transitions. [2021-11-21 00:00:30,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-21 00:00:30,804 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:00:30,804 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] [2021-11-21 00:00:30,804 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 00:00:30,805 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:00:30,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:00:30,806 INFO L85 PathProgramCache]: Analyzing trace with hash 1218895093, now seen corresponding path program 1 times [2021-11-21 00:00:30,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:00:30,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [779510562] [2021-11-21 00:00:30,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:00:30,807 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:00:30,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:00:30,891 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:00:30,891 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:00:30,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [779510562] [2021-11-21 00:00:30,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [779510562] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:00:30,892 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:00:30,892 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:00:30,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423364727] [2021-11-21 00:00:30,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:00:30,893 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:00:30,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:00:30,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:00:30,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:00:30,895 INFO L87 Difference]: Start difference. First operand 117 states and 177 transitions. Second operand has 4 states, 4 states have (on average 10.25) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:32,913 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:00:33,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:00:33,342 INFO L93 Difference]: Finished difference Result 234 states and 350 transitions. [2021-11-21 00:00:33,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:00:33,344 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.25) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-21 00:00:33,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:00:33,346 INFO L225 Difference]: With dead ends: 234 [2021-11-21 00:00:33,346 INFO L226 Difference]: Without dead ends: 129 [2021-11-21 00:00:33,346 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 [2021-11-21 00:00:33,348 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 15 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 327 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 [2021-11-21 00:00:33,348 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 327 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 152 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-21 00:00:33,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-21 00:00:33,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 117. [2021-11-21 00:00:33,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.5172413793103448) internal successors, (176), 116 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:33,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 176 transitions. [2021-11-21 00:00:33,360 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 176 transitions. Word has length 41 [2021-11-21 00:00:33,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:00:33,361 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 176 transitions. [2021-11-21 00:00:33,361 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.25) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:33,361 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 176 transitions. [2021-11-21 00:00:33,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-21 00:00:33,363 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:00:33,363 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] [2021-11-21 00:00:33,364 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 00:00:33,364 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:00:33,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:00:33,365 INFO L85 PathProgramCache]: Analyzing trace with hash 1001209601, now seen corresponding path program 1 times [2021-11-21 00:00:33,365 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:00:33,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685591885] [2021-11-21 00:00:33,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:00:33,366 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:00:33,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:00:33,451 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:00:33,451 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:00:33,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685591885] [2021-11-21 00:00:33,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [685591885] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:00:33,452 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:00:33,452 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:00:33,453 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98691128] [2021-11-21 00:00:33,453 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:00:33,453 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:00:33,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:00:33,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:00:33,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:00:33,455 INFO L87 Difference]: Start difference. First operand 117 states and 176 transitions. Second operand has 4 states, 4 states have (on average 10.25) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:35,467 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:00:35,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:00:35,832 INFO L93 Difference]: Finished difference Result 234 states and 349 transitions. [2021-11-21 00:00:35,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:00:35,833 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.25) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-21 00:00:35,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:00:35,835 INFO L225 Difference]: With dead ends: 234 [2021-11-21 00:00:35,835 INFO L226 Difference]: Without dead ends: 129 [2021-11-21 00:00:35,836 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 [2021-11-21 00:00:35,837 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 11 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 327 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 [2021-11-21 00:00:35,838 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 327 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 152 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-21 00:00:35,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-21 00:00:35,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 117. [2021-11-21 00:00:35,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.5086206896551724) internal successors, (175), 116 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:35,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 175 transitions. [2021-11-21 00:00:35,849 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 175 transitions. Word has length 41 [2021-11-21 00:00:35,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:00:35,850 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 175 transitions. [2021-11-21 00:00:35,850 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.25) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:35,850 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 175 transitions. [2021-11-21 00:00:35,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-21 00:00:35,852 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:00:35,853 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] [2021-11-21 00:00:35,853 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-21 00:00:35,853 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:00:35,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:00:35,854 INFO L85 PathProgramCache]: Analyzing trace with hash 1097925581, now seen corresponding path program 1 times [2021-11-21 00:00:35,854 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:00:35,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692834932] [2021-11-21 00:00:35,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:00:35,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:00:35,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:00:35,930 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:00:35,931 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:00:35,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692834932] [2021-11-21 00:00:35,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1692834932] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:00:35,932 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:00:35,932 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:00:35,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119608496] [2021-11-21 00:00:35,932 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:00:35,933 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:00:35,933 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:00:35,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:00:35,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:00:35,934 INFO L87 Difference]: Start difference. First operand 117 states and 175 transitions. Second operand has 4 states, 4 states have (on average 10.25) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:37,947 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:00:38,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:00:38,297 INFO L93 Difference]: Finished difference Result 234 states and 348 transitions. [2021-11-21 00:00:38,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:00:38,306 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.25) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-21 00:00:38,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:00:38,307 INFO L225 Difference]: With dead ends: 234 [2021-11-21 00:00:38,307 INFO L226 Difference]: Without dead ends: 129 [2021-11-21 00:00:38,307 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 [2021-11-21 00:00:38,308 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 9 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:00:38,309 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 328 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 151 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 00:00:38,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-21 00:00:38,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 117. [2021-11-21 00:00:38,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.5) internal successors, (174), 116 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:38,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 174 transitions. [2021-11-21 00:00:38,318 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 174 transitions. Word has length 41 [2021-11-21 00:00:38,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:00:38,318 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 174 transitions. [2021-11-21 00:00:38,319 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.25) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:38,319 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 174 transitions. [2021-11-21 00:00:38,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-21 00:00:38,321 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:00:38,321 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] [2021-11-21 00:00:38,321 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-21 00:00:38,322 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:00:38,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:00:38,322 INFO L85 PathProgramCache]: Analyzing trace with hash 1607433063, now seen corresponding path program 1 times [2021-11-21 00:00:38,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:00:38,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803400687] [2021-11-21 00:00:38,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:00:38,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:00:38,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:00:38,411 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:00:38,411 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:00:38,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803400687] [2021-11-21 00:00:38,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1803400687] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:00:38,412 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:00:38,412 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:00:38,412 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328095204] [2021-11-21 00:00:38,413 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:00:38,413 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:00:38,413 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:00:38,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:00:38,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:00:38,414 INFO L87 Difference]: Start difference. First operand 117 states and 174 transitions. Second operand has 4 states, 4 states have (on average 10.5) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:40,428 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:00:40,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:00:40,730 INFO L93 Difference]: Finished difference Result 232 states and 345 transitions. [2021-11-21 00:00:40,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:00:40,732 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-21 00:00:40,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:00:40,733 INFO L225 Difference]: With dead ends: 232 [2021-11-21 00:00:40,733 INFO L226 Difference]: Without dead ends: 127 [2021-11-21 00:00:40,733 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 [2021-11-21 00:00:40,734 INFO L933 BasicCegarLoop]: 129 mSDtfsCounter, 9 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 331 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:00:40,734 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 331 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 148 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 00:00:40,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-21 00:00:40,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 117. [2021-11-21 00:00:40,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.4913793103448276) internal successors, (173), 116 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:40,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 173 transitions. [2021-11-21 00:00:40,742 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 173 transitions. Word has length 42 [2021-11-21 00:00:40,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:00:40,743 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 173 transitions. [2021-11-21 00:00:40,743 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:40,743 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 173 transitions. [2021-11-21 00:00:40,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-21 00:00:40,748 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:00:40,748 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] [2021-11-21 00:00:40,748 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-21 00:00:40,748 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:00:40,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:00:40,749 INFO L85 PathProgramCache]: Analyzing trace with hash -1011361290, now seen corresponding path program 1 times [2021-11-21 00:00:40,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:00:40,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824434819] [2021-11-21 00:00:40,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:00:40,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:00:40,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:00:40,822 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:00:40,822 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:00:40,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824434819] [2021-11-21 00:00:40,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [824434819] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:00:40,823 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:00:40,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:00:40,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72970642] [2021-11-21 00:00:40,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:00:40,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:00:40,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:00:40,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:00:40,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:00:40,825 INFO L87 Difference]: Start difference. First operand 117 states and 173 transitions. Second operand has 4 states, 4 states have (on average 10.5) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:42,837 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:00:43,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:00:43,117 INFO L93 Difference]: Finished difference Result 232 states and 344 transitions. [2021-11-21 00:00:43,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:00:43,118 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-21 00:00:43,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:00:43,119 INFO L225 Difference]: With dead ends: 232 [2021-11-21 00:00:43,119 INFO L226 Difference]: Without dead ends: 127 [2021-11-21 00:00:43,120 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 [2021-11-21 00:00:43,121 INFO L933 BasicCegarLoop]: 129 mSDtfsCounter, 11 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 331 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:00:43,121 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 331 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 148 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 00:00:43,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-21 00:00:43,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 117. [2021-11-21 00:00:43,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.4827586206896552) internal successors, (172), 116 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:43,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 172 transitions. [2021-11-21 00:00:43,127 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 172 transitions. Word has length 42 [2021-11-21 00:00:43,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:00:43,128 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 172 transitions. [2021-11-21 00:00:43,128 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:43,128 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 172 transitions. [2021-11-21 00:00:43,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-21 00:00:43,129 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:00:43,130 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] [2021-11-21 00:00:43,130 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-21 00:00:43,130 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:00:43,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:00:43,131 INFO L85 PathProgramCache]: Analyzing trace with hash -268265744, now seen corresponding path program 1 times [2021-11-21 00:00:43,131 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:00:43,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [95403707] [2021-11-21 00:00:43,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:00:43,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:00:43,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:00:43,240 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:00:43,240 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:00:43,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [95403707] [2021-11-21 00:00:43,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [95403707] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:00:43,240 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:00:43,241 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:00:43,241 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789233929] [2021-11-21 00:00:43,241 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:00:43,241 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:00:43,242 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:00:43,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:00:43,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:00:43,242 INFO L87 Difference]: Start difference. First operand 117 states and 172 transitions. Second operand has 4 states, 4 states have (on average 10.75) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:45,254 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:00:45,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:00:45,519 INFO L93 Difference]: Finished difference Result 224 states and 333 transitions. [2021-11-21 00:00:45,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:00:45,520 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-21 00:00:45,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:00:45,521 INFO L225 Difference]: With dead ends: 224 [2021-11-21 00:00:45,521 INFO L226 Difference]: Without dead ends: 119 [2021-11-21 00:00:45,522 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 [2021-11-21 00:00:45,525 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 5 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:00:45,525 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 341 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 138 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 00:00:45,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-21 00:00:45,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 117. [2021-11-21 00:00:45,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.4741379310344827) internal successors, (171), 116 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:45,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 171 transitions. [2021-11-21 00:00:45,531 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 171 transitions. Word has length 43 [2021-11-21 00:00:45,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:00:45,531 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 171 transitions. [2021-11-21 00:00:45,531 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:45,532 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 171 transitions. [2021-11-21 00:00:45,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-21 00:00:45,533 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:00:45,533 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] [2021-11-21 00:00:45,533 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-21 00:00:45,534 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:00:45,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:00:45,534 INFO L85 PathProgramCache]: Analyzing trace with hash 592067863, now seen corresponding path program 1 times [2021-11-21 00:00:45,534 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:00:45,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690333431] [2021-11-21 00:00:45,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:00:45,535 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:00:45,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:00:45,625 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:00:45,625 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:00:45,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [690333431] [2021-11-21 00:00:45,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [690333431] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:00:45,626 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:00:45,626 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:00:45,626 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442660659] [2021-11-21 00:00:45,626 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:00:45,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:00:45,627 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:00:45,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:00:45,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:00:45,627 INFO L87 Difference]: Start difference. First operand 117 states and 171 transitions. Second operand has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:47,640 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:00:47,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:00:47,980 INFO L93 Difference]: Finished difference Result 256 states and 381 transitions. [2021-11-21 00:00:47,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:00:47,982 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-21 00:00:47,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:00:47,983 INFO L225 Difference]: With dead ends: 256 [2021-11-21 00:00:47,983 INFO L226 Difference]: Without dead ends: 151 [2021-11-21 00:00:47,984 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 [2021-11-21 00:00:47,984 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 21 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 9 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 336 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:00:47,985 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 336 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 167 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 00:00:47,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-11-21 00:00:47,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 137. [2021-11-21 00:00:47,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 136 states have (on average 1.5073529411764706) internal successors, (205), 136 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:47,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 205 transitions. [2021-11-21 00:00:47,991 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 205 transitions. Word has length 44 [2021-11-21 00:00:47,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:00:47,991 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 205 transitions. [2021-11-21 00:00:47,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:47,991 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 205 transitions. [2021-11-21 00:00:47,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-21 00:00:47,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:00:47,992 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:00:47,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-21 00:00:47,993 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:00:47,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:00:47,993 INFO L85 PathProgramCache]: Analyzing trace with hash 1081709318, now seen corresponding path program 1 times [2021-11-21 00:00:47,994 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:00:47,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [297136211] [2021-11-21 00:00:47,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:00:47,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:00:48,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:00:48,059 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:00:48,060 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:00:48,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [297136211] [2021-11-21 00:00:48,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [297136211] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:00:48,060 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:00:48,060 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:00:48,061 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144993856] [2021-11-21 00:00:48,061 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:00:48,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:00:48,061 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:00:48,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:00:48,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:00:48,062 INFO L87 Difference]: Start difference. First operand 137 states and 205 transitions. Second operand has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:50,073 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:00:50,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:00:50,412 INFO L93 Difference]: Finished difference Result 276 states and 414 transitions. [2021-11-21 00:00:50,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:00:50,414 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-21 00:00:50,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:00:50,415 INFO L225 Difference]: With dead ends: 276 [2021-11-21 00:00:50,415 INFO L226 Difference]: Without dead ends: 151 [2021-11-21 00:00:50,416 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 [2021-11-21 00:00:50,416 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 32 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:00:50,417 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 338 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 164 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 00:00:50,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-11-21 00:00:50,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 137. [2021-11-21 00:00:50,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 136 states have (on average 1.5) internal successors, (204), 136 states have internal predecessors, (204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:50,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 204 transitions. [2021-11-21 00:00:50,423 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 204 transitions. Word has length 54 [2021-11-21 00:00:50,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:00:50,423 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 204 transitions. [2021-11-21 00:00:50,423 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:50,424 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 204 transitions. [2021-11-21 00:00:50,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-21 00:00:50,424 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:00:50,425 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1] [2021-11-21 00:00:50,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-21 00:00:50,425 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:00:50,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:00:50,426 INFO L85 PathProgramCache]: Analyzing trace with hash 1701017210, now seen corresponding path program 1 times [2021-11-21 00:00:50,426 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:00:50,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337655323] [2021-11-21 00:00:50,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:00:50,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:00:50,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:00:50,521 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:00:50,521 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:00:50,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337655323] [2021-11-21 00:00:50,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1337655323] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:00:50,522 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:00:50,522 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 00:00:50,522 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322649535] [2021-11-21 00:00:50,522 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:00:50,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:00:50,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:00:50,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:00:50,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:00:50,524 INFO L87 Difference]: Start difference. First operand 137 states and 204 transitions. Second operand has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:52,535 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:00:53,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:00:53,008 INFO L93 Difference]: Finished difference Result 279 states and 419 transitions. [2021-11-21 00:00:53,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:00:53,010 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 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 55 [2021-11-21 00:00:53,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:00:53,011 INFO L225 Difference]: With dead ends: 279 [2021-11-21 00:00:53,011 INFO L226 Difference]: Without dead ends: 154 [2021-11-21 00:00:53,012 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:00:53,012 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 120 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 32 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:00:53,013 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [120 Valid, 237 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 271 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-21 00:00:53,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-11-21 00:00:53,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2021-11-21 00:00:53,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.4736842105263157) internal successors, (224), 152 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:53,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 224 transitions. [2021-11-21 00:00:53,019 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 224 transitions. Word has length 55 [2021-11-21 00:00:53,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:00:53,020 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 224 transitions. [2021-11-21 00:00:53,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:53,020 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 224 transitions. [2021-11-21 00:00:53,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-21 00:00:53,021 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:00:53,021 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1] [2021-11-21 00:00:53,021 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-21 00:00:53,022 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:00:53,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:00:53,022 INFO L85 PathProgramCache]: Analyzing trace with hash -254995127, now seen corresponding path program 1 times [2021-11-21 00:00:53,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:00:53,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [560124453] [2021-11-21 00:00:53,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:00:53,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:00:53,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:00:53,095 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:00:53,095 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:00:53,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [560124453] [2021-11-21 00:00:53,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [560124453] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:00:53,096 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:00:53,096 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:00:53,096 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565967561] [2021-11-21 00:00:53,096 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:00:53,097 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:00:53,097 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:00:53,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:00:53,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:00:53,098 INFO L87 Difference]: Start difference. First operand 153 states and 224 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:55,109 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:00:55,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:00:55,461 INFO L93 Difference]: Finished difference Result 308 states and 451 transitions. [2021-11-21 00:00:55,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:00:55,462 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 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 56 [2021-11-21 00:00:55,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:00:55,463 INFO L225 Difference]: With dead ends: 308 [2021-11-21 00:00:55,463 INFO L226 Difference]: Without dead ends: 167 [2021-11-21 00:00:55,464 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 [2021-11-21 00:00:55,464 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 30 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:00:55,464 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 338 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 164 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 00:00:55,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-21 00:00:55,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 153. [2021-11-21 00:00:55,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.4671052631578947) internal successors, (223), 152 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:55,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 223 transitions. [2021-11-21 00:00:55,471 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 223 transitions. Word has length 56 [2021-11-21 00:00:55,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:00:55,471 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 223 transitions. [2021-11-21 00:00:55,472 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:55,472 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 223 transitions. [2021-11-21 00:00:55,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-21 00:00:55,472 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:00:55,473 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 00:00:55,473 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-21 00:00:55,473 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:00:55,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:00:55,474 INFO L85 PathProgramCache]: Analyzing trace with hash -329729726, now seen corresponding path program 1 times [2021-11-21 00:00:55,474 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:00:55,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021975118] [2021-11-21 00:00:55,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:00:55,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:00:55,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:00:55,538 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:00:55,538 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:00:55,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021975118] [2021-11-21 00:00:55,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1021975118] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:00:55,539 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:00:55,539 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:00:55,539 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482436653] [2021-11-21 00:00:55,539 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:00:55,540 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:00:55,540 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:00:55,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:00:55,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:00:55,541 INFO L87 Difference]: Start difference. First operand 153 states and 223 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:57,552 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:00:57,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:00:57,886 INFO L93 Difference]: Finished difference Result 308 states and 449 transitions. [2021-11-21 00:00:57,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:00:57,887 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 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 56 [2021-11-21 00:00:57,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:00:57,888 INFO L225 Difference]: With dead ends: 308 [2021-11-21 00:00:57,888 INFO L226 Difference]: Without dead ends: 167 [2021-11-21 00:00:57,889 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 [2021-11-21 00:00:57,889 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 25 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:00:57,889 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 338 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 164 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 00:00:57,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-21 00:00:57,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 153. [2021-11-21 00:00:57,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.4605263157894737) internal successors, (222), 152 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:57,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 222 transitions. [2021-11-21 00:00:57,896 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 222 transitions. Word has length 56 [2021-11-21 00:00:57,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:00:57,896 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 222 transitions. [2021-11-21 00:00:57,896 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:57,897 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 222 transitions. [2021-11-21 00:00:57,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-21 00:00:57,897 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:00:57,897 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] [2021-11-21 00:00:57,897 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-21 00:00:57,898 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:00:57,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:00:57,898 INFO L85 PathProgramCache]: Analyzing trace with hash -233013746, now seen corresponding path program 1 times [2021-11-21 00:00:57,898 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:00:57,898 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [211805272] [2021-11-21 00:00:57,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:00:57,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:00:57,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:00:57,972 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:00:57,973 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:00:57,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [211805272] [2021-11-21 00:00:57,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [211805272] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:00:57,973 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:00:57,973 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:00:57,974 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898783191] [2021-11-21 00:00:57,974 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:00:57,974 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:00:57,974 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:00:57,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:00:57,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:00:57,975 INFO L87 Difference]: Start difference. First operand 153 states and 222 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:00:59,986 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:00,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:00,372 INFO L93 Difference]: Finished difference Result 308 states and 447 transitions. [2021-11-21 00:01:00,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:01:00,374 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 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 56 [2021-11-21 00:01:00,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:00,375 INFO L225 Difference]: With dead ends: 308 [2021-11-21 00:01:00,375 INFO L226 Difference]: Without dead ends: 167 [2021-11-21 00:01:00,376 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 [2021-11-21 00:01:00,376 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 23 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 339 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:00,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 339 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 163 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-21 00:01:00,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-21 00:01:00,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 153. [2021-11-21 00:01:00,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.4539473684210527) internal successors, (221), 152 states have internal predecessors, (221), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:00,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 221 transitions. [2021-11-21 00:01:00,384 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 221 transitions. Word has length 56 [2021-11-21 00:01:00,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:00,384 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 221 transitions. [2021-11-21 00:01:00,384 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:00,384 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 221 transitions. [2021-11-21 00:01:00,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-21 00:01:00,385 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:00,385 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-11-21 00:01:00,386 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-21 00:01:00,386 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:00,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:00,386 INFO L85 PathProgramCache]: Analyzing trace with hash -625325043, now seen corresponding path program 1 times [2021-11-21 00:01:00,387 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:00,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1442939646] [2021-11-21 00:01:00,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:00,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:00,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:00,470 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 21 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:01:00,470 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:00,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1442939646] [2021-11-21 00:01:00,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1442939646] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:00,473 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:00,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:01:00,473 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329256972] [2021-11-21 00:01:00,473 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:00,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:01:00,474 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:00,474 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:01:00,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:01:00,474 INFO L87 Difference]: Start difference. First operand 153 states and 221 transitions. Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:02,485 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:02,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:02,842 INFO L93 Difference]: Finished difference Result 308 states and 445 transitions. [2021-11-21 00:01:02,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:01:02,844 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 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 57 [2021-11-21 00:01:02,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:02,845 INFO L225 Difference]: With dead ends: 308 [2021-11-21 00:01:02,845 INFO L226 Difference]: Without dead ends: 167 [2021-11-21 00:01:02,846 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 [2021-11-21 00:01:02,846 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 27 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:02,847 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 338 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 164 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 00:01:02,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-21 00:01:02,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 153. [2021-11-21 00:01:02,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.4473684210526316) internal successors, (220), 152 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:02,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 220 transitions. [2021-11-21 00:01:02,854 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 220 transitions. Word has length 57 [2021-11-21 00:01:02,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:02,854 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 220 transitions. [2021-11-21 00:01:02,855 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:02,855 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 220 transitions. [2021-11-21 00:01:02,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-21 00:01:02,855 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:02,856 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 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] [2021-11-21 00:01:02,856 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-21 00:01:02,856 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:02,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:02,857 INFO L85 PathProgramCache]: Analyzing trace with hash -996980410, now seen corresponding path program 1 times [2021-11-21 00:01:02,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:02,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [525684418] [2021-11-21 00:01:02,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:02,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:02,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:02,913 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:01:02,914 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:02,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [525684418] [2021-11-21 00:01:02,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [525684418] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:02,914 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:02,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:01:02,915 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1392993285] [2021-11-21 00:01:02,915 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:02,915 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:01:02,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:02,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:01:02,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:01:02,916 INFO L87 Difference]: Start difference. First operand 153 states and 220 transitions. Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:04,928 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:05,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:05,241 INFO L93 Difference]: Finished difference Result 306 states and 441 transitions. [2021-11-21 00:01:05,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:01:05,242 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 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 57 [2021-11-21 00:01:05,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:05,243 INFO L225 Difference]: With dead ends: 306 [2021-11-21 00:01:05,244 INFO L226 Difference]: Without dead ends: 165 [2021-11-21 00:01:05,244 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 [2021-11-21 00:01:05,244 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 22 mSDsluCounter, 228 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:05,245 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 342 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 160 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 00:01:05,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-11-21 00:01:05,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 153. [2021-11-21 00:01:05,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.4407894736842106) internal successors, (219), 152 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:05,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 219 transitions. [2021-11-21 00:01:05,252 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 219 transitions. Word has length 57 [2021-11-21 00:01:05,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:05,252 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 219 transitions. [2021-11-21 00:01:05,252 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:05,252 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 219 transitions. [2021-11-21 00:01:05,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-21 00:01:05,253 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:05,253 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1] [2021-11-21 00:01:05,253 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-21 00:01:05,254 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:05,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:05,255 INFO L85 PathProgramCache]: Analyzing trace with hash -1866789042, now seen corresponding path program 1 times [2021-11-21 00:01:05,255 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:05,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601072] [2021-11-21 00:01:05,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:05,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:05,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:05,336 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:01:05,336 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:05,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601072] [2021-11-21 00:01:05,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [601072] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:05,336 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:05,337 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:01:05,337 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346004649] [2021-11-21 00:01:05,337 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:05,337 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:01:05,337 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:05,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:01:05,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:01:05,338 INFO L87 Difference]: Start difference. First operand 153 states and 219 transitions. Second operand has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:07,350 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:07,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:07,596 INFO L93 Difference]: Finished difference Result 306 states and 439 transitions. [2021-11-21 00:01:07,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:01:07,598 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 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 58 [2021-11-21 00:01:07,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:07,599 INFO L225 Difference]: With dead ends: 306 [2021-11-21 00:01:07,599 INFO L226 Difference]: Without dead ends: 165 [2021-11-21 00:01:07,600 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 [2021-11-21 00:01:07,600 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 24 mSDsluCounter, 228 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:07,601 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 342 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 160 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2021-11-21 00:01:07,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-11-21 00:01:07,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 153. [2021-11-21 00:01:07,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.4342105263157894) internal successors, (218), 152 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:07,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 218 transitions. [2021-11-21 00:01:07,608 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 218 transitions. Word has length 58 [2021-11-21 00:01:07,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:07,609 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 218 transitions. [2021-11-21 00:01:07,609 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:07,609 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 218 transitions. [2021-11-21 00:01:07,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-21 00:01:07,610 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:07,610 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] [2021-11-21 00:01:07,610 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-21 00:01:07,610 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:07,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:07,611 INFO L85 PathProgramCache]: Analyzing trace with hash -48638542, now seen corresponding path program 1 times [2021-11-21 00:01:07,611 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:07,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186018589] [2021-11-21 00:01:07,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:07,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:07,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:07,668 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:01:07,668 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:07,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186018589] [2021-11-21 00:01:07,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [186018589] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:07,668 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:07,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:01:07,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299593163] [2021-11-21 00:01:07,669 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:07,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:01:07,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:07,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:01:07,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:01:07,670 INFO L87 Difference]: Start difference. First operand 153 states and 218 transitions. Second operand has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:09,687 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:09,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:09,991 INFO L93 Difference]: Finished difference Result 298 states and 428 transitions. [2021-11-21 00:01:09,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:01:09,992 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 0 states have call successors, (0), 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 59 [2021-11-21 00:01:09,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:09,994 INFO L225 Difference]: With dead ends: 298 [2021-11-21 00:01:09,994 INFO L226 Difference]: Without dead ends: 157 [2021-11-21 00:01:09,994 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 [2021-11-21 00:01:09,995 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 18 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:09,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 350 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 152 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 00:01:09,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-11-21 00:01:10,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 153. [2021-11-21 00:01:10,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.4276315789473684) internal successors, (217), 152 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:10,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 217 transitions. [2021-11-21 00:01:10,004 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 217 transitions. Word has length 59 [2021-11-21 00:01:10,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:10,004 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 217 transitions. [2021-11-21 00:01:10,005 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:10,005 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 217 transitions. [2021-11-21 00:01:10,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-21 00:01:10,006 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:10,006 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] [2021-11-21 00:01:10,006 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-21 00:01:10,006 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:10,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:10,007 INFO L85 PathProgramCache]: Analyzing trace with hash -731046424, now seen corresponding path program 1 times [2021-11-21 00:01:10,007 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:10,007 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [333124994] [2021-11-21 00:01:10,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:10,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:10,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:10,085 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:01:10,085 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:10,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [333124994] [2021-11-21 00:01:10,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [333124994] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:01:10,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1451796211] [2021-11-21 00:01:10,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:10,090 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:01:10,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:01:10,092 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:01:10,134 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:01:10,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:10,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 00:01:10,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:01:10,604 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:01:10,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:01:10,828 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:01:10,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1451796211] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 00:01:10,829 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:01:10,829 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4, 4] total 5 [2021-11-21 00:01:10,830 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343221965] [2021-11-21 00:01:10,830 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:10,830 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:01:10,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:10,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:01:10,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:01:10,832 INFO L87 Difference]: Start difference. First operand 153 states and 217 transitions. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 2 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:12,844 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:12,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:12,991 INFO L93 Difference]: Finished difference Result 296 states and 423 transitions. [2021-11-21 00:01:12,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:01:12,993 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 2 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2021-11-21 00:01:12,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:12,995 INFO L225 Difference]: With dead ends: 296 [2021-11-21 00:01:12,995 INFO L226 Difference]: Without dead ends: 294 [2021-11-21 00:01:12,995 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:01:12,996 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 118 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:12,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [118 Valid, 276 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 41 Invalid, 1 Unknown, 0 Unchecked, 2.1s Time] [2021-11-21 00:01:12,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2021-11-21 00:01:13,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 289. [2021-11-21 00:01:13,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.4409722222222223) internal successors, (415), 288 states have internal predecessors, (415), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:13,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 415 transitions. [2021-11-21 00:01:13,009 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 415 transitions. Word has length 62 [2021-11-21 00:01:13,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:13,010 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 415 transitions. [2021-11-21 00:01:13,010 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 2 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:13,010 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 415 transitions. [2021-11-21 00:01:13,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-21 00:01:13,011 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:13,011 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] [2021-11-21 00:01:13,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:01:13,226 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:01:13,226 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:13,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:13,227 INFO L85 PathProgramCache]: Analyzing trace with hash 981757880, now seen corresponding path program 1 times [2021-11-21 00:01:13,227 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:13,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [823764408] [2021-11-21 00:01:13,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:13,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:13,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:13,297 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:01:13,297 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:13,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [823764408] [2021-11-21 00:01:13,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [823764408] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:01:13,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1246936924] [2021-11-21 00:01:13,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:13,298 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:01:13,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:01:13,299 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:01:13,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:01:13,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:13,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 00:01:13,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:01:13,697 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:01:13,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:01:13,952 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:01:13,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1246936924] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 00:01:13,952 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:01:13,952 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4, 4] total 5 [2021-11-21 00:01:13,954 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50916200] [2021-11-21 00:01:13,955 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:13,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:01:13,955 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:13,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:01:13,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:01:13,956 INFO L87 Difference]: Start difference. First operand 289 states and 415 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:15,971 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:16,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:16,138 INFO L93 Difference]: Finished difference Result 563 states and 815 transitions. [2021-11-21 00:01:16,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:01:16,139 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-21 00:01:16,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:16,142 INFO L225 Difference]: With dead ends: 563 [2021-11-21 00:01:16,143 INFO L226 Difference]: Without dead ends: 561 [2021-11-21 00:01:16,143 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:01:16,144 INFO L933 BasicCegarLoop]: 140 mSDtfsCounter, 108 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 5 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:16,144 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 277 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 43 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2021-11-21 00:01:16,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 561 states. [2021-11-21 00:01:16,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 561 to 561. [2021-11-21 00:01:16,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 561 states, 560 states have (on average 1.45) internal successors, (812), 560 states have internal predecessors, (812), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:16,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 561 states to 561 states and 812 transitions. [2021-11-21 00:01:16,171 INFO L78 Accepts]: Start accepts. Automaton has 561 states and 812 transitions. Word has length 69 [2021-11-21 00:01:16,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:16,171 INFO L470 AbstractCegarLoop]: Abstraction has 561 states and 812 transitions. [2021-11-21 00:01:16,172 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:16,172 INFO L276 IsEmpty]: Start isEmpty. Operand 561 states and 812 transitions. [2021-11-21 00:01:16,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-11-21 00:01:16,173 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:16,174 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1] [2021-11-21 00:01:16,213 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:01:16,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:01:16,390 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:16,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:16,391 INFO L85 PathProgramCache]: Analyzing trace with hash 623338396, now seen corresponding path program 1 times [2021-11-21 00:01:16,391 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:16,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923744166] [2021-11-21 00:01:16,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:16,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:16,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:16,477 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 44 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:01:16,478 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:16,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923744166] [2021-11-21 00:01:16,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1923744166] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:16,480 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:16,480 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:01:16,480 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75210112] [2021-11-21 00:01:16,480 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:16,481 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:01:16,481 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:16,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:01:16,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:01:16,482 INFO L87 Difference]: Start difference. First operand 561 states and 812 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) [2021-11-21 00:01:18,491 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:18,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:18,953 INFO L93 Difference]: Finished difference Result 1280 states and 1862 transitions. [2021-11-21 00:01:18,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:01:18,954 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 91 [2021-11-21 00:01:18,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:18,959 INFO L225 Difference]: With dead ends: 1280 [2021-11-21 00:01:18,959 INFO L226 Difference]: Without dead ends: 731 [2021-11-21 00:01:18,960 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 [2021-11-21 00:01:18,961 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 29 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 410 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:18,962 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 410 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 198 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-21 00:01:18,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 731 states. [2021-11-21 00:01:18,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 731 to 657. [2021-11-21 00:01:18,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 657 states, 656 states have (on average 1.4878048780487805) internal successors, (976), 656 states have internal predecessors, (976), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:18,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 657 states to 657 states and 976 transitions. [2021-11-21 00:01:18,992 INFO L78 Accepts]: Start accepts. Automaton has 657 states and 976 transitions. Word has length 91 [2021-11-21 00:01:18,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:18,993 INFO L470 AbstractCegarLoop]: Abstraction has 657 states and 976 transitions. [2021-11-21 00:01:18,993 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) [2021-11-21 00:01:18,993 INFO L276 IsEmpty]: Start isEmpty. Operand 657 states and 976 transitions. [2021-11-21 00:01:18,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-21 00:01:18,995 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:18,996 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:01:18,996 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-21 00:01:18,996 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:18,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:18,997 INFO L85 PathProgramCache]: Analyzing trace with hash -1783366998, now seen corresponding path program 1 times [2021-11-21 00:01:18,997 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:18,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [93416971] [2021-11-21 00:01:18,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:18,997 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:19,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:19,138 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:01:19,138 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:19,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [93416971] [2021-11-21 00:01:19,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [93416971] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:19,139 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:19,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:01:19,139 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883799597] [2021-11-21 00:01:19,139 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:19,140 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:01:19,140 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:19,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:01:19,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:01:19,141 INFO L87 Difference]: Start difference. First operand 657 states and 976 transitions. Second operand has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:21,153 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:21,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:21,610 INFO L93 Difference]: Finished difference Result 1376 states and 2022 transitions. [2021-11-21 00:01:21,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:01:21,611 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 0 states have call successors, (0), 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 [2021-11-21 00:01:21,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:21,616 INFO L225 Difference]: With dead ends: 1376 [2021-11-21 00:01:21,616 INFO L226 Difference]: Without dead ends: 731 [2021-11-21 00:01:21,617 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 [2021-11-21 00:01:21,618 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 42 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 410 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:21,618 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 410 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 196 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-21 00:01:21,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 731 states. [2021-11-21 00:01:21,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 731 to 657. [2021-11-21 00:01:21,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 657 states, 656 states have (on average 1.4817073170731707) internal successors, (972), 656 states have internal predecessors, (972), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:21,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 657 states to 657 states and 972 transitions. [2021-11-21 00:01:21,645 INFO L78 Accepts]: Start accepts. Automaton has 657 states and 972 transitions. Word has length 103 [2021-11-21 00:01:21,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:21,646 INFO L470 AbstractCegarLoop]: Abstraction has 657 states and 972 transitions. [2021-11-21 00:01:21,646 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:21,646 INFO L276 IsEmpty]: Start isEmpty. Operand 657 states and 972 transitions. [2021-11-21 00:01:21,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-21 00:01:21,648 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:21,648 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:01:21,649 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-21 00:01:21,649 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:21,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:21,649 INFO L85 PathProgramCache]: Analyzing trace with hash 23043217, now seen corresponding path program 1 times [2021-11-21 00:01:21,650 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:21,650 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690956112] [2021-11-21 00:01:21,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:21,650 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:21,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:21,719 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:01:21,719 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:21,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [690956112] [2021-11-21 00:01:21,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [690956112] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:21,720 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:21,720 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:01:21,720 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978109012] [2021-11-21 00:01:21,721 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:21,721 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:01:21,721 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:21,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:01:21,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:01:21,722 INFO L87 Difference]: Start difference. First operand 657 states and 972 transitions. Second operand has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:23,737 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:24,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:24,175 INFO L93 Difference]: Finished difference Result 1376 states and 2014 transitions. [2021-11-21 00:01:24,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:01:24,177 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 0 states have call successors, (0), 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 [2021-11-21 00:01:24,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:24,181 INFO L225 Difference]: With dead ends: 1376 [2021-11-21 00:01:24,182 INFO L226 Difference]: Without dead ends: 731 [2021-11-21 00:01:24,183 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 [2021-11-21 00:01:24,184 INFO L933 BasicCegarLoop]: 168 mSDtfsCounter, 37 mSDsluCounter, 266 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 408 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:24,184 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 408 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 196 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-21 00:01:24,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 731 states. [2021-11-21 00:01:24,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 731 to 657. [2021-11-21 00:01:24,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 657 states, 656 states have (on average 1.475609756097561) internal successors, (968), 656 states have internal predecessors, (968), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:24,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 657 states to 657 states and 968 transitions. [2021-11-21 00:01:24,214 INFO L78 Accepts]: Start accepts. Automaton has 657 states and 968 transitions. Word has length 103 [2021-11-21 00:01:24,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:24,214 INFO L470 AbstractCegarLoop]: Abstraction has 657 states and 968 transitions. [2021-11-21 00:01:24,214 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:24,215 INFO L276 IsEmpty]: Start isEmpty. Operand 657 states and 968 transitions. [2021-11-21 00:01:24,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-21 00:01:24,217 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:24,217 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1] [2021-11-21 00:01:24,217 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-21 00:01:24,217 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:24,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:24,218 INFO L85 PathProgramCache]: Analyzing trace with hash -1207494075, now seen corresponding path program 1 times [2021-11-21 00:01:24,218 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:24,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243880615] [2021-11-21 00:01:24,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:24,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:24,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:24,314 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 89 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:01:24,314 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:24,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1243880615] [2021-11-21 00:01:24,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1243880615] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:24,315 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:24,315 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:01:24,315 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281312189] [2021-11-21 00:01:24,315 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:24,316 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:01:24,316 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:24,316 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:01:24,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:01:24,317 INFO L87 Difference]: Start difference. First operand 657 states and 968 transitions. Second operand has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:26,329 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:26,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:26,743 INFO L93 Difference]: Finished difference Result 1376 states and 2006 transitions. [2021-11-21 00:01:26,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:01:26,744 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 0 states have call successors, (0), 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 [2021-11-21 00:01:26,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:26,749 INFO L225 Difference]: With dead ends: 1376 [2021-11-21 00:01:26,750 INFO L226 Difference]: Without dead ends: 731 [2021-11-21 00:01:26,751 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 [2021-11-21 00:01:26,752 INFO L933 BasicCegarLoop]: 168 mSDtfsCounter, 35 mSDsluCounter, 266 mSDsCounter, 0 mSdLazyCounter, 192 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 409 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 192 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:26,752 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 409 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 192 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-21 00:01:26,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 731 states. [2021-11-21 00:01:26,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 731 to 657. [2021-11-21 00:01:26,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 657 states, 656 states have (on average 1.4695121951219512) internal successors, (964), 656 states have internal predecessors, (964), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:26,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 657 states to 657 states and 964 transitions. [2021-11-21 00:01:26,782 INFO L78 Accepts]: Start accepts. Automaton has 657 states and 964 transitions. Word has length 103 [2021-11-21 00:01:26,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:26,783 INFO L470 AbstractCegarLoop]: Abstraction has 657 states and 964 transitions. [2021-11-21 00:01:26,783 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:26,783 INFO L276 IsEmpty]: Start isEmpty. Operand 657 states and 964 transitions. [2021-11-21 00:01:26,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-21 00:01:26,786 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:26,786 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:01:26,786 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-21 00:01:26,786 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:26,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:26,787 INFO L85 PathProgramCache]: Analyzing trace with hash -175256864, now seen corresponding path program 1 times [2021-11-21 00:01:26,787 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:26,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435603785] [2021-11-21 00:01:26,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:26,788 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:26,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:26,856 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 69 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:01:26,857 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:26,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435603785] [2021-11-21 00:01:26,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435603785] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:26,857 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:26,858 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:01:26,858 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91391366] [2021-11-21 00:01:26,858 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:26,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:01:26,859 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:26,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:01:26,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:01:26,860 INFO L87 Difference]: Start difference. First operand 657 states and 964 transitions. Second operand has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:28,877 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:29,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:29,326 INFO L93 Difference]: Finished difference Result 1376 states and 1998 transitions. [2021-11-21 00:01:29,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:01:29,327 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 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 [2021-11-21 00:01:29,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:29,331 INFO L225 Difference]: With dead ends: 1376 [2021-11-21 00:01:29,331 INFO L226 Difference]: Without dead ends: 731 [2021-11-21 00:01:29,333 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 [2021-11-21 00:01:29,333 INFO L933 BasicCegarLoop]: 167 mSDtfsCounter, 39 mSDsluCounter, 265 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 406 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:29,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 406 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 193 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-21 00:01:29,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 731 states. [2021-11-21 00:01:29,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 731 to 657. [2021-11-21 00:01:29,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 657 states, 656 states have (on average 1.4634146341463414) internal successors, (960), 656 states have internal predecessors, (960), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:29,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 657 states to 657 states and 960 transitions. [2021-11-21 00:01:29,373 INFO L78 Accepts]: Start accepts. Automaton has 657 states and 960 transitions. Word has length 104 [2021-11-21 00:01:29,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:29,373 INFO L470 AbstractCegarLoop]: Abstraction has 657 states and 960 transitions. [2021-11-21 00:01:29,374 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:29,374 INFO L276 IsEmpty]: Start isEmpty. Operand 657 states and 960 transitions. [2021-11-21 00:01:29,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-21 00:01:29,376 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:29,376 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:01:29,376 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-21 00:01:29,377 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:29,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:29,377 INFO L85 PathProgramCache]: Analyzing trace with hash 1932602247, now seen corresponding path program 1 times [2021-11-21 00:01:29,377 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:29,378 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724474182] [2021-11-21 00:01:29,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:29,378 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:29,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:29,453 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 85 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:01:29,453 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:29,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724474182] [2021-11-21 00:01:29,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724474182] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:29,454 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:29,454 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:01:29,454 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911028732] [2021-11-21 00:01:29,454 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:29,455 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:01:29,455 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:29,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:01:29,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:01:29,456 INFO L87 Difference]: Start difference. First operand 657 states and 960 transitions. Second operand has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:31,467 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:31,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:31,891 INFO L93 Difference]: Finished difference Result 1368 states and 1982 transitions. [2021-11-21 00:01:31,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:01:31,893 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 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 [2021-11-21 00:01:31,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:31,898 INFO L225 Difference]: With dead ends: 1368 [2021-11-21 00:01:31,898 INFO L226 Difference]: Without dead ends: 723 [2021-11-21 00:01:31,900 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 [2021-11-21 00:01:31,901 INFO L933 BasicCegarLoop]: 166 mSDtfsCounter, 34 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 404 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:31,901 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 404 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 188 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-21 00:01:31,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 723 states. [2021-11-21 00:01:31,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 723 to 657. [2021-11-21 00:01:31,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 657 states, 656 states have (on average 1.4573170731707317) internal successors, (956), 656 states have internal predecessors, (956), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:31,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 657 states to 657 states and 956 transitions. [2021-11-21 00:01:31,929 INFO L78 Accepts]: Start accepts. Automaton has 657 states and 956 transitions. Word has length 104 [2021-11-21 00:01:31,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:31,930 INFO L470 AbstractCegarLoop]: Abstraction has 657 states and 956 transitions. [2021-11-21 00:01:31,930 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:31,930 INFO L276 IsEmpty]: Start isEmpty. Operand 657 states and 956 transitions. [2021-11-21 00:01:31,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-21 00:01:31,932 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:31,933 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:01:31,933 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-11-21 00:01:31,933 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:31,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:31,934 INFO L85 PathProgramCache]: Analyzing trace with hash 1603014725, now seen corresponding path program 1 times [2021-11-21 00:01:31,934 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:31,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131542793] [2021-11-21 00:01:31,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:31,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:31,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:32,010 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:01:32,010 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:32,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131542793] [2021-11-21 00:01:32,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2131542793] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:32,011 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:32,011 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:01:32,012 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315979153] [2021-11-21 00:01:32,012 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:32,012 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:01:32,013 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:32,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:01:32,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:01:32,014 INFO L87 Difference]: Start difference. First operand 657 states and 956 transitions. Second operand has 4 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:34,028 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:34,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:34,354 INFO L93 Difference]: Finished difference Result 1368 states and 1974 transitions. [2021-11-21 00:01:34,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:01:34,355 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 105 [2021-11-21 00:01:34,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:34,359 INFO L225 Difference]: With dead ends: 1368 [2021-11-21 00:01:34,359 INFO L226 Difference]: Without dead ends: 723 [2021-11-21 00:01:34,360 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 [2021-11-21 00:01:34,361 INFO L933 BasicCegarLoop]: 165 mSDtfsCounter, 36 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 402 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:34,362 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 402 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 188 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 00:01:34,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 723 states. [2021-11-21 00:01:34,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 723 to 657. [2021-11-21 00:01:34,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 657 states, 656 states have (on average 1.451219512195122) internal successors, (952), 656 states have internal predecessors, (952), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:34,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 657 states to 657 states and 952 transitions. [2021-11-21 00:01:34,387 INFO L78 Accepts]: Start accepts. Automaton has 657 states and 952 transitions. Word has length 105 [2021-11-21 00:01:34,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:34,388 INFO L470 AbstractCegarLoop]: Abstraction has 657 states and 952 transitions. [2021-11-21 00:01:34,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:34,388 INFO L276 IsEmpty]: Start isEmpty. Operand 657 states and 952 transitions. [2021-11-21 00:01:34,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-21 00:01:34,390 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:34,390 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, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:01:34,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-11-21 00:01:34,391 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:34,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:34,391 INFO L85 PathProgramCache]: Analyzing trace with hash -398064627, now seen corresponding path program 1 times [2021-11-21 00:01:34,392 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:34,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629653985] [2021-11-21 00:01:34,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:34,392 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:34,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:34,465 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 61 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:01:34,465 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:34,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629653985] [2021-11-21 00:01:34,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1629653985] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:01:34,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [717471776] [2021-11-21 00:01:34,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:34,466 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:01:34,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:01:34,474 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:01:34,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:01:34,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:34,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:01:34,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:01:34,937 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 61 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:01:34,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:01:35,240 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:01:35,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [717471776] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 00:01:35,241 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:01:35,241 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4, 4] total 5 [2021-11-21 00:01:35,241 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791328441] [2021-11-21 00:01:35,241 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:35,242 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:01:35,242 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:35,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:01:35,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:01:35,242 INFO L87 Difference]: Start difference. First operand 657 states and 952 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:37,255 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:37,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:37,439 INFO L93 Difference]: Finished difference Result 1616 states and 2354 transitions. [2021-11-21 00:01:37,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:01:37,440 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 105 [2021-11-21 00:01:37,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:37,447 INFO L225 Difference]: With dead ends: 1616 [2021-11-21 00:01:37,447 INFO L226 Difference]: Without dead ends: 1291 [2021-11-21 00:01:37,448 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 208 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:01:37,449 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 112 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 275 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:37,449 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 275 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 37 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2021-11-21 00:01:37,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1291 states. [2021-11-21 00:01:37,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1291 to 1279. [2021-11-21 00:01:37,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1279 states, 1278 states have (on average 1.4577464788732395) internal successors, (1863), 1278 states have internal predecessors, (1863), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:37,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1279 states to 1279 states and 1863 transitions. [2021-11-21 00:01:37,496 INFO L78 Accepts]: Start accepts. Automaton has 1279 states and 1863 transitions. Word has length 105 [2021-11-21 00:01:37,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:37,497 INFO L470 AbstractCegarLoop]: Abstraction has 1279 states and 1863 transitions. [2021-11-21 00:01:37,497 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:37,497 INFO L276 IsEmpty]: Start isEmpty. Operand 1279 states and 1863 transitions. [2021-11-21 00:01:37,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-21 00:01:37,499 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:37,500 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:01:37,534 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-21 00:01:37,714 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-21 00:01:37,714 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:37,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:37,715 INFO L85 PathProgramCache]: Analyzing trace with hash 66356827, now seen corresponding path program 1 times [2021-11-21 00:01:37,715 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:37,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1480342460] [2021-11-21 00:01:37,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:37,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:37,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:37,788 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 77 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:01:37,788 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:37,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1480342460] [2021-11-21 00:01:37,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1480342460] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:37,789 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:37,789 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:01:37,789 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775044284] [2021-11-21 00:01:37,789 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:37,790 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:01:37,790 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:37,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:01:37,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:01:37,791 INFO L87 Difference]: Start difference. First operand 1279 states and 1863 transitions. Second operand has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:39,802 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:40,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:40,128 INFO L93 Difference]: Finished difference Result 2614 states and 3790 transitions. [2021-11-21 00:01:40,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:01:40,129 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 0 states have call successors, (0), 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 106 [2021-11-21 00:01:40,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:40,136 INFO L225 Difference]: With dead ends: 2614 [2021-11-21 00:01:40,137 INFO L226 Difference]: Without dead ends: 1347 [2021-11-21 00:01:40,139 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 [2021-11-21 00:01:40,140 INFO L933 BasicCegarLoop]: 160 mSDtfsCounter, 30 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 392 SdHoareTripleChecker+Invalid, 181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:40,140 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 392 Invalid, 181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 177 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 00:01:40,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1347 states. [2021-11-21 00:01:40,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1347 to 1279. [2021-11-21 00:01:40,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1279 states, 1278 states have (on average 1.4514866979655712) internal successors, (1855), 1278 states have internal predecessors, (1855), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:40,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1279 states to 1279 states and 1855 transitions. [2021-11-21 00:01:40,212 INFO L78 Accepts]: Start accepts. Automaton has 1279 states and 1855 transitions. Word has length 106 [2021-11-21 00:01:40,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:40,213 INFO L470 AbstractCegarLoop]: Abstraction has 1279 states and 1855 transitions. [2021-11-21 00:01:40,213 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:40,213 INFO L276 IsEmpty]: Start isEmpty. Operand 1279 states and 1855 transitions. [2021-11-21 00:01:40,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-21 00:01:40,215 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:40,216 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 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] [2021-11-21 00:01:40,216 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-11-21 00:01:40,216 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:40,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:40,217 INFO L85 PathProgramCache]: Analyzing trace with hash -1955221781, now seen corresponding path program 2 times [2021-11-21 00:01:40,217 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:40,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336561064] [2021-11-21 00:01:40,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:40,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:40,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:40,293 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 104 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:01:40,293 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:40,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [336561064] [2021-11-21 00:01:40,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [336561064] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:40,293 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:40,294 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:01:40,294 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537750232] [2021-11-21 00:01:40,294 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:40,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:01:40,295 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:40,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:01:40,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:01:40,295 INFO L87 Difference]: Start difference. First operand 1279 states and 1855 transitions. Second operand has 4 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:42,307 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:42,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:42,633 INFO L93 Difference]: Finished difference Result 2614 states and 3774 transitions. [2021-11-21 00:01:42,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:01:42,634 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 109 [2021-11-21 00:01:42,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:42,641 INFO L225 Difference]: With dead ends: 2614 [2021-11-21 00:01:42,642 INFO L226 Difference]: Without dead ends: 1347 [2021-11-21 00:01:42,644 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 [2021-11-21 00:01:42,645 INFO L933 BasicCegarLoop]: 159 mSDtfsCounter, 22 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 390 SdHoareTripleChecker+Invalid, 181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:42,645 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 390 Invalid, 181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 177 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 00:01:42,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1347 states. [2021-11-21 00:01:42,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1347 to 1279. [2021-11-21 00:01:42,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1279 states, 1278 states have (on average 1.445226917057903) internal successors, (1847), 1278 states have internal predecessors, (1847), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:42,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1279 states to 1279 states and 1847 transitions. [2021-11-21 00:01:42,690 INFO L78 Accepts]: Start accepts. Automaton has 1279 states and 1847 transitions. Word has length 109 [2021-11-21 00:01:42,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:42,691 INFO L470 AbstractCegarLoop]: Abstraction has 1279 states and 1847 transitions. [2021-11-21 00:01:42,691 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:42,691 INFO L276 IsEmpty]: Start isEmpty. Operand 1279 states and 1847 transitions. [2021-11-21 00:01:42,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-21 00:01:42,694 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:42,694 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 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] [2021-11-21 00:01:42,694 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-11-21 00:01:42,694 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:42,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:42,695 INFO L85 PathProgramCache]: Analyzing trace with hash 207308673, now seen corresponding path program 1 times [2021-11-21 00:01:42,695 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:42,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [599026589] [2021-11-21 00:01:42,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:42,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:42,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:42,782 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 106 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:01:42,782 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:42,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [599026589] [2021-11-21 00:01:42,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [599026589] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:42,782 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:42,783 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:01:42,783 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016024136] [2021-11-21 00:01:42,783 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:42,783 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:01:42,784 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:42,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:01:42,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:01:42,785 INFO L87 Difference]: Start difference. First operand 1279 states and 1847 transitions. Second operand has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:44,796 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:45,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:45,090 INFO L93 Difference]: Finished difference Result 2598 states and 3742 transitions. [2021-11-21 00:01:45,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:01:45,091 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 110 [2021-11-21 00:01:45,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:45,098 INFO L225 Difference]: With dead ends: 2598 [2021-11-21 00:01:45,098 INFO L226 Difference]: Without dead ends: 1331 [2021-11-21 00:01:45,100 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 [2021-11-21 00:01:45,101 INFO L933 BasicCegarLoop]: 158 mSDtfsCounter, 19 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 388 SdHoareTripleChecker+Invalid, 176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:45,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 388 Invalid, 176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 172 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 00:01:45,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1331 states. [2021-11-21 00:01:45,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1331 to 1279. [2021-11-21 00:01:45,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1279 states, 1278 states have (on average 1.4389671361502347) internal successors, (1839), 1278 states have internal predecessors, (1839), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:45,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1279 states to 1279 states and 1839 transitions. [2021-11-21 00:01:45,144 INFO L78 Accepts]: Start accepts. Automaton has 1279 states and 1839 transitions. Word has length 110 [2021-11-21 00:01:45,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:45,145 INFO L470 AbstractCegarLoop]: Abstraction has 1279 states and 1839 transitions. [2021-11-21 00:01:45,145 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:45,145 INFO L276 IsEmpty]: Start isEmpty. Operand 1279 states and 1839 transitions. [2021-11-21 00:01:45,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-21 00:01:45,148 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:45,148 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:01:45,148 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-11-21 00:01:45,148 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:45,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:45,149 INFO L85 PathProgramCache]: Analyzing trace with hash 1828199297, now seen corresponding path program 1 times [2021-11-21 00:01:45,149 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:45,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2093309000] [2021-11-21 00:01:45,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:45,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:45,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:45,251 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:01:45,252 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:45,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2093309000] [2021-11-21 00:01:45,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2093309000] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:01:45,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [671465533] [2021-11-21 00:01:45,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:45,253 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:01:45,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:01:45,258 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:01:45,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:01:45,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:45,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 504 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 00:01:45,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:01:45,832 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:01:45,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:01:46,643 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 124 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-21 00:01:46,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [671465533] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 00:01:46,644 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:01:46,644 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 6] total 11 [2021-11-21 00:01:46,644 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725899498] [2021-11-21 00:01:46,644 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:46,645 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:01:46,645 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:46,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:01:46,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2021-11-21 00:01:46,646 INFO L87 Difference]: Start difference. First operand 1279 states and 1839 transitions. Second operand has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 5 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) [2021-11-21 00:01:48,657 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:49,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:49,052 INFO L93 Difference]: Finished difference Result 3198 states and 4605 transitions. [2021-11-21 00:01:49,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:01:49,053 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 5 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 116 [2021-11-21 00:01:49,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:49,065 INFO L225 Difference]: With dead ends: 3198 [2021-11-21 00:01:49,065 INFO L226 Difference]: Without dead ends: 2561 [2021-11-21 00:01:49,067 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 226 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2021-11-21 00:01:49,068 INFO L933 BasicCegarLoop]: 309 mSDtfsCounter, 375 mSDsluCounter, 492 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 20 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 375 SdHoareTripleChecker+Valid, 767 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:49,068 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [375 Valid, 767 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 113 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 00:01:49,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2561 states. [2021-11-21 00:01:49,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2561 to 2213. [2021-11-21 00:01:49,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2213 states, 2212 states have (on average 1.4430379746835442) internal successors, (3192), 2212 states have internal predecessors, (3192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:49,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2213 states to 2213 states and 3192 transitions. [2021-11-21 00:01:49,147 INFO L78 Accepts]: Start accepts. Automaton has 2213 states and 3192 transitions. Word has length 116 [2021-11-21 00:01:49,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:49,148 INFO L470 AbstractCegarLoop]: Abstraction has 2213 states and 3192 transitions. [2021-11-21 00:01:49,148 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 5 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) [2021-11-21 00:01:49,148 INFO L276 IsEmpty]: Start isEmpty. Operand 2213 states and 3192 transitions. [2021-11-21 00:01:49,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-21 00:01:49,153 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:49,153 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:01:49,191 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:01:49,366 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-21 00:01:49,366 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:49,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:49,367 INFO L85 PathProgramCache]: Analyzing trace with hash 1240127126, now seen corresponding path program 1 times [2021-11-21 00:01:49,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:49,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246469581] [2021-11-21 00:01:49,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:49,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:49,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:49,476 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 150 proven. 0 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2021-11-21 00:01:49,476 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:49,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246469581] [2021-11-21 00:01:49,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1246469581] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:49,477 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:49,477 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:01:49,477 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478092636] [2021-11-21 00:01:49,478 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:49,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:01:49,478 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:49,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:01:49,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:01:49,479 INFO L87 Difference]: Start difference. First operand 2213 states and 3192 transitions. Second operand has 4 states, 4 states have (on average 26.25) internal successors, (105), 4 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:51,490 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:52,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:52,046 INFO L93 Difference]: Finished difference Result 5148 states and 7484 transitions. [2021-11-21 00:01:52,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:01:52,047 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 26.25) internal successors, (105), 4 states have internal predecessors, (105), 0 states have call successors, (0), 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 146 [2021-11-21 00:01:52,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:52,062 INFO L225 Difference]: With dead ends: 5148 [2021-11-21 00:01:52,063 INFO L226 Difference]: Without dead ends: 2947 [2021-11-21 00:01:52,066 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 [2021-11-21 00:01:52,067 INFO L933 BasicCegarLoop]: 175 mSDtfsCounter, 40 mSDsluCounter, 273 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 422 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:52,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 422 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 225 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-21 00:01:52,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2947 states. [2021-11-21 00:01:52,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2947 to 2577. [2021-11-21 00:01:52,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2577 states, 2576 states have (on average 1.483695652173913) internal successors, (3822), 2576 states have internal predecessors, (3822), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:52,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2577 states to 2577 states and 3822 transitions. [2021-11-21 00:01:52,182 INFO L78 Accepts]: Start accepts. Automaton has 2577 states and 3822 transitions. Word has length 146 [2021-11-21 00:01:52,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:52,182 INFO L470 AbstractCegarLoop]: Abstraction has 2577 states and 3822 transitions. [2021-11-21 00:01:52,182 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 26.25) internal successors, (105), 4 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:52,183 INFO L276 IsEmpty]: Start isEmpty. Operand 2577 states and 3822 transitions. [2021-11-21 00:01:52,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-21 00:01:52,188 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:52,188 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:01:52,188 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-11-21 00:01:52,188 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:52,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:52,189 INFO L85 PathProgramCache]: Analyzing trace with hash 763049210, now seen corresponding path program 2 times [2021-11-21 00:01:52,189 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:52,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48255254] [2021-11-21 00:01:52,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:52,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:52,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:52,352 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 164 proven. 0 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-21 00:01:52,352 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:52,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48255254] [2021-11-21 00:01:52,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [48255254] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:52,353 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:52,353 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 00:01:52,353 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862707984] [2021-11-21 00:01:52,353 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:52,354 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:01:52,354 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:52,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:01:52,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:01:52,355 INFO L87 Difference]: Start difference. First operand 2577 states and 3822 transitions. Second operand has 6 states, 6 states have (on average 16.833333333333332) internal successors, (101), 6 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) [2021-11-21 00:01:54,366 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:55,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:55,036 INFO L93 Difference]: Finished difference Result 5462 states and 8135 transitions. [2021-11-21 00:01:55,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:01:55,036 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.833333333333332) internal successors, (101), 6 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 146 [2021-11-21 00:01:55,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:55,056 INFO L225 Difference]: With dead ends: 5462 [2021-11-21 00:01:55,056 INFO L226 Difference]: Without dead ends: 3802 [2021-11-21 00:01:55,063 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 [2021-11-21 00:01:55,064 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 151 mSDsluCounter, 323 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 16 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 401 SdHoareTripleChecker+Invalid, 415 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:55,064 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [151 Valid, 401 Invalid, 415 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 398 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-21 00:01:55,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3802 states. [2021-11-21 00:01:55,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3802 to 3095. [2021-11-21 00:01:55,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3095 states, 3094 states have (on average 1.5384615384615385) internal successors, (4760), 3094 states have internal predecessors, (4760), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:55,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3095 states to 3095 states and 4760 transitions. [2021-11-21 00:01:55,173 INFO L78 Accepts]: Start accepts. Automaton has 3095 states and 4760 transitions. Word has length 146 [2021-11-21 00:01:55,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:55,174 INFO L470 AbstractCegarLoop]: Abstraction has 3095 states and 4760 transitions. [2021-11-21 00:01:55,174 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.833333333333332) internal successors, (101), 6 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) [2021-11-21 00:01:55,174 INFO L276 IsEmpty]: Start isEmpty. Operand 3095 states and 4760 transitions. [2021-11-21 00:01:55,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-21 00:01:55,203 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:55,203 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:01:55,203 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-11-21 00:01:55,203 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:55,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:55,205 INFO L85 PathProgramCache]: Analyzing trace with hash -999905289, now seen corresponding path program 1 times [2021-11-21 00:01:55,205 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:55,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1434524939] [2021-11-21 00:01:55,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:55,206 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:55,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:55,347 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 164 proven. 0 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-21 00:01:55,347 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:55,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1434524939] [2021-11-21 00:01:55,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1434524939] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:55,348 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:55,348 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 00:01:55,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90020109] [2021-11-21 00:01:55,349 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:55,350 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:01:55,350 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:55,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:01:55,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:01:55,351 INFO L87 Difference]: Start difference. First operand 3095 states and 4760 transitions. Second operand has 6 states, 6 states have (on average 17.0) internal successors, (102), 6 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) [2021-11-21 00:01:57,362 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:01:57,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:57,937 INFO L93 Difference]: Finished difference Result 5772 states and 8699 transitions. [2021-11-21 00:01:57,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:01:57,938 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.0) internal successors, (102), 6 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 147 [2021-11-21 00:01:57,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:57,964 INFO L225 Difference]: With dead ends: 5772 [2021-11-21 00:01:57,971 INFO L226 Difference]: Without dead ends: 3779 [2021-11-21 00:01:57,974 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 [2021-11-21 00:01:57,975 INFO L933 BasicCegarLoop]: 107 mSDtfsCounter, 180 mSDsluCounter, 296 mSDsCounter, 0 mSdLazyCounter, 370 mSolverCounterSat, 19 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 373 SdHoareTripleChecker+Invalid, 390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 370 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:57,975 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [180 Valid, 373 Invalid, 390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 370 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-21 00:01:57,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3779 states. [2021-11-21 00:01:58,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3779 to 3109. [2021-11-21 00:01:58,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3109 states, 3108 states have (on average 1.5360360360360361) internal successors, (4774), 3108 states have internal predecessors, (4774), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:01:58,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3109 states to 3109 states and 4774 transitions. [2021-11-21 00:01:58,082 INFO L78 Accepts]: Start accepts. Automaton has 3109 states and 4774 transitions. Word has length 147 [2021-11-21 00:01:58,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:58,083 INFO L470 AbstractCegarLoop]: Abstraction has 3109 states and 4774 transitions. [2021-11-21 00:01:58,083 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.0) internal successors, (102), 6 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) [2021-11-21 00:01:58,083 INFO L276 IsEmpty]: Start isEmpty. Operand 3109 states and 4774 transitions. [2021-11-21 00:01:58,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-21 00:01:58,089 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:58,089 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:01:58,089 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-11-21 00:01:58,090 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:58,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:58,090 INFO L85 PathProgramCache]: Analyzing trace with hash -1781825876, now seen corresponding path program 1 times [2021-11-21 00:01:58,090 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:58,090 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [61232724] [2021-11-21 00:01:58,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:58,091 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:58,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:58,231 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 192 proven. 0 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-21 00:01:58,231 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:58,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [61232724] [2021-11-21 00:01:58,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [61232724] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:58,231 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:58,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:01:58,232 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277386450] [2021-11-21 00:01:58,232 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:58,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:01:58,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:58,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:01:58,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:01:58,234 INFO L87 Difference]: Start difference. First operand 3109 states and 4774 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) [2021-11-21 00:02:00,246 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:02:00,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:02:00,769 INFO L93 Difference]: Finished difference Result 7383 states and 11325 transitions. [2021-11-21 00:02:00,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:02:00,771 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 158 [2021-11-21 00:02:00,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:02:00,778 INFO L225 Difference]: With dead ends: 7383 [2021-11-21 00:02:00,779 INFO L226 Difference]: Without dead ends: 4286 [2021-11-21 00:02:00,783 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 [2021-11-21 00:02:00,783 INFO L933 BasicCegarLoop]: 203 mSDtfsCounter, 89 mSDsluCounter, 303 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 478 SdHoareTripleChecker+Invalid, 299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:02:00,784 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 478 Invalid, 299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 287 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-21 00:02:00,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4286 states. [2021-11-21 00:02:00,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4286 to 3417. [2021-11-21 00:02:00,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3417 states, 3416 states have (on average 1.5491803278688525) internal successors, (5292), 3416 states have internal predecessors, (5292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:00,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3417 states to 3417 states and 5292 transitions. [2021-11-21 00:02:00,906 INFO L78 Accepts]: Start accepts. Automaton has 3417 states and 5292 transitions. Word has length 158 [2021-11-21 00:02:00,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:02:00,907 INFO L470 AbstractCegarLoop]: Abstraction has 3417 states and 5292 transitions. [2021-11-21 00:02:00,907 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) [2021-11-21 00:02:00,907 INFO L276 IsEmpty]: Start isEmpty. Operand 3417 states and 5292 transitions. [2021-11-21 00:02:00,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-21 00:02:00,913 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:02:00,913 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:02:00,914 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-11-21 00:02:00,914 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:02:00,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:02:00,914 INFO L85 PathProgramCache]: Analyzing trace with hash 916623780, now seen corresponding path program 2 times [2021-11-21 00:02:00,915 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:02:00,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1174627698] [2021-11-21 00:02:00,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:02:00,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:02:00,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:02:01,014 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 161 proven. 0 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2021-11-21 00:02:01,015 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:02:01,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1174627698] [2021-11-21 00:02:01,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1174627698] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:02:01,015 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:02:01,015 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:02:01,016 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046472435] [2021-11-21 00:02:01,016 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:02:01,017 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:02:01,017 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:02:01,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:02:01,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:02:01,018 INFO L87 Difference]: Start difference. First operand 3417 states and 5292 transitions. Second operand has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 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) [2021-11-21 00:02:03,030 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:02:03,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:02:03,490 INFO L93 Difference]: Finished difference Result 7192 states and 11040 transitions. [2021-11-21 00:02:03,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:02:03,491 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 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 158 [2021-11-21 00:02:03,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:02:03,499 INFO L225 Difference]: With dead ends: 7192 [2021-11-21 00:02:03,499 INFO L226 Difference]: Without dead ends: 3787 [2021-11-21 00:02:03,503 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 [2021-11-21 00:02:03,504 INFO L933 BasicCegarLoop]: 175 mSDtfsCounter, 55 mSDsluCounter, 273 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 422 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:02:03,504 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 422 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 223 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-21 00:02:03,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3787 states. [2021-11-21 00:02:03,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3787 to 3417. [2021-11-21 00:02:03,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3417 states, 3416 states have (on average 1.5450819672131149) internal successors, (5278), 3416 states have internal predecessors, (5278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:03,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3417 states to 3417 states and 5278 transitions. [2021-11-21 00:02:03,626 INFO L78 Accepts]: Start accepts. Automaton has 3417 states and 5278 transitions. Word has length 158 [2021-11-21 00:02:03,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:02:03,626 INFO L470 AbstractCegarLoop]: Abstraction has 3417 states and 5278 transitions. [2021-11-21 00:02:03,627 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 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) [2021-11-21 00:02:03,627 INFO L276 IsEmpty]: Start isEmpty. Operand 3417 states and 5278 transitions. [2021-11-21 00:02:03,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-21 00:02:03,633 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:02:03,633 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:02:03,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-11-21 00:02:03,634 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:02:03,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:02:03,634 INFO L85 PathProgramCache]: Analyzing trace with hash 1762338123, now seen corresponding path program 1 times [2021-11-21 00:02:03,634 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:02:03,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [502269764] [2021-11-21 00:02:03,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:02:03,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:02:03,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:02:03,749 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 170 proven. 0 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-11-21 00:02:03,749 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:02:03,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [502269764] [2021-11-21 00:02:03,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [502269764] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:02:03,750 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:02:03,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:02:03,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977391288] [2021-11-21 00:02:03,750 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:02:03,751 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:02:03,751 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:02:03,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:02:03,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:02:03,752 INFO L87 Difference]: Start difference. First operand 3417 states and 5278 transitions. Second operand has 4 states, 4 states have (on average 27.0) internal successors, (108), 4 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:05,764 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:02:06,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:02:06,254 INFO L93 Difference]: Finished difference Result 7682 states and 11852 transitions. [2021-11-21 00:02:06,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:02:06,256 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.0) internal successors, (108), 4 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 158 [2021-11-21 00:02:06,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:02:06,265 INFO L225 Difference]: With dead ends: 7682 [2021-11-21 00:02:06,265 INFO L226 Difference]: Without dead ends: 4277 [2021-11-21 00:02:06,277 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 [2021-11-21 00:02:06,278 INFO L933 BasicCegarLoop]: 181 mSDtfsCounter, 46 mSDsluCounter, 279 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 434 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:02:06,278 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 434 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 240 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-21 00:02:06,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4277 states. [2021-11-21 00:02:06,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4277 to 3837. [2021-11-21 00:02:06,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3837 states, 3836 states have (on average 1.5693430656934306) internal successors, (6020), 3836 states have internal predecessors, (6020), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:06,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3837 states to 3837 states and 6020 transitions. [2021-11-21 00:02:06,458 INFO L78 Accepts]: Start accepts. Automaton has 3837 states and 6020 transitions. Word has length 158 [2021-11-21 00:02:06,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:02:06,459 INFO L470 AbstractCegarLoop]: Abstraction has 3837 states and 6020 transitions. [2021-11-21 00:02:06,459 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.0) internal successors, (108), 4 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:06,459 INFO L276 IsEmpty]: Start isEmpty. Operand 3837 states and 6020 transitions. [2021-11-21 00:02:06,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-21 00:02:06,466 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:02:06,466 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:02:06,466 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-11-21 00:02:06,466 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:02:06,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:02:06,467 INFO L85 PathProgramCache]: Analyzing trace with hash -1629048833, now seen corresponding path program 1 times [2021-11-21 00:02:06,467 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:02:06,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504250662] [2021-11-21 00:02:06,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:02:06,468 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:02:06,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:02:06,631 INFO L134 CoverageAnalysis]: Checked inductivity of 299 backedges. 174 proven. 0 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2021-11-21 00:02:06,631 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:02:06,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504250662] [2021-11-21 00:02:06,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1504250662] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:02:06,631 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:02:06,632 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:02:06,632 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975619939] [2021-11-21 00:02:06,632 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:02:06,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:02:06,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:02:06,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:02:06,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:02:06,633 INFO L87 Difference]: Start difference. First operand 3837 states and 6020 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) [2021-11-21 00:02:08,645 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:02:09,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:02:09,206 INFO L93 Difference]: Finished difference Result 7286 states and 11337 transitions. [2021-11-21 00:02:09,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:02:09,208 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 158 [2021-11-21 00:02:09,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:02:09,217 INFO L225 Difference]: With dead ends: 7286 [2021-11-21 00:02:09,217 INFO L226 Difference]: Without dead ends: 4816 [2021-11-21 00:02:09,220 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 [2021-11-21 00:02:09,221 INFO L933 BasicCegarLoop]: 202 mSDtfsCounter, 73 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 10 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 476 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:02:09,221 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 476 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 289 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-21 00:02:09,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4816 states. [2021-11-21 00:02:09,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4816 to 4157. [2021-11-21 00:02:09,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4157 states, 4156 states have (on average 1.5907122232916266) internal successors, (6611), 4156 states have internal predecessors, (6611), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:09,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4157 states to 4157 states and 6611 transitions. [2021-11-21 00:02:09,371 INFO L78 Accepts]: Start accepts. Automaton has 4157 states and 6611 transitions. Word has length 158 [2021-11-21 00:02:09,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:02:09,372 INFO L470 AbstractCegarLoop]: Abstraction has 4157 states and 6611 transitions. [2021-11-21 00:02:09,372 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) [2021-11-21 00:02:09,372 INFO L276 IsEmpty]: Start isEmpty. Operand 4157 states and 6611 transitions. [2021-11-21 00:02:09,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-21 00:02:09,378 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:02:09,378 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:02:09,379 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-11-21 00:02:09,379 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:02:09,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:02:09,379 INFO L85 PathProgramCache]: Analyzing trace with hash 922711600, now seen corresponding path program 1 times [2021-11-21 00:02:09,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:02:09,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271852300] [2021-11-21 00:02:09,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:02:09,380 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:02:09,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:02:09,553 INFO L134 CoverageAnalysis]: Checked inductivity of 266 backedges. 0 proven. 215 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-21 00:02:09,553 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:02:09,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271852300] [2021-11-21 00:02:09,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271852300] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:02:09,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257238520] [2021-11-21 00:02:09,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:02:09,555 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:02:09,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:02:09,562 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:02:09,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:02:09,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:02:09,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:02:09,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:02:10,042 INFO L354 Elim1Store]: treesize reduction 74, result has 46.0 percent of original size [2021-11-21 00:02:10,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 172 treesize of output 163 [2021-11-21 00:02:10,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 140 treesize of output 110 [2021-11-21 00:02:10,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 110 treesize of output 80 [2021-11-21 00:02:10,090 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 00:02:10,167 INFO L354 Elim1Store]: treesize reduction 15, result has 6.3 percent of original size [2021-11-21 00:02:10,168 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 30 [2021-11-21 00:02:10,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 11 [2021-11-21 00:02:10,654 INFO L134 CoverageAnalysis]: Checked inductivity of 266 backedges. 189 proven. 0 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-21 00:02:10,654 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:02:10,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [257238520] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:02:10,655 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:02:10,655 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 8 [2021-11-21 00:02:10,655 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304350861] [2021-11-21 00:02:10,655 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:02:10,656 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:02:10,656 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:02:10,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:02:10,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:02:10,657 INFO L87 Difference]: Start difference. First operand 4157 states and 6611 transitions. Second operand has 4 states, 4 states have (on average 27.0) internal successors, (108), 4 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:12,672 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:02:13,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:02:13,326 INFO L93 Difference]: Finished difference Result 8049 states and 12721 transitions. [2021-11-21 00:02:13,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:02:13,327 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.0) internal successors, (108), 4 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 159 [2021-11-21 00:02:13,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:02:13,337 INFO L225 Difference]: With dead ends: 8049 [2021-11-21 00:02:13,337 INFO L226 Difference]: Without dead ends: 5334 [2021-11-21 00:02:13,342 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:02:13,342 INFO L933 BasicCegarLoop]: 200 mSDtfsCounter, 74 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 284 mSolverCounterSat, 10 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 472 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 284 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:02:13,343 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 472 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 284 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-21 00:02:13,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5334 states. [2021-11-21 00:02:13,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5334 to 4465. [2021-11-21 00:02:13,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4465 states, 4464 states have (on average 1.6001344086021505) internal successors, (7143), 4464 states have internal predecessors, (7143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:13,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4465 states to 4465 states and 7143 transitions. [2021-11-21 00:02:13,520 INFO L78 Accepts]: Start accepts. Automaton has 4465 states and 7143 transitions. Word has length 159 [2021-11-21 00:02:13,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:02:13,521 INFO L470 AbstractCegarLoop]: Abstraction has 4465 states and 7143 transitions. [2021-11-21 00:02:13,521 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.0) internal successors, (108), 4 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:13,521 INFO L276 IsEmpty]: Start isEmpty. Operand 4465 states and 7143 transitions. [2021-11-21 00:02:13,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-21 00:02:13,528 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:02:13,529 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:02:13,571 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:02:13,750 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:02:13,750 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:02:13,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:02:13,751 INFO L85 PathProgramCache]: Analyzing trace with hash 549551614, now seen corresponding path program 1 times [2021-11-21 00:02:13,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:02:13,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572729295] [2021-11-21 00:02:13,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:02:13,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:02:13,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:02:13,841 INFO L134 CoverageAnalysis]: Checked inductivity of 299 backedges. 174 proven. 0 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2021-11-21 00:02:13,841 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:02:13,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1572729295] [2021-11-21 00:02:13,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1572729295] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:02:13,842 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:02:13,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:02:13,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290658644] [2021-11-21 00:02:13,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:02:13,843 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:02:13,843 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:02:13,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:02:13,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:02:13,844 INFO L87 Difference]: Start difference. First operand 4465 states and 7143 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) [2021-11-21 00:02:15,856 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:02:16,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:02:16,450 INFO L93 Difference]: Finished difference Result 8224 states and 13024 transitions. [2021-11-21 00:02:16,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:02:16,452 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 159 [2021-11-21 00:02:16,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:02:16,462 INFO L225 Difference]: With dead ends: 8224 [2021-11-21 00:02:16,462 INFO L226 Difference]: Without dead ends: 5311 [2021-11-21 00:02:16,467 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 [2021-11-21 00:02:16,467 INFO L933 BasicCegarLoop]: 196 mSDtfsCounter, 65 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 284 mSolverCounterSat, 10 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 284 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:02:16,468 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 464 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 284 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-21 00:02:16,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5311 states. [2021-11-21 00:02:16,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5311 to 4465. [2021-11-21 00:02:16,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4465 states, 4464 states have (on average 1.6001344086021505) internal successors, (7143), 4464 states have internal predecessors, (7143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:16,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4465 states to 4465 states and 7143 transitions. [2021-11-21 00:02:16,636 INFO L78 Accepts]: Start accepts. Automaton has 4465 states and 7143 transitions. Word has length 159 [2021-11-21 00:02:16,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:02:16,637 INFO L470 AbstractCegarLoop]: Abstraction has 4465 states and 7143 transitions. [2021-11-21 00:02:16,637 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) [2021-11-21 00:02:16,637 INFO L276 IsEmpty]: Start isEmpty. Operand 4465 states and 7143 transitions. [2021-11-21 00:02:16,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-21 00:02:16,643 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:02:16,644 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:02:16,644 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-11-21 00:02:16,644 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:02:16,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:02:16,644 INFO L85 PathProgramCache]: Analyzing trace with hash 1898847095, now seen corresponding path program 1 times [2021-11-21 00:02:16,646 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:02:16,646 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965185918] [2021-11-21 00:02:16,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:02:16,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:02:16,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:02:16,857 INFO L134 CoverageAnalysis]: Checked inductivity of 266 backedges. 0 proven. 235 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-21 00:02:16,857 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:02:16,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965185918] [2021-11-21 00:02:16,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1965185918] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:02:16,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [522305944] [2021-11-21 00:02:16,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:02:16,858 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:02:16,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:02:16,862 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:02:16,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:02:17,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:02:17,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 661 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:02:17,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:02:17,552 INFO L134 CoverageAnalysis]: Checked inductivity of 266 backedges. 0 proven. 235 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-21 00:02:17,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:02:18,374 INFO L134 CoverageAnalysis]: Checked inductivity of 266 backedges. 0 proven. 157 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2021-11-21 00:02:18,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [522305944] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:02:18,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1973658376] [2021-11-21 00:02:18,407 INFO L159 IcfgInterpreter]: Started Sifa with 68 locations of interest [2021-11-21 00:02:18,407 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:02:18,412 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:02:18,418 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:02:18,419 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:02:19,318 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:02:19,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:02:19,495 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: Some non-self update cases but no top-level DER relation at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.DerPreprocessor.(DerPreprocessor.java:146) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.ElimStorePlain.applyComplexEliminationRules(ElimStorePlain.java:340) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionSaa.tryToEliminate(DualJunctionSaa.java:140) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionSaa.tryToEliminateOne(DualJunctionSaa.java:115) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionSaa.tryExhaustivelyToEliminate(DualJunctionSaa.java:93) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionSaa.tryToEliminate(DualJunctionSaa.java:88) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.tryToEliminateOne(QuantifierPusher.java:903) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.applyNewEliminationTechniquesExhaustively(QuantifierPusher.java:865) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.applyDualJunctionEliminationTechniques(QuantifierPusher.java:783) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.tryToPushOverDualFiniteConnective2(QuantifierPusher.java:425) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.tryToPushOverDualFiniteConnective(QuantifierPusher.java:355) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.QuantifierPushTermWalker.convert(QuantifierPushTermWalker.java:162) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.QuantifierPushTermWalker.convert(QuantifierPushTermWalker.java:1) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.TermContextTransformationEngine$ApplicationTermTask.doStep(TermContextTransformationEngine.java:169) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.TermContextTransformationEngine.transform(TermContextTransformationEngine.java:77) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.TermContextTransformationEngine.transform(TermContextTransformationEngine.java:61) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.QuantifierPushTermWalker.eliminate(QuantifierPushTermWalker.java:243) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.QuantifierPushTermWalker.eliminate(QuantifierPushTermWalker.java:233) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.PartialQuantifierElimination.eliminate(PartialQuantifierElimination.java:92) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools$EliminatingTermDomainOperationProvider.newQuantifier(SymbolicTools.java:278) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools$EliminatingTermDomainOperationProvider.projectExistentially(SymbolicTools.java:264) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermDomainOperationProvider.projectExistentially(TermDomainOperationProvider.java:1) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateTransformer.strongestPostcondition(PredicateTransformer.java:131) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.post(SymbolicTools.java:116) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretInternal(DagInterpreter.java:227) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTransAndStoreLoiPred(DagInterpreter.java:209) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTrans(DagInterpreter.java:187) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:165) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 00:02:19,498 INFO L158 Benchmark]: Toolchain (without parser) took 122129.64ms. Allocated memory was 100.7MB in the beginning and 314.6MB in the end (delta: 213.9MB). Free memory was 65.7MB in the beginning and 184.0MB in the end (delta: -118.3MB). Peak memory consumption was 198.6MB. Max. memory is 16.1GB. [2021-11-21 00:02:19,498 INFO L158 Benchmark]: CDTParser took 0.29ms. Allocated memory is still 100.7MB. Free memory was 53.3MB in the beginning and 53.2MB in the end (delta: 84.0kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-21 00:02:19,499 INFO L158 Benchmark]: CACSL2BoogieTranslator took 822.74ms. Allocated memory is still 100.7MB. Free memory was 65.5MB in the beginning and 55.3MB in the end (delta: 10.2MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2021-11-21 00:02:19,499 INFO L158 Benchmark]: Boogie Procedure Inliner took 94.96ms. Allocated memory is still 100.7MB. Free memory was 55.3MB in the beginning and 50.4MB in the end (delta: 4.9MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-11-21 00:02:19,499 INFO L158 Benchmark]: Boogie Preprocessor took 168.83ms. Allocated memory was 100.7MB in the beginning and 127.9MB in the end (delta: 27.3MB). Free memory was 50.4MB in the beginning and 98.7MB in the end (delta: -48.3MB). Peak memory consumption was 15.7MB. Max. memory is 16.1GB. [2021-11-21 00:02:19,499 INFO L158 Benchmark]: RCFGBuilder took 3712.46ms. Allocated memory was 127.9MB in the beginning and 163.6MB in the end (delta: 35.7MB). Free memory was 98.7MB in the beginning and 108.0MB in the end (delta: -9.4MB). Peak memory consumption was 56.7MB. Max. memory is 16.1GB. [2021-11-21 00:02:19,499 INFO L158 Benchmark]: TraceAbstraction took 117321.08ms. Allocated memory was 163.6MB in the beginning and 314.6MB in the end (delta: 151.0MB). Free memory was 107.0MB in the beginning and 184.0MB in the end (delta: -77.0MB). Peak memory consumption was 178.8MB. Max. memory is 16.1GB. [2021-11-21 00:02:19,501 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29ms. Allocated memory is still 100.7MB. Free memory was 53.3MB in the beginning and 53.2MB in the end (delta: 84.0kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 822.74ms. Allocated memory is still 100.7MB. Free memory was 65.5MB in the beginning and 55.3MB in the end (delta: 10.2MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 94.96ms. Allocated memory is still 100.7MB. Free memory was 55.3MB in the beginning and 50.4MB in the end (delta: 4.9MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Boogie Preprocessor took 168.83ms. Allocated memory was 100.7MB in the beginning and 127.9MB in the end (delta: 27.3MB). Free memory was 50.4MB in the beginning and 98.7MB in the end (delta: -48.3MB). Peak memory consumption was 15.7MB. Max. memory is 16.1GB. * RCFGBuilder took 3712.46ms. Allocated memory was 127.9MB in the beginning and 163.6MB in the end (delta: 35.7MB). Free memory was 98.7MB in the beginning and 108.0MB in the end (delta: -9.4MB). Peak memory consumption was 56.7MB. Max. memory is 16.1GB. * TraceAbstraction took 117321.08ms. Allocated memory was 163.6MB in the beginning and 314.6MB in the end (delta: 151.0MB). Free memory was 107.0MB in the beginning and 184.0MB in the end (delta: -77.0MB). Peak memory consumption was 178.8MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: Some non-self update cases but no top-level DER relation de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: Some non-self update cases but no top-level DER relation: de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.DerPreprocessor.(DerPreprocessor.java:146) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-21 00:02:19,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/openssl/s3_srvr.blast.11.i.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d2558e20908ca51bd715f698f032e0721784debd5f3c1dc69de7f261de8133a0 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:02:21,942 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:02:21,944 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:02:21,991 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:02:21,992 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:02:21,997 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:02:22,000 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:02:22,009 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:02:22,012 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:02:22,023 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:02:22,024 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:02:22,026 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:02:22,027 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:02:22,030 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:02:22,032 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:02:22,034 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:02:22,040 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:02:22,041 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:02:22,043 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:02:22,049 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:02:22,052 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:02:22,055 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:02:22,057 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:02:22,059 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:02:22,064 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:02:22,066 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:02:22,066 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:02:22,069 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:02:22,070 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:02:22,071 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:02:22,072 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:02:22,073 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:02:22,076 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:02:22,076 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:02:22,078 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:02:22,079 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:02:22,080 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:02:22,094 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:02:22,095 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:02:22,097 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:02:22,098 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:02:22,103 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-21 00:02:22,162 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:02:22,163 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:02:22,164 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:02:22,164 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:02:22,165 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:02:22,165 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:02:22,165 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:02:22,166 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:02:22,166 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:02:22,166 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:02:22,167 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:02:22,168 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:02:22,169 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:02:22,170 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:02:22,170 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:02:22,170 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:02:22,171 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:02:22,171 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:02:22,171 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:02:22,171 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-21 00:02:22,172 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-21 00:02:22,172 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:02:22,172 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:02:22,172 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:02:22,173 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:02:22,173 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:02:22,173 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-21 00:02:22,173 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:02:22,174 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:02:22,174 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:02:22,174 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:02:22,174 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:02:22,175 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-21 00:02:22,175 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-21 00:02:22,175 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:02:22,176 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:02:22,176 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:02:22,176 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d2558e20908ca51bd715f698f032e0721784debd5f3c1dc69de7f261de8133a0 [2021-11-21 00:02:22,560 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:02:22,591 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:02:22,595 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:02:22,596 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:02:22,597 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:02:22,599 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/openssl/s3_srvr.blast.11.i.cil-2.c [2021-11-21 00:02:22,668 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/data/4726411d0/ca2f1a98d26547cdae6f20036236125f/FLAGc4cb9fed8 [2021-11-21 00:02:23,444 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:02:23,444 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/sv-benchmarks/c/openssl/s3_srvr.blast.11.i.cil-2.c [2021-11-21 00:02:23,469 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/data/4726411d0/ca2f1a98d26547cdae6f20036236125f/FLAGc4cb9fed8 [2021-11-21 00:02:23,602 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/data/4726411d0/ca2f1a98d26547cdae6f20036236125f [2021-11-21 00:02:23,604 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:02:23,606 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:02:23,607 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:02:23,608 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:02:23,612 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:02:23,613 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:02:23" (1/1) ... [2021-11-21 00:02:23,614 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a138d0a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:02:23, skipping insertion in model container [2021-11-21 00:02:23,615 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:02:23" (1/1) ... [2021-11-21 00:02:23,624 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:02:23,698 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:02:24,198 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_06120594-a61b-4afc-86ee-64c2a48b820f/sv-benchmarks/c/openssl/s3_srvr.blast.11.i.cil-2.c[74369,74382] [2021-11-21 00:02:24,212 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:02:24,242 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:02:24,437 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_06120594-a61b-4afc-86ee-64c2a48b820f/sv-benchmarks/c/openssl/s3_srvr.blast.11.i.cil-2.c[74369,74382] [2021-11-21 00:02:24,440 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:02:24,459 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:02:24,459 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:02:24 WrapperNode [2021-11-21 00:02:24,460 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:02:24,461 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:02:24,461 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:02:24,461 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:02:24,468 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:02:24" (1/1) ... [2021-11-21 00:02:24,523 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:02:24" (1/1) ... [2021-11-21 00:02:24,580 INFO L137 Inliner]: procedures = 35, calls = 223, calls flagged for inlining = 7, calls inlined = 3, statements flattened = 762 [2021-11-21 00:02:24,581 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:02:24,581 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:02:24,582 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:02:24,582 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:02:24,591 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:02:24" (1/1) ... [2021-11-21 00:02:24,591 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:02:24" (1/1) ... [2021-11-21 00:02:24,603 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:02:24" (1/1) ... [2021-11-21 00:02:24,603 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:02:24" (1/1) ... [2021-11-21 00:02:24,670 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:02:24" (1/1) ... [2021-11-21 00:02:24,679 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:02:24" (1/1) ... [2021-11-21 00:02:24,683 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:02:24" (1/1) ... [2021-11-21 00:02:24,689 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:02:24,691 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:02:24,691 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:02:24,691 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:02:24,692 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:02:24" (1/1) ... [2021-11-21 00:02:24,699 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:02:24,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:02:24,736 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:02:24,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:02:24,794 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:02:24,795 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-21 00:02:24,795 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-21 00:02:24,797 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-21 00:02:24,797 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-21 00:02:24,799 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-21 00:02:24,799 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:02:24,799 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:02:24,800 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-21 00:02:25,057 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:02:25,065 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:02:25,093 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-21 00:02:29,243 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##90: assume false; [2021-11-21 00:02:29,244 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##91: assume !false; [2021-11-21 00:02:29,244 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:02:29,255 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:02:29,256 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-21 00:02:29,258 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:02:29 BoogieIcfgContainer [2021-11-21 00:02:29,259 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:02:29,261 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:02:29,261 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:02:29,265 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:02:29,265 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:02:23" (1/3) ... [2021-11-21 00:02:29,266 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fb04304 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:02:29, skipping insertion in model container [2021-11-21 00:02:29,266 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:02:24" (2/3) ... [2021-11-21 00:02:29,267 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fb04304 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:02:29, skipping insertion in model container [2021-11-21 00:02:29,267 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:02:29" (3/3) ... [2021-11-21 00:02:29,268 INFO L111 eAbstractionObserver]: Analyzing ICFG s3_srvr.blast.11.i.cil-2.c [2021-11-21 00:02:29,274 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:02:29,274 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:02:29,340 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:02:29,356 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 00:02:29,356 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:02:29,379 INFO L276 IsEmpty]: Start isEmpty. Operand has 150 states, 148 states have (on average 1.7162162162162162) internal successors, (254), 149 states have internal predecessors, (254), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:29,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-21 00:02:29,391 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:02:29,392 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] [2021-11-21 00:02:29,392 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:02:29,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:02:29,398 INFO L85 PathProgramCache]: Analyzing trace with hash -442385417, now seen corresponding path program 1 times [2021-11-21 00:02:29,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:02:29,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [914059083] [2021-11-21 00:02:29,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:02:29,415 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:02:29,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:02:29,420 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:02:29,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-21 00:02:29,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:02:29,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:02:29,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:02:29,996 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:02:29,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:02:30,261 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:02:30,262 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:02:30,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [914059083] [2021-11-21 00:02:30,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [914059083] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:02:30,264 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:02:30,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-21 00:02:30,266 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371142706] [2021-11-21 00:02:30,266 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:02:30,271 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:02:30,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:02:30,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:02:30,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:02:30,300 INFO L87 Difference]: Start difference. First operand has 150 states, 148 states have (on average 1.7162162162162162) internal successors, (254), 149 states have internal predecessors, (254), 0 states have call successors, (0), 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 17.5) internal successors, (70), 4 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:30,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:02:30,537 INFO L93 Difference]: Finished difference Result 566 states and 965 transitions. [2021-11-21 00:02:30,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:02:30,539 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.5) internal successors, (70), 4 states have internal predecessors, (70), 0 states have call successors, (0), 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 [2021-11-21 00:02:30,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:02:30,554 INFO L225 Difference]: With dead ends: 566 [2021-11-21 00:02:30,554 INFO L226 Difference]: Without dead ends: 387 [2021-11-21 00:02:30,558 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:02:30,562 INFO L933 BasicCegarLoop]: 232 mSDtfsCounter, 402 mSDsluCounter, 438 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 402 SdHoareTripleChecker+Valid, 670 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:02:30,563 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [402 Valid, 670 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:02:30,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2021-11-21 00:02:30,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 385. [2021-11-21 00:02:30,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 384 states have (on average 1.5286458333333333) internal successors, (587), 384 states have internal predecessors, (587), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:30,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 587 transitions. [2021-11-21 00:02:30,628 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 587 transitions. Word has length 37 [2021-11-21 00:02:30,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:02:30,628 INFO L470 AbstractCegarLoop]: Abstraction has 385 states and 587 transitions. [2021-11-21 00:02:30,628 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 17.5) internal successors, (70), 4 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:30,628 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 587 transitions. [2021-11-21 00:02:30,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-21 00:02:30,632 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:02:30,632 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:02:30,650 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:02:30,832 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:02:30,833 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:02:30,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:02:30,834 INFO L85 PathProgramCache]: Analyzing trace with hash 1287801256, now seen corresponding path program 1 times [2021-11-21 00:02:30,835 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:02:30,835 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1818165101] [2021-11-21 00:02:30,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:02:30,835 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:02:30,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:02:30,840 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:02:30,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-21 00:02:31,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:02:31,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:02:31,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:02:31,378 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:02:31,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:02:31,729 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:02:31,729 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:02:31,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1818165101] [2021-11-21 00:02:31,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1818165101] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:02:31,730 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:02:31,730 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-21 00:02:31,730 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646636975] [2021-11-21 00:02:31,731 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:02:31,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:02:31,736 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:02:31,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:02:31,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:02:31,738 INFO L87 Difference]: Start difference. First operand 385 states and 587 transitions. Second operand has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 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) [2021-11-21 00:02:32,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:02:32,042 INFO L93 Difference]: Finished difference Result 884 states and 1359 transitions. [2021-11-21 00:02:32,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:02:32,043 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 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 61 [2021-11-21 00:02:32,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:02:32,049 INFO L225 Difference]: With dead ends: 884 [2021-11-21 00:02:32,049 INFO L226 Difference]: Without dead ends: 633 [2021-11-21 00:02:32,051 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:02:32,053 INFO L933 BasicCegarLoop]: 361 mSDtfsCounter, 302 mSDsluCounter, 369 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 302 SdHoareTripleChecker+Valid, 730 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:02:32,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [302 Valid, 730 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:02:32,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 633 states. [2021-11-21 00:02:32,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 633 to 631. [2021-11-21 00:02:32,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 631 states, 630 states have (on average 1.5206349206349206) internal successors, (958), 630 states have internal predecessors, (958), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:32,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 631 states to 631 states and 958 transitions. [2021-11-21 00:02:32,093 INFO L78 Accepts]: Start accepts. Automaton has 631 states and 958 transitions. Word has length 61 [2021-11-21 00:02:32,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:02:32,094 INFO L470 AbstractCegarLoop]: Abstraction has 631 states and 958 transitions. [2021-11-21 00:02:32,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 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) [2021-11-21 00:02:32,094 INFO L276 IsEmpty]: Start isEmpty. Operand 631 states and 958 transitions. [2021-11-21 00:02:32,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-21 00:02:32,103 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:02:32,103 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:02:32,119 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:02:32,315 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:02:32,316 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:02:32,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:02:32,316 INFO L85 PathProgramCache]: Analyzing trace with hash -1861684425, now seen corresponding path program 1 times [2021-11-21 00:02:32,317 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:02:32,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [865540692] [2021-11-21 00:02:32,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:02:32,318 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:02:32,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:02:32,319 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:02:32,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-21 00:02:32,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:02:32,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:02:32,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:02:32,989 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 79 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:02:32,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:02:33,416 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 79 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:02:33,416 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:02:33,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [865540692] [2021-11-21 00:02:33,416 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [865540692] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:02:33,416 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:02:33,416 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-21 00:02:33,417 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993072011] [2021-11-21 00:02:33,417 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:02:33,417 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:02:33,417 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:02:33,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:02:33,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:02:33,418 INFO L87 Difference]: Start difference. First operand 631 states and 958 transitions. Second operand has 4 states, 4 states have (on average 37.25) internal successors, (149), 4 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:33,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:02:33,636 INFO L93 Difference]: Finished difference Result 1372 states and 2097 transitions. [2021-11-21 00:02:33,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:02:33,636 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 37.25) internal successors, (149), 4 states have internal predecessors, (149), 0 states have call successors, (0), 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 117 [2021-11-21 00:02:33,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:02:33,642 INFO L225 Difference]: With dead ends: 1372 [2021-11-21 00:02:33,642 INFO L226 Difference]: Without dead ends: 875 [2021-11-21 00:02:33,644 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 230 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:02:33,645 INFO L933 BasicCegarLoop]: 363 mSDtfsCounter, 297 mSDsluCounter, 364 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 297 SdHoareTripleChecker+Valid, 727 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:02:33,646 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [297 Valid, 727 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:02:33,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 875 states. [2021-11-21 00:02:33,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 875 to 875. [2021-11-21 00:02:33,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 875 states, 874 states have (on average 1.5183066361556063) internal successors, (1327), 874 states have internal predecessors, (1327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:33,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 875 states to 875 states and 1327 transitions. [2021-11-21 00:02:33,691 INFO L78 Accepts]: Start accepts. Automaton has 875 states and 1327 transitions. Word has length 117 [2021-11-21 00:02:33,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:02:33,692 INFO L470 AbstractCegarLoop]: Abstraction has 875 states and 1327 transitions. [2021-11-21 00:02:33,692 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 37.25) internal successors, (149), 4 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:33,692 INFO L276 IsEmpty]: Start isEmpty. Operand 875 states and 1327 transitions. [2021-11-21 00:02:33,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-21 00:02:33,697 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:02:33,698 INFO L514 BasicCegarLoop]: trace histogram [5, 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, 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] [2021-11-21 00:02:33,711 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:02:33,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:02:33,911 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:02:33,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:02:33,912 INFO L85 PathProgramCache]: Analyzing trace with hash -1505494372, now seen corresponding path program 1 times [2021-11-21 00:02:33,913 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:02:33,914 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1411019584] [2021-11-21 00:02:33,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:02:33,914 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:02:33,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:02:33,924 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:02:33,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-21 00:02:34,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:02:34,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:02:34,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:02:34,671 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 130 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-21 00:02:34,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:02:35,119 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 130 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-21 00:02:35,120 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:02:35,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1411019584] [2021-11-21 00:02:35,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1411019584] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:02:35,120 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:02:35,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-21 00:02:35,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614224160] [2021-11-21 00:02:35,121 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:02:35,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:02:35,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:02:35,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:02:35,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:02:35,123 INFO L87 Difference]: Start difference. First operand 875 states and 1327 transitions. Second operand has 4 states, 4 states have (on average 39.75) internal successors, (159), 4 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:35,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:02:35,401 INFO L93 Difference]: Finished difference Result 1860 states and 2833 transitions. [2021-11-21 00:02:35,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:02:35,402 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 39.75) internal successors, (159), 4 states have internal predecessors, (159), 0 states have call successors, (0), 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 146 [2021-11-21 00:02:35,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:02:35,409 INFO L225 Difference]: With dead ends: 1860 [2021-11-21 00:02:35,409 INFO L226 Difference]: Without dead ends: 1119 [2021-11-21 00:02:35,410 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 288 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:02:35,411 INFO L933 BasicCegarLoop]: 365 mSDtfsCounter, 306 mSDsluCounter, 360 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 306 SdHoareTripleChecker+Valid, 725 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:02:35,412 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [306 Valid, 725 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:02:35,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1119 states. [2021-11-21 00:02:35,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1119 to 1119. [2021-11-21 00:02:35,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1119 states, 1118 states have (on average 1.5143112701252237) internal successors, (1693), 1118 states have internal predecessors, (1693), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:35,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1119 states to 1119 states and 1693 transitions. [2021-11-21 00:02:35,457 INFO L78 Accepts]: Start accepts. Automaton has 1119 states and 1693 transitions. Word has length 146 [2021-11-21 00:02:35,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:02:35,458 INFO L470 AbstractCegarLoop]: Abstraction has 1119 states and 1693 transitions. [2021-11-21 00:02:35,458 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 39.75) internal successors, (159), 4 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:35,458 INFO L276 IsEmpty]: Start isEmpty. Operand 1119 states and 1693 transitions. [2021-11-21 00:02:35,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-21 00:02:35,462 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:02:35,462 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:02:35,482 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:02:35,675 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:02:35,676 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:02:35,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:02:35,676 INFO L85 PathProgramCache]: Analyzing trace with hash 1562257391, now seen corresponding path program 1 times [2021-11-21 00:02:35,677 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:02:35,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1037120078] [2021-11-21 00:02:35,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:02:35,677 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:02:35,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:02:35,678 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:02:35,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-21 00:02:36,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:02:36,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 416 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-21 00:02:36,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:02:36,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:02:36,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:02:36,376 INFO L354 Elim1Store]: treesize reduction 96, result has 16.5 percent of original size [2021-11-21 00:02:36,376 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 39 treesize of output 22 [2021-11-21 00:02:36,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:02:36,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:02:36,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:02:36,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 41 [2021-11-21 00:02:36,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:02:36,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 13 [2021-11-21 00:02:36,550 INFO L354 Elim1Store]: treesize reduction 33, result has 21.4 percent of original size [2021-11-21 00:02:36,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 13 [2021-11-21 00:02:36,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:02:36,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 13 [2021-11-21 00:02:36,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-21 00:02:36,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 10 [2021-11-21 00:02:37,128 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2021-11-21 00:02:37,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:02:37,927 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2021-11-21 00:02:37,928 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:02:37,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1037120078] [2021-11-21 00:02:37,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1037120078] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:02:37,928 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:02:37,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2021-11-21 00:02:37,929 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341577508] [2021-11-21 00:02:37,929 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:02:37,929 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:02:37,930 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:02:37,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:02:37,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:02:37,930 INFO L87 Difference]: Start difference. First operand 1119 states and 1693 transitions. Second operand has 8 states, 8 states have (on average 11.375) internal successors, (91), 8 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) [2021-11-21 00:02:39,950 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:02:41,960 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:02:44,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:02:44,575 INFO L93 Difference]: Finished difference Result 2235 states and 3382 transitions. [2021-11-21 00:02:44,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:02:44,577 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 11.375) internal successors, (91), 8 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 170 [2021-11-21 00:02:44,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:02:44,594 INFO L225 Difference]: With dead ends: 2235 [2021-11-21 00:02:44,594 INFO L226 Difference]: Without dead ends: 1119 [2021-11-21 00:02:44,595 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 331 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:02:44,596 INFO L933 BasicCegarLoop]: 206 mSDtfsCounter, 12 mSDsluCounter, 616 mSDsCounter, 0 mSdLazyCounter, 166 mSolverCounterSat, 1 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 822 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 166 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:02:44,597 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 822 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 166 Invalid, 2 Unknown, 59 Unchecked, 6.5s Time] [2021-11-21 00:02:44,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1119 states. [2021-11-21 00:02:44,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1119 to 1119. [2021-11-21 00:02:44,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1119 states, 1118 states have (on average 1.513416815742397) internal successors, (1692), 1118 states have internal predecessors, (1692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:44,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1119 states to 1119 states and 1692 transitions. [2021-11-21 00:02:44,641 INFO L78 Accepts]: Start accepts. Automaton has 1119 states and 1692 transitions. Word has length 170 [2021-11-21 00:02:44,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:02:44,641 INFO L470 AbstractCegarLoop]: Abstraction has 1119 states and 1692 transitions. [2021-11-21 00:02:44,642 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 11.375) internal successors, (91), 8 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) [2021-11-21 00:02:44,642 INFO L276 IsEmpty]: Start isEmpty. Operand 1119 states and 1692 transitions. [2021-11-21 00:02:44,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-21 00:02:44,646 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:02:44,646 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:02:44,666 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:02:44,862 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:02:44,863 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:02:44,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:02:44,863 INFO L85 PathProgramCache]: Analyzing trace with hash 872425901, now seen corresponding path program 1 times [2021-11-21 00:02:44,864 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:02:44,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [846017575] [2021-11-21 00:02:44,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:02:44,864 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:02:44,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:02:44,865 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:02:44,866 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-21 00:02:45,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:02:45,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 422 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:02:45,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:02:45,487 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:02:45,546 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:02:45,547 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:02:45,890 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:02:45,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:02:46,234 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 169 proven. 0 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-21 00:02:46,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:02:46,864 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 169 proven. 0 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-21 00:02:46,864 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:02:46,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [846017575] [2021-11-21 00:02:46,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [846017575] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:02:46,864 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:02:46,865 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-21 00:02:46,865 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742518877] [2021-11-21 00:02:46,865 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:02:46,865 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:02:46,866 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:02:46,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:02:46,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:02:46,866 INFO L87 Difference]: Start difference. First operand 1119 states and 1692 transitions. Second operand has 7 states, 7 states have (on average 19.857142857142858) internal successors, (139), 7 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:48,886 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:02:50,902 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:02:56,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:02:56,940 INFO L93 Difference]: Finished difference Result 4218 states and 6404 transitions. [2021-11-21 00:02:56,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:02:56,941 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 19.857142857142858) internal successors, (139), 7 states have internal predecessors, (139), 0 states have call successors, (0), 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 170 [2021-11-21 00:02:56,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:02:56,958 INFO L225 Difference]: With dead ends: 4218 [2021-11-21 00:02:56,959 INFO L226 Difference]: Without dead ends: 3109 [2021-11-21 00:02:56,961 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 332 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:02:56,962 INFO L933 BasicCegarLoop]: 195 mSDtfsCounter, 377 mSDsluCounter, 405 mSDsCounter, 0 mSdLazyCounter, 554 mSolverCounterSat, 86 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 377 SdHoareTripleChecker+Valid, 600 SdHoareTripleChecker+Invalid, 642 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 554 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:02:56,962 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [377 Valid, 600 Invalid, 642 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 554 Invalid, 2 Unknown, 0 Unchecked, 9.9s Time] [2021-11-21 00:02:56,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3109 states. [2021-11-21 00:02:57,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3109 to 1343. [2021-11-21 00:02:57,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1343 states, 1342 states have (on average 1.548435171385991) internal successors, (2078), 1342 states have internal predecessors, (2078), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:57,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1343 states to 1343 states and 2078 transitions. [2021-11-21 00:02:57,044 INFO L78 Accepts]: Start accepts. Automaton has 1343 states and 2078 transitions. Word has length 170 [2021-11-21 00:02:57,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:02:57,045 INFO L470 AbstractCegarLoop]: Abstraction has 1343 states and 2078 transitions. [2021-11-21 00:02:57,045 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 19.857142857142858) internal successors, (139), 7 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:57,045 INFO L276 IsEmpty]: Start isEmpty. Operand 1343 states and 2078 transitions. [2021-11-21 00:02:57,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-21 00:02:57,049 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:02:57,049 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:02:57,069 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:02:57,269 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:02:57,270 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:02:57,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:02:57,270 INFO L85 PathProgramCache]: Analyzing trace with hash 437920303, now seen corresponding path program 1 times [2021-11-21 00:02:57,271 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:02:57,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [109634744] [2021-11-21 00:02:57,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:02:57,271 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:02:57,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:02:57,272 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:02:57,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-21 00:02:57,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:02:57,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 422 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:02:57,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:02:57,864 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:02:57,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:02:58,194 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:02:58,194 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:02:58,361 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 159 proven. 0 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-21 00:02:58,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:02:58,798 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 159 proven. 0 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-21 00:02:58,798 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:02:58,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [109634744] [2021-11-21 00:02:58,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [109634744] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:02:58,799 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:02:58,799 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 5 [2021-11-21 00:02:58,799 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148059353] [2021-11-21 00:02:58,799 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:02:58,799 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:02:58,800 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:02:58,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:02:58,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:02:58,801 INFO L87 Difference]: Start difference. First operand 1343 states and 2078 transitions. Second operand has 5 states, 5 states have (on average 29.8) internal successors, (149), 5 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:00,812 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:03:03,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:03:03,425 INFO L93 Difference]: Finished difference Result 3248 states and 5026 transitions. [2021-11-21 00:03:03,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:03:03,430 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 29.8) internal successors, (149), 5 states have internal predecessors, (149), 0 states have call successors, (0), 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 170 [2021-11-21 00:03:03,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:03:03,441 INFO L225 Difference]: With dead ends: 3248 [2021-11-21 00:03:03,441 INFO L226 Difference]: Without dead ends: 1915 [2021-11-21 00:03:03,443 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 335 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:03:03,444 INFO L933 BasicCegarLoop]: 255 mSDtfsCounter, 110 mSDsluCounter, 360 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 18 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 615 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:03:03,444 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 615 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 221 Invalid, 1 Unknown, 0 Unchecked, 4.5s Time] [2021-11-21 00:03:03,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1915 states. [2021-11-21 00:03:03,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1915 to 1595. [2021-11-21 00:03:03,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1595 states, 1594 states have (on average 1.5803011292346298) internal successors, (2519), 1594 states have internal predecessors, (2519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:03,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1595 states to 1595 states and 2519 transitions. [2021-11-21 00:03:03,522 INFO L78 Accepts]: Start accepts. Automaton has 1595 states and 2519 transitions. Word has length 170 [2021-11-21 00:03:03,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:03:03,522 INFO L470 AbstractCegarLoop]: Abstraction has 1595 states and 2519 transitions. [2021-11-21 00:03:03,523 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 29.8) internal successors, (149), 5 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:03,523 INFO L276 IsEmpty]: Start isEmpty. Operand 1595 states and 2519 transitions. [2021-11-21 00:03:03,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2021-11-21 00:03:03,527 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:03:03,528 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:03:03,546 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:03:03,743 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:03:03,744 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:03:03,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:03:03,744 INFO L85 PathProgramCache]: Analyzing trace with hash 2089364194, now seen corresponding path program 1 times [2021-11-21 00:03:03,745 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:03:03,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [520648174] [2021-11-21 00:03:03,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:03:03,745 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:03:03,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:03:03,746 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:03:03,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-21 00:03:04,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:03:04,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:03:04,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:03:04,380 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:03:04,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:03:04,554 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:03:04,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:03:04,758 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 199 proven. 0 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2021-11-21 00:03:04,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:03:05,197 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 199 proven. 0 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2021-11-21 00:03:05,197 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:03:05,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [520648174] [2021-11-21 00:03:05,197 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [520648174] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:03:05,197 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:03:05,197 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-21 00:03:05,197 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368353329] [2021-11-21 00:03:05,197 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:03:05,198 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:03:05,198 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:03:05,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:03:05,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:03:05,198 INFO L87 Difference]: Start difference. First operand 1595 states and 2519 transitions. Second operand has 6 states, 6 states have (on average 21.5) internal successors, (129), 6 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:07,213 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:03:12,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:03:12,746 INFO L93 Difference]: Finished difference Result 4734 states and 7391 transitions. [2021-11-21 00:03:12,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:03:12,750 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.5) internal successors, (129), 6 states have internal predecessors, (129), 0 states have call successors, (0), 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 183 [2021-11-21 00:03:12,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:03:12,767 INFO L225 Difference]: With dead ends: 4734 [2021-11-21 00:03:12,767 INFO L226 Difference]: Without dead ends: 3149 [2021-11-21 00:03:12,770 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 366 GetRequests, 360 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:03:12,771 INFO L933 BasicCegarLoop]: 174 mSDtfsCounter, 214 mSDsluCounter, 393 mSDsCounter, 0 mSdLazyCounter, 482 mSolverCounterSat, 69 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 567 SdHoareTripleChecker+Invalid, 552 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 482 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:03:12,771 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [214 Valid, 567 Invalid, 552 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 482 Invalid, 1 Unknown, 0 Unchecked, 7.4s Time] [2021-11-21 00:03:12,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3149 states. [2021-11-21 00:03:12,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3149 to 1867. [2021-11-21 00:03:12,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1867 states, 1866 states have (on average 1.5819935691318328) internal successors, (2952), 1866 states have internal predecessors, (2952), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:12,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1867 states to 1867 states and 2952 transitions. [2021-11-21 00:03:12,896 INFO L78 Accepts]: Start accepts. Automaton has 1867 states and 2952 transitions. Word has length 183 [2021-11-21 00:03:12,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:03:12,897 INFO L470 AbstractCegarLoop]: Abstraction has 1867 states and 2952 transitions. [2021-11-21 00:03:12,897 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.5) internal successors, (129), 6 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:12,897 INFO L276 IsEmpty]: Start isEmpty. Operand 1867 states and 2952 transitions. [2021-11-21 00:03:12,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2021-11-21 00:03:12,903 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:03:12,903 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:03:12,924 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:03:13,118 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:03:13,118 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:03:13,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:03:13,119 INFO L85 PathProgramCache]: Analyzing trace with hash 1261495379, now seen corresponding path program 1 times [2021-11-21 00:03:13,119 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:03:13,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2064660240] [2021-11-21 00:03:13,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:03:13,120 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:03:13,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:03:13,121 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:03:13,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-21 00:03:13,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:03:13,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:03:13,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:03:13,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 109 treesize of output 73 [2021-11-21 00:03:13,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 49 [2021-11-21 00:03:14,401 INFO L354 Elim1Store]: treesize reduction 25, result has 45.7 percent of original size [2021-11-21 00:03:14,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 49 treesize of output 31 [2021-11-21 00:03:14,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-11-21 00:03:14,698 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 159 proven. 0 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2021-11-21 00:03:14,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:03:15,042 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 159 proven. 0 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2021-11-21 00:03:15,043 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:03:15,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2064660240] [2021-11-21 00:03:15,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2064660240] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:03:15,043 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:03:15,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-21 00:03:15,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035201900] [2021-11-21 00:03:15,043 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:03:15,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:03:15,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:03:15,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:03:15,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:03:15,045 INFO L87 Difference]: Start difference. First operand 1867 states and 2952 transitions. Second operand has 4 states, 4 states have (on average 31.0) internal successors, (124), 4 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:17,056 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:03:18,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:03:18,571 INFO L93 Difference]: Finished difference Result 3841 states and 6035 transitions. [2021-11-21 00:03:18,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:03:18,573 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 31.0) internal successors, (124), 4 states have internal predecessors, (124), 0 states have call successors, (0), 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 184 [2021-11-21 00:03:18,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:03:18,584 INFO L225 Difference]: With dead ends: 3841 [2021-11-21 00:03:18,584 INFO L226 Difference]: Without dead ends: 1984 [2021-11-21 00:03:18,587 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 364 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:03:18,597 INFO L933 BasicCegarLoop]: 216 mSDtfsCounter, 22 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 538 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:03:18,598 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 538 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 144 Invalid, 1 Unknown, 0 Unchecked, 3.5s Time] [2021-11-21 00:03:18,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1984 states. [2021-11-21 00:03:18,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1984 to 1867. [2021-11-21 00:03:18,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1867 states, 1866 states have (on average 1.5771704180064308) internal successors, (2943), 1866 states have internal predecessors, (2943), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:18,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1867 states to 1867 states and 2943 transitions. [2021-11-21 00:03:18,682 INFO L78 Accepts]: Start accepts. Automaton has 1867 states and 2943 transitions. Word has length 184 [2021-11-21 00:03:18,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:03:18,683 INFO L470 AbstractCegarLoop]: Abstraction has 1867 states and 2943 transitions. [2021-11-21 00:03:18,683 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 31.0) internal successors, (124), 4 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:18,683 INFO L276 IsEmpty]: Start isEmpty. Operand 1867 states and 2943 transitions. [2021-11-21 00:03:18,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2021-11-21 00:03:18,689 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:03:18,689 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:03:18,704 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (10)] Ended with exit code 0 [2021-11-21 00:03:18,904 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:03:18,904 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:03:18,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:03:18,905 INFO L85 PathProgramCache]: Analyzing trace with hash -2145835448, now seen corresponding path program 1 times [2021-11-21 00:03:18,906 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:03:18,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1274421315] [2021-11-21 00:03:18,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:03:18,906 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:03:18,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:03:18,907 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:03:18,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-21 00:03:19,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:03:19,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:03:19,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:03:19,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:03:19,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-11-21 00:03:19,626 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 185 proven. 0 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-21 00:03:19,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:03:20,063 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 185 proven. 0 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-21 00:03:20,063 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:03:20,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1274421315] [2021-11-21 00:03:20,063 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1274421315] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:03:20,063 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:03:20,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-21 00:03:20,063 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155018650] [2021-11-21 00:03:20,064 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:03:20,064 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:03:20,064 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:03:20,064 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:03:20,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:03:20,065 INFO L87 Difference]: Start difference. First operand 1867 states and 2943 transitions. Second operand has 6 states, 6 states have (on average 27.166666666666668) internal successors, (163), 6 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:22,078 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:03:28,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:03:28,976 INFO L93 Difference]: Finished difference Result 5764 states and 8984 transitions. [2021-11-21 00:03:28,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:03:28,976 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 27.166666666666668) internal successors, (163), 6 states have internal predecessors, (163), 0 states have call successors, (0), 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 184 [2021-11-21 00:03:28,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:03:28,995 INFO L225 Difference]: With dead ends: 5764 [2021-11-21 00:03:28,995 INFO L226 Difference]: Without dead ends: 3907 [2021-11-21 00:03:28,999 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 362 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:03:28,999 INFO L933 BasicCegarLoop]: 192 mSDtfsCounter, 220 mSDsluCounter, 587 mSDsCounter, 0 mSdLazyCounter, 714 mSolverCounterSat, 74 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 779 SdHoareTripleChecker+Invalid, 789 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 714 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:03:29,000 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [220 Valid, 779 Invalid, 789 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 714 Invalid, 1 Unknown, 0 Unchecked, 8.7s Time] [2021-11-21 00:03:29,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3907 states. [2021-11-21 00:03:29,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3907 to 2291. [2021-11-21 00:03:29,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2291 states, 2290 states have (on average 1.6200873362445414) internal successors, (3710), 2290 states have internal predecessors, (3710), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:29,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2291 states to 2291 states and 3710 transitions. [2021-11-21 00:03:29,127 INFO L78 Accepts]: Start accepts. Automaton has 2291 states and 3710 transitions. Word has length 184 [2021-11-21 00:03:29,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:03:29,127 INFO L470 AbstractCegarLoop]: Abstraction has 2291 states and 3710 transitions. [2021-11-21 00:03:29,128 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 27.166666666666668) internal successors, (163), 6 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:29,128 INFO L276 IsEmpty]: Start isEmpty. Operand 2291 states and 3710 transitions. [2021-11-21 00:03:29,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2021-11-21 00:03:29,134 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:03:29,134 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:03:29,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-21 00:03:29,349 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:03:29,350 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:03:29,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:03:29,350 INFO L85 PathProgramCache]: Analyzing trace with hash -1838454219, now seen corresponding path program 1 times [2021-11-21 00:03:29,350 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:03:29,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [405627052] [2021-11-21 00:03:29,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:03:29,351 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:03:29,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:03:29,352 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:03:29,402 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-21 00:03:29,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:03:29,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 450 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:03:29,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:03:29,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:03:29,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-11-21 00:03:30,106 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 185 proven. 0 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-21 00:03:30,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:03:30,552 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 185 proven. 0 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-21 00:03:30,552 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:03:30,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [405627052] [2021-11-21 00:03:30,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [405627052] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:03:30,552 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:03:30,552 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-21 00:03:30,552 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599720179] [2021-11-21 00:03:30,553 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:03:30,553 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:03:30,553 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:03:30,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:03:30,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:03:30,554 INFO L87 Difference]: Start difference. First operand 2291 states and 3710 transitions. Second operand has 6 states, 6 states have (on average 27.5) internal successors, (165), 6 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:32,564 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:03:38,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:03:38,965 INFO L93 Difference]: Finished difference Result 6274 states and 9945 transitions. [2021-11-21 00:03:38,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:03:38,967 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 27.5) internal successors, (165), 6 states have internal predecessors, (165), 0 states have call successors, (0), 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 185 [2021-11-21 00:03:38,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:03:38,986 INFO L225 Difference]: With dead ends: 6274 [2021-11-21 00:03:38,986 INFO L226 Difference]: Without dead ends: 3993 [2021-11-21 00:03:38,989 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 364 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:03:38,990 INFO L933 BasicCegarLoop]: 194 mSDtfsCounter, 206 mSDsluCounter, 591 mSDsCounter, 0 mSdLazyCounter, 704 mSolverCounterSat, 74 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 785 SdHoareTripleChecker+Invalid, 779 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 704 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:03:38,990 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [206 Valid, 785 Invalid, 779 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 704 Invalid, 1 Unknown, 0 Unchecked, 8.2s Time] [2021-11-21 00:03:38,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3993 states. [2021-11-21 00:03:39,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3993 to 2435. [2021-11-21 00:03:39,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2435 states, 2434 states have (on average 1.6388660640920296) internal successors, (3989), 2434 states have internal predecessors, (3989), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:39,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2435 states to 2435 states and 3989 transitions. [2021-11-21 00:03:39,130 INFO L78 Accepts]: Start accepts. Automaton has 2435 states and 3989 transitions. Word has length 185 [2021-11-21 00:03:39,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:03:39,131 INFO L470 AbstractCegarLoop]: Abstraction has 2435 states and 3989 transitions. [2021-11-21 00:03:39,131 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 27.5) internal successors, (165), 6 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:39,131 INFO L276 IsEmpty]: Start isEmpty. Operand 2435 states and 3989 transitions. [2021-11-21 00:03:39,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2021-11-21 00:03:39,137 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:03:39,137 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:03:39,161 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-21 00:03:39,355 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:03:39,356 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:03:39,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:03:39,356 INFO L85 PathProgramCache]: Analyzing trace with hash -890957938, now seen corresponding path program 1 times [2021-11-21 00:03:39,357 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:03:39,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1768298304] [2021-11-21 00:03:39,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:03:39,357 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:03:39,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:03:39,358 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:03:39,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-21 00:03:39,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:03:39,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:03:39,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:03:39,741 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:03:39,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-11-21 00:03:40,087 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 293 proven. 0 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-21 00:03:40,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:03:40,590 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 293 proven. 0 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-21 00:03:40,590 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:03:40,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1768298304] [2021-11-21 00:03:40,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1768298304] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:03:40,590 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:03:40,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-21 00:03:40,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146143090] [2021-11-21 00:03:40,590 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:03:40,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:03:40,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:03:40,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:03:40,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:03:40,591 INFO L87 Difference]: Start difference. First operand 2435 states and 3989 transitions. Second operand has 6 states, 6 states have (on average 27.166666666666668) internal successors, (163), 6 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:42,604 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:03:47,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:03:47,918 INFO L93 Difference]: Finished difference Result 7075 states and 11412 transitions. [2021-11-21 00:03:47,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:03:47,918 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 27.166666666666668) internal successors, (163), 6 states have internal predecessors, (163), 0 states have call successors, (0), 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 213 [2021-11-21 00:03:47,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:03:47,940 INFO L225 Difference]: With dead ends: 7075 [2021-11-21 00:03:47,940 INFO L226 Difference]: Without dead ends: 4650 [2021-11-21 00:03:47,943 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 420 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:03:47,943 INFO L933 BasicCegarLoop]: 190 mSDtfsCounter, 218 mSDsluCounter, 401 mSDsCounter, 0 mSdLazyCounter, 526 mSolverCounterSat, 59 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 591 SdHoareTripleChecker+Invalid, 586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 526 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:03:47,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [218 Valid, 591 Invalid, 586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 526 Invalid, 1 Unknown, 0 Unchecked, 7.1s Time] [2021-11-21 00:03:47,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4650 states. [2021-11-21 00:03:48,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4650 to 3011. [2021-11-21 00:03:48,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3011 states, 3010 states have (on average 1.6601328903654484) internal successors, (4997), 3010 states have internal predecessors, (4997), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:48,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3011 states to 3011 states and 4997 transitions. [2021-11-21 00:03:48,107 INFO L78 Accepts]: Start accepts. Automaton has 3011 states and 4997 transitions. Word has length 213 [2021-11-21 00:03:48,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:03:48,108 INFO L470 AbstractCegarLoop]: Abstraction has 3011 states and 4997 transitions. [2021-11-21 00:03:48,108 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 27.166666666666668) internal successors, (163), 6 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:48,108 INFO L276 IsEmpty]: Start isEmpty. Operand 3011 states and 4997 transitions. [2021-11-21 00:03:48,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2021-11-21 00:03:48,115 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:03:48,115 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:03:48,137 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-21 00:03:48,330 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:03:48,331 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:03:48,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:03:48,331 INFO L85 PathProgramCache]: Analyzing trace with hash 1720944718, now seen corresponding path program 1 times [2021-11-21 00:03:48,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:03:48,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1767031080] [2021-11-21 00:03:48,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:03:48,332 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:03:48,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:03:48,333 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:03:48,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-21 00:03:48,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:03:48,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 510 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:03:48,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:03:49,013 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:03:49,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:03:49,210 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:03:49,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:03:49,520 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 285 proven. 0 refuted. 0 times theorem prover too weak. 159 trivial. 0 not checked. [2021-11-21 00:03:49,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:03:50,069 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 285 proven. 0 refuted. 0 times theorem prover too weak. 159 trivial. 0 not checked. [2021-11-21 00:03:50,069 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:03:50,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1767031080] [2021-11-21 00:03:50,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1767031080] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:03:50,069 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:03:50,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-21 00:03:50,070 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441263467] [2021-11-21 00:03:50,070 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:03:50,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:03:50,070 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:03:50,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:03:50,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:03:50,071 INFO L87 Difference]: Start difference. First operand 3011 states and 4997 transitions. Second operand has 6 states, 6 states have (on average 22.333333333333332) internal successors, (134), 6 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:52,088 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:03:59,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:03:59,138 INFO L93 Difference]: Finished difference Result 6996 states and 11319 transitions. [2021-11-21 00:03:59,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:03:59,139 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 22.333333333333332) internal successors, (134), 6 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 213 [2021-11-21 00:03:59,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:03:59,147 INFO L225 Difference]: With dead ends: 6996 [2021-11-21 00:03:59,147 INFO L226 Difference]: Without dead ends: 3995 [2021-11-21 00:03:59,150 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 420 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:03:59,151 INFO L933 BasicCegarLoop]: 159 mSDtfsCounter, 210 mSDsluCounter, 520 mSDsCounter, 0 mSdLazyCounter, 612 mSolverCounterSat, 70 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 679 SdHoareTripleChecker+Invalid, 683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 612 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:03:59,151 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 679 Invalid, 683 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 612 Invalid, 1 Unknown, 0 Unchecked, 8.9s Time] [2021-11-21 00:03:59,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3995 states. [2021-11-21 00:03:59,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3995 to 3011. [2021-11-21 00:03:59,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3011 states, 3010 states have (on average 1.6425249169435217) internal successors, (4944), 3010 states have internal predecessors, (4944), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:59,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3011 states to 3011 states and 4944 transitions. [2021-11-21 00:03:59,302 INFO L78 Accepts]: Start accepts. Automaton has 3011 states and 4944 transitions. Word has length 213 [2021-11-21 00:03:59,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:03:59,302 INFO L470 AbstractCegarLoop]: Abstraction has 3011 states and 4944 transitions. [2021-11-21 00:03:59,303 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 22.333333333333332) internal successors, (134), 6 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:03:59,303 INFO L276 IsEmpty]: Start isEmpty. Operand 3011 states and 4944 transitions. [2021-11-21 00:03:59,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2021-11-21 00:03:59,310 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:03:59,310 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 6, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:03:59,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-21 00:03:59,526 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:03:59,527 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:03:59,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:03:59,527 INFO L85 PathProgramCache]: Analyzing trace with hash 1408617075, now seen corresponding path program 1 times [2021-11-21 00:03:59,528 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:03:59,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1916195492] [2021-11-21 00:03:59,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:03:59,528 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:03:59,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:03:59,530 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:03:59,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-21 00:03:59,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:03:59,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 516 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:03:59,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:04:00,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:04:00,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-11-21 00:04:00,521 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 298 proven. 0 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-21 00:04:00,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:04:01,070 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 298 proven. 0 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-21 00:04:01,071 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:04:01,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1916195492] [2021-11-21 00:04:01,071 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1916195492] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:04:01,071 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:04:01,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-21 00:04:01,072 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697698796] [2021-11-21 00:04:01,072 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:04:01,073 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:04:01,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:04:01,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:04:01,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:04:01,074 INFO L87 Difference]: Start difference. First operand 3011 states and 4944 transitions. Second operand has 6 states, 6 states have (on average 28.833333333333332) internal successors, (173), 6 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:04:03,094 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:04:11,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:04:11,117 INFO L93 Difference]: Finished difference Result 7885 states and 12665 transitions. [2021-11-21 00:04:11,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:04:11,118 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 28.833333333333332) internal successors, (173), 6 states have internal predecessors, (173), 0 states have call successors, (0), 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 218 [2021-11-21 00:04:11,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:04:11,127 INFO L225 Difference]: With dead ends: 7885 [2021-11-21 00:04:11,127 INFO L226 Difference]: Without dead ends: 4884 [2021-11-21 00:04:11,130 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 436 GetRequests, 430 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:04:11,130 INFO L933 BasicCegarLoop]: 180 mSDtfsCounter, 206 mSDsluCounter, 567 mSDsCounter, 0 mSdLazyCounter, 693 mSolverCounterSat, 69 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 747 SdHoareTripleChecker+Invalid, 763 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 693 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:04:11,131 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [206 Valid, 747 Invalid, 763 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 693 Invalid, 1 Unknown, 0 Unchecked, 9.8s Time] [2021-11-21 00:04:11,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4884 states. [2021-11-21 00:04:11,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4884 to 3344. [2021-11-21 00:04:11,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3344 states, 3343 states have (on average 1.6485192940472628) internal successors, (5511), 3343 states have internal predecessors, (5511), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:04:11,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3344 states to 3344 states and 5511 transitions. [2021-11-21 00:04:11,283 INFO L78 Accepts]: Start accepts. Automaton has 3344 states and 5511 transitions. Word has length 218 [2021-11-21 00:04:11,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:04:11,284 INFO L470 AbstractCegarLoop]: Abstraction has 3344 states and 5511 transitions. [2021-11-21 00:04:11,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 28.833333333333332) internal successors, (173), 6 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:04:11,284 INFO L276 IsEmpty]: Start isEmpty. Operand 3344 states and 5511 transitions. [2021-11-21 00:04:11,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2021-11-21 00:04:11,292 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:04:11,292 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 6, 6, 6, 5, 5, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:04:11,310 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-21 00:04:11,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:04:11,507 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:04:11,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:04:11,508 INFO L85 PathProgramCache]: Analyzing trace with hash -617581952, now seen corresponding path program 1 times [2021-11-21 00:04:11,509 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:04:11,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1646971546] [2021-11-21 00:04:11,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:04:11,509 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:04:11,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:04:11,511 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:04:11,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-21 00:04:11,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:04:11,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:04:11,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:04:11,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:04:12,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-11-21 00:04:12,350 INFO L134 CoverageAnalysis]: Checked inductivity of 457 backedges. 299 proven. 0 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-21 00:04:12,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:04:12,929 INFO L134 CoverageAnalysis]: Checked inductivity of 457 backedges. 299 proven. 0 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-21 00:04:12,929 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:04:12,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1646971546] [2021-11-21 00:04:12,929 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1646971546] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:04:12,929 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:04:12,929 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-21 00:04:12,929 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121656580] [2021-11-21 00:04:12,930 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:04:12,930 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:04:12,930 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:04:12,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:04:12,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:04:12,931 INFO L87 Difference]: Start difference. First operand 3344 states and 5511 transitions. Second operand has 6 states, 6 states have (on average 29.166666666666668) internal successors, (175), 6 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:04:14,944 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:04:20,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:04:20,409 INFO L93 Difference]: Finished difference Result 8173 states and 13151 transitions. [2021-11-21 00:04:20,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:04:20,409 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 29.166666666666668) internal successors, (175), 6 states have internal predecessors, (175), 0 states have call successors, (0), 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 219 [2021-11-21 00:04:20,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:04:20,419 INFO L225 Difference]: With dead ends: 8173 [2021-11-21 00:04:20,420 INFO L226 Difference]: Without dead ends: 4839 [2021-11-21 00:04:20,423 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 432 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:04:20,423 INFO L933 BasicCegarLoop]: 179 mSDtfsCounter, 202 mSDsluCounter, 389 mSDsCounter, 0 mSdLazyCounter, 520 mSolverCounterSat, 71 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 202 SdHoareTripleChecker+Valid, 568 SdHoareTripleChecker+Invalid, 592 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 520 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:04:20,424 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [202 Valid, 568 Invalid, 592 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 520 Invalid, 1 Unknown, 0 Unchecked, 7.2s Time] [2021-11-21 00:04:20,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4839 states. [2021-11-21 00:04:20,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4839 to 3344. [2021-11-21 00:04:20,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3344 states, 3343 states have (on average 1.6431349087645828) internal successors, (5493), 3343 states have internal predecessors, (5493), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:04:20,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3344 states to 3344 states and 5493 transitions. [2021-11-21 00:04:20,607 INFO L78 Accepts]: Start accepts. Automaton has 3344 states and 5493 transitions. Word has length 219 [2021-11-21 00:04:20,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:04:20,608 INFO L470 AbstractCegarLoop]: Abstraction has 3344 states and 5493 transitions. [2021-11-21 00:04:20,609 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 29.166666666666668) internal successors, (175), 6 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:04:20,609 INFO L276 IsEmpty]: Start isEmpty. Operand 3344 states and 5493 transitions. [2021-11-21 00:04:20,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2021-11-21 00:04:20,615 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:04:20,616 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:04:20,633 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-21 00:04:20,833 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:04:20,833 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:04:20,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:04:20,833 INFO L85 PathProgramCache]: Analyzing trace with hash -944071080, now seen corresponding path program 1 times [2021-11-21 00:04:20,834 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:04:20,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [759862544] [2021-11-21 00:04:20,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:04:20,834 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:04:20,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:04:20,835 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:04:20,837 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-21 00:04:21,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:04:21,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:04:21,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:04:21,581 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:04:21,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:04:21,745 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:04:21,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:04:22,179 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 290 proven. 0 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-21 00:04:22,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:04:22,803 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 290 proven. 0 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-21 00:04:22,804 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:04:22,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [759862544] [2021-11-21 00:04:22,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [759862544] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:04:22,824 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:04:22,824 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-21 00:04:22,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767700886] [2021-11-21 00:04:22,824 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:04:22,825 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:04:22,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:04:22,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:04:22,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:04:22,826 INFO L87 Difference]: Start difference. First operand 3344 states and 5493 transitions. Second operand has 6 states, 6 states have (on average 21.833333333333332) internal successors, (131), 6 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:04:24,842 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:04:30,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:04:30,871 INFO L93 Difference]: Finished difference Result 7644 states and 12293 transitions. [2021-11-21 00:04:30,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:04:30,872 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.833333333333332) internal successors, (131), 6 states have internal predecessors, (131), 0 states have call successors, (0), 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 226 [2021-11-21 00:04:30,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:04:30,880 INFO L225 Difference]: With dead ends: 7644 [2021-11-21 00:04:30,880 INFO L226 Difference]: Without dead ends: 4310 [2021-11-21 00:04:30,883 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 446 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:04:30,884 INFO L933 BasicCegarLoop]: 160 mSDtfsCounter, 219 mSDsluCounter, 520 mSDsCounter, 0 mSdLazyCounter, 605 mSolverCounterSat, 68 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 680 SdHoareTripleChecker+Invalid, 674 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 605 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:04:30,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [219 Valid, 680 Invalid, 674 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 605 Invalid, 1 Unknown, 0 Unchecked, 7.8s Time] [2021-11-21 00:04:30,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4310 states. [2021-11-21 00:04:31,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4310 to 3344. [2021-11-21 00:04:31,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3344 states, 3343 states have (on average 1.6218965001495662) internal successors, (5422), 3343 states have internal predecessors, (5422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:04:31,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3344 states to 3344 states and 5422 transitions. [2021-11-21 00:04:31,072 INFO L78 Accepts]: Start accepts. Automaton has 3344 states and 5422 transitions. Word has length 226 [2021-11-21 00:04:31,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:04:31,073 INFO L470 AbstractCegarLoop]: Abstraction has 3344 states and 5422 transitions. [2021-11-21 00:04:31,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.833333333333332) internal successors, (131), 6 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:04:31,073 INFO L276 IsEmpty]: Start isEmpty. Operand 3344 states and 5422 transitions. [2021-11-21 00:04:31,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2021-11-21 00:04:31,080 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:04:31,080 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:04:31,102 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-21 00:04:31,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:04:31,303 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:04:31,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:04:31,303 INFO L85 PathProgramCache]: Analyzing trace with hash -1891140284, now seen corresponding path program 1 times [2021-11-21 00:04:31,304 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:04:31,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1935363078] [2021-11-21 00:04:31,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:04:31,304 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:04:31,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:04:31,305 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:04:31,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-21 00:04:31,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:04:31,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 542 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:04:31,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:04:32,073 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:04:32,074 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:04:32,175 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:04:32,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:04:32,520 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 298 proven. 0 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-21 00:04:32,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:04:33,056 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 298 proven. 0 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-21 00:04:33,056 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:04:33,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1935363078] [2021-11-21 00:04:33,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1935363078] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:04:33,056 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:04:33,056 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-21 00:04:33,056 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260989606] [2021-11-21 00:04:33,057 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:04:33,057 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:04:33,057 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:04:33,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:04:33,058 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:04:33,058 INFO L87 Difference]: Start difference. First operand 3344 states and 5422 transitions. Second operand has 6 states, 6 states have (on average 22.0) internal successors, (132), 6 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:04:35,090 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:04:40,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:04:40,383 INFO L93 Difference]: Finished difference Result 7644 states and 12151 transitions. [2021-11-21 00:04:40,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:04:40,384 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 22.0) internal successors, (132), 6 states have internal predecessors, (132), 0 states have call successors, (0), 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 226 [2021-11-21 00:04:40,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:04:40,393 INFO L225 Difference]: With dead ends: 7644 [2021-11-21 00:04:40,393 INFO L226 Difference]: Without dead ends: 4310 [2021-11-21 00:04:40,396 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 446 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:04:40,397 INFO L933 BasicCegarLoop]: 159 mSDtfsCounter, 215 mSDsluCounter, 360 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 68 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 215 SdHoareTripleChecker+Valid, 519 SdHoareTripleChecker+Invalid, 531 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:04:40,397 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [215 Valid, 519 Invalid, 531 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 462 Invalid, 1 Unknown, 0 Unchecked, 7.1s Time] [2021-11-21 00:04:40,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4310 states. [2021-11-21 00:04:40,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4310 to 3344. [2021-11-21 00:04:40,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3344 states, 3343 states have (on average 1.6006580915345499) internal successors, (5351), 3343 states have internal predecessors, (5351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:04:40,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3344 states to 3344 states and 5351 transitions. [2021-11-21 00:04:40,584 INFO L78 Accepts]: Start accepts. Automaton has 3344 states and 5351 transitions. Word has length 226 [2021-11-21 00:04:40,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:04:40,585 INFO L470 AbstractCegarLoop]: Abstraction has 3344 states and 5351 transitions. [2021-11-21 00:04:40,585 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 22.0) internal successors, (132), 6 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:04:40,585 INFO L276 IsEmpty]: Start isEmpty. Operand 3344 states and 5351 transitions. [2021-11-21 00:04:40,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2021-11-21 00:04:40,591 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:04:40,591 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 7, 7, 7, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:04:40,612 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-21 00:04:40,808 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:04:40,809 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:04:40,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:04:40,809 INFO L85 PathProgramCache]: Analyzing trace with hash 2065291294, now seen corresponding path program 1 times [2021-11-21 00:04:40,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:04:40,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [728405325] [2021-11-21 00:04:40,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:04:40,810 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:04:40,810 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:04:40,811 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:04:40,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-21 00:04:41,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:04:41,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:04:41,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:04:41,562 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:04:41,562 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:04:41,681 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:04:41,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:04:42,058 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 306 proven. 0 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-21 00:04:42,058 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:04:42,629 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 306 proven. 0 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-21 00:04:42,629 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:04:42,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [728405325] [2021-11-21 00:04:42,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [728405325] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:04:42,629 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:04:42,629 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-21 00:04:42,630 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69236348] [2021-11-21 00:04:42,630 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:04:42,630 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:04:42,630 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:04:42,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:04:42,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:04:42,631 INFO L87 Difference]: Start difference. First operand 3344 states and 5351 transitions. Second operand has 6 states, 6 states have (on average 22.333333333333332) internal successors, (134), 6 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:04:44,653 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:04:48,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:04:48,792 INFO L93 Difference]: Finished difference Result 7644 states and 12009 transitions. [2021-11-21 00:04:48,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:04:48,793 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 22.333333333333332) internal successors, (134), 6 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 227 [2021-11-21 00:04:48,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:04:48,796 INFO L225 Difference]: With dead ends: 7644 [2021-11-21 00:04:48,796 INFO L226 Difference]: Without dead ends: 4310 [2021-11-21 00:04:48,798 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 454 GetRequests, 448 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:04:48,799 INFO L933 BasicCegarLoop]: 157 mSDtfsCounter, 211 mSDsluCounter, 357 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 68 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 514 SdHoareTripleChecker+Invalid, 531 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:04:48,799 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 514 Invalid, 531 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 462 Invalid, 1 Unknown, 0 Unchecked, 5.9s Time] [2021-11-21 00:04:48,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4310 states. [2021-11-21 00:04:48,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4310 to 3344. [2021-11-21 00:04:48,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3344 states, 3343 states have (on average 1.5794196829195333) internal successors, (5280), 3343 states have internal predecessors, (5280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:04:48,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3344 states to 3344 states and 5280 transitions. [2021-11-21 00:04:48,969 INFO L78 Accepts]: Start accepts. Automaton has 3344 states and 5280 transitions. Word has length 227 [2021-11-21 00:04:48,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:04:48,970 INFO L470 AbstractCegarLoop]: Abstraction has 3344 states and 5280 transitions. [2021-11-21 00:04:48,970 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 22.333333333333332) internal successors, (134), 6 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:04:48,970 INFO L276 IsEmpty]: Start isEmpty. Operand 3344 states and 5280 transitions. [2021-11-21 00:04:48,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2021-11-21 00:04:48,976 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:04:48,976 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 6, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:04:48,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-21 00:04:49,182 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:04:49,182 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:04:49,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:04:49,183 INFO L85 PathProgramCache]: Analyzing trace with hash 1825898945, now seen corresponding path program 1 times [2021-11-21 00:04:49,183 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:04:49,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [18478873] [2021-11-21 00:04:49,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:04:49,184 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:04:49,184 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:04:49,184 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:04:49,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-21 00:04:49,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:04:49,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 535 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:04:49,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:04:49,589 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:04:49,819 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-11-21 00:04:50,031 INFO L134 CoverageAnalysis]: Checked inductivity of 458 backedges. 300 proven. 0 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-21 00:04:50,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:04:50,613 INFO L134 CoverageAnalysis]: Checked inductivity of 458 backedges. 300 proven. 0 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-21 00:04:50,613 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:04:50,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [18478873] [2021-11-21 00:04:50,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [18478873] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:04:50,613 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:04:50,614 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-21 00:04:50,614 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840619842] [2021-11-21 00:04:50,614 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:04:50,614 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:04:50,614 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:04:50,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:04:50,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:04:50,615 INFO L87 Difference]: Start difference. First operand 3344 states and 5280 transitions. Second operand has 6 states, 6 states have (on average 31.333333333333332) internal successors, (188), 6 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:04:52,629 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:04:54,639 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:05:00,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:05:00,106 INFO L93 Difference]: Finished difference Result 8475 states and 13147 transitions. [2021-11-21 00:05:00,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:05:00,107 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 31.333333333333332) internal successors, (188), 6 states have internal predecessors, (188), 0 states have call successors, (0), 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 227 [2021-11-21 00:05:00,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:05:00,112 INFO L225 Difference]: With dead ends: 8475 [2021-11-21 00:05:00,112 INFO L226 Difference]: Without dead ends: 5141 [2021-11-21 00:05:00,114 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 454 GetRequests, 448 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:05:00,115 INFO L933 BasicCegarLoop]: 166 mSDtfsCounter, 183 mSDsluCounter, 377 mSDsCounter, 0 mSdLazyCounter, 509 mSolverCounterSat, 68 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 543 SdHoareTripleChecker+Invalid, 579 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 509 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:05:00,115 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [183 Valid, 543 Invalid, 579 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 509 Invalid, 2 Unknown, 0 Unchecked, 9.2s Time] [2021-11-21 00:05:00,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5141 states. [2021-11-21 00:05:00,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5141 to 3691. [2021-11-21 00:05:00,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3691 states, 3690 states have (on average 1.5818428184281843) internal successors, (5837), 3690 states have internal predecessors, (5837), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:05:00,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3691 states to 3691 states and 5837 transitions. [2021-11-21 00:05:00,320 INFO L78 Accepts]: Start accepts. Automaton has 3691 states and 5837 transitions. Word has length 227 [2021-11-21 00:05:00,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:05:00,321 INFO L470 AbstractCegarLoop]: Abstraction has 3691 states and 5837 transitions. [2021-11-21 00:05:00,321 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 31.333333333333332) internal successors, (188), 6 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:05:00,321 INFO L276 IsEmpty]: Start isEmpty. Operand 3691 states and 5837 transitions. [2021-11-21 00:05:00,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2021-11-21 00:05:00,328 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:05:00,328 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 6, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:05:00,350 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-21 00:05:00,543 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:05:00,544 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:05:00,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:05:00,544 INFO L85 PathProgramCache]: Analyzing trace with hash -2002314636, now seen corresponding path program 1 times [2021-11-21 00:05:00,545 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:05:00,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1939220768] [2021-11-21 00:05:00,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:05:00,545 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:05:00,545 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:05:00,546 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:05:00,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-21 00:05:00,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:05:00,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 537 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:05:00,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:05:01,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:05:01,312 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-11-21 00:05:01,515 INFO L134 CoverageAnalysis]: Checked inductivity of 458 backedges. 300 proven. 0 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-21 00:05:01,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:05:02,145 INFO L134 CoverageAnalysis]: Checked inductivity of 458 backedges. 300 proven. 0 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-21 00:05:02,146 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:05:02,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1939220768] [2021-11-21 00:05:02,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1939220768] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:05:02,146 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:05:02,146 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-21 00:05:02,146 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100499337] [2021-11-21 00:05:02,146 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:05:02,147 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:05:02,147 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:05:02,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:05:02,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:05:02,148 INFO L87 Difference]: Start difference. First operand 3691 states and 5837 transitions. Second operand has 6 states, 6 states have (on average 31.666666666666668) internal successors, (190), 6 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:05:04,186 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:05:08,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:05:08,752 INFO L93 Difference]: Finished difference Result 8816 states and 13699 transitions. [2021-11-21 00:05:08,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:05:08,753 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 31.666666666666668) internal successors, (190), 6 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 228 [2021-11-21 00:05:08,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:05:08,759 INFO L225 Difference]: With dead ends: 8816 [2021-11-21 00:05:08,760 INFO L226 Difference]: Without dead ends: 5099 [2021-11-21 00:05:08,763 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 450 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:05:08,764 INFO L933 BasicCegarLoop]: 172 mSDtfsCounter, 189 mSDsluCounter, 371 mSDsCounter, 0 mSdLazyCounter, 500 mSolverCounterSat, 68 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 543 SdHoareTripleChecker+Invalid, 569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 500 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:05:08,764 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [189 Valid, 543 Invalid, 569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 500 Invalid, 1 Unknown, 0 Unchecked, 6.3s Time] [2021-11-21 00:05:08,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5099 states. [2021-11-21 00:05:08,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5099 to 3706. [2021-11-21 00:05:08,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3706 states, 3705 states have (on average 1.5813765182186235) internal successors, (5859), 3705 states have internal predecessors, (5859), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:05:08,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3706 states to 3706 states and 5859 transitions. [2021-11-21 00:05:08,981 INFO L78 Accepts]: Start accepts. Automaton has 3706 states and 5859 transitions. Word has length 228 [2021-11-21 00:05:08,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:05:08,981 INFO L470 AbstractCegarLoop]: Abstraction has 3706 states and 5859 transitions. [2021-11-21 00:05:08,982 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 31.666666666666668) internal successors, (190), 6 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:05:08,982 INFO L276 IsEmpty]: Start isEmpty. Operand 3706 states and 5859 transitions. [2021-11-21 00:05:08,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2021-11-21 00:05:08,988 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:05:08,988 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 7, 7, 7, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:05:09,007 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-21 00:05:09,207 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:05:09,207 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:05:09,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:05:09,208 INFO L85 PathProgramCache]: Analyzing trace with hash 1477047327, now seen corresponding path program 1 times [2021-11-21 00:05:09,209 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:05:09,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1544087705] [2021-11-21 00:05:09,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:05:09,209 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:05:09,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:05:09,210 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:05:09,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-21 00:05:09,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:05:09,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:05:09,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:05:09,908 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:05:09,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:05:10,028 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:05:10,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:05:10,357 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 314 proven. 0 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-21 00:05:10,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:05:10,934 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 314 proven. 0 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-21 00:05:10,935 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:05:10,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1544087705] [2021-11-21 00:05:10,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1544087705] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:05:10,935 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:05:10,935 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-21 00:05:10,935 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871949506] [2021-11-21 00:05:10,935 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:05:10,936 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:05:10,936 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:05:10,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:05:10,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:05:10,937 INFO L87 Difference]: Start difference. First operand 3706 states and 5859 transitions. Second operand has 6 states, 6 states have (on average 22.666666666666668) internal successors, (136), 6 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:05:12,954 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:05:18,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:05:18,547 INFO L93 Difference]: Finished difference Result 8329 states and 12959 transitions. [2021-11-21 00:05:18,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:05:18,548 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 22.666666666666668) internal successors, (136), 6 states have internal predecessors, (136), 0 states have call successors, (0), 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 228 [2021-11-21 00:05:18,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:05:18,552 INFO L225 Difference]: With dead ends: 8329 [2021-11-21 00:05:18,552 INFO L226 Difference]: Without dead ends: 4633 [2021-11-21 00:05:18,555 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 450 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:05:18,555 INFO L933 BasicCegarLoop]: 167 mSDtfsCounter, 205 mSDsluCounter, 548 mSDsCounter, 0 mSdLazyCounter, 610 mSolverCounterSat, 66 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 715 SdHoareTripleChecker+Invalid, 677 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 610 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:05:18,555 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [205 Valid, 715 Invalid, 677 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 610 Invalid, 1 Unknown, 0 Unchecked, 7.3s Time] [2021-11-21 00:05:18,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4633 states. [2021-11-21 00:05:18,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4633 to 3706. [2021-11-21 00:05:18,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3706 states, 3705 states have (on average 1.5600539811066128) internal successors, (5780), 3705 states have internal predecessors, (5780), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:05:18,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3706 states to 3706 states and 5780 transitions. [2021-11-21 00:05:18,709 INFO L78 Accepts]: Start accepts. Automaton has 3706 states and 5780 transitions. Word has length 228 [2021-11-21 00:05:18,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:05:18,709 INFO L470 AbstractCegarLoop]: Abstraction has 3706 states and 5780 transitions. [2021-11-21 00:05:18,709 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 22.666666666666668) internal successors, (136), 6 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:05:18,710 INFO L276 IsEmpty]: Start isEmpty. Operand 3706 states and 5780 transitions. [2021-11-21 00:05:18,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2021-11-21 00:05:18,716 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:05:18,716 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 7, 7, 7, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:05:18,734 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-21 00:05:18,934 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:05:18,934 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:05:18,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:05:18,935 INFO L85 PathProgramCache]: Analyzing trace with hash 1737782233, now seen corresponding path program 1 times [2021-11-21 00:05:18,935 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:05:18,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [433776066] [2021-11-21 00:05:18,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:05:18,936 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:05:18,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:05:18,936 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:05:18,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-21 00:05:19,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:05:19,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:05:19,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:05:19,718 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:05:19,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:05:19,903 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:05:19,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:05:20,289 INFO L134 CoverageAnalysis]: Checked inductivity of 514 backedges. 322 proven. 0 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-21 00:05:20,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:05:20,910 INFO L134 CoverageAnalysis]: Checked inductivity of 514 backedges. 322 proven. 0 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-21 00:05:20,910 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:05:20,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [433776066] [2021-11-21 00:05:20,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [433776066] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:05:20,910 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:05:20,910 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-21 00:05:20,911 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947793703] [2021-11-21 00:05:20,911 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:05:20,911 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:05:20,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:05:20,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:05:20,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:05:20,912 INFO L87 Difference]: Start difference. First operand 3706 states and 5780 transitions. Second operand has 6 states, 6 states have (on average 23.0) internal successors, (138), 6 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:05:22,928 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:05:24,936 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:05:30,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:05:30,223 INFO L93 Difference]: Finished difference Result 8149 states and 12567 transitions. [2021-11-21 00:05:30,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:05:30,224 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 23.0) internal successors, (138), 6 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 229 [2021-11-21 00:05:30,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:05:30,228 INFO L225 Difference]: With dead ends: 8149 [2021-11-21 00:05:30,228 INFO L226 Difference]: Without dead ends: 4453 [2021-11-21 00:05:30,230 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 452 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:05:30,231 INFO L933 BasicCegarLoop]: 170 mSDtfsCounter, 187 mSDsluCounter, 555 mSDsCounter, 0 mSdLazyCounter, 568 mSolverCounterSat, 55 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 187 SdHoareTripleChecker+Valid, 725 SdHoareTripleChecker+Invalid, 625 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 568 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:05:30,231 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [187 Valid, 725 Invalid, 625 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 568 Invalid, 2 Unknown, 0 Unchecked, 9.0s Time] [2021-11-21 00:05:30,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4453 states. [2021-11-21 00:05:30,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4453 to 3706. [2021-11-21 00:05:30,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3706 states, 3705 states have (on average 1.5387314439946018) internal successors, (5701), 3705 states have internal predecessors, (5701), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:05:30,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3706 states to 3706 states and 5701 transitions. [2021-11-21 00:05:30,398 INFO L78 Accepts]: Start accepts. Automaton has 3706 states and 5701 transitions. Word has length 229 [2021-11-21 00:05:30,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:05:30,398 INFO L470 AbstractCegarLoop]: Abstraction has 3706 states and 5701 transitions. [2021-11-21 00:05:30,399 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 23.0) internal successors, (138), 6 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:05:30,399 INFO L276 IsEmpty]: Start isEmpty. Operand 3706 states and 5701 transitions. [2021-11-21 00:05:30,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2021-11-21 00:05:30,403 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:05:30,403 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 6, 5, 5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:05:30,415 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-21 00:05:30,603 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:05:30,604 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:05:30,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:05:30,604 INFO L85 PathProgramCache]: Analyzing trace with hash -1947282705, now seen corresponding path program 1 times [2021-11-21 00:05:30,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:05:30,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [879451886] [2021-11-21 00:05:30,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:05:30,605 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:05:30,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:05:30,606 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:05:30,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-21 00:05:31,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:05:31,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:05:31,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:05:31,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:05:31,528 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:05:31,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:05:31,874 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:05:31,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:05:31,920 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 144 proven. 0 refuted. 0 times theorem prover too weak. 363 trivial. 0 not checked. [2021-11-21 00:05:31,920 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:05:32,397 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 144 proven. 0 refuted. 0 times theorem prover too weak. 363 trivial. 0 not checked. [2021-11-21 00:05:32,398 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:05:32,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [879451886] [2021-11-21 00:05:32,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [879451886] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:05:32,398 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:05:32,398 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-21 00:05:32,398 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515042185] [2021-11-21 00:05:32,398 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:05:32,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:05:32,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:05:32,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:05:32,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:05:32,399 INFO L87 Difference]: Start difference. First operand 3706 states and 5701 transitions. Second operand has 7 states, 7 states have (on average 20.428571428571427) internal successors, (143), 7 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:05:34,411 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:05:44,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:05:44,204 INFO L93 Difference]: Finished difference Result 9129 states and 13837 transitions. [2021-11-21 00:05:44,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:05:44,206 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 20.428571428571427) internal successors, (143), 7 states have internal predecessors, (143), 0 states have call successors, (0), 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 230 [2021-11-21 00:05:44,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:05:44,211 INFO L225 Difference]: With dead ends: 9129 [2021-11-21 00:05:44,211 INFO L226 Difference]: Without dead ends: 5433 [2021-11-21 00:05:44,213 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 461 GetRequests, 452 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:05:44,213 INFO L933 BasicCegarLoop]: 221 mSDtfsCounter, 285 mSDsluCounter, 758 mSDsCounter, 0 mSdLazyCounter, 958 mSolverCounterSat, 62 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 285 SdHoareTripleChecker+Valid, 979 SdHoareTripleChecker+Invalid, 1021 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 958 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:05:44,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [285 Valid, 979 Invalid, 1021 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 958 Invalid, 1 Unknown, 0 Unchecked, 11.4s Time] [2021-11-21 00:05:44,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5433 states. [2021-11-21 00:05:44,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5433 to 3706. [2021-11-21 00:05:44,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3706 states, 3705 states have (on average 1.5244264507422403) internal successors, (5648), 3705 states have internal predecessors, (5648), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:05:44,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3706 states to 3706 states and 5648 transitions. [2021-11-21 00:05:44,359 INFO L78 Accepts]: Start accepts. Automaton has 3706 states and 5648 transitions. Word has length 230 [2021-11-21 00:05:44,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:05:44,359 INFO L470 AbstractCegarLoop]: Abstraction has 3706 states and 5648 transitions. [2021-11-21 00:05:44,359 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 20.428571428571427) internal successors, (143), 7 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:05:44,359 INFO L276 IsEmpty]: Start isEmpty. Operand 3706 states and 5648 transitions. [2021-11-21 00:05:44,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2021-11-21 00:05:44,363 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:05:44,364 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 6, 5, 5, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:05:44,376 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-21 00:05:44,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:05:44,564 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:05:44,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:05:44,565 INFO L85 PathProgramCache]: Analyzing trace with hash -2142551037, now seen corresponding path program 1 times [2021-11-21 00:05:44,565 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:05:44,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1732300472] [2021-11-21 00:05:44,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:05:44,566 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:05:44,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:05:44,566 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:05:44,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-21 00:05:45,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:05:45,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:05:45,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:05:45,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:05:45,420 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:05:45,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:05:45,804 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:05:45,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:05:45,841 INFO L134 CoverageAnalysis]: Checked inductivity of 509 backedges. 146 proven. 0 refuted. 0 times theorem prover too weak. 363 trivial. 0 not checked. [2021-11-21 00:05:45,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:05:46,246 INFO L134 CoverageAnalysis]: Checked inductivity of 509 backedges. 146 proven. 0 refuted. 0 times theorem prover too weak. 363 trivial. 0 not checked. [2021-11-21 00:05:46,247 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:05:46,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1732300472] [2021-11-21 00:05:46,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1732300472] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:05:46,247 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:05:46,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-21 00:05:46,248 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673049896] [2021-11-21 00:05:46,248 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:05:46,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:05:46,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:05:46,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:05:46,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:05:46,249 INFO L87 Difference]: Start difference. First operand 3706 states and 5648 transitions. Second operand has 7 states, 7 states have (on average 20.714285714285715) internal successors, (145), 7 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:05:48,264 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:05:50,278 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:05:52,290 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:05:59,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:05:59,745 INFO L93 Difference]: Finished difference Result 9001 states and 13507 transitions. [2021-11-21 00:05:59,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:05:59,751 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 20.714285714285715) internal successors, (145), 7 states have internal predecessors, (145), 0 states have call successors, (0), 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 231 [2021-11-21 00:05:59,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:05:59,757 INFO L225 Difference]: With dead ends: 9001 [2021-11-21 00:05:59,757 INFO L226 Difference]: Without dead ends: 5305 [2021-11-21 00:05:59,761 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 463 GetRequests, 454 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:05:59,762 INFO L933 BasicCegarLoop]: 211 mSDtfsCounter, 254 mSDsluCounter, 578 mSDsCounter, 0 mSdLazyCounter, 729 mSolverCounterSat, 61 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 789 SdHoareTripleChecker+Invalid, 793 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 729 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:05:59,763 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [254 Valid, 789 Invalid, 793 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 729 Invalid, 3 Unknown, 0 Unchecked, 13.0s Time] [2021-11-21 00:05:59,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5305 states. [2021-11-21 00:05:59,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5305 to 3706. [2021-11-21 00:05:59,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3706 states, 3705 states have (on average 1.5101214574898785) internal successors, (5595), 3705 states have internal predecessors, (5595), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:05:59,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3706 states to 3706 states and 5595 transitions. [2021-11-21 00:05:59,959 INFO L78 Accepts]: Start accepts. Automaton has 3706 states and 5595 transitions. Word has length 231 [2021-11-21 00:05:59,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:05:59,960 INFO L470 AbstractCegarLoop]: Abstraction has 3706 states and 5595 transitions. [2021-11-21 00:05:59,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 20.714285714285715) internal successors, (145), 7 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:05:59,960 INFO L276 IsEmpty]: Start isEmpty. Operand 3706 states and 5595 transitions. [2021-11-21 00:05:59,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2021-11-21 00:05:59,964 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:05:59,964 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 7, 7, 6, 6, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:05:59,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-21 00:06:00,165 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:06:00,165 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:06:00,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:06:00,165 INFO L85 PathProgramCache]: Analyzing trace with hash 1887592392, now seen corresponding path program 1 times [2021-11-21 00:06:00,167 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:06:00,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [500674432] [2021-11-21 00:06:00,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:06:00,167 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:06:00,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:06:00,168 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:06:00,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-21 00:06:00,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:06:00,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 603 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:06:00,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:06:01,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:06:01,241 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:06:01,241 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:06:01,493 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:06:01,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:06:01,614 INFO L134 CoverageAnalysis]: Checked inductivity of 664 backedges. 301 proven. 0 refuted. 0 times theorem prover too weak. 363 trivial. 0 not checked. [2021-11-21 00:06:01,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:06:02,067 INFO L134 CoverageAnalysis]: Checked inductivity of 664 backedges. 301 proven. 0 refuted. 0 times theorem prover too weak. 363 trivial. 0 not checked. [2021-11-21 00:06:02,067 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:06:02,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [500674432] [2021-11-21 00:06:02,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [500674432] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:06:02,067 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:06:02,068 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-21 00:06:02,068 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600636640] [2021-11-21 00:06:02,068 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:06:02,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:06:02,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:06:02,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:06:02,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:06:02,069 INFO L87 Difference]: Start difference. First operand 3706 states and 5595 transitions. Second operand has 7 states, 7 states have (on average 24.142857142857142) internal successors, (169), 7 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:06:04,079 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:06:10,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:06:10,823 INFO L93 Difference]: Finished difference Result 9379 states and 13952 transitions. [2021-11-21 00:06:10,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:06:10,825 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 24.142857142857142) internal successors, (169), 7 states have internal predecessors, (169), 0 states have call successors, (0), 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 258 [2021-11-21 00:06:10,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:06:10,830 INFO L225 Difference]: With dead ends: 9379 [2021-11-21 00:06:10,830 INFO L226 Difference]: Without dead ends: 5683 [2021-11-21 00:06:10,832 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 508 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:06:10,833 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 266 mSDsluCounter, 648 mSDsCounter, 0 mSdLazyCounter, 780 mSolverCounterSat, 62 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 858 SdHoareTripleChecker+Invalid, 843 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 780 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:06:10,833 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [266 Valid, 858 Invalid, 843 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 780 Invalid, 1 Unknown, 0 Unchecked, 8.3s Time] [2021-11-21 00:06:10,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5683 states. [2021-11-21 00:06:11,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5683 to 3940. [2021-11-21 00:06:11,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3940 states, 3939 states have (on average 1.4937801472454937) internal successors, (5884), 3939 states have internal predecessors, (5884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:06:11,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3940 states to 3940 states and 5884 transitions. [2021-11-21 00:06:11,039 INFO L78 Accepts]: Start accepts. Automaton has 3940 states and 5884 transitions. Word has length 258 [2021-11-21 00:06:11,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:06:11,040 INFO L470 AbstractCegarLoop]: Abstraction has 3940 states and 5884 transitions. [2021-11-21 00:06:11,040 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 24.142857142857142) internal successors, (169), 7 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:06:11,040 INFO L276 IsEmpty]: Start isEmpty. Operand 3940 states and 5884 transitions. [2021-11-21 00:06:11,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 260 [2021-11-21 00:06:11,044 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:06:11,045 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 7, 7, 6, 6, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:06:11,061 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-21 00:06:11,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:06:11,249 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:06:11,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:06:11,249 INFO L85 PathProgramCache]: Analyzing trace with hash -1206584772, now seen corresponding path program 1 times [2021-11-21 00:06:11,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:06:11,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [643103322] [2021-11-21 00:06:11,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:06:11,250 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:06:11,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:06:11,251 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:06:11,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-21 00:06:11,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:06:11,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 605 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:06:11,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:06:12,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:06:12,087 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:06:12,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:06:12,453 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:06:12,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:06:12,685 INFO L134 CoverageAnalysis]: Checked inductivity of 668 backedges. 305 proven. 0 refuted. 0 times theorem prover too weak. 363 trivial. 0 not checked. [2021-11-21 00:06:12,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:06:13,163 INFO L134 CoverageAnalysis]: Checked inductivity of 668 backedges. 305 proven. 0 refuted. 0 times theorem prover too weak. 363 trivial. 0 not checked. [2021-11-21 00:06:13,163 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:06:13,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [643103322] [2021-11-21 00:06:13,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [643103322] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:06:13,163 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:06:13,163 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-21 00:06:13,163 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881240380] [2021-11-21 00:06:13,163 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:06:13,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:06:13,164 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:06:13,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:06:13,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:06:13,165 INFO L87 Difference]: Start difference. First operand 3940 states and 5884 transitions. Second operand has 7 states, 7 states have (on average 24.428571428571427) internal successors, (171), 7 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:06:15,177 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:06:17,188 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:06:23,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:06:23,620 INFO L93 Difference]: Finished difference Result 9437 states and 13899 transitions. [2021-11-21 00:06:23,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:06:23,622 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 24.428571428571427) internal successors, (171), 7 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 259 [2021-11-21 00:06:23,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:06:23,626 INFO L225 Difference]: With dead ends: 9437 [2021-11-21 00:06:23,626 INFO L226 Difference]: Without dead ends: 5507 [2021-11-21 00:06:23,629 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 519 GetRequests, 510 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:06:23,630 INFO L933 BasicCegarLoop]: 208 mSDtfsCounter, 251 mSDsluCounter, 672 mSDsCounter, 0 mSdLazyCounter, 772 mSolverCounterSat, 61 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 251 SdHoareTripleChecker+Valid, 880 SdHoareTripleChecker+Invalid, 835 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 772 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:06:23,630 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [251 Valid, 880 Invalid, 835 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 772 Invalid, 2 Unknown, 0 Unchecked, 9.9s Time] [2021-11-21 00:06:23,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5507 states. [2021-11-21 00:06:23,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5507 to 3940. [2021-11-21 00:06:23,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3940 states, 3939 states have (on average 1.478040111703478) internal successors, (5822), 3939 states have internal predecessors, (5822), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:06:23,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3940 states to 3940 states and 5822 transitions. [2021-11-21 00:06:23,794 INFO L78 Accepts]: Start accepts. Automaton has 3940 states and 5822 transitions. Word has length 259 [2021-11-21 00:06:23,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:06:23,795 INFO L470 AbstractCegarLoop]: Abstraction has 3940 states and 5822 transitions. [2021-11-21 00:06:23,795 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 24.428571428571427) internal successors, (171), 7 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:06:23,795 INFO L276 IsEmpty]: Start isEmpty. Operand 3940 states and 5822 transitions. [2021-11-21 00:06:23,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2021-11-21 00:06:23,800 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:06:23,800 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:06:23,815 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (27)] Ended with exit code 0 [2021-11-21 00:06:24,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:06:24,001 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:06:24,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:06:24,001 INFO L85 PathProgramCache]: Analyzing trace with hash 392904728, now seen corresponding path program 1 times [2021-11-21 00:06:24,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:06:24,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [945024333] [2021-11-21 00:06:24,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:06:24,002 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:06:24,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:06:24,003 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:06:24,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-21 00:06:24,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:06:24,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 601 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:06:24,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:06:24,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:06:24,728 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:06:24,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:06:25,034 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:06:25,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:06:25,209 INFO L134 CoverageAnalysis]: Checked inductivity of 620 backedges. 394 proven. 0 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked. [2021-11-21 00:06:25,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:06:25,733 INFO L134 CoverageAnalysis]: Checked inductivity of 620 backedges. 394 proven. 0 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked. [2021-11-21 00:06:25,734 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:06:25,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [945024333] [2021-11-21 00:06:25,734 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [945024333] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:06:25,734 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:06:25,734 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-21 00:06:25,734 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541915147] [2021-11-21 00:06:25,734 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:06:25,735 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:06:25,735 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:06:25,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:06:25,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:06:25,735 INFO L87 Difference]: Start difference. First operand 3940 states and 5822 transitions. Second operand has 7 states, 7 states have (on average 24.142857142857142) internal successors, (169), 7 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:06:27,749 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:06:34,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:06:34,360 INFO L93 Difference]: Finished difference Result 9815 states and 14308 transitions. [2021-11-21 00:06:34,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:06:34,362 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 24.142857142857142) internal successors, (169), 7 states have internal predecessors, (169), 0 states have call successors, (0), 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 262 [2021-11-21 00:06:34,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:06:34,367 INFO L225 Difference]: With dead ends: 9815 [2021-11-21 00:06:34,367 INFO L226 Difference]: Without dead ends: 5885 [2021-11-21 00:06:34,369 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 525 GetRequests, 516 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:06:34,369 INFO L933 BasicCegarLoop]: 206 mSDtfsCounter, 242 mSDsluCounter, 667 mSDsCounter, 0 mSdLazyCounter, 775 mSolverCounterSat, 55 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 242 SdHoareTripleChecker+Valid, 873 SdHoareTripleChecker+Invalid, 831 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 775 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:06:34,370 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [242 Valid, 873 Invalid, 831 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 775 Invalid, 1 Unknown, 0 Unchecked, 8.2s Time] [2021-11-21 00:06:34,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5885 states. [2021-11-21 00:06:34,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5885 to 4210. [2021-11-21 00:06:34,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4210 states, 4209 states have (on average 1.4625801853171774) internal successors, (6156), 4209 states have internal predecessors, (6156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:06:34,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4210 states to 4210 states and 6156 transitions. [2021-11-21 00:06:34,630 INFO L78 Accepts]: Start accepts. Automaton has 4210 states and 6156 transitions. Word has length 262 [2021-11-21 00:06:34,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:06:34,631 INFO L470 AbstractCegarLoop]: Abstraction has 4210 states and 6156 transitions. [2021-11-21 00:06:34,631 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 24.142857142857142) internal successors, (169), 7 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:06:34,631 INFO L276 IsEmpty]: Start isEmpty. Operand 4210 states and 6156 transitions. [2021-11-21 00:06:34,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2021-11-21 00:06:34,639 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:06:34,640 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:06:34,657 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-21 00:06:34,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:06:34,857 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:06:34,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:06:34,858 INFO L85 PathProgramCache]: Analyzing trace with hash 1863069562, now seen corresponding path program 1 times [2021-11-21 00:06:34,858 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:06:34,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1734771860] [2021-11-21 00:06:34,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:06:34,859 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:06:34,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:06:34,862 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:06:34,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-21 00:06:35,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:06:35,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 603 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:06:35,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:06:35,594 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:06:35,649 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:06:35,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:06:35,956 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:06:35,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:06:36,136 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 399 proven. 0 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked. [2021-11-21 00:06:36,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:06:36,731 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 399 proven. 0 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked. [2021-11-21 00:06:36,732 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:06:36,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1734771860] [2021-11-21 00:06:36,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1734771860] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:06:36,732 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:06:36,732 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-21 00:06:36,732 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883865763] [2021-11-21 00:06:36,732 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:06:36,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:06:36,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:06:36,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:06:36,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:06:36,733 INFO L87 Difference]: Start difference. First operand 4210 states and 6156 transitions. Second operand has 7 states, 7 states have (on average 24.428571428571427) internal successors, (171), 7 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:06:38,745 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:06:44,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:06:44,478 INFO L93 Difference]: Finished difference Result 9945 states and 14379 transitions. [2021-11-21 00:06:44,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:06:44,478 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 24.428571428571427) internal successors, (171), 7 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 263 [2021-11-21 00:06:44,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:06:44,483 INFO L225 Difference]: With dead ends: 9945 [2021-11-21 00:06:44,483 INFO L226 Difference]: Without dead ends: 5745 [2021-11-21 00:06:44,484 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 527 GetRequests, 518 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:06:44,485 INFO L933 BasicCegarLoop]: 192 mSDtfsCounter, 245 mSDsluCounter, 607 mSDsCounter, 0 mSdLazyCounter, 747 mSolverCounterSat, 65 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 245 SdHoareTripleChecker+Valid, 799 SdHoareTripleChecker+Invalid, 813 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 747 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:06:44,485 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [245 Valid, 799 Invalid, 813 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 747 Invalid, 1 Unknown, 0 Unchecked, 7.3s Time] [2021-11-21 00:06:44,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5745 states. [2021-11-21 00:06:44,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5745 to 4210. [2021-11-21 00:06:44,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4210 states, 4209 states have (on average 1.4499881206937515) internal successors, (6103), 4209 states have internal predecessors, (6103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:06:44,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4210 states to 4210 states and 6103 transitions. [2021-11-21 00:06:44,699 INFO L78 Accepts]: Start accepts. Automaton has 4210 states and 6103 transitions. Word has length 263 [2021-11-21 00:06:44,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:06:44,700 INFO L470 AbstractCegarLoop]: Abstraction has 4210 states and 6103 transitions. [2021-11-21 00:06:44,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 24.428571428571427) internal successors, (171), 7 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:06:44,700 INFO L276 IsEmpty]: Start isEmpty. Operand 4210 states and 6103 transitions. [2021-11-21 00:06:44,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2021-11-21 00:06:44,705 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:06:44,706 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:06:44,724 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-21 00:06:44,922 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:06:44,923 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:06:44,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:06:44,923 INFO L85 PathProgramCache]: Analyzing trace with hash 137842279, now seen corresponding path program 1 times [2021-11-21 00:06:44,924 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:06:44,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1382342144] [2021-11-21 00:06:44,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:06:44,924 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:06:44,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:06:44,925 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:06:44,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-21 00:06:45,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:06:45,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 622 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:06:45,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:06:45,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:06:45,700 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:06:45,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:06:46,080 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:06:46,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:06:46,274 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 434 proven. 0 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-11-21 00:06:46,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:06:46,852 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 434 proven. 0 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-11-21 00:06:46,852 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:06:46,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1382342144] [2021-11-21 00:06:46,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1382342144] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:06:46,853 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:06:46,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-21 00:06:46,853 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471266872] [2021-11-21 00:06:46,853 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:06:46,853 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:06:46,853 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:06:46,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:06:46,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:06:46,854 INFO L87 Difference]: Start difference. First operand 4210 states and 6103 transitions. Second operand has 7 states, 7 states have (on average 25.571428571428573) internal successors, (179), 7 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) [2021-11-21 00:06:48,867 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:06:50,878 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:06:57,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:06:57,779 INFO L93 Difference]: Finished difference Result 10323 states and 14788 transitions. [2021-11-21 00:06:57,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:06:57,780 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 25.571428571428573) internal successors, (179), 7 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) Word has length 272 [2021-11-21 00:06:57,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:06:57,784 INFO L225 Difference]: With dead ends: 10323 [2021-11-21 00:06:57,785 INFO L226 Difference]: Without dead ends: 6123 [2021-11-21 00:06:57,786 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 545 GetRequests, 536 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:06:57,787 INFO L933 BasicCegarLoop]: 190 mSDtfsCounter, 234 mSDsluCounter, 703 mSDsCounter, 0 mSdLazyCounter, 858 mSolverCounterSat, 63 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 893 SdHoareTripleChecker+Invalid, 923 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 858 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:06:57,787 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [234 Valid, 893 Invalid, 923 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 858 Invalid, 2 Unknown, 0 Unchecked, 10.4s Time] [2021-11-21 00:06:57,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6123 states. [2021-11-21 00:06:57,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6123 to 4525. [2021-11-21 00:06:57,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4525 states, 4524 states have (on average 1.440760389036251) internal successors, (6518), 4524 states have internal predecessors, (6518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:06:57,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4525 states to 4525 states and 6518 transitions. [2021-11-21 00:06:57,988 INFO L78 Accepts]: Start accepts. Automaton has 4525 states and 6518 transitions. Word has length 272 [2021-11-21 00:06:57,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:06:57,989 INFO L470 AbstractCegarLoop]: Abstraction has 4525 states and 6518 transitions. [2021-11-21 00:06:57,989 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 25.571428571428573) internal successors, (179), 7 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) [2021-11-21 00:06:57,989 INFO L276 IsEmpty]: Start isEmpty. Operand 4525 states and 6518 transitions. [2021-11-21 00:06:57,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2021-11-21 00:06:57,994 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:06:57,995 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:06:58,018 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-21 00:06:58,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:06:58,211 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:06:58,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:06:58,212 INFO L85 PathProgramCache]: Analyzing trace with hash -872669234, now seen corresponding path program 1 times [2021-11-21 00:06:58,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:06:58,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1768037942] [2021-11-21 00:06:58,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:06:58,212 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:06:58,213 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:06:58,213 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:06:58,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-21 00:06:58,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:06:58,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 624 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:06:58,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:06:58,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:06:58,944 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:06:58,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:06:59,318 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:06:59,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:06:59,509 INFO L134 CoverageAnalysis]: Checked inductivity of 670 backedges. 439 proven. 0 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-11-21 00:06:59,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:07:00,083 INFO L134 CoverageAnalysis]: Checked inductivity of 670 backedges. 439 proven. 0 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-11-21 00:07:00,083 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:07:00,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1768037942] [2021-11-21 00:07:00,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1768037942] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:07:00,084 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:07:00,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-21 00:07:00,084 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419632676] [2021-11-21 00:07:00,084 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:07:00,085 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:07:00,085 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:07:00,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:07:00,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:07:00,085 INFO L87 Difference]: Start difference. First operand 4525 states and 6518 transitions. Second operand has 7 states, 7 states have (on average 25.857142857142858) internal successors, (181), 7 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:07:02,098 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:07:07,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:07:07,730 INFO L93 Difference]: Finished difference Result 10543 states and 15039 transitions. [2021-11-21 00:07:07,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:07:07,732 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 25.857142857142858) internal successors, (181), 7 states have internal predecessors, (181), 0 states have call successors, (0), 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 273 [2021-11-21 00:07:07,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:07:07,739 INFO L225 Difference]: With dead ends: 10543 [2021-11-21 00:07:07,740 INFO L226 Difference]: Without dead ends: 6028 [2021-11-21 00:07:07,742 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 547 GetRequests, 538 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:07:07,744 INFO L933 BasicCegarLoop]: 186 mSDtfsCounter, 219 mSDsluCounter, 615 mSDsCounter, 0 mSdLazyCounter, 753 mSolverCounterSat, 62 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 801 SdHoareTripleChecker+Invalid, 816 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 753 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:07:07,745 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [219 Valid, 801 Invalid, 816 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 753 Invalid, 1 Unknown, 0 Unchecked, 7.2s Time] [2021-11-21 00:07:07,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6028 states. [2021-11-21 00:07:08,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6028 to 4525. [2021-11-21 00:07:08,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4525 states, 4524 states have (on average 1.4330238726790452) internal successors, (6483), 4524 states have internal predecessors, (6483), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:07:08,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4525 states to 4525 states and 6483 transitions. [2021-11-21 00:07:08,066 INFO L78 Accepts]: Start accepts. Automaton has 4525 states and 6483 transitions. Word has length 273 [2021-11-21 00:07:08,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:07:08,067 INFO L470 AbstractCegarLoop]: Abstraction has 4525 states and 6483 transitions. [2021-11-21 00:07:08,067 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 25.857142857142858) internal successors, (181), 7 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:07:08,067 INFO L276 IsEmpty]: Start isEmpty. Operand 4525 states and 6483 transitions. [2021-11-21 00:07:08,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2021-11-21 00:07:08,071 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:07:08,072 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 8, 8, 7, 6, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:07:08,097 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-21 00:07:08,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:07:08,298 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:07:08,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:07:08,298 INFO L85 PathProgramCache]: Analyzing trace with hash 211660928, now seen corresponding path program 1 times [2021-11-21 00:07:08,299 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:07:08,299 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [558218651] [2021-11-21 00:07:08,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:07:08,300 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:07:08,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:07:08,300 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:07:08,302 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-21 00:07:09,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:07:09,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 652 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:07:09,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:07:09,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:07:09,462 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:07:09,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:07:09,734 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:07:09,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:07:09,901 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 450 proven. 0 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2021-11-21 00:07:09,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:07:10,420 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 450 proven. 0 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2021-11-21 00:07:10,421 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:07:10,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [558218651] [2021-11-21 00:07:10,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [558218651] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:07:10,421 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:07:10,421 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-21 00:07:10,421 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474289787] [2021-11-21 00:07:10,421 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:07:10,422 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:07:10,422 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:07:10,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:07:10,422 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:07:10,422 INFO L87 Difference]: Start difference. First operand 4525 states and 6483 transitions. Second operand has 7 states, 7 states have (on average 24.428571428571427) internal successors, (171), 7 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:07:12,435 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:07:14,443 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:07:20,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:07:20,232 INFO L93 Difference]: Finished difference Result 10460 states and 14845 transitions. [2021-11-21 00:07:20,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:07:20,235 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 24.428571428571427) internal successors, (171), 7 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 281 [2021-11-21 00:07:20,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:07:20,239 INFO L225 Difference]: With dead ends: 10460 [2021-11-21 00:07:20,239 INFO L226 Difference]: Without dead ends: 5945 [2021-11-21 00:07:20,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 563 GetRequests, 554 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:07:20,241 INFO L933 BasicCegarLoop]: 174 mSDtfsCounter, 226 mSDsluCounter, 585 mSDsCounter, 0 mSdLazyCounter, 738 mSolverCounterSat, 62 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 759 SdHoareTripleChecker+Invalid, 802 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 738 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:07:20,242 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [226 Valid, 759 Invalid, 802 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 738 Invalid, 2 Unknown, 0 Unchecked, 9.3s Time] [2021-11-21 00:07:20,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5945 states. [2021-11-21 00:07:20,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5945 to 4525. [2021-11-21 00:07:20,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4525 states, 4524 states have (on average 1.4133510167992926) internal successors, (6394), 4524 states have internal predecessors, (6394), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:07:20,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4525 states to 4525 states and 6394 transitions. [2021-11-21 00:07:20,482 INFO L78 Accepts]: Start accepts. Automaton has 4525 states and 6394 transitions. Word has length 281 [2021-11-21 00:07:20,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:07:20,482 INFO L470 AbstractCegarLoop]: Abstraction has 4525 states and 6394 transitions. [2021-11-21 00:07:20,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 24.428571428571427) internal successors, (171), 7 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:07:20,482 INFO L276 IsEmpty]: Start isEmpty. Operand 4525 states and 6394 transitions. [2021-11-21 00:07:20,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2021-11-21 00:07:20,486 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:07:20,486 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:07:20,500 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (32)] Ended with exit code 0 [2021-11-21 00:07:20,686 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:07:20,687 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:07:20,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:07:20,687 INFO L85 PathProgramCache]: Analyzing trace with hash 1212456008, now seen corresponding path program 1 times [2021-11-21 00:07:20,688 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:07:20,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [233111376] [2021-11-21 00:07:20,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:07:20,688 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:07:20,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:07:20,689 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:07:20,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-21 00:07:21,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:07:21,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 659 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:07:21,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:07:21,410 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:07:21,463 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:07:21,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:07:21,921 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:07:21,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:07:22,142 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 482 proven. 0 refuted. 0 times theorem prover too weak. 233 trivial. 0 not checked. [2021-11-21 00:07:22,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:07:22,858 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 482 proven. 0 refuted. 0 times theorem prover too weak. 233 trivial. 0 not checked. [2021-11-21 00:07:22,858 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:07:22,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [233111376] [2021-11-21 00:07:22,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [233111376] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:07:22,859 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:07:22,859 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-21 00:07:22,859 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480594713] [2021-11-21 00:07:22,859 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:07:22,860 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:07:22,860 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:07:22,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:07:22,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:07:22,861 INFO L87 Difference]: Start difference. First operand 4525 states and 6394 transitions. Second operand has 7 states, 7 states have (on average 28.714285714285715) internal successors, (201), 7 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:07:24,872 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:07:31,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:07:31,479 INFO L93 Difference]: Finished difference Result 10838 states and 15155 transitions. [2021-11-21 00:07:31,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:07:31,481 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 28.714285714285715) internal successors, (201), 7 states have internal predecessors, (201), 0 states have call successors, (0), 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 290 [2021-11-21 00:07:31,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:07:31,486 INFO L225 Difference]: With dead ends: 10838 [2021-11-21 00:07:31,486 INFO L226 Difference]: Without dead ends: 6323 [2021-11-21 00:07:31,488 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 581 GetRequests, 572 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:07:31,488 INFO L933 BasicCegarLoop]: 173 mSDtfsCounter, 200 mSDsluCounter, 632 mSDsCounter, 0 mSdLazyCounter, 813 mSolverCounterSat, 61 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 200 SdHoareTripleChecker+Valid, 805 SdHoareTripleChecker+Invalid, 875 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 813 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:07:31,489 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [200 Valid, 805 Invalid, 875 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 813 Invalid, 1 Unknown, 0 Unchecked, 8.1s Time] [2021-11-21 00:07:31,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6323 states. [2021-11-21 00:07:31,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6323 to 4901. [2021-11-21 00:07:31,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4901 states, 4900 states have (on average 1.4038775510204082) internal successors, (6879), 4900 states have internal predecessors, (6879), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:07:31,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4901 states to 4901 states and 6879 transitions. [2021-11-21 00:07:31,723 INFO L78 Accepts]: Start accepts. Automaton has 4901 states and 6879 transitions. Word has length 290 [2021-11-21 00:07:31,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:07:31,724 INFO L470 AbstractCegarLoop]: Abstraction has 4901 states and 6879 transitions. [2021-11-21 00:07:31,724 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 28.714285714285715) internal successors, (201), 7 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:07:31,724 INFO L276 IsEmpty]: Start isEmpty. Operand 4901 states and 6879 transitions. [2021-11-21 00:07:31,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2021-11-21 00:07:31,727 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:07:31,728 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:07:31,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-21 00:07:31,928 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:07:31,928 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:07:31,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:07:31,929 INFO L85 PathProgramCache]: Analyzing trace with hash -2135473402, now seen corresponding path program 1 times [2021-11-21 00:07:31,929 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:07:31,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [625358216] [2021-11-21 00:07:31,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:07:31,930 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:07:31,930 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:07:31,930 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:07:31,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-21 00:07:32,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:07:32,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 659 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 00:07:32,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:07:33,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:07:33,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 39 [2021-11-21 00:07:33,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 33 [2021-11-21 00:07:33,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:07:33,469 INFO L354 Elim1Store]: treesize reduction 48, result has 44.8 percent of original size [2021-11-21 00:07:33,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 33 treesize of output 55 [2021-11-21 00:07:33,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:07:33,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:07:33,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:07:33,850 INFO L354 Elim1Store]: treesize reduction 57, result has 25.0 percent of original size [2021-11-21 00:07:33,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 52 treesize of output 67 [2021-11-21 00:07:35,091 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 00:07:35,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 30 treesize of output 14 [2021-11-21 00:07:35,450 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 508 proven. 0 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2021-11-21 00:07:35,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:07:36,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 76 treesize of output 52 [2021-11-21 00:07:36,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 40 [2021-11-21 00:07:38,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 98 treesize of output 92 [2021-11-21 00:07:38,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 35 [2021-11-21 00:07:38,604 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 508 proven. 0 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2021-11-21 00:07:38,604 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:07:38,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [625358216] [2021-11-21 00:07:38,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [625358216] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:07:38,605 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:07:38,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10, 7] imperfect sequences [] total 14 [2021-11-21 00:07:38,605 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929698412] [2021-11-21 00:07:38,605 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:07:38,606 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 00:07:38,606 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:07:38,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 00:07:38,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=128, Unknown=0, NotChecked=0, Total=182 [2021-11-21 00:07:38,606 INFO L87 Difference]: Start difference. First operand 4901 states and 6879 transitions. Second operand has 14 states, 14 states have (on average 18.928571428571427) internal successors, (265), 14 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:07:40,623 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:07:42,633 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:07:44,641 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:07:59,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:07:59,740 INFO L93 Difference]: Finished difference Result 14526 states and 20374 transitions. [2021-11-21 00:07:59,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 00:07:59,741 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 18.928571428571427) internal successors, (265), 14 states have internal predecessors, (265), 0 states have call successors, (0), 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 290 [2021-11-21 00:07:59,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:07:59,748 INFO L225 Difference]: With dead ends: 14526 [2021-11-21 00:07:59,749 INFO L226 Difference]: Without dead ends: 9635 [2021-11-21 00:07:59,752 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 600 GetRequests, 574 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=217, Invalid=485, Unknown=0, NotChecked=0, Total=702 [2021-11-21 00:07:59,752 INFO L933 BasicCegarLoop]: 222 mSDtfsCounter, 695 mSDsluCounter, 1333 mSDsCounter, 0 mSdLazyCounter, 1331 mSolverCounterSat, 66 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 695 SdHoareTripleChecker+Valid, 1555 SdHoareTripleChecker+Invalid, 1664 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 1331 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 264 IncrementalHoareTripleChecker+Unchecked, 19.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:07:59,752 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [695 Valid, 1555 Invalid, 1664 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 1331 Invalid, 3 Unknown, 264 Unchecked, 19.9s Time] [2021-11-21 00:07:59,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9635 states. [2021-11-21 00:08:00,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9635 to 8696. [2021-11-21 00:08:00,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8696 states, 8695 states have (on average 1.4163312248418631) internal successors, (12315), 8695 states have internal predecessors, (12315), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:08:00,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8696 states to 8696 states and 12315 transitions. [2021-11-21 00:08:00,229 INFO L78 Accepts]: Start accepts. Automaton has 8696 states and 12315 transitions. Word has length 290 [2021-11-21 00:08:00,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:08:00,229 INFO L470 AbstractCegarLoop]: Abstraction has 8696 states and 12315 transitions. [2021-11-21 00:08:00,229 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 18.928571428571427) internal successors, (265), 14 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:08:00,229 INFO L276 IsEmpty]: Start isEmpty. Operand 8696 states and 12315 transitions. [2021-11-21 00:08:00,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2021-11-21 00:08:00,235 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:08:00,236 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:08:00,252 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-11-21 00:08:00,436 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:08:00,436 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:08:00,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:08:00,437 INFO L85 PathProgramCache]: Analyzing trace with hash -1874861105, now seen corresponding path program 1 times [2021-11-21 00:08:00,437 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:08:00,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [529624207] [2021-11-21 00:08:00,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:08:00,438 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:08:00,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:08:00,438 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:08:00,439 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-21 00:08:00,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:08:00,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 661 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:08:00,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:08:01,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:08:01,155 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:08:01,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:08:01,639 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:08:01,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:08:01,883 INFO L134 CoverageAnalysis]: Checked inductivity of 717 backedges. 484 proven. 0 refuted. 0 times theorem prover too weak. 233 trivial. 0 not checked. [2021-11-21 00:08:01,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:08:02,655 INFO L134 CoverageAnalysis]: Checked inductivity of 717 backedges. 484 proven. 0 refuted. 0 times theorem prover too weak. 233 trivial. 0 not checked. [2021-11-21 00:08:02,656 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:08:02,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [529624207] [2021-11-21 00:08:02,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [529624207] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:08:02,656 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:08:02,657 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-21 00:08:02,657 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677723496] [2021-11-21 00:08:02,657 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:08:02,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:08:02,658 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:08:02,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:08:02,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:08:02,658 INFO L87 Difference]: Start difference. First operand 8696 states and 12315 transitions. Second operand has 7 states, 7 states have (on average 29.0) internal successors, (203), 7 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:08:04,678 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:08:10,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:08:10,604 INFO L93 Difference]: Finished difference Result 19977 states and 28081 transitions. [2021-11-21 00:08:10,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:08:10,604 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 29.0) internal successors, (203), 7 states have internal predecessors, (203), 0 states have call successors, (0), 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 291 [2021-11-21 00:08:10,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:08:10,613 INFO L225 Difference]: With dead ends: 19977 [2021-11-21 00:08:10,613 INFO L226 Difference]: Without dead ends: 11091 [2021-11-21 00:08:10,617 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 583 GetRequests, 574 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:08:10,618 INFO L933 BasicCegarLoop]: 170 mSDtfsCounter, 189 mSDsluCounter, 575 mSDsCounter, 0 mSdLazyCounter, 728 mSolverCounterSat, 60 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 745 SdHoareTripleChecker+Invalid, 789 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 728 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:08:10,618 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [189 Valid, 745 Invalid, 789 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 728 Invalid, 1 Unknown, 0 Unchecked, 7.0s Time] [2021-11-21 00:08:10,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11091 states. [2021-11-21 00:08:11,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11091 to 8624. [2021-11-21 00:08:11,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8624 states, 8623 states have (on average 1.409486257682941) internal successors, (12154), 8623 states have internal predecessors, (12154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:08:11,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8624 states to 8624 states and 12154 transitions. [2021-11-21 00:08:11,198 INFO L78 Accepts]: Start accepts. Automaton has 8624 states and 12154 transitions. Word has length 291 [2021-11-21 00:08:11,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:08:11,198 INFO L470 AbstractCegarLoop]: Abstraction has 8624 states and 12154 transitions. [2021-11-21 00:08:11,198 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 29.0) internal successors, (203), 7 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:08:11,198 INFO L276 IsEmpty]: Start isEmpty. Operand 8624 states and 12154 transitions. [2021-11-21 00:08:11,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 303 [2021-11-21 00:08:11,205 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:08:11,205 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 8, 8, 6, 6, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:08:11,227 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (35)] Ended with exit code 0 [2021-11-21 00:08:11,423 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:08:11,423 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:08:11,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:08:11,424 INFO L85 PathProgramCache]: Analyzing trace with hash -1868474394, now seen corresponding path program 1 times [2021-11-21 00:08:11,425 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:08:11,425 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [872901866] [2021-11-21 00:08:11,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:08:11,425 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:08:11,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:08:11,426 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:08:11,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-21 00:08:12,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:08:12,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 692 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:08:12,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:08:12,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:08:12,389 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:08:12,389 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:08:12,675 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:08:12,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:08:12,943 INFO L134 CoverageAnalysis]: Checked inductivity of 997 backedges. 575 proven. 0 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2021-11-21 00:08:12,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:08:13,529 INFO L134 CoverageAnalysis]: Checked inductivity of 997 backedges. 575 proven. 0 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2021-11-21 00:08:13,529 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:08:13,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [872901866] [2021-11-21 00:08:13,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [872901866] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:08:13,530 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:08:13,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-21 00:08:13,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329193554] [2021-11-21 00:08:13,530 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:08:13,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:08:13,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:08:13,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:08:13,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:08:13,532 INFO L87 Difference]: Start difference. First operand 8624 states and 12154 transitions. Second operand has 7 states, 7 states have (on average 24.428571428571427) internal successors, (171), 7 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:08:15,546 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:08:17,559 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:08:23,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:08:23,363 INFO L93 Difference]: Finished difference Result 20249 states and 28335 transitions. [2021-11-21 00:08:23,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:08:23,364 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 24.428571428571427) internal successors, (171), 7 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 302 [2021-11-21 00:08:23,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:08:23,373 INFO L225 Difference]: With dead ends: 20249 [2021-11-21 00:08:23,373 INFO L226 Difference]: Without dead ends: 11635 [2021-11-21 00:08:23,377 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 596 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:08:23,377 INFO L933 BasicCegarLoop]: 168 mSDtfsCounter, 219 mSDsluCounter, 479 mSDsCounter, 0 mSdLazyCounter, 612 mSolverCounterSat, 63 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 647 SdHoareTripleChecker+Invalid, 677 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 612 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:08:23,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [219 Valid, 647 Invalid, 677 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 612 Invalid, 2 Unknown, 0 Unchecked, 8.9s Time] [2021-11-21 00:08:23,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11635 states. [2021-11-21 00:08:23,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11635 to 8976. [2021-11-21 00:08:23,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8976 states, 8975 states have (on average 1.3896378830083564) internal successors, (12472), 8975 states have internal predecessors, (12472), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:08:23,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8976 states to 8976 states and 12472 transitions. [2021-11-21 00:08:23,895 INFO L78 Accepts]: Start accepts. Automaton has 8976 states and 12472 transitions. Word has length 302 [2021-11-21 00:08:23,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:08:23,895 INFO L470 AbstractCegarLoop]: Abstraction has 8976 states and 12472 transitions. [2021-11-21 00:08:23,895 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 24.428571428571427) internal successors, (171), 7 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:08:23,895 INFO L276 IsEmpty]: Start isEmpty. Operand 8976 states and 12472 transitions. [2021-11-21 00:08:23,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 304 [2021-11-21 00:08:23,903 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:08:23,904 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 9, 8, 6, 6, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:08:23,939 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-21 00:08:24,118 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:08:24,118 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:08:24,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:08:24,119 INFO L85 PathProgramCache]: Analyzing trace with hash 1776323354, now seen corresponding path program 1 times [2021-11-21 00:08:24,119 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:08:24,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [958504192] [2021-11-21 00:08:24,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:08:24,120 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:08:24,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:08:24,120 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:08:24,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-21 00:08:24,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:08:24,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 694 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:08:24,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:08:24,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:08:24,992 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:08:24,992 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:08:25,252 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:08:25,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:08:25,477 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 583 proven. 0 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2021-11-21 00:08:25,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:08:26,068 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 583 proven. 0 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2021-11-21 00:08:26,068 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:08:26,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [958504192] [2021-11-21 00:08:26,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [958504192] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:08:26,069 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:08:26,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-21 00:08:26,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205523041] [2021-11-21 00:08:26,069 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:08:26,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:08:26,070 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:08:26,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:08:26,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:08:26,070 INFO L87 Difference]: Start difference. First operand 8976 states and 12472 transitions. Second operand has 7 states, 7 states have (on average 24.714285714285715) internal successors, (173), 7 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:08:28,081 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:08:34,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:08:34,267 INFO L93 Difference]: Finished difference Result 20281 states and 28029 transitions. [2021-11-21 00:08:34,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:08:34,268 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 24.714285714285715) internal successors, (173), 7 states have internal predecessors, (173), 0 states have call successors, (0), 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 303 [2021-11-21 00:08:34,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:08:34,276 INFO L225 Difference]: With dead ends: 20281 [2021-11-21 00:08:34,276 INFO L226 Difference]: Without dead ends: 11315 [2021-11-21 00:08:34,279 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 607 GetRequests, 598 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:08:34,281 INFO L933 BasicCegarLoop]: 160 mSDtfsCounter, 205 mSDsluCounter, 440 mSDsCounter, 0 mSdLazyCounter, 579 mSolverCounterSat, 65 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 600 SdHoareTripleChecker+Invalid, 645 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 579 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:08:34,281 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [205 Valid, 600 Invalid, 645 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 579 Invalid, 1 Unknown, 0 Unchecked, 7.3s Time] [2021-11-21 00:08:34,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11315 states. [2021-11-21 00:08:34,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11315 to 8976. [2021-11-21 00:08:34,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8976 states, 8975 states have (on average 1.3680222841225627) internal successors, (12278), 8975 states have internal predecessors, (12278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:08:34,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8976 states to 8976 states and 12278 transitions. [2021-11-21 00:08:34,760 INFO L78 Accepts]: Start accepts. Automaton has 8976 states and 12278 transitions. Word has length 303 [2021-11-21 00:08:34,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:08:34,760 INFO L470 AbstractCegarLoop]: Abstraction has 8976 states and 12278 transitions. [2021-11-21 00:08:34,760 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 24.714285714285715) internal successors, (173), 7 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:08:34,760 INFO L276 IsEmpty]: Start isEmpty. Operand 8976 states and 12278 transitions. [2021-11-21 00:08:34,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2021-11-21 00:08:34,766 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:08:34,766 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 5, 5, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:08:34,781 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-21 00:08:34,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:08:34,967 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:08:34,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:08:34,967 INFO L85 PathProgramCache]: Analyzing trace with hash -1370780019, now seen corresponding path program 1 times [2021-11-21 00:08:34,969 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:08:34,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1164112378] [2021-11-21 00:08:34,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:08:34,969 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:08:34,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:08:34,970 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:08:34,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-21 00:08:35,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:08:35,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 685 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:08:35,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:08:35,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:08:35,688 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:08:35,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:08:36,072 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:08:36,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:08:36,356 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 570 proven. 0 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2021-11-21 00:08:36,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:08:37,068 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 570 proven. 0 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2021-11-21 00:08:37,068 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:08:37,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1164112378] [2021-11-21 00:08:37,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1164112378] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:08:37,069 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:08:37,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-21 00:08:37,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660085495] [2021-11-21 00:08:37,069 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:08:37,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:08:37,070 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:08:37,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:08:37,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:08:37,070 INFO L87 Difference]: Start difference. First operand 8976 states and 12278 transitions. Second operand has 7 states, 7 states have (on average 25.714285714285715) internal successors, (180), 7 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:08:39,088 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:08:45,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:08:45,320 INFO L93 Difference]: Finished difference Result 20825 states and 28329 transitions. [2021-11-21 00:08:45,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:08:45,321 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 25.714285714285715) internal successors, (180), 7 states have internal predecessors, (180), 0 states have call successors, (0), 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 304 [2021-11-21 00:08:45,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:08:45,335 INFO L225 Difference]: With dead ends: 20825 [2021-11-21 00:08:45,335 INFO L226 Difference]: Without dead ends: 11859 [2021-11-21 00:08:45,338 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 609 GetRequests, 600 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:08:45,338 INFO L933 BasicCegarLoop]: 163 mSDtfsCounter, 182 mSDsluCounter, 601 mSDsCounter, 0 mSdLazyCounter, 726 mSolverCounterSat, 63 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 764 SdHoareTripleChecker+Invalid, 790 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 726 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:08:45,339 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [182 Valid, 764 Invalid, 790 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 726 Invalid, 1 Unknown, 0 Unchecked, 7.3s Time] [2021-11-21 00:08:45,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11859 states. [2021-11-21 00:08:45,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11859 to 9504. [2021-11-21 00:08:45,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9504 states, 9503 states have (on average 1.355887614437546) internal successors, (12885), 9503 states have internal predecessors, (12885), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:08:45,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9504 states to 9504 states and 12885 transitions. [2021-11-21 00:08:45,843 INFO L78 Accepts]: Start accepts. Automaton has 9504 states and 12885 transitions. Word has length 304 [2021-11-21 00:08:45,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:08:45,844 INFO L470 AbstractCegarLoop]: Abstraction has 9504 states and 12885 transitions. [2021-11-21 00:08:45,844 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 25.714285714285715) internal successors, (180), 7 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:08:45,844 INFO L276 IsEmpty]: Start isEmpty. Operand 9504 states and 12885 transitions. [2021-11-21 00:08:45,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2021-11-21 00:08:45,850 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:08:45,850 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 5, 5, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:08:45,862 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-11-21 00:08:46,051 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:08:46,051 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:08:46,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:08:46,051 INFO L85 PathProgramCache]: Analyzing trace with hash 159959892, now seen corresponding path program 1 times [2021-11-21 00:08:46,052 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:08:46,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1827461399] [2021-11-21 00:08:46,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:08:46,052 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:08:46,052 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:08:46,053 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:08:46,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-21 00:08:46,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:08:46,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 687 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:08:46,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:08:46,780 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:08:46,822 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:08:46,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-21 00:08:47,178 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:08:47,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-21 00:08:47,458 INFO L134 CoverageAnalysis]: Checked inductivity of 867 backedges. 576 proven. 0 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2021-11-21 00:08:47,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:08:48,139 INFO L134 CoverageAnalysis]: Checked inductivity of 867 backedges. 576 proven. 0 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2021-11-21 00:08:48,139 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-21 00:08:48,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1827461399] [2021-11-21 00:08:48,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1827461399] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-21 00:08:48,140 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:08:48,140 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-21 00:08:48,140 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663436] [2021-11-21 00:08:48,140 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-21 00:08:48,141 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:08:48,141 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-21 00:08:48,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:08:48,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:08:48,141 INFO L87 Difference]: Start difference. First operand 9504 states and 12885 transitions. Second operand has 7 states, 7 states have (on average 26.0) internal successors, (182), 7 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:08:50,154 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:08:52,177 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:08:57,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:08:57,571 INFO L93 Difference]: Finished difference Result 18885 states and 25516 transitions. [2021-11-21 00:08:57,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:08:57,572 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 26.0) internal successors, (182), 7 states have internal predecessors, (182), 0 states have call successors, (0), 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 305 [2021-11-21 00:08:57,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:08:57,583 INFO L225 Difference]: With dead ends: 18885 [2021-11-21 00:08:57,583 INFO L226 Difference]: Without dead ends: 8821 [2021-11-21 00:08:57,588 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 611 GetRequests, 602 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:08:57,589 INFO L933 BasicCegarLoop]: 157 mSDtfsCounter, 165 mSDsluCounter, 543 mSDsCounter, 0 mSdLazyCounter, 636 mSolverCounterSat, 57 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 700 SdHoareTripleChecker+Invalid, 695 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 636 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:08:57,589 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [165 Valid, 700 Invalid, 695 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 636 Invalid, 2 Unknown, 0 Unchecked, 8.7s Time] [2021-11-21 00:08:57,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8821 states. [2021-11-21 00:08:58,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8821 to 7095. [2021-11-21 00:08:58,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7095 states, 7094 states have (on average 1.3522695235410205) internal successors, (9593), 7094 states have internal predecessors, (9593), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:08:58,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7095 states to 7095 states and 9593 transitions. [2021-11-21 00:08:58,014 INFO L78 Accepts]: Start accepts. Automaton has 7095 states and 9593 transitions. Word has length 305 [2021-11-21 00:08:58,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:08:58,014 INFO L470 AbstractCegarLoop]: Abstraction has 7095 states and 9593 transitions. [2021-11-21 00:08:58,014 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 26.0) internal successors, (182), 7 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:08:58,014 INFO L276 IsEmpty]: Start isEmpty. Operand 7095 states and 9593 transitions. [2021-11-21 00:08:58,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 320 [2021-11-21 00:08:58,019 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:08:58,020 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:08:58,032 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-11-21 00:08:58,220 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-21 00:08:58,220 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:08:58,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:08:58,221 INFO L85 PathProgramCache]: Analyzing trace with hash -23101204, now seen corresponding path program 1 times [2021-11-21 00:08:58,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-21 00:08:58,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [293281411] [2021-11-21 00:08:58,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:08:58,223 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-21 00:08:58,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-21 00:08:58,224 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-21 00:08:58,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06120594-a61b-4afc-86ee-64c2a48b820f/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-21 00:08:59,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:08:59,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 714 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-21 00:08:59,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:09:00,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2021-11-21 00:09:00,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2021-11-21 00:09:00,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:00,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 79 treesize of output 63 [2021-11-21 00:09:00,820 INFO L354 Elim1Store]: treesize reduction 72, result has 40.0 percent of original size [2021-11-21 00:09:00,821 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 60 treesize of output 79 [2021-11-21 00:09:00,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:00,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 79 treesize of output 57 [2021-11-21 00:09:02,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:02,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 120 treesize of output 98 [2021-11-21 00:09:02,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:02,493 INFO L354 Elim1Store]: treesize reduction 127, result has 14.2 percent of original size [2021-11-21 00:09:02,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 101 treesize of output 91 [2021-11-21 00:09:02,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:02,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 60 [2021-11-21 00:09:02,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:02,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 75 [2021-11-21 00:09:02,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:02,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:02,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:02,681 INFO L354 Elim1Store]: treesize reduction 105, result has 29.1 percent of original size [2021-11-21 00:09:02,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 72 treesize of output 99 [2021-11-21 00:09:02,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:02,695 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 90 treesize of output 68 [2021-11-21 00:09:04,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:07,293 INFO L354 Elim1Store]: treesize reduction 148, result has 36.8 percent of original size [2021-11-21 00:09:07,294 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 218 treesize of output 227 [2021-11-21 00:09:07,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:07,700 INFO L354 Elim1Store]: treesize reduction 78, result has 43.5 percent of original size [2021-11-21 00:09:07,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 230 treesize of output 215 [2021-11-21 00:09:07,713 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:07,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:07,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:09,235 INFO L354 Elim1Store]: treesize reduction 132, result has 46.1 percent of original size [2021-11-21 00:09:09,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 212 treesize of output 281 [2021-11-21 00:09:27,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:27,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:27,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:28,198 INFO L354 Elim1Store]: treesize reduction 102, result has 25.0 percent of original size [2021-11-21 00:09:28,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 479 treesize of output 473 [2021-11-21 00:09:28,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:28,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:28,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:29,340 INFO L354 Elim1Store]: treesize reduction 138, result has 33.3 percent of original size [2021-11-21 00:09:29,341 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 476 treesize of output 460 [2021-11-21 00:09:29,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:29,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:29,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:29,733 INFO L354 Elim1Store]: treesize reduction 128, result has 33.7 percent of original size [2021-11-21 00:09:29,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 517 treesize of output 487 [2021-11-21 00:09:29,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:29,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:29,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:29,966 INFO L354 Elim1Store]: treesize reduction 158, result has 23.7 percent of original size [2021-11-21 00:09:29,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 560 treesize of output 504 [2021-11-21 00:09:29,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:29,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:29,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:09:30,201 INFO L354 Elim1Store]: treesize reduction 146, result has 24.4 percent of original size [2021-11-21 00:09:30,202 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 579 treesize of output 517