./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/openssl/s3_srvr.blast.06.i.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/openssl/s3_srvr.blast.06.i.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V --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 1fcf2e3f406244358dbdc63025b5201d61a26c4305d0f5c4a6ff65bb76c78282 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:05:22,935 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:05:22,937 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:05:22,983 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:05:22,984 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:05:22,987 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:05:22,989 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:05:22,993 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:05:22,996 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:05:23,001 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:05:23,003 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:05:23,005 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:05:23,005 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:05:23,008 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:05:23,011 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:05:23,018 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:05:23,018 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:05:23,019 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:05:23,021 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:05:23,023 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:05:23,025 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:05:23,026 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:05:23,028 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:05:23,028 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:05:23,032 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:05:23,032 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:05:23,032 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:05:23,033 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:05:23,034 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:05:23,035 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:05:23,035 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:05:23,036 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:05:23,037 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:05:23,038 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:05:23,039 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:05:23,039 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:05:23,040 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:05:23,040 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:05:23,041 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:05:23,042 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:05:23,043 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:05:23,044 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:05:23,073 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:05:23,073 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:05:23,073 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:05:23,073 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:05:23,074 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:05:23,074 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:05:23,074 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:05:23,075 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:05:23,075 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:05:23,075 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:05:23,075 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:05:23,076 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:05:23,076 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:05:23,076 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:05:23,076 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:05:23,077 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:05:23,077 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:05:23,077 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:05:23,078 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:05:23,078 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:05:23,078 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:05:23,078 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:05:23,079 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:05:23,079 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:05:23,079 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:05:23,079 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:05:23,080 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:05:23,080 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:05:23,080 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:05:23,080 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:05:23,081 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:05:23,081 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:05:23,081 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:05:23,081 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:05:23,082 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:05:23,082 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:05:23,082 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:05:23,082 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:05:23,082 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:05:23,083 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:05:23,083 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:05:23,083 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_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1fcf2e3f406244358dbdc63025b5201d61a26c4305d0f5c4a6ff65bb76c78282 [2021-11-23 02:05:23,363 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:05:23,382 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:05:23,385 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:05:23,386 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:05:23,387 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:05:23,389 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/openssl/s3_srvr.blast.06.i.cil-1.c [2021-11-23 02:05:23,447 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/data/393a25712/62f3b86995ae4724ac16bac37936f97e/FLAG5e3f9098e [2021-11-23 02:05:24,014 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:05:24,015 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/sv-benchmarks/c/openssl/s3_srvr.blast.06.i.cil-1.c [2021-11-23 02:05:24,042 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/data/393a25712/62f3b86995ae4724ac16bac37936f97e/FLAG5e3f9098e [2021-11-23 02:05:24,249 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/data/393a25712/62f3b86995ae4724ac16bac37936f97e [2021-11-23 02:05:24,252 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:05:24,254 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:05:24,260 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:05:24,261 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:05:24,264 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:05:24,266 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:05:24" (1/1) ... [2021-11-23 02:05:24,268 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@35e23974 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:05:24, skipping insertion in model container [2021-11-23 02:05:24,269 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:05:24" (1/1) ... [2021-11-23 02:05:24,277 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:05:24,354 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:05:24,792 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_89925ffd-3ae9-45f7-be0f-188db40ba8c8/sv-benchmarks/c/openssl/s3_srvr.blast.06.i.cil-1.c[78520,78533] [2021-11-23 02:05:24,801 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:05:24,814 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:05:24,939 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_89925ffd-3ae9-45f7-be0f-188db40ba8c8/sv-benchmarks/c/openssl/s3_srvr.blast.06.i.cil-1.c[78520,78533] [2021-11-23 02:05:24,942 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:05:24,965 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:05:24,966 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:05:24 WrapperNode [2021-11-23 02:05:24,966 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:05:24,967 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:05:24,967 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:05:24,968 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:05:24,977 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:05:24" (1/1) ... [2021-11-23 02:05:25,000 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:05:24" (1/1) ... [2021-11-23 02:05:25,064 INFO L137 Inliner]: procedures = 31, calls = 223, calls flagged for inlining = 7, calls inlined = 3, statements flattened = 815 [2021-11-23 02:05:25,065 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:05:25,066 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:05:25,066 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:05:25,066 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:05:25,074 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:05:24" (1/1) ... [2021-11-23 02:05:25,075 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:05:24" (1/1) ... [2021-11-23 02:05:25,104 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:05:24" (1/1) ... [2021-11-23 02:05:25,105 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:05:24" (1/1) ... [2021-11-23 02:05:25,175 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:05:24" (1/1) ... [2021-11-23 02:05:25,182 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:05:24" (1/1) ... [2021-11-23 02:05:25,195 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:05:24" (1/1) ... [2021-11-23 02:05:25,200 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:05:25,201 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:05:25,202 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:05:25,202 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:05:25,209 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:05:24" (1/1) ... [2021-11-23 02:05:25,245 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:05:25,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:05:25,268 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:05:25,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:05:25,313 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:05:25,313 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 02:05:25,313 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 02:05:25,313 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 02:05:25,314 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 02:05:25,314 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:05:25,314 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 02:05:25,314 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:05:25,314 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:05:25,500 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:05:25,502 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:05:25,520 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 02:05:28,522 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##90: assume false; [2021-11-23 02:05:28,523 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##91: assume !false; [2021-11-23 02:05:28,523 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:05:28,915 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:05:28,915 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 02:05:28,923 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:05:28 BoogieIcfgContainer [2021-11-23 02:05:28,923 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:05:28,927 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:05:28,927 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:05:28,931 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:05:28,931 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:05:24" (1/3) ... [2021-11-23 02:05:28,932 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@528626b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:05:28, skipping insertion in model container [2021-11-23 02:05:28,933 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:05:24" (2/3) ... [2021-11-23 02:05:28,933 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@528626b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:05:28, skipping insertion in model container [2021-11-23 02:05:28,933 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:05:28" (3/3) ... [2021-11-23 02:05:28,934 INFO L111 eAbstractionObserver]: Analyzing ICFG s3_srvr.blast.06.i.cil-1.c [2021-11-23 02:05:28,940 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:05:28,940 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:05:29,002 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:05:29,012 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 [2021-11-23 02:05:29,012 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:05:29,045 INFO L276 IsEmpty]: Start isEmpty. Operand has 111 states, 109 states have (on average 1.761467889908257) internal successors, (192), 110 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:29,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-23 02:05:29,056 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:29,057 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, 1] [2021-11-23 02:05:29,057 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:29,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:29,064 INFO L85 PathProgramCache]: Analyzing trace with hash 534178943, now seen corresponding path program 1 times [2021-11-23 02:05:29,074 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:29,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12726851] [2021-11-23 02:05:29,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:29,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:29,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:29,526 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:05:29,527 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:29,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [12726851] [2021-11-23 02:05:29,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [12726851] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:29,528 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:05:29,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:05:29,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163306625] [2021-11-23 02:05:29,531 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:29,535 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:05:29,535 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:29,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:05:29,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:05:29,566 INFO L87 Difference]: Start difference. First operand has 111 states, 109 states have (on average 1.761467889908257) internal successors, (192), 110 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 9.5) internal successors, (38), 3 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) [2021-11-23 02:05:31,591 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:32,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:32,129 INFO L93 Difference]: Finished difference Result 245 states and 424 transitions. [2021-11-23 02:05:32,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:05:32,133 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 3 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 38 [2021-11-23 02:05:32,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:32,147 INFO L225 Difference]: With dead ends: 245 [2021-11-23 02:05:32,147 INFO L226 Difference]: Without dead ends: 130 [2021-11-23 02:05:32,151 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 [2021-11-23 02:05:32,159 INFO L933 BasicCegarLoop]: 148 mSDtfsCounter, 20 mSDsluCounter, 272 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 391 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:32,165 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 391 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 174 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-23 02:05:32,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-23 02:05:32,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 118. [2021-11-23 02:05:32,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.547008547008547) internal successors, (181), 117 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) [2021-11-23 02:05:32,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 181 transitions. [2021-11-23 02:05:32,242 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 181 transitions. Word has length 38 [2021-11-23 02:05:32,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:32,243 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 181 transitions. [2021-11-23 02:05:32,244 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 3 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) [2021-11-23 02:05:32,244 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 181 transitions. [2021-11-23 02:05:32,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 02:05:32,248 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:32,249 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:32,249 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:05:32,250 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:32,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:32,251 INFO L85 PathProgramCache]: Analyzing trace with hash 909777623, now seen corresponding path program 1 times [2021-11-23 02:05:32,251 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:32,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1313243141] [2021-11-23 02:05:32,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:32,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:32,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:32,390 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:05:32,391 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:32,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1313243141] [2021-11-23 02:05:32,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1313243141] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:32,393 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:05:32,393 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:05:32,393 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988994874] [2021-11-23 02:05:32,394 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:32,396 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:05:32,396 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:32,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:05:32,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:05:32,397 INFO L87 Difference]: Start difference. First operand 118 states and 181 transitions. Second operand has 4 states, 4 states have (on average 12.0) internal successors, (48), 3 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:34,410 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:34,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:34,843 INFO L93 Difference]: Finished difference Result 236 states and 356 transitions. [2021-11-23 02:05:34,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:05:34,845 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 3 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-23 02:05:34,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:34,847 INFO L225 Difference]: With dead ends: 236 [2021-11-23 02:05:34,847 INFO L226 Difference]: Without dead ends: 130 [2021-11-23 02:05:34,851 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 [2021-11-23 02:05:34,852 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 19 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:34,852 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 323 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 162 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:05:34,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-23 02:05:34,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 118. [2021-11-23 02:05:34,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.5384615384615385) internal successors, (180), 117 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) [2021-11-23 02:05:34,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 180 transitions. [2021-11-23 02:05:34,861 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 180 transitions. Word has length 48 [2021-11-23 02:05:34,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:34,861 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 180 transitions. [2021-11-23 02:05:34,861 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 3 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:34,861 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 180 transitions. [2021-11-23 02:05:34,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 02:05:34,863 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:34,864 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:34,864 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:05:34,864 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:34,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:34,865 INFO L85 PathProgramCache]: Analyzing trace with hash -92685069, now seen corresponding path program 1 times [2021-11-23 02:05:34,865 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:34,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419371900] [2021-11-23 02:05:34,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:34,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:34,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:34,978 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:05:34,979 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:34,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419371900] [2021-11-23 02:05:34,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1419371900] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:34,979 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:05:34,979 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:05:34,980 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254214439] [2021-11-23 02:05:34,980 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:34,980 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:05:34,981 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:34,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:05:34,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:05:34,982 INFO L87 Difference]: Start difference. First operand 118 states and 180 transitions. Second operand has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:36,993 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:37,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:37,414 INFO L93 Difference]: Finished difference Result 236 states and 355 transitions. [2021-11-23 02:05:37,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:05:37,416 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-23 02:05:37,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:37,417 INFO L225 Difference]: With dead ends: 236 [2021-11-23 02:05:37,417 INFO L226 Difference]: Without dead ends: 130 [2021-11-23 02:05:37,418 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 [2021-11-23 02:05:37,420 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 17 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:37,421 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 322 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 163 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:05:37,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-23 02:05:37,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 118. [2021-11-23 02:05:37,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.5299145299145298) internal successors, (179), 117 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) [2021-11-23 02:05:37,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 179 transitions. [2021-11-23 02:05:37,433 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 179 transitions. Word has length 49 [2021-11-23 02:05:37,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:37,434 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 179 transitions. [2021-11-23 02:05:37,434 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:37,434 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 179 transitions. [2021-11-23 02:05:37,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 02:05:37,437 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:37,437 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:37,437 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:05:37,437 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:37,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:37,438 INFO L85 PathProgramCache]: Analyzing trace with hash -1088118805, now seen corresponding path program 1 times [2021-11-23 02:05:37,439 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:37,439 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1669583897] [2021-11-23 02:05:37,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:37,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:37,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:37,517 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:05:37,521 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:37,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1669583897] [2021-11-23 02:05:37,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1669583897] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:37,522 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:05:37,522 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:05:37,522 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628029423] [2021-11-23 02:05:37,522 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:37,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:05:37,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:37,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:05:37,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:05:37,524 INFO L87 Difference]: Start difference. First operand 118 states and 179 transitions. Second operand has 4 states, 4 states have (on average 12.5) internal successors, (50), 3 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:39,536 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:39,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:39,868 INFO L93 Difference]: Finished difference Result 236 states and 354 transitions. [2021-11-23 02:05:39,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:05:39,870 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 3 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-23 02:05:39,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:39,871 INFO L225 Difference]: With dead ends: 236 [2021-11-23 02:05:39,871 INFO L226 Difference]: Without dead ends: 130 [2021-11-23 02:05:39,872 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 [2021-11-23 02:05:39,875 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 15 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:39,875 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 322 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 163 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:05:39,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-23 02:05:39,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 118. [2021-11-23 02:05:39,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.5213675213675213) internal successors, (178), 117 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) [2021-11-23 02:05:39,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 178 transitions. [2021-11-23 02:05:39,886 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 178 transitions. Word has length 50 [2021-11-23 02:05:39,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:39,887 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 178 transitions. [2021-11-23 02:05:39,887 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 3 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:39,887 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 178 transitions. [2021-11-23 02:05:39,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 02:05:39,890 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:39,890 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:39,890 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:05:39,890 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:39,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:39,891 INFO L85 PathProgramCache]: Analyzing trace with hash 145488564, now seen corresponding path program 1 times [2021-11-23 02:05:39,891 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:39,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502448259] [2021-11-23 02:05:39,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:39,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:39,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:39,978 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:05:39,978 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:39,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502448259] [2021-11-23 02:05:39,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1502448259] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:39,979 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:05:39,979 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:05:39,980 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122115559] [2021-11-23 02:05:39,980 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:39,980 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:05:39,980 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:39,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:05:39,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:05:39,982 INFO L87 Difference]: Start difference. First operand 118 states and 178 transitions. Second operand has 4 states, 4 states have (on average 12.5) internal successors, (50), 3 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:42,008 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:42,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:42,336 INFO L93 Difference]: Finished difference Result 236 states and 353 transitions. [2021-11-23 02:05:42,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:05:42,337 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 3 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-23 02:05:42,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:42,338 INFO L225 Difference]: With dead ends: 236 [2021-11-23 02:05:42,339 INFO L226 Difference]: Without dead ends: 130 [2021-11-23 02:05:42,339 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 [2021-11-23 02:05:42,340 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 11 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:42,341 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 322 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 163 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:05:42,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-23 02:05:42,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 118. [2021-11-23 02:05:42,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.5128205128205128) internal successors, (177), 117 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) [2021-11-23 02:05:42,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 177 transitions. [2021-11-23 02:05:42,350 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 177 transitions. Word has length 50 [2021-11-23 02:05:42,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:42,350 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 177 transitions. [2021-11-23 02:05:42,351 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 3 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:42,351 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 177 transitions. [2021-11-23 02:05:42,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 02:05:42,358 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:42,359 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:42,359 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:05:42,359 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:42,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:42,360 INFO L85 PathProgramCache]: Analyzing trace with hash 510611372, now seen corresponding path program 1 times [2021-11-23 02:05:42,360 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:42,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764934656] [2021-11-23 02:05:42,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:42,361 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:42,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:42,426 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:05:42,426 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:42,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764934656] [2021-11-23 02:05:42,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [764934656] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:42,427 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:05:42,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:05:42,428 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111640759] [2021-11-23 02:05:42,428 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:42,428 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:05:42,428 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:42,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:05:42,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:05:42,429 INFO L87 Difference]: Start difference. First operand 118 states and 177 transitions. Second operand has 4 states, 4 states have (on average 12.5) internal successors, (50), 3 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:44,441 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:44,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:44,762 INFO L93 Difference]: Finished difference Result 236 states and 352 transitions. [2021-11-23 02:05:44,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:05:44,763 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 3 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-23 02:05:44,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:44,764 INFO L225 Difference]: With dead ends: 236 [2021-11-23 02:05:44,765 INFO L226 Difference]: Without dead ends: 130 [2021-11-23 02:05:44,765 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 [2021-11-23 02:05:44,766 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 9 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:44,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 323 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 162 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:05:44,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-23 02:05:44,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 118. [2021-11-23 02:05:44,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.5042735042735043) internal successors, (176), 117 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) [2021-11-23 02:05:44,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 176 transitions. [2021-11-23 02:05:44,775 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 176 transitions. Word has length 50 [2021-11-23 02:05:44,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:44,776 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 176 transitions. [2021-11-23 02:05:44,776 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 3 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:44,776 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 176 transitions. [2021-11-23 02:05:44,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 02:05:44,777 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:44,777 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:44,778 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:05:44,778 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:44,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:44,779 INFO L85 PathProgramCache]: Analyzing trace with hash 1281394044, now seen corresponding path program 1 times [2021-11-23 02:05:44,779 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:44,779 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [494253135] [2021-11-23 02:05:44,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:44,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:44,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:44,846 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:05:44,847 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:44,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [494253135] [2021-11-23 02:05:44,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [494253135] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:44,847 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:05:44,848 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:05:44,848 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494240528] [2021-11-23 02:05:44,848 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:44,848 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:05:44,849 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:44,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:05:44,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:05:44,850 INFO L87 Difference]: Start difference. First operand 118 states and 176 transitions. Second operand has 4 states, 4 states have (on average 12.75) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:46,860 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:47,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:47,119 INFO L93 Difference]: Finished difference Result 234 states and 349 transitions. [2021-11-23 02:05:47,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:05:47,120 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-23 02:05:47,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:47,121 INFO L225 Difference]: With dead ends: 234 [2021-11-23 02:05:47,121 INFO L226 Difference]: Without dead ends: 128 [2021-11-23 02:05:47,121 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 [2021-11-23 02:05:47,123 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 9 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:47,123 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 326 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 159 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:05:47,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-23 02:05:47,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 118. [2021-11-23 02:05:47,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.4957264957264957) internal successors, (175), 117 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) [2021-11-23 02:05:47,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 175 transitions. [2021-11-23 02:05:47,130 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 175 transitions. Word has length 51 [2021-11-23 02:05:47,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:47,131 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 175 transitions. [2021-11-23 02:05:47,131 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:47,131 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 175 transitions. [2021-11-23 02:05:47,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 02:05:47,132 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:47,132 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:47,132 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 02:05:47,133 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:47,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:47,133 INFO L85 PathProgramCache]: Analyzing trace with hash -1795561352, now seen corresponding path program 1 times [2021-11-23 02:05:47,134 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:47,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [651565005] [2021-11-23 02:05:47,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:47,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:47,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:47,237 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:05:47,239 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:47,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [651565005] [2021-11-23 02:05:47,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [651565005] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:47,239 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:05:47,243 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:05:47,243 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904325988] [2021-11-23 02:05:47,244 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:47,244 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:05:47,245 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:47,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:05:47,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:05:47,246 INFO L87 Difference]: Start difference. First operand 118 states and 175 transitions. Second operand has 4 states, 4 states have (on average 12.75) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:49,256 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:49,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:49,592 INFO L93 Difference]: Finished difference Result 234 states and 348 transitions. [2021-11-23 02:05:49,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:05:49,594 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-23 02:05:49,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:49,595 INFO L225 Difference]: With dead ends: 234 [2021-11-23 02:05:49,595 INFO L226 Difference]: Without dead ends: 128 [2021-11-23 02:05:49,595 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 [2021-11-23 02:05:49,596 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 11 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:49,596 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 326 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 159 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:05:49,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-23 02:05:49,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 118. [2021-11-23 02:05:49,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.4871794871794872) internal successors, (174), 117 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) [2021-11-23 02:05:49,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 174 transitions. [2021-11-23 02:05:49,602 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 174 transitions. Word has length 51 [2021-11-23 02:05:49,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:49,603 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 174 transitions. [2021-11-23 02:05:49,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:49,603 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 174 transitions. [2021-11-23 02:05:49,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 02:05:49,604 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:49,604 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:49,604 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 02:05:49,605 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:49,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:49,605 INFO L85 PathProgramCache]: Analyzing trace with hash 2129755664, now seen corresponding path program 1 times [2021-11-23 02:05:49,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:49,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055416705] [2021-11-23 02:05:49,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:49,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:49,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:49,660 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:05:49,661 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:49,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055416705] [2021-11-23 02:05:49,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055416705] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:49,661 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:05:49,661 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:05:49,662 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81234466] [2021-11-23 02:05:49,662 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:49,662 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:05:49,662 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:49,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:05:49,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:05:49,663 INFO L87 Difference]: Start difference. First operand 118 states and 174 transitions. Second operand has 4 states, 4 states have (on average 13.0) internal successors, (52), 3 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:51,674 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:51,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:51,969 INFO L93 Difference]: Finished difference Result 226 states and 337 transitions. [2021-11-23 02:05:51,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:05:51,970 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 3 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-23 02:05:51,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:51,971 INFO L225 Difference]: With dead ends: 226 [2021-11-23 02:05:51,972 INFO L226 Difference]: Without dead ends: 120 [2021-11-23 02:05:51,972 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 [2021-11-23 02:05:51,973 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 5 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 336 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:51,973 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 336 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 149 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:05:51,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-23 02:05:51,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 118. [2021-11-23 02:05:51,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.4786324786324787) internal successors, (173), 117 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) [2021-11-23 02:05:51,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 173 transitions. [2021-11-23 02:05:51,978 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 173 transitions. Word has length 52 [2021-11-23 02:05:51,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:51,978 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 173 transitions. [2021-11-23 02:05:51,978 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 3 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:51,979 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 173 transitions. [2021-11-23 02:05:51,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 02:05:51,979 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:51,979 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:51,980 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 02:05:51,980 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:51,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:51,980 INFO L85 PathProgramCache]: Analyzing trace with hash 312589639, now seen corresponding path program 1 times [2021-11-23 02:05:51,980 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:51,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [84880643] [2021-11-23 02:05:51,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:51,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:52,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:52,045 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:05:52,045 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:52,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [84880643] [2021-11-23 02:05:52,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [84880643] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:52,046 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:05:52,046 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:05:52,046 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305978775] [2021-11-23 02:05:52,046 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:52,046 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:05:52,047 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:52,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:05:52,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:05:52,048 INFO L87 Difference]: Start difference. First operand 118 states and 173 transitions. Second operand has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:54,059 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:54,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:54,414 INFO L93 Difference]: Finished difference Result 258 states and 385 transitions. [2021-11-23 02:05:54,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:05:54,416 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 0 states have call successors, (0), 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 53 [2021-11-23 02:05:54,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:54,418 INFO L225 Difference]: With dead ends: 258 [2021-11-23 02:05:54,418 INFO L226 Difference]: Without dead ends: 152 [2021-11-23 02:05:54,418 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 [2021-11-23 02:05:54,419 INFO L933 BasicCegarLoop]: 129 mSDtfsCounter, 21 mSDsluCounter, 228 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 9 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 331 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:54,419 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 331 Invalid, 188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 178 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:05:54,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-23 02:05:54,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 138. [2021-11-23 02:05:54,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 137 states have (on average 1.510948905109489) internal successors, (207), 137 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:54,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 207 transitions. [2021-11-23 02:05:54,425 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 207 transitions. Word has length 53 [2021-11-23 02:05:54,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:54,426 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 207 transitions. [2021-11-23 02:05:54,426 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:54,447 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 207 transitions. [2021-11-23 02:05:54,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 02:05:54,449 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:54,449 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:54,450 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 02:05:54,450 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:54,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:54,451 INFO L85 PathProgramCache]: Analyzing trace with hash -663973473, now seen corresponding path program 1 times [2021-11-23 02:05:54,451 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:54,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [890752934] [2021-11-23 02:05:54,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:54,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:54,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:54,542 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:05:54,542 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:54,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [890752934] [2021-11-23 02:05:54,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [890752934] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:54,543 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:05:54,543 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:05:54,543 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574773979] [2021-11-23 02:05:54,543 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:54,544 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:05:54,544 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:54,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:05:54,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:05:54,545 INFO L87 Difference]: Start difference. First operand 138 states and 207 transitions. Second operand has 4 states, 4 states have (on average 15.75) internal successors, (63), 4 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:56,557 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:56,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:56,890 INFO L93 Difference]: Finished difference Result 278 states and 418 transitions. [2021-11-23 02:05:56,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:05:56,892 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.75) internal successors, (63), 4 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2021-11-23 02:05:56,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:56,893 INFO L225 Difference]: With dead ends: 278 [2021-11-23 02:05:56,893 INFO L226 Difference]: Without dead ends: 152 [2021-11-23 02:05:56,893 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 [2021-11-23 02:05:56,894 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 32 mSDsluCounter, 228 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:56,894 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 333 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 175 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:05:56,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-23 02:05:56,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 138. [2021-11-23 02:05:56,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 137 states have (on average 1.5036496350364963) internal successors, (206), 137 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:56,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 206 transitions. [2021-11-23 02:05:56,900 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 206 transitions. Word has length 63 [2021-11-23 02:05:56,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:56,901 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 206 transitions. [2021-11-23 02:05:56,901 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.75) internal successors, (63), 4 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:56,901 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 206 transitions. [2021-11-23 02:05:56,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 02:05:56,902 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:56,902 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:56,902 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-23 02:05:56,902 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:56,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:56,903 INFO L85 PathProgramCache]: Analyzing trace with hash -1634328789, now seen corresponding path program 1 times [2021-11-23 02:05:56,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:56,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2074568220] [2021-11-23 02:05:56,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:56,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:56,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:56,991 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:05:56,991 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:56,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2074568220] [2021-11-23 02:05:56,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2074568220] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:56,992 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:05:56,992 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:05:56,992 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537921195] [2021-11-23 02:05:56,992 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:56,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:05:56,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:56,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:05:56,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:05:56,994 INFO L87 Difference]: Start difference. First operand 138 states and 206 transitions. Second operand has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:59,004 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:59,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:59,454 INFO L93 Difference]: Finished difference Result 281 states and 423 transitions. [2021-11-23 02:05:59,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:05:59,455 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-23 02:05:59,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:59,457 INFO L225 Difference]: With dead ends: 281 [2021-11-23 02:05:59,457 INFO L226 Difference]: Without dead ends: 155 [2021-11-23 02:05:59,457 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 [2021-11-23 02:05:59,458 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 122 mSDsluCounter, 181 mSDsCounter, 0 mSdLazyCounter, 280 mSolverCounterSat, 32 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 280 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:59,458 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 234 Invalid, 313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 280 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:05:59,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-23 02:05:59,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2021-11-23 02:05:59,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 153 states have (on average 1.477124183006536) internal successors, (226), 153 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:59,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 226 transitions. [2021-11-23 02:05:59,465 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 226 transitions. Word has length 64 [2021-11-23 02:05:59,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:59,466 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 226 transitions. [2021-11-23 02:05:59,466 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:05:59,466 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 226 transitions. [2021-11-23 02:05:59,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 02:05:59,467 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:59,467 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:59,467 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 02:05:59,468 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:59,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:59,468 INFO L85 PathProgramCache]: Analyzing trace with hash -1139187702, now seen corresponding path program 1 times [2021-11-23 02:05:59,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:59,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867580213] [2021-11-23 02:05:59,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:59,469 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:59,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:59,529 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:05:59,529 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:59,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867580213] [2021-11-23 02:05:59,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1867580213] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:59,530 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:05:59,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:05:59,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559786868] [2021-11-23 02:05:59,530 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:59,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:05:59,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:59,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:05:59,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:05:59,532 INFO L87 Difference]: Start difference. First operand 154 states and 226 transitions. Second operand has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:01,561 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:01,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:01,903 INFO L93 Difference]: Finished difference Result 310 states and 455 transitions. [2021-11-23 02:06:01,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:06:01,904 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 0 states have call successors, (0), 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 65 [2021-11-23 02:06:01,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:01,906 INFO L225 Difference]: With dead ends: 310 [2021-11-23 02:06:01,906 INFO L226 Difference]: Without dead ends: 168 [2021-11-23 02:06:01,906 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 [2021-11-23 02:06:01,907 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 30 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:01,907 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 333 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 175 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:06:01,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-23 02:06:01,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 154. [2021-11-23 02:06:01,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 153 states have (on average 1.4705882352941178) internal successors, (225), 153 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:01,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 225 transitions. [2021-11-23 02:06:01,915 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 225 transitions. Word has length 65 [2021-11-23 02:06:01,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:01,915 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 225 transitions. [2021-11-23 02:06:01,915 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:01,916 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 225 transitions. [2021-11-23 02:06:01,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 02:06:01,916 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:01,917 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:01,917 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 02:06:01,917 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:01,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:01,917 INFO L85 PathProgramCache]: Analyzing trace with hash -400826500, now seen corresponding path program 1 times [2021-11-23 02:06:01,918 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:01,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969126062] [2021-11-23 02:06:01,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:01,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:01,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:01,980 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:06:01,981 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:01,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969126062] [2021-11-23 02:06:01,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1969126062] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:01,981 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:01,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:06:01,982 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725764617] [2021-11-23 02:06:01,982 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:01,982 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:06:01,982 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:01,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:06:01,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:06:01,983 INFO L87 Difference]: Start difference. First operand 154 states and 225 transitions. Second operand has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:03,994 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:04,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:04,328 INFO L93 Difference]: Finished difference Result 310 states and 453 transitions. [2021-11-23 02:06:04,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:06:04,329 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 0 states have call successors, (0), 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 65 [2021-11-23 02:06:04,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:04,330 INFO L225 Difference]: With dead ends: 310 [2021-11-23 02:06:04,330 INFO L226 Difference]: Without dead ends: 168 [2021-11-23 02:06:04,331 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 [2021-11-23 02:06:04,331 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 25 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:04,332 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 333 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 175 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:06:04,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-23 02:06:04,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 154. [2021-11-23 02:06:04,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 153 states have (on average 1.4640522875816993) internal successors, (224), 153 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) [2021-11-23 02:06:04,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 224 transitions. [2021-11-23 02:06:04,341 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 224 transitions. Word has length 65 [2021-11-23 02:06:04,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:04,341 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 224 transitions. [2021-11-23 02:06:04,341 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:04,341 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 224 transitions. [2021-11-23 02:06:04,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 02:06:04,342 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:04,342 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:04,342 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 02:06:04,342 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:04,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:04,343 INFO L85 PathProgramCache]: Analyzing trace with hash -35703692, now seen corresponding path program 1 times [2021-11-23 02:06:04,343 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:04,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156915025] [2021-11-23 02:06:04,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:04,344 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:04,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:04,413 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:06:04,414 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:04,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156915025] [2021-11-23 02:06:04,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1156915025] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:04,414 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:04,414 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:06:04,415 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382456117] [2021-11-23 02:06:04,415 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:04,415 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:06:04,415 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:04,416 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:06:04,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:06:04,416 INFO L87 Difference]: Start difference. First operand 154 states and 224 transitions. Second operand has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:06,426 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:06,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:06,733 INFO L93 Difference]: Finished difference Result 310 states and 451 transitions. [2021-11-23 02:06:06,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:06:06,734 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 0 states have call successors, (0), 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 65 [2021-11-23 02:06:06,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:06,736 INFO L225 Difference]: With dead ends: 310 [2021-11-23 02:06:06,736 INFO L226 Difference]: Without dead ends: 168 [2021-11-23 02:06:06,736 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 [2021-11-23 02:06:06,737 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 23 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 334 SdHoareTripleChecker+Invalid, 183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:06,738 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 334 Invalid, 183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 174 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:06:06,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-23 02:06:06,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 154. [2021-11-23 02:06:06,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 153 states have (on average 1.457516339869281) internal successors, (223), 153 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) [2021-11-23 02:06:06,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 223 transitions. [2021-11-23 02:06:06,745 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 223 transitions. Word has length 65 [2021-11-23 02:06:06,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:06,745 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 223 transitions. [2021-11-23 02:06:06,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:06,746 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 223 transitions. [2021-11-23 02:06:06,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 02:06:06,747 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:06,747 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:06,747 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-23 02:06:06,747 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:06,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:06,748 INFO L85 PathProgramCache]: Analyzing trace with hash -1142445182, now seen corresponding path program 1 times [2021-11-23 02:06:06,748 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:06,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1625078035] [2021-11-23 02:06:06,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:06,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:06,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:06,838 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 21 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:06:06,838 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:06,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1625078035] [2021-11-23 02:06:06,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1625078035] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:06,841 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:06,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:06:06,841 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644211064] [2021-11-23 02:06:06,842 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:06,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:06:06,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:06,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:06:06,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:06:06,843 INFO L87 Difference]: Start difference. First operand 154 states and 223 transitions. Second operand has 4 states, 4 states have (on average 16.5) internal successors, (66), 4 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:08,854 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:09,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:09,197 INFO L93 Difference]: Finished difference Result 310 states and 449 transitions. [2021-11-23 02:06:09,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:06:09,199 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.5) internal successors, (66), 4 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-23 02:06:09,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:09,200 INFO L225 Difference]: With dead ends: 310 [2021-11-23 02:06:09,200 INFO L226 Difference]: Without dead ends: 168 [2021-11-23 02:06:09,201 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 [2021-11-23 02:06:09,201 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 27 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:09,202 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 333 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 175 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:06:09,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-23 02:06:09,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 154. [2021-11-23 02:06:09,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 153 states have (on average 1.4509803921568627) internal successors, (222), 153 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) [2021-11-23 02:06:09,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 222 transitions. [2021-11-23 02:06:09,210 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 222 transitions. Word has length 66 [2021-11-23 02:06:09,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:09,211 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 222 transitions. [2021-11-23 02:06:09,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.5) internal successors, (66), 4 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:09,211 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 222 transitions. [2021-11-23 02:06:09,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 02:06:09,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:09,212 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:09,212 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-23 02:06:09,212 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:09,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:09,213 INFO L85 PathProgramCache]: Analyzing trace with hash 1525496244, now seen corresponding path program 1 times [2021-11-23 02:06:09,213 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:09,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [443509620] [2021-11-23 02:06:09,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:09,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:09,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:09,287 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:06:09,287 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:09,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [443509620] [2021-11-23 02:06:09,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [443509620] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:09,287 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:09,288 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:06:09,288 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319433855] [2021-11-23 02:06:09,288 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:09,288 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:06:09,289 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:09,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:06:09,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:06:09,289 INFO L87 Difference]: Start difference. First operand 154 states and 222 transitions. Second operand has 4 states, 4 states have (on average 16.5) internal successors, (66), 4 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:11,300 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:11,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:11,633 INFO L93 Difference]: Finished difference Result 308 states and 445 transitions. [2021-11-23 02:06:11,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:06:11,634 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.5) internal successors, (66), 4 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-23 02:06:11,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:11,636 INFO L225 Difference]: With dead ends: 308 [2021-11-23 02:06:11,636 INFO L226 Difference]: Without dead ends: 166 [2021-11-23 02:06:11,636 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 [2021-11-23 02:06:11,637 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 22 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:11,637 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 337 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 171 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:06:11,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-23 02:06:11,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 154. [2021-11-23 02:06:11,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 153 states have (on average 1.4444444444444444) internal successors, (221), 153 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) [2021-11-23 02:06:11,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 221 transitions. [2021-11-23 02:06:11,644 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 221 transitions. Word has length 66 [2021-11-23 02:06:11,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:11,644 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 221 transitions. [2021-11-23 02:06:11,644 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.5) internal successors, (66), 4 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:11,644 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 221 transitions. [2021-11-23 02:06:11,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 02:06:11,645 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:11,645 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:11,646 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-23 02:06:11,646 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:11,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:11,647 INFO L85 PathProgramCache]: Analyzing trace with hash 1429771045, now seen corresponding path program 1 times [2021-11-23 02:06:11,647 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:11,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556172379] [2021-11-23 02:06:11,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:11,647 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:11,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:11,725 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:06:11,725 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:11,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556172379] [2021-11-23 02:06:11,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1556172379] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:11,725 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:11,726 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:06:11,726 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264992531] [2021-11-23 02:06:11,726 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:11,726 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:06:11,726 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:11,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:06:11,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:06:11,727 INFO L87 Difference]: Start difference. First operand 154 states and 221 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) [2021-11-23 02:06:13,738 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:14,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:14,042 INFO L93 Difference]: Finished difference Result 308 states and 443 transitions. [2021-11-23 02:06:14,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:06:14,044 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-23 02:06:14,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:14,045 INFO L225 Difference]: With dead ends: 308 [2021-11-23 02:06:14,045 INFO L226 Difference]: Without dead ends: 166 [2021-11-23 02:06:14,046 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 [2021-11-23 02:06:14,047 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 24 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:14,047 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 337 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 171 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:06:14,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-23 02:06:14,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 154. [2021-11-23 02:06:14,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 153 states have (on average 1.4379084967320261) internal successors, (220), 153 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) [2021-11-23 02:06:14,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 220 transitions. [2021-11-23 02:06:14,054 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 220 transitions. Word has length 67 [2021-11-23 02:06:14,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:14,054 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 220 transitions. [2021-11-23 02:06:14,054 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) [2021-11-23 02:06:14,054 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 220 transitions. [2021-11-23 02:06:14,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 02:06:14,055 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:14,055 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:14,056 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-23 02:06:14,056 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:14,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:14,057 INFO L85 PathProgramCache]: Analyzing trace with hash -2057673731, now seen corresponding path program 1 times [2021-11-23 02:06:14,057 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:14,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [800076961] [2021-11-23 02:06:14,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:14,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:14,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:14,112 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:06:14,112 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:14,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [800076961] [2021-11-23 02:06:14,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [800076961] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:14,113 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:14,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:06:14,113 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739109658] [2021-11-23 02:06:14,113 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:14,115 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:06:14,115 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:14,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:06:14,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:06:14,116 INFO L87 Difference]: Start difference. First operand 154 states and 220 transitions. Second operand has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:16,129 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:16,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:16,446 INFO L93 Difference]: Finished difference Result 300 states and 432 transitions. [2021-11-23 02:06:16,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:06:16,448 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 0 states have call successors, (0), 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 68 [2021-11-23 02:06:16,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:16,449 INFO L225 Difference]: With dead ends: 300 [2021-11-23 02:06:16,449 INFO L226 Difference]: Without dead ends: 158 [2021-11-23 02:06:16,449 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 [2021-11-23 02:06:16,450 INFO L933 BasicCegarLoop]: 137 mSDtfsCounter, 18 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:16,450 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 345 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 163 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:06:16,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-11-23 02:06:16,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 154. [2021-11-23 02:06:16,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 153 states have (on average 1.4313725490196079) internal successors, (219), 153 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) [2021-11-23 02:06:16,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 219 transitions. [2021-11-23 02:06:16,457 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 219 transitions. Word has length 68 [2021-11-23 02:06:16,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:16,458 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 219 transitions. [2021-11-23 02:06:16,458 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:16,458 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 219 transitions. [2021-11-23 02:06:16,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 02:06:16,459 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:16,460 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:16,460 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-23 02:06:16,460 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:16,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:16,461 INFO L85 PathProgramCache]: Analyzing trace with hash 1853676164, now seen corresponding path program 1 times [2021-11-23 02:06:16,461 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:16,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846510164] [2021-11-23 02:06:16,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:16,461 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:16,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:16,622 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:06:16,622 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:16,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846510164] [2021-11-23 02:06:16,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846510164] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:16,623 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:16,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:06:16,623 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030235862] [2021-11-23 02:06:16,623 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:16,624 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:06:16,624 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:16,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:06:16,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:06:16,625 INFO L87 Difference]: Start difference. First operand 154 states and 219 transitions. Second operand has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 6 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:18,639 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:19,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:19,347 INFO L93 Difference]: Finished difference Result 393 states and 571 transitions. [2021-11-23 02:06:19,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:06:19,348 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 6 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-23 02:06:19,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:19,350 INFO L225 Difference]: With dead ends: 393 [2021-11-23 02:06:19,350 INFO L226 Difference]: Without dead ends: 251 [2021-11-23 02:06:19,350 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:06:19,351 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 108 mSDsluCounter, 396 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 13 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 453 SdHoareTripleChecker+Invalid, 504 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:19,351 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 453 Invalid, 504 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 490 Invalid, 1 Unknown, 0 Unchecked, 2.7s Time] [2021-11-23 02:06:19,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2021-11-23 02:06:19,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 191. [2021-11-23 02:06:19,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 190 states have (on average 1.5052631578947369) internal successors, (286), 190 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:19,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 286 transitions. [2021-11-23 02:06:19,361 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 286 transitions. Word has length 71 [2021-11-23 02:06:19,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:19,361 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 286 transitions. [2021-11-23 02:06:19,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 6 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:19,362 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 286 transitions. [2021-11-23 02:06:19,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-23 02:06:19,363 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:19,363 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:19,363 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-23 02:06:19,363 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:19,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:19,364 INFO L85 PathProgramCache]: Analyzing trace with hash 1771238215, now seen corresponding path program 1 times [2021-11-23 02:06:19,364 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:19,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [100479346] [2021-11-23 02:06:19,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:19,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:19,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:19,490 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:06:19,491 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:19,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [100479346] [2021-11-23 02:06:19,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [100479346] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:19,491 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:19,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:06:19,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949717044] [2021-11-23 02:06:19,492 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:19,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:06:19,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:19,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:06:19,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:06:19,494 INFO L87 Difference]: Start difference. First operand 191 states and 286 transitions. Second operand has 6 states, 6 states have (on average 10.5) internal successors, (63), 6 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:21,511 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:22,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:22,118 INFO L93 Difference]: Finished difference Result 422 states and 626 transitions. [2021-11-23 02:06:22,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:06:22,119 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.5) internal successors, (63), 6 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-23 02:06:22,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:22,121 INFO L225 Difference]: With dead ends: 422 [2021-11-23 02:06:22,121 INFO L226 Difference]: Without dead ends: 243 [2021-11-23 02:06:22,122 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 [2021-11-23 02:06:22,122 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 180 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 382 mSolverCounterSat, 19 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 369 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 382 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:22,123 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [180 Valid, 369 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 382 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2021-11-23 02:06:22,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-11-23 02:06:22,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 192. [2021-11-23 02:06:22,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 191 states have (on average 1.5026178010471205) internal successors, (287), 191 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:22,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 287 transitions. [2021-11-23 02:06:22,134 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 287 transitions. Word has length 72 [2021-11-23 02:06:22,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:22,135 INFO L470 AbstractCegarLoop]: Abstraction has 192 states and 287 transitions. [2021-11-23 02:06:22,135 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.5) internal successors, (63), 6 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:22,135 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 287 transitions. [2021-11-23 02:06:22,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 02:06:22,136 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:22,138 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:22,139 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-23 02:06:22,139 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:22,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:22,140 INFO L85 PathProgramCache]: Analyzing trace with hash -731280953, now seen corresponding path program 1 times [2021-11-23 02:06:22,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:22,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1268133351] [2021-11-23 02:06:22,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:22,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:22,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:22,270 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:06:22,271 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:22,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1268133351] [2021-11-23 02:06:22,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1268133351] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:22,271 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:22,271 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:06:22,272 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353456429] [2021-11-23 02:06:22,272 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:22,272 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:06:22,272 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:22,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:06:22,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:06:22,273 INFO L87 Difference]: Start difference. First operand 192 states and 287 transitions. Second operand has 5 states, 5 states have (on average 13.8) internal successors, (69), 5 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:24,284 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:24,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:24,732 INFO L93 Difference]: Finished difference Result 475 states and 718 transitions. [2021-11-23 02:06:24,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:06:24,732 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.8) internal successors, (69), 5 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-23 02:06:24,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:24,734 INFO L225 Difference]: With dead ends: 475 [2021-11-23 02:06:24,734 INFO L226 Difference]: Without dead ends: 295 [2021-11-23 02:06:24,735 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:06:24,736 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 124 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 45 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 316 SdHoareTripleChecker+Invalid, 364 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:24,736 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [124 Valid, 316 Invalid, 364 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 318 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:06:24,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2021-11-23 02:06:24,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 229. [2021-11-23 02:06:24,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 228 states have (on average 1.5526315789473684) internal successors, (354), 228 states have internal predecessors, (354), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:24,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 354 transitions. [2021-11-23 02:06:24,747 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 354 transitions. Word has length 83 [2021-11-23 02:06:24,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:24,747 INFO L470 AbstractCegarLoop]: Abstraction has 229 states and 354 transitions. [2021-11-23 02:06:24,748 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.8) internal successors, (69), 5 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:24,748 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 354 transitions. [2021-11-23 02:06:24,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 02:06:24,749 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:24,749 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:24,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-23 02:06:24,750 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:24,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:24,750 INFO L85 PathProgramCache]: Analyzing trace with hash -1053021084, now seen corresponding path program 1 times [2021-11-23 02:06:24,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:24,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080970658] [2021-11-23 02:06:24,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:24,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:24,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:24,852 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:06:24,852 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:24,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080970658] [2021-11-23 02:06:24,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1080970658] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:24,853 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:24,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:06:24,853 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727448428] [2021-11-23 02:06:24,853 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:24,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:06:24,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:24,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:06:24,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:06:24,855 INFO L87 Difference]: Start difference. First operand 229 states and 354 transitions. Second operand has 5 states, 5 states have (on average 14.0) internal successors, (70), 5 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) [2021-11-23 02:06:26,865 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:27,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:27,267 INFO L93 Difference]: Finished difference Result 540 states and 840 transitions. [2021-11-23 02:06:27,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:06:27,268 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.0) internal successors, (70), 5 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 84 [2021-11-23 02:06:27,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:27,271 INFO L225 Difference]: With dead ends: 540 [2021-11-23 02:06:27,271 INFO L226 Difference]: Without dead ends: 323 [2021-11-23 02:06:27,271 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:06:27,272 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 216 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 94 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:27,272 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [216 Valid, 265 Invalid, 343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 248 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:06:27,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2021-11-23 02:06:27,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 220. [2021-11-23 02:06:27,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 219 states have (on average 1.5662100456621004) internal successors, (343), 219 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:27,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 343 transitions. [2021-11-23 02:06:27,283 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 343 transitions. Word has length 84 [2021-11-23 02:06:27,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:27,284 INFO L470 AbstractCegarLoop]: Abstraction has 220 states and 343 transitions. [2021-11-23 02:06:27,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 14.0) internal successors, (70), 5 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) [2021-11-23 02:06:27,284 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 343 transitions. [2021-11-23 02:06:27,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-23 02:06:27,285 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:27,285 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:27,286 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-23 02:06:27,286 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:27,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:27,286 INFO L85 PathProgramCache]: Analyzing trace with hash 478189140, now seen corresponding path program 1 times [2021-11-23 02:06:27,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:27,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147816784] [2021-11-23 02:06:27,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:27,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:27,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:27,398 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 78 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:06:27,398 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:27,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1147816784] [2021-11-23 02:06:27,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1147816784] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:27,399 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:27,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:06:27,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64507273] [2021-11-23 02:06:27,400 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:27,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:06:27,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:27,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:06:27,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:06:27,401 INFO L87 Difference]: Start difference. First operand 220 states and 343 transitions. Second operand has 6 states, 6 states have (on average 15.0) internal successors, (90), 6 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:29,443 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:30,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:30,084 INFO L93 Difference]: Finished difference Result 514 states and 802 transitions. [2021-11-23 02:06:30,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:06:30,085 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.0) internal successors, (90), 6 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 99 [2021-11-23 02:06:30,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:30,087 INFO L225 Difference]: With dead ends: 514 [2021-11-23 02:06:30,087 INFO L226 Difference]: Without dead ends: 306 [2021-11-23 02:06:30,088 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 [2021-11-23 02:06:30,088 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 88 mSDsluCounter, 400 mSDsCounter, 0 mSdLazyCounter, 484 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 496 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 484 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:30,089 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 459 Invalid, 496 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 484 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2021-11-23 02:06:30,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2021-11-23 02:06:30,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 250. [2021-11-23 02:06:30,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 249 states have (on average 1.5903614457831325) internal successors, (396), 249 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:30,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 396 transitions. [2021-11-23 02:06:30,101 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 396 transitions. Word has length 99 [2021-11-23 02:06:30,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:30,102 INFO L470 AbstractCegarLoop]: Abstraction has 250 states and 396 transitions. [2021-11-23 02:06:30,102 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.0) internal successors, (90), 6 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:30,102 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 396 transitions. [2021-11-23 02:06:30,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-23 02:06:30,103 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:30,104 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:30,104 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-23 02:06:30,104 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:30,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:30,105 INFO L85 PathProgramCache]: Analyzing trace with hash 1232510713, now seen corresponding path program 1 times [2021-11-23 02:06:30,105 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:30,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576828643] [2021-11-23 02:06:30,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:30,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:30,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:30,221 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 83 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:06:30,221 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:30,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576828643] [2021-11-23 02:06:30,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1576828643] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:30,222 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:30,222 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:06:30,222 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722246443] [2021-11-23 02:06:30,222 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:30,223 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:06:30,223 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:30,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:06:30,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:06:30,224 INFO L87 Difference]: Start difference. First operand 250 states and 396 transitions. Second operand has 6 states, 6 states have (on average 15.833333333333334) internal successors, (95), 6 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:32,234 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:32,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:32,860 INFO L93 Difference]: Finished difference Result 544 states and 854 transitions. [2021-11-23 02:06:32,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:06:32,861 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.833333333333334) internal successors, (95), 6 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-23 02:06:32,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:32,863 INFO L225 Difference]: With dead ends: 544 [2021-11-23 02:06:32,863 INFO L226 Difference]: Without dead ends: 306 [2021-11-23 02:06:32,864 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 [2021-11-23 02:06:32,864 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 92 mSDsluCounter, 400 mSDsCounter, 0 mSdLazyCounter, 484 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 496 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 484 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:32,865 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 459 Invalid, 496 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 484 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2021-11-23 02:06:32,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2021-11-23 02:06:32,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 255. [2021-11-23 02:06:32,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 254 states have (on average 1.594488188976378) internal successors, (405), 254 states have internal predecessors, (405), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:32,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 405 transitions. [2021-11-23 02:06:32,877 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 405 transitions. Word has length 104 [2021-11-23 02:06:32,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:32,878 INFO L470 AbstractCegarLoop]: Abstraction has 255 states and 405 transitions. [2021-11-23 02:06:32,878 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.833333333333334) internal successors, (95), 6 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:32,878 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 405 transitions. [2021-11-23 02:06:32,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-23 02:06:32,879 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:32,880 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:32,880 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-23 02:06:32,880 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:32,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:32,881 INFO L85 PathProgramCache]: Analyzing trace with hash -1610653898, now seen corresponding path program 1 times [2021-11-23 02:06:32,881 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:32,881 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797399086] [2021-11-23 02:06:32,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:32,881 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:32,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:32,997 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 84 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:06:32,998 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:32,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797399086] [2021-11-23 02:06:32,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [797399086] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:32,998 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:32,998 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:06:32,998 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614880943] [2021-11-23 02:06:32,999 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:32,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:06:32,999 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:33,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:06:33,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:06:33,001 INFO L87 Difference]: Start difference. First operand 255 states and 405 transitions. Second operand has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 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) [2021-11-23 02:06:35,012 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:35,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:35,585 INFO L93 Difference]: Finished difference Result 547 states and 860 transitions. [2021-11-23 02:06:35,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:06:35,586 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 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 105 [2021-11-23 02:06:35,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:35,587 INFO L225 Difference]: With dead ends: 547 [2021-11-23 02:06:35,587 INFO L226 Difference]: Without dead ends: 304 [2021-11-23 02:06:35,588 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 [2021-11-23 02:06:35,588 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 91 mSDsluCounter, 401 mSDsCounter, 0 mSdLazyCounter, 482 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 461 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 482 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:35,589 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 461 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 482 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-23 02:06:35,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2021-11-23 02:06:35,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 256. [2021-11-23 02:06:35,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 255 states have (on average 1.592156862745098) internal successors, (406), 255 states have internal predecessors, (406), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:35,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 406 transitions. [2021-11-23 02:06:35,601 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 406 transitions. Word has length 105 [2021-11-23 02:06:35,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:35,601 INFO L470 AbstractCegarLoop]: Abstraction has 256 states and 406 transitions. [2021-11-23 02:06:35,601 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 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) [2021-11-23 02:06:35,601 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 406 transitions. [2021-11-23 02:06:35,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-23 02:06:35,603 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:35,603 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:35,603 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-23 02:06:35,604 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:35,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:35,604 INFO L85 PathProgramCache]: Analyzing trace with hash 1774549349, now seen corresponding path program 1 times [2021-11-23 02:06:35,604 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:35,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325106063] [2021-11-23 02:06:35,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:35,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:35,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:35,714 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 85 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:06:35,714 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:35,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1325106063] [2021-11-23 02:06:35,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1325106063] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:35,714 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:35,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:06:35,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677610606] [2021-11-23 02:06:35,715 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:35,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:06:35,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:35,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:06:35,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:06:35,716 INFO L87 Difference]: Start difference. First operand 256 states and 406 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) [2021-11-23 02:06:37,728 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:38,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:38,251 INFO L93 Difference]: Finished difference Result 543 states and 853 transitions. [2021-11-23 02:06:38,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:06:38,252 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 110 [2021-11-23 02:06:38,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:38,254 INFO L225 Difference]: With dead ends: 543 [2021-11-23 02:06:38,254 INFO L226 Difference]: Without dead ends: 299 [2021-11-23 02:06:38,255 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 [2021-11-23 02:06:38,256 INFO L933 BasicCegarLoop]: 112 mSDtfsCounter, 117 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 370 mSolverCounterSat, 12 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 381 SdHoareTripleChecker+Invalid, 383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 370 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:38,256 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 381 Invalid, 383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 370 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-23 02:06:38,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-11-23 02:06:38,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 259. [2021-11-23 02:06:38,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 258 states have (on average 1.5852713178294573) internal successors, (409), 258 states have internal predecessors, (409), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:38,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 409 transitions. [2021-11-23 02:06:38,268 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 409 transitions. Word has length 110 [2021-11-23 02:06:38,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:38,268 INFO L470 AbstractCegarLoop]: Abstraction has 259 states and 409 transitions. [2021-11-23 02:06:38,269 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) [2021-11-23 02:06:38,269 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 409 transitions. [2021-11-23 02:06:38,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 02:06:38,270 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:38,270 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:38,271 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-11-23 02:06:38,271 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:38,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:38,271 INFO L85 PathProgramCache]: Analyzing trace with hash 361337623, now seen corresponding path program 1 times [2021-11-23 02:06:38,271 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:38,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917011254] [2021-11-23 02:06:38,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:38,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:38,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:38,381 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 90 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:06:38,381 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:38,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917011254] [2021-11-23 02:06:38,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917011254] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:38,382 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:38,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:06:38,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961184743] [2021-11-23 02:06:38,382 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:38,383 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:06:38,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:38,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:06:38,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:06:38,384 INFO L87 Difference]: Start difference. First operand 259 states and 409 transitions. Second operand has 5 states, 5 states have (on average 19.4) 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) [2021-11-23 02:06:40,394 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:40,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:40,915 INFO L93 Difference]: Finished difference Result 643 states and 1024 transitions. [2021-11-23 02:06:40,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:06:40,916 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.4) 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 111 [2021-11-23 02:06:40,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:40,918 INFO L225 Difference]: With dead ends: 643 [2021-11-23 02:06:40,919 INFO L226 Difference]: Without dead ends: 396 [2021-11-23 02:06:40,919 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:06:40,920 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 122 mSDsluCounter, 278 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 38 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 344 SdHoareTripleChecker+Invalid, 357 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:40,920 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 344 Invalid, 357 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 318 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-23 02:06:40,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 396 states. [2021-11-23 02:06:40,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 396 to 319. [2021-11-23 02:06:40,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 318 states have (on average 1.619496855345912) internal successors, (515), 318 states have internal predecessors, (515), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:40,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 515 transitions. [2021-11-23 02:06:40,935 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 515 transitions. Word has length 111 [2021-11-23 02:06:40,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:40,936 INFO L470 AbstractCegarLoop]: Abstraction has 319 states and 515 transitions. [2021-11-23 02:06:40,936 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.4) 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) [2021-11-23 02:06:40,936 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 515 transitions. [2021-11-23 02:06:40,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 02:06:40,938 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:40,938 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:40,938 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-11-23 02:06:40,939 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:40,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:40,939 INFO L85 PathProgramCache]: Analyzing trace with hash 310072201, now seen corresponding path program 1 times [2021-11-23 02:06:40,939 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:40,940 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [656430835] [2021-11-23 02:06:40,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:40,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:40,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:41,060 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 89 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:06:41,061 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:41,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [656430835] [2021-11-23 02:06:41,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [656430835] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:41,062 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:41,062 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:06:41,062 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140351901] [2021-11-23 02:06:41,062 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:41,062 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:06:41,063 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:41,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:06:41,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:06:41,064 INFO L87 Difference]: Start difference. First operand 319 states and 515 transitions. Second operand has 4 states, 4 states have (on average 19.25) internal successors, (77), 4 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:43,075 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:43,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:43,487 INFO L93 Difference]: Finished difference Result 662 states and 1062 transitions. [2021-11-23 02:06:43,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:06:43,488 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.25) internal successors, (77), 4 states have internal predecessors, (77), 0 states have call successors, (0), 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 111 [2021-11-23 02:06:43,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:43,491 INFO L225 Difference]: With dead ends: 662 [2021-11-23 02:06:43,491 INFO L226 Difference]: Without dead ends: 355 [2021-11-23 02:06:43,492 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 [2021-11-23 02:06:43,492 INFO L933 BasicCegarLoop]: 112 mSDtfsCounter, 77 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 295 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:43,493 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 295 Invalid, 259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 250 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:06:43,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 355 states. [2021-11-23 02:06:43,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 355 to 319. [2021-11-23 02:06:43,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 318 states have (on average 1.6163522012578617) internal successors, (514), 318 states have internal predecessors, (514), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:43,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 514 transitions. [2021-11-23 02:06:43,507 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 514 transitions. Word has length 111 [2021-11-23 02:06:43,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:43,508 INFO L470 AbstractCegarLoop]: Abstraction has 319 states and 514 transitions. [2021-11-23 02:06:43,508 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.25) internal successors, (77), 4 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:43,508 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 514 transitions. [2021-11-23 02:06:43,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 02:06:43,510 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:43,510 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:43,510 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-11-23 02:06:43,510 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:43,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:43,511 INFO L85 PathProgramCache]: Analyzing trace with hash 375290087, now seen corresponding path program 1 times [2021-11-23 02:06:43,511 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:43,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1327894195] [2021-11-23 02:06:43,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:43,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:43,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:43,606 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 93 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:06:43,607 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:43,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1327894195] [2021-11-23 02:06:43,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1327894195] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:43,607 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:43,607 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:06:43,607 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412929255] [2021-11-23 02:06:43,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:43,608 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:06:43,608 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:43,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:06:43,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:06:43,609 INFO L87 Difference]: Start difference. First operand 319 states and 514 transitions. Second operand has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:45,620 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:46,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:46,073 INFO L93 Difference]: Finished difference Result 660 states and 1058 transitions. [2021-11-23 02:06:46,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:06:46,074 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 0 states have call successors, (0), 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 112 [2021-11-23 02:06:46,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:46,076 INFO L225 Difference]: With dead ends: 660 [2021-11-23 02:06:46,077 INFO L226 Difference]: Without dead ends: 353 [2021-11-23 02:06:46,077 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 [2021-11-23 02:06:46,078 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 75 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:46,078 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 299 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 246 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:06:46,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2021-11-23 02:06:46,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 319. [2021-11-23 02:06:46,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 318 states have (on average 1.6132075471698113) internal successors, (513), 318 states have internal predecessors, (513), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:46,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 513 transitions. [2021-11-23 02:06:46,093 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 513 transitions. Word has length 112 [2021-11-23 02:06:46,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:46,093 INFO L470 AbstractCegarLoop]: Abstraction has 319 states and 513 transitions. [2021-11-23 02:06:46,093 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:46,093 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 513 transitions. [2021-11-23 02:06:46,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 02:06:46,095 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:46,095 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:46,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-11-23 02:06:46,096 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:46,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:46,096 INFO L85 PathProgramCache]: Analyzing trace with hash 124527638, now seen corresponding path program 1 times [2021-11-23 02:06:46,096 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:46,097 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872781107] [2021-11-23 02:06:46,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:46,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:46,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:46,242 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 95 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:06:46,242 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:46,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872781107] [2021-11-23 02:06:46,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [872781107] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:46,243 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:46,243 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:06:46,243 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938437539] [2021-11-23 02:06:46,244 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:46,244 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:06:46,244 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:46,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:06:46,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:06:46,245 INFO L87 Difference]: Start difference. First operand 319 states and 513 transitions. Second operand has 5 states, 5 states have (on average 20.4) internal successors, (102), 5 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) [2021-11-23 02:06:48,259 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:48,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:48,724 INFO L93 Difference]: Finished difference Result 729 states and 1167 transitions. [2021-11-23 02:06:48,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:06:48,725 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 20.4) internal successors, (102), 5 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 116 [2021-11-23 02:06:48,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:48,727 INFO L225 Difference]: With dead ends: 729 [2021-11-23 02:06:48,727 INFO L226 Difference]: Without dead ends: 422 [2021-11-23 02:06:48,728 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:06:48,729 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 217 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 92 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 217 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:48,729 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [217 Valid, 243 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 247 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-23 02:06:48,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 422 states. [2021-11-23 02:06:48,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 422 to 354. [2021-11-23 02:06:48,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 354 states, 353 states have (on average 1.6260623229461757) internal successors, (574), 353 states have internal predecessors, (574), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:48,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 354 states to 354 states and 574 transitions. [2021-11-23 02:06:48,744 INFO L78 Accepts]: Start accepts. Automaton has 354 states and 574 transitions. Word has length 116 [2021-11-23 02:06:48,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:48,745 INFO L470 AbstractCegarLoop]: Abstraction has 354 states and 574 transitions. [2021-11-23 02:06:48,745 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 20.4) internal successors, (102), 5 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) [2021-11-23 02:06:48,745 INFO L276 IsEmpty]: Start isEmpty. Operand 354 states and 574 transitions. [2021-11-23 02:06:48,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 02:06:48,747 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:48,747 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:48,748 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-11-23 02:06:48,748 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:48,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:48,748 INFO L85 PathProgramCache]: Analyzing trace with hash -1598390855, now seen corresponding path program 1 times [2021-11-23 02:06:48,749 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:48,749 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576278393] [2021-11-23 02:06:48,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:48,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:48,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:48,859 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 96 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:06:48,860 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:48,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576278393] [2021-11-23 02:06:48,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1576278393] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:48,860 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:48,860 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:06:48,861 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548135804] [2021-11-23 02:06:48,861 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:48,861 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:06:48,861 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:48,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:06:48,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:06:48,862 INFO L87 Difference]: Start difference. First operand 354 states and 574 transitions. Second operand has 5 states, 5 states have (on average 20.6) internal successors, (103), 5 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:50,873 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:51,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:51,336 INFO L93 Difference]: Finished difference Result 761 states and 1222 transitions. [2021-11-23 02:06:51,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:06:51,337 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 20.6) internal successors, (103), 5 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 117 [2021-11-23 02:06:51,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:51,339 INFO L225 Difference]: With dead ends: 761 [2021-11-23 02:06:51,339 INFO L226 Difference]: Without dead ends: 419 [2021-11-23 02:06:51,340 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:06:51,341 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 123 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 314 mSolverCounterSat, 49 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 316 SdHoareTripleChecker+Invalid, 364 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 314 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:51,341 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 316 Invalid, 364 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 314 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:06:51,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2021-11-23 02:06:51,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 354. [2021-11-23 02:06:51,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 354 states, 353 states have (on average 1.6203966005665722) internal successors, (572), 353 states have internal predecessors, (572), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:51,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 354 states to 354 states and 572 transitions. [2021-11-23 02:06:51,356 INFO L78 Accepts]: Start accepts. Automaton has 354 states and 572 transitions. Word has length 117 [2021-11-23 02:06:51,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:51,357 INFO L470 AbstractCegarLoop]: Abstraction has 354 states and 572 transitions. [2021-11-23 02:06:51,357 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 20.6) internal successors, (103), 5 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:51,357 INFO L276 IsEmpty]: Start isEmpty. Operand 354 states and 572 transitions. [2021-11-23 02:06:51,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-23 02:06:51,359 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:51,359 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:51,359 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-11-23 02:06:51,359 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:51,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:51,360 INFO L85 PathProgramCache]: Analyzing trace with hash -1227361086, now seen corresponding path program 1 times [2021-11-23 02:06:51,360 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:51,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922587961] [2021-11-23 02:06:51,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:51,361 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:51,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:51,506 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 02:06:51,506 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:51,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922587961] [2021-11-23 02:06:51,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922587961] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:51,506 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:51,507 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:06:51,507 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286137635] [2021-11-23 02:06:51,507 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:51,507 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:06:51,508 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:51,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:06:51,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:06:51,508 INFO L87 Difference]: Start difference. First operand 354 states and 572 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) [2021-11-23 02:06:53,519 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:53,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:53,873 INFO L93 Difference]: Finished difference Result 730 states and 1174 transitions. [2021-11-23 02:06:53,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:06:53,874 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 122 [2021-11-23 02:06:53,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:53,875 INFO L225 Difference]: With dead ends: 730 [2021-11-23 02:06:53,875 INFO L226 Difference]: Without dead ends: 388 [2021-11-23 02:06:53,876 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 [2021-11-23 02:06:53,877 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 79 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:53,877 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 299 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 246 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:06:53,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 388 states. [2021-11-23 02:06:53,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 388 to 354. [2021-11-23 02:06:53,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 354 states, 353 states have (on average 1.6175637393767706) internal successors, (571), 353 states have internal predecessors, (571), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:53,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 354 states to 354 states and 571 transitions. [2021-11-23 02:06:53,892 INFO L78 Accepts]: Start accepts. Automaton has 354 states and 571 transitions. Word has length 122 [2021-11-23 02:06:53,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:53,892 INFO L470 AbstractCegarLoop]: Abstraction has 354 states and 571 transitions. [2021-11-23 02:06:53,893 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) [2021-11-23 02:06:53,893 INFO L276 IsEmpty]: Start isEmpty. Operand 354 states and 571 transitions. [2021-11-23 02:06:53,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-23 02:06:53,894 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:53,894 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:53,895 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-11-23 02:06:53,895 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:53,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:53,895 INFO L85 PathProgramCache]: Analyzing trace with hash -1890493160, now seen corresponding path program 1 times [2021-11-23 02:06:53,896 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:53,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [701243542] [2021-11-23 02:06:53,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:53,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:53,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:53,973 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 109 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 02:06:53,973 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:53,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [701243542] [2021-11-23 02:06:53,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [701243542] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:53,974 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:53,974 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:06:53,974 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626886203] [2021-11-23 02:06:53,975 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:53,975 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:06:53,975 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:53,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:06:53,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:06:53,976 INFO L87 Difference]: Start difference. First operand 354 states and 571 transitions. Second operand has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:55,987 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:56,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:56,431 INFO L93 Difference]: Finished difference Result 776 states and 1248 transitions. [2021-11-23 02:06:56,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:06:56,432 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 122 [2021-11-23 02:06:56,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:56,434 INFO L225 Difference]: With dead ends: 776 [2021-11-23 02:06:56,434 INFO L226 Difference]: Without dead ends: 434 [2021-11-23 02:06:56,434 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 [2021-11-23 02:06:56,435 INFO L933 BasicCegarLoop]: 176 mSDtfsCounter, 57 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:56,435 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 425 Invalid, 298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 289 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:06:56,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2021-11-23 02:06:56,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 395. [2021-11-23 02:06:56,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 394 states have (on average 1.6269035532994924) internal successors, (641), 394 states have internal predecessors, (641), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:56,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 641 transitions. [2021-11-23 02:06:56,452 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 641 transitions. Word has length 122 [2021-11-23 02:06:56,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:56,452 INFO L470 AbstractCegarLoop]: Abstraction has 395 states and 641 transitions. [2021-11-23 02:06:56,452 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:56,453 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 641 transitions. [2021-11-23 02:06:56,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-23 02:06:56,454 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:56,454 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:56,455 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-11-23 02:06:56,455 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:56,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:56,455 INFO L85 PathProgramCache]: Analyzing trace with hash -34042012, now seen corresponding path program 1 times [2021-11-23 02:06:56,456 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:56,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [884748577] [2021-11-23 02:06:56,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:56,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:56,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:56,652 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 98 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:06:56,652 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:56,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [884748577] [2021-11-23 02:06:56,652 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [884748577] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:06:56,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [118539060] [2021-11-23 02:06:56,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:56,653 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:06:56,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:06:56,658 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:06:56,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:06:56,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:56,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 519 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:06:56,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:57,122 INFO L354 Elim1Store]: treesize reduction 74, result has 46.0 percent of original size [2021-11-23 02:06:57,123 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 [2021-11-23 02:06:57,135 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 [2021-11-23 02:06:57,146 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 [2021-11-23 02:06:57,211 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:06:57,270 INFO L354 Elim1Store]: treesize reduction 15, result has 6.3 percent of original size [2021-11-23 02:06:57,271 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 19 treesize of output 7 [2021-11-23 02:06:57,352 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 9 treesize of output 3 [2021-11-23 02:06:57,695 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 [2021-11-23 02:06:57,795 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 99 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:06:57,796 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:06:57,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [118539060] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:57,796 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:06:57,796 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [9] total 11 [2021-11-23 02:06:57,797 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354945156] [2021-11-23 02:06:57,797 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:57,797 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:06:57,798 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:57,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:06:57,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:06:57,799 INFO L87 Difference]: Start difference. First operand 395 states and 641 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) [2021-11-23 02:06:59,810 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:00,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:00,445 INFO L93 Difference]: Finished difference Result 858 states and 1388 transitions. [2021-11-23 02:07:00,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:00,446 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 123 [2021-11-23 02:07:00,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:00,449 INFO L225 Difference]: With dead ends: 858 [2021-11-23 02:07:00,449 INFO L226 Difference]: Without dead ends: 475 [2021-11-23 02:07:00,449 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:07:00,450 INFO L933 BasicCegarLoop]: 186 mSDtfsCounter, 57 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 443 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:00,450 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 443 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 291 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2021-11-23 02:07:00,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2021-11-23 02:07:00,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 395. [2021-11-23 02:07:00,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 394 states have (on average 1.6269035532994924) internal successors, (641), 394 states have internal predecessors, (641), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:00,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 641 transitions. [2021-11-23 02:07:00,469 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 641 transitions. Word has length 123 [2021-11-23 02:07:00,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:00,469 INFO L470 AbstractCegarLoop]: Abstraction has 395 states and 641 transitions. [2021-11-23 02:07:00,469 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) [2021-11-23 02:07:00,469 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 641 transitions. [2021-11-23 02:07:00,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-23 02:07:00,471 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:00,471 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:00,514 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:00,695 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-23 02:07:00,696 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:00,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:00,696 INFO L85 PathProgramCache]: Analyzing trace with hash -1637095882, now seen corresponding path program 1 times [2021-11-23 02:07:00,696 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:00,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885910178] [2021-11-23 02:07:00,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:00,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:00,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:00,776 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 123 proven. 0 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-23 02:07:00,776 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:00,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1885910178] [2021-11-23 02:07:00,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1885910178] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:00,777 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:00,777 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:00,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360815670] [2021-11-23 02:07:00,777 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:00,778 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:00,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:00,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:00,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:00,779 INFO L87 Difference]: Start difference. First operand 395 states and 641 transitions. Second operand has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:02,787 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:03,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:03,258 INFO L93 Difference]: Finished difference Result 858 states and 1387 transitions. [2021-11-23 02:07:03,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:03,259 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 123 [2021-11-23 02:07:03,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:03,261 INFO L225 Difference]: With dead ends: 858 [2021-11-23 02:07:03,261 INFO L226 Difference]: Without dead ends: 475 [2021-11-23 02:07:03,262 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 [2021-11-23 02:07:03,262 INFO L933 BasicCegarLoop]: 178 mSDtfsCounter, 83 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 427 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:03,263 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 427 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 286 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:07:03,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2021-11-23 02:07:03,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 409. [2021-11-23 02:07:03,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 409 states, 408 states have (on average 1.6225490196078431) internal successors, (662), 408 states have internal predecessors, (662), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:03,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 662 transitions. [2021-11-23 02:07:03,283 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 662 transitions. Word has length 123 [2021-11-23 02:07:03,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:03,283 INFO L470 AbstractCegarLoop]: Abstraction has 409 states and 662 transitions. [2021-11-23 02:07:03,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:03,284 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 662 transitions. [2021-11-23 02:07:03,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-23 02:07:03,285 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:03,285 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:03,286 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-11-23 02:07:03,286 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:03,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:03,286 INFO L85 PathProgramCache]: Analyzing trace with hash -347702097, now seen corresponding path program 1 times [2021-11-23 02:07:03,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:03,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [631907628] [2021-11-23 02:07:03,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:03,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:03,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:03,359 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 109 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 02:07:03,359 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:03,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [631907628] [2021-11-23 02:07:03,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [631907628] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:03,360 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:03,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:03,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438042751] [2021-11-23 02:07:03,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:03,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:03,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:03,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:03,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:03,362 INFO L87 Difference]: Start difference. First operand 409 states and 662 transitions. Second operand has 4 states, 4 states have (on average 25.75) internal successors, (103), 4 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:05,373 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:05,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:05,820 INFO L93 Difference]: Finished difference Result 870 states and 1405 transitions. [2021-11-23 02:07:05,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:05,821 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.75) internal successors, (103), 4 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 123 [2021-11-23 02:07:05,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:05,824 INFO L225 Difference]: With dead ends: 870 [2021-11-23 02:07:05,824 INFO L226 Difference]: Without dead ends: 471 [2021-11-23 02:07:05,825 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 [2021-11-23 02:07:05,826 INFO L933 BasicCegarLoop]: 178 mSDtfsCounter, 54 mSDsluCounter, 287 mSDsCounter, 0 mSdLazyCounter, 285 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 429 SdHoareTripleChecker+Invalid, 293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 285 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:05,826 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 429 Invalid, 293 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 285 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:07:05,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 471 states. [2021-11-23 02:07:05,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 471 to 435. [2021-11-23 02:07:05,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 435 states, 434 states have (on average 1.631336405529954) internal successors, (708), 434 states have internal predecessors, (708), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:05,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 708 transitions. [2021-11-23 02:07:05,847 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 708 transitions. Word has length 123 [2021-11-23 02:07:05,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:05,847 INFO L470 AbstractCegarLoop]: Abstraction has 435 states and 708 transitions. [2021-11-23 02:07:05,847 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.75) internal successors, (103), 4 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:05,847 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 708 transitions. [2021-11-23 02:07:05,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 02:07:05,849 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:05,849 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:05,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-11-23 02:07:05,850 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:05,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:05,850 INFO L85 PathProgramCache]: Analyzing trace with hash 78314858, now seen corresponding path program 1 times [2021-11-23 02:07:05,851 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:05,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [469230600] [2021-11-23 02:07:05,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:05,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:05,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:05,948 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 101 proven. 0 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 02:07:05,948 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:05,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [469230600] [2021-11-23 02:07:05,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [469230600] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:05,949 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:05,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:05,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318044990] [2021-11-23 02:07:05,949 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:05,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:05,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:05,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:05,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:05,951 INFO L87 Difference]: Start difference. First operand 435 states and 708 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) [2021-11-23 02:07:07,962 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:08,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:08,349 INFO L93 Difference]: Finished difference Result 892 states and 1446 transitions. [2021-11-23 02:07:08,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:08,350 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 124 [2021-11-23 02:07:08,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:08,352 INFO L225 Difference]: With dead ends: 892 [2021-11-23 02:07:08,352 INFO L226 Difference]: Without dead ends: 469 [2021-11-23 02:07:08,352 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 [2021-11-23 02:07:08,353 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 77 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:08,353 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 299 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 246 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:07:08,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2021-11-23 02:07:08,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 435. [2021-11-23 02:07:08,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 435 states, 434 states have (on average 1.6290322580645162) internal successors, (707), 434 states have internal predecessors, (707), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:08,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 707 transitions. [2021-11-23 02:07:08,373 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 707 transitions. Word has length 124 [2021-11-23 02:07:08,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:08,373 INFO L470 AbstractCegarLoop]: Abstraction has 435 states and 707 transitions. [2021-11-23 02:07:08,374 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) [2021-11-23 02:07:08,374 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 707 transitions. [2021-11-23 02:07:08,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 02:07:08,375 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:08,375 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:08,376 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-11-23 02:07:08,376 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:08,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:08,377 INFO L85 PathProgramCache]: Analyzing trace with hash 142621658, now seen corresponding path program 1 times [2021-11-23 02:07:08,377 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:08,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [980633389] [2021-11-23 02:07:08,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:08,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:08,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:08,446 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 128 proven. 0 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-23 02:07:08,446 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:08,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [980633389] [2021-11-23 02:07:08,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [980633389] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:08,447 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:08,447 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:08,447 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713579870] [2021-11-23 02:07:08,448 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:08,448 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:08,448 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:08,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:08,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:08,449 INFO L87 Difference]: Start difference. First operand 435 states and 707 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) [2021-11-23 02:07:10,460 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:10,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:10,950 INFO L93 Difference]: Finished difference Result 892 states and 1444 transitions. [2021-11-23 02:07:10,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:10,950 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 124 [2021-11-23 02:07:10,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:10,952 INFO L225 Difference]: With dead ends: 892 [2021-11-23 02:07:10,952 INFO L226 Difference]: Without dead ends: 469 [2021-11-23 02:07:10,953 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 [2021-11-23 02:07:10,953 INFO L933 BasicCegarLoop]: 179 mSDtfsCounter, 77 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 429 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:10,954 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 429 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 277 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-23 02:07:10,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2021-11-23 02:07:10,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 435. [2021-11-23 02:07:10,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 435 states, 434 states have (on average 1.6267281105990783) internal successors, (706), 434 states have internal predecessors, (706), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:10,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 706 transitions. [2021-11-23 02:07:10,972 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 706 transitions. Word has length 124 [2021-11-23 02:07:10,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:10,973 INFO L470 AbstractCegarLoop]: Abstraction has 435 states and 706 transitions. [2021-11-23 02:07:10,973 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) [2021-11-23 02:07:10,973 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 706 transitions. [2021-11-23 02:07:10,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-23 02:07:10,975 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:10,975 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:10,975 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-11-23 02:07:10,976 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:10,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:10,976 INFO L85 PathProgramCache]: Analyzing trace with hash 1418313318, now seen corresponding path program 1 times [2021-11-23 02:07:10,976 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:10,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [667932457] [2021-11-23 02:07:10,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:10,977 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:11,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:11,090 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 126 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:07:11,090 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:11,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [667932457] [2021-11-23 02:07:11,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [667932457] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:11,091 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:11,091 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:07:11,091 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745930984] [2021-11-23 02:07:11,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:11,091 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:07:11,092 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:11,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:07:11,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:07:11,092 INFO L87 Difference]: Start difference. First operand 435 states and 706 transitions. Second operand has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:13,103 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:13,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:13,666 INFO L93 Difference]: Finished difference Result 896 states and 1447 transitions. [2021-11-23 02:07:13,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:07:13,667 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 125 [2021-11-23 02:07:13,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:13,669 INFO L225 Difference]: With dead ends: 896 [2021-11-23 02:07:13,669 INFO L226 Difference]: Without dead ends: 473 [2021-11-23 02:07:13,669 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 [2021-11-23 02:07:13,670 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 107 mSDsluCounter, 334 mSDsCounter, 0 mSdLazyCounter, 391 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 407 SdHoareTripleChecker+Invalid, 403 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 391 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:13,670 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 407 Invalid, 403 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 391 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-23 02:07:13,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 473 states. [2021-11-23 02:07:13,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 473 to 435. [2021-11-23 02:07:13,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 435 states, 434 states have (on average 1.6244239631336406) internal successors, (705), 434 states have internal predecessors, (705), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:13,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 705 transitions. [2021-11-23 02:07:13,689 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 705 transitions. Word has length 125 [2021-11-23 02:07:13,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:13,690 INFO L470 AbstractCegarLoop]: Abstraction has 435 states and 705 transitions. [2021-11-23 02:07:13,690 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:13,690 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 705 transitions. [2021-11-23 02:07:13,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-23 02:07:13,691 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:13,692 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:13,692 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-11-23 02:07:13,692 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:13,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:13,693 INFO L85 PathProgramCache]: Analyzing trace with hash 1647690919, now seen corresponding path program 1 times [2021-11-23 02:07:13,693 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:13,693 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [42690086] [2021-11-23 02:07:13,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:13,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:13,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:13,787 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 106 proven. 0 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 02:07:13,788 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:13,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [42690086] [2021-11-23 02:07:13,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [42690086] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:13,788 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:13,788 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:13,788 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153420333] [2021-11-23 02:07:13,789 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:13,789 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:13,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:13,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:13,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:13,792 INFO L87 Difference]: Start difference. First operand 435 states and 705 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) [2021-11-23 02:07:15,803 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:16,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:16,171 INFO L93 Difference]: Finished difference Result 892 states and 1440 transitions. [2021-11-23 02:07:16,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:16,172 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 125 [2021-11-23 02:07:16,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:16,174 INFO L225 Difference]: With dead ends: 892 [2021-11-23 02:07:16,174 INFO L226 Difference]: Without dead ends: 469 [2021-11-23 02:07:16,175 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 [2021-11-23 02:07:16,175 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 74 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:16,176 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 299 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 246 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:07:16,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2021-11-23 02:07:16,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 435. [2021-11-23 02:07:16,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 435 states, 434 states have (on average 1.6221198156682028) internal successors, (704), 434 states have internal predecessors, (704), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:16,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 704 transitions. [2021-11-23 02:07:16,195 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 704 transitions. Word has length 125 [2021-11-23 02:07:16,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:16,195 INFO L470 AbstractCegarLoop]: Abstraction has 435 states and 704 transitions. [2021-11-23 02:07:16,195 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) [2021-11-23 02:07:16,196 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 704 transitions. [2021-11-23 02:07:16,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-23 02:07:16,197 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:16,197 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:16,198 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-11-23 02:07:16,198 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:16,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:16,198 INFO L85 PathProgramCache]: Analyzing trace with hash 304755237, now seen corresponding path program 1 times [2021-11-23 02:07:16,199 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:16,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338866003] [2021-11-23 02:07:16,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:16,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:16,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:16,311 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 111 proven. 0 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 02:07:16,311 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:16,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338866003] [2021-11-23 02:07:16,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [338866003] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:16,312 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:16,312 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:16,313 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190491282] [2021-11-23 02:07:16,313 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:16,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:16,313 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:16,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:16,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:16,314 INFO L87 Difference]: Start difference. First operand 435 states and 704 transitions. Second operand has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:18,325 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:18,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:18,646 INFO L93 Difference]: Finished difference Result 884 states and 1429 transitions. [2021-11-23 02:07:18,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:18,646 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 0 states have call successors, (0), 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 126 [2021-11-23 02:07:18,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:18,648 INFO L225 Difference]: With dead ends: 884 [2021-11-23 02:07:18,648 INFO L226 Difference]: Without dead ends: 461 [2021-11-23 02:07:18,649 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 [2021-11-23 02:07:18,649 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 68 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 307 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:18,650 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 307 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 238 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:07:18,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2021-11-23 02:07:18,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 435. [2021-11-23 02:07:18,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 435 states, 434 states have (on average 1.619815668202765) internal successors, (703), 434 states have internal predecessors, (703), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:18,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 703 transitions. [2021-11-23 02:07:18,666 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 703 transitions. Word has length 126 [2021-11-23 02:07:18,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:18,666 INFO L470 AbstractCegarLoop]: Abstraction has 435 states and 703 transitions. [2021-11-23 02:07:18,666 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:18,666 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 703 transitions. [2021-11-23 02:07:18,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-23 02:07:18,668 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:18,668 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:18,668 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-11-23 02:07:18,669 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:18,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:18,669 INFO L85 PathProgramCache]: Analyzing trace with hash 1542694628, now seen corresponding path program 1 times [2021-11-23 02:07:18,669 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:18,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027468580] [2021-11-23 02:07:18,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:18,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:18,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:18,778 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 128 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:07:18,778 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:18,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1027468580] [2021-11-23 02:07:18,778 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1027468580] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:18,779 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:18,779 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:07:18,779 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755934961] [2021-11-23 02:07:18,779 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:18,779 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:07:18,780 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:18,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:07:18,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:07:18,780 INFO L87 Difference]: Start difference. First operand 435 states and 703 transitions. Second operand has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 6 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:20,791 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:21,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:21,343 INFO L93 Difference]: Finished difference Result 886 states and 1430 transitions. [2021-11-23 02:07:21,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:07:21,344 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 6 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 126 [2021-11-23 02:07:21,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:21,346 INFO L225 Difference]: With dead ends: 886 [2021-11-23 02:07:21,346 INFO L226 Difference]: Without dead ends: 463 [2021-11-23 02:07:21,347 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 [2021-11-23 02:07:21,350 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 64 mSDsluCounter, 413 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 481 SdHoareTripleChecker+Invalid, 469 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:21,351 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 481 Invalid, 469 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 462 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-23 02:07:21,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2021-11-23 02:07:21,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 435. [2021-11-23 02:07:21,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 435 states, 434 states have (on average 1.6175115207373272) internal successors, (702), 434 states have internal predecessors, (702), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:21,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 702 transitions. [2021-11-23 02:07:21,371 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 702 transitions. Word has length 126 [2021-11-23 02:07:21,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:21,373 INFO L470 AbstractCegarLoop]: Abstraction has 435 states and 702 transitions. [2021-11-23 02:07:21,374 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 6 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:21,374 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 702 transitions. [2021-11-23 02:07:21,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-23 02:07:21,375 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:21,376 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:21,376 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-11-23 02:07:21,376 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:21,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:21,377 INFO L85 PathProgramCache]: Analyzing trace with hash 1878107245, now seen corresponding path program 1 times [2021-11-23 02:07:21,377 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:21,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672244517] [2021-11-23 02:07:21,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:21,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:21,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:21,521 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 122 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:07:21,521 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:21,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [672244517] [2021-11-23 02:07:21,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [672244517] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:21,522 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:21,522 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:07:21,522 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102698042] [2021-11-23 02:07:21,522 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:21,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:07:21,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:21,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:07:21,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:07:21,524 INFO L87 Difference]: Start difference. First operand 435 states and 702 transitions. Second operand has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:23,535 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:24,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:24,069 INFO L93 Difference]: Finished difference Result 886 states and 1428 transitions. [2021-11-23 02:07:24,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:07:24,070 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 128 [2021-11-23 02:07:24,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:24,073 INFO L225 Difference]: With dead ends: 886 [2021-11-23 02:07:24,073 INFO L226 Difference]: Without dead ends: 463 [2021-11-23 02:07:24,074 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 [2021-11-23 02:07:24,074 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 60 mSDsluCounter, 413 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 481 SdHoareTripleChecker+Invalid, 469 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:24,074 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 481 Invalid, 469 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 462 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-23 02:07:24,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2021-11-23 02:07:24,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 435. [2021-11-23 02:07:24,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 435 states, 434 states have (on average 1.6152073732718895) internal successors, (701), 434 states have internal predecessors, (701), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:24,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 701 transitions. [2021-11-23 02:07:24,103 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 701 transitions. Word has length 128 [2021-11-23 02:07:24,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:24,103 INFO L470 AbstractCegarLoop]: Abstraction has 435 states and 701 transitions. [2021-11-23 02:07:24,103 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:24,103 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 701 transitions. [2021-11-23 02:07:24,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-23 02:07:24,105 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:24,105 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:24,105 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-11-23 02:07:24,106 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:24,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:24,107 INFO L85 PathProgramCache]: Analyzing trace with hash -970481009, now seen corresponding path program 1 times [2021-11-23 02:07:24,107 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:24,107 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169143714] [2021-11-23 02:07:24,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:24,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:24,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:24,215 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 124 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:07:24,215 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:24,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169143714] [2021-11-23 02:07:24,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [169143714] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:24,216 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:24,216 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:07:24,216 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060365637] [2021-11-23 02:07:24,217 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:24,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:07:24,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:24,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:07:24,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:07:24,218 INFO L87 Difference]: Start difference. First operand 435 states and 701 transitions. Second operand has 6 states, 6 states have (on average 15.833333333333334) internal successors, (95), 6 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:26,225 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:26,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:26,632 INFO L93 Difference]: Finished difference Result 878 states and 1413 transitions. [2021-11-23 02:07:26,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:07:26,633 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.833333333333334) internal successors, (95), 6 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 129 [2021-11-23 02:07:26,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:26,635 INFO L225 Difference]: With dead ends: 878 [2021-11-23 02:07:26,635 INFO L226 Difference]: Without dead ends: 455 [2021-11-23 02:07:26,636 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 [2021-11-23 02:07:26,636 INFO L933 BasicCegarLoop]: 128 mSDtfsCounter, 103 mSDsluCounter, 327 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 413 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:26,636 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 413 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 338 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:07:26,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2021-11-23 02:07:26,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 435. [2021-11-23 02:07:26,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 435 states, 434 states have (on average 1.6129032258064515) internal successors, (700), 434 states have internal predecessors, (700), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:26,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 700 transitions. [2021-11-23 02:07:26,655 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 700 transitions. Word has length 129 [2021-11-23 02:07:26,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:26,656 INFO L470 AbstractCegarLoop]: Abstraction has 435 states and 700 transitions. [2021-11-23 02:07:26,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.833333333333334) internal successors, (95), 6 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:26,656 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 700 transitions. [2021-11-23 02:07:26,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-23 02:07:26,658 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:26,658 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 02:07:26,658 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-11-23 02:07:26,658 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:26,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:26,659 INFO L85 PathProgramCache]: Analyzing trace with hash 310661429, now seen corresponding path program 1 times [2021-11-23 02:07:26,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:26,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [616925072] [2021-11-23 02:07:26,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:26,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:26,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:26,727 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 108 proven. 0 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-23 02:07:26,727 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:26,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [616925072] [2021-11-23 02:07:26,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [616925072] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:26,727 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:26,728 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:26,728 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924107369] [2021-11-23 02:07:26,728 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:26,728 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:26,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:26,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:26,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:26,729 INFO L87 Difference]: Start difference. First operand 435 states and 700 transitions. Second operand has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:28,740 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:29,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:29,050 INFO L93 Difference]: Finished difference Result 901 states and 1451 transitions. [2021-11-23 02:07:29,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:29,051 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 131 [2021-11-23 02:07:29,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:29,053 INFO L225 Difference]: With dead ends: 901 [2021-11-23 02:07:29,054 INFO L226 Difference]: Without dead ends: 478 [2021-11-23 02:07:29,054 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 [2021-11-23 02:07:29,054 INFO L933 BasicCegarLoop]: 163 mSDtfsCounter, 29 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 397 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:29,055 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 397 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 208 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:07:29,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 478 states. [2021-11-23 02:07:29,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 478 to 459. [2021-11-23 02:07:29,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 458 states have (on average 1.6179039301310043) internal successors, (741), 458 states have internal predecessors, (741), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:29,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 741 transitions. [2021-11-23 02:07:29,075 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 741 transitions. Word has length 131 [2021-11-23 02:07:29,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:29,076 INFO L470 AbstractCegarLoop]: Abstraction has 459 states and 741 transitions. [2021-11-23 02:07:29,076 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:29,076 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 741 transitions. [2021-11-23 02:07:29,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-23 02:07:29,077 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:29,078 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:29,078 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-11-23 02:07:29,078 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:29,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:29,079 INFO L85 PathProgramCache]: Analyzing trace with hash -2120780359, now seen corresponding path program 1 times [2021-11-23 02:07:29,079 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:29,079 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [887323107] [2021-11-23 02:07:29,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:29,079 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:29,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:29,146 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 135 proven. 0 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-23 02:07:29,146 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:29,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [887323107] [2021-11-23 02:07:29,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [887323107] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:29,146 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:29,147 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:29,147 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667766901] [2021-11-23 02:07:29,147 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:29,147 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:29,148 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:29,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:29,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:29,148 INFO L87 Difference]: Start difference. First operand 459 states and 741 transitions. Second operand has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:31,159 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:31,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:31,453 INFO L93 Difference]: Finished difference Result 925 states and 1491 transitions. [2021-11-23 02:07:31,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:31,453 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 0 states have call successors, (0), 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 132 [2021-11-23 02:07:31,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:31,455 INFO L225 Difference]: With dead ends: 925 [2021-11-23 02:07:31,455 INFO L226 Difference]: Without dead ends: 478 [2021-11-23 02:07:31,456 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 [2021-11-23 02:07:31,456 INFO L933 BasicCegarLoop]: 164 mSDtfsCounter, 38 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 399 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:31,456 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 399 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 206 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:07:31,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 478 states. [2021-11-23 02:07:31,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 478 to 459. [2021-11-23 02:07:31,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 458 states have (on average 1.6157205240174672) internal successors, (740), 458 states have internal predecessors, (740), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:31,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 740 transitions. [2021-11-23 02:07:31,477 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 740 transitions. Word has length 132 [2021-11-23 02:07:31,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:31,477 INFO L470 AbstractCegarLoop]: Abstraction has 459 states and 740 transitions. [2021-11-23 02:07:31,478 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:31,478 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 740 transitions. [2021-11-23 02:07:31,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-23 02:07:31,479 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:31,479 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:31,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-11-23 02:07:31,480 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:31,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:31,480 INFO L85 PathProgramCache]: Analyzing trace with hash -1966695241, now seen corresponding path program 1 times [2021-11-23 02:07:31,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:31,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1790571048] [2021-11-23 02:07:31,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:31,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:31,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:31,567 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 140 proven. 0 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-23 02:07:31,567 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:31,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1790571048] [2021-11-23 02:07:31,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1790571048] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:31,567 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:31,568 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:31,568 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159633651] [2021-11-23 02:07:31,568 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:31,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:31,569 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:31,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:31,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:31,569 INFO L87 Difference]: Start difference. First operand 459 states and 740 transitions. Second operand has 4 states, 4 states have (on average 21.0) internal successors, (84), 4 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:33,581 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:33,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:33,870 INFO L93 Difference]: Finished difference Result 923 states and 1487 transitions. [2021-11-23 02:07:33,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:33,871 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.0) internal successors, (84), 4 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 133 [2021-11-23 02:07:33,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:33,873 INFO L225 Difference]: With dead ends: 923 [2021-11-23 02:07:33,873 INFO L226 Difference]: Without dead ends: 476 [2021-11-23 02:07:33,874 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 [2021-11-23 02:07:33,874 INFO L933 BasicCegarLoop]: 166 mSDtfsCounter, 36 mSDsluCounter, 270 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:33,875 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 403 Invalid, 210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 202 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:07:33,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2021-11-23 02:07:33,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 459. [2021-11-23 02:07:33,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 458 states have (on average 1.6135371179039302) internal successors, (739), 458 states have internal predecessors, (739), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:33,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 739 transitions. [2021-11-23 02:07:33,891 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 739 transitions. Word has length 133 [2021-11-23 02:07:33,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:33,892 INFO L470 AbstractCegarLoop]: Abstraction has 459 states and 739 transitions. [2021-11-23 02:07:33,892 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.0) internal successors, (84), 4 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:33,892 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 739 transitions. [2021-11-23 02:07:33,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 02:07:33,894 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:33,894 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:33,894 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-11-23 02:07:33,894 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:33,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:33,895 INFO L85 PathProgramCache]: Analyzing trace with hash 1173928572, now seen corresponding path program 1 times [2021-11-23 02:07:33,895 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:33,895 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1391332331] [2021-11-23 02:07:33,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:33,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:33,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:33,975 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 114 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-23 02:07:33,975 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:33,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1391332331] [2021-11-23 02:07:33,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1391332331] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:33,975 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:33,976 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:33,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324478761] [2021-11-23 02:07:33,976 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:33,976 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:33,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:33,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:33,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:33,977 INFO L87 Difference]: Start difference. First operand 459 states and 739 transitions. Second operand has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:35,992 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:36,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:36,339 INFO L93 Difference]: Finished difference Result 959 states and 1546 transitions. [2021-11-23 02:07:36,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:36,340 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 135 [2021-11-23 02:07:36,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:36,350 INFO L225 Difference]: With dead ends: 959 [2021-11-23 02:07:36,350 INFO L226 Difference]: Without dead ends: 512 [2021-11-23 02:07:36,351 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 [2021-11-23 02:07:36,351 INFO L933 BasicCegarLoop]: 173 mSDtfsCounter, 40 mSDsluCounter, 277 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 417 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:36,351 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 417 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 236 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:07:36,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 512 states. [2021-11-23 02:07:36,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 512 to 485. [2021-11-23 02:07:36,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 1.6198347107438016) internal successors, (784), 484 states have internal predecessors, (784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:36,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 784 transitions. [2021-11-23 02:07:36,371 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 784 transitions. Word has length 135 [2021-11-23 02:07:36,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:36,371 INFO L470 AbstractCegarLoop]: Abstraction has 485 states and 784 transitions. [2021-11-23 02:07:36,372 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:36,372 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 784 transitions. [2021-11-23 02:07:36,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 02:07:36,373 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:36,374 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:36,374 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2021-11-23 02:07:36,376 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:36,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:36,377 INFO L85 PathProgramCache]: Analyzing trace with hash 2021610535, now seen corresponding path program 1 times [2021-11-23 02:07:36,377 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:36,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134658064] [2021-11-23 02:07:36,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:36,378 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:36,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:36,500 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 136 proven. 0 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-23 02:07:36,500 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:36,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134658064] [2021-11-23 02:07:36,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134658064] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:36,501 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:36,501 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:07:36,501 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902214285] [2021-11-23 02:07:36,501 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:36,502 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:07:36,502 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:36,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:07:36,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:07:36,503 INFO L87 Difference]: Start difference. First operand 485 states and 784 transitions. Second operand has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 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) [2021-11-23 02:07:38,513 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:38,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:38,928 INFO L93 Difference]: Finished difference Result 978 states and 1579 transitions. [2021-11-23 02:07:38,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:07:38,929 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 135 [2021-11-23 02:07:38,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:38,931 INFO L225 Difference]: With dead ends: 978 [2021-11-23 02:07:38,931 INFO L226 Difference]: Without dead ends: 505 [2021-11-23 02:07:38,931 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 [2021-11-23 02:07:38,932 INFO L933 BasicCegarLoop]: 128 mSDtfsCounter, 77 mSDsluCounter, 327 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 413 SdHoareTripleChecker+Invalid, 346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:38,932 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 413 Invalid, 346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 338 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:07:38,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2021-11-23 02:07:38,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 485. [2021-11-23 02:07:38,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 1.6177685950413223) internal successors, (783), 484 states have internal predecessors, (783), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:38,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 783 transitions. [2021-11-23 02:07:38,954 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 783 transitions. Word has length 135 [2021-11-23 02:07:38,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:38,955 INFO L470 AbstractCegarLoop]: Abstraction has 485 states and 783 transitions. [2021-11-23 02:07:38,955 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 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) [2021-11-23 02:07:38,955 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 783 transitions. [2021-11-23 02:07:38,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 02:07:38,956 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:38,957 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:38,957 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-11-23 02:07:38,957 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:38,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:38,958 INFO L85 PathProgramCache]: Analyzing trace with hash 1944664825, now seen corresponding path program 1 times [2021-11-23 02:07:38,958 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:38,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746227038] [2021-11-23 02:07:38,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:38,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:38,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:39,050 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 136 proven. 0 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-23 02:07:39,050 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:39,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746227038] [2021-11-23 02:07:39,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [746227038] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:39,051 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:39,051 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:39,052 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511888094] [2021-11-23 02:07:39,052 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:39,052 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:39,052 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:39,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:39,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:39,053 INFO L87 Difference]: Start difference. First operand 485 states and 783 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) [2021-11-23 02:07:41,061 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:41,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:41,427 INFO L93 Difference]: Finished difference Result 992 states and 1596 transitions. [2021-11-23 02:07:41,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:41,428 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 135 [2021-11-23 02:07:41,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:41,430 INFO L225 Difference]: With dead ends: 992 [2021-11-23 02:07:41,430 INFO L226 Difference]: Without dead ends: 519 [2021-11-23 02:07:41,431 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 [2021-11-23 02:07:41,431 INFO L933 BasicCegarLoop]: 150 mSDtfsCounter, 81 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 371 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:41,431 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 371 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 267 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:07:41,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 519 states. [2021-11-23 02:07:41,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 519 to 485. [2021-11-23 02:07:41,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 1.615702479338843) internal successors, (782), 484 states have internal predecessors, (782), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:41,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 782 transitions. [2021-11-23 02:07:41,445 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 782 transitions. Word has length 135 [2021-11-23 02:07:41,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:41,445 INFO L470 AbstractCegarLoop]: Abstraction has 485 states and 782 transitions. [2021-11-23 02:07:41,446 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) [2021-11-23 02:07:41,446 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 782 transitions. [2021-11-23 02:07:41,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 02:07:41,447 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:41,447 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:41,447 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-11-23 02:07:41,447 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:41,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:41,447 INFO L85 PathProgramCache]: Analyzing trace with hash -1129302702, now seen corresponding path program 1 times [2021-11-23 02:07:41,448 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:41,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1754102173] [2021-11-23 02:07:41,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:41,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:41,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:41,515 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 139 proven. 0 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-23 02:07:41,516 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:41,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1754102173] [2021-11-23 02:07:41,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1754102173] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:41,516 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:41,516 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:41,516 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099647090] [2021-11-23 02:07:41,517 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:41,517 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:41,517 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:41,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:41,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:41,518 INFO L87 Difference]: Start difference. First operand 485 states and 782 transitions. Second operand has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:43,529 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:43,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:43,913 INFO L93 Difference]: Finished difference Result 985 states and 1586 transitions. [2021-11-23 02:07:43,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:43,914 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 136 [2021-11-23 02:07:43,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:43,916 INFO L225 Difference]: With dead ends: 985 [2021-11-23 02:07:43,916 INFO L226 Difference]: Without dead ends: 512 [2021-11-23 02:07:43,917 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 [2021-11-23 02:07:43,917 INFO L933 BasicCegarLoop]: 172 mSDtfsCounter, 51 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 415 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:43,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 415 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 234 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:07:43,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 512 states. [2021-11-23 02:07:43,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 512 to 485. [2021-11-23 02:07:43,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 1.6136363636363635) internal successors, (781), 484 states have internal predecessors, (781), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:43,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 781 transitions. [2021-11-23 02:07:43,934 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 781 transitions. Word has length 136 [2021-11-23 02:07:43,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:43,934 INFO L470 AbstractCegarLoop]: Abstraction has 485 states and 781 transitions. [2021-11-23 02:07:43,935 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:43,935 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 781 transitions. [2021-11-23 02:07:43,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 02:07:43,936 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:43,936 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:43,936 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2021-11-23 02:07:43,937 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:43,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:43,937 INFO L85 PathProgramCache]: Analyzing trace with hash -1930597462, now seen corresponding path program 1 times [2021-11-23 02:07:43,937 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:43,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1016101674] [2021-11-23 02:07:43,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:43,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:43,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:44,038 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 138 proven. 0 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-23 02:07:44,038 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:44,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1016101674] [2021-11-23 02:07:44,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1016101674] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:44,039 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:44,039 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:07:44,039 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507223639] [2021-11-23 02:07:44,039 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:44,040 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:07:44,040 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:44,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:07:44,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:07:44,041 INFO L87 Difference]: Start difference. First operand 485 states and 781 transitions. Second operand has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:46,052 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:46,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:46,570 INFO L93 Difference]: Finished difference Result 976 states and 1571 transitions. [2021-11-23 02:07:46,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:07:46,571 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 136 [2021-11-23 02:07:46,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:46,573 INFO L225 Difference]: With dead ends: 976 [2021-11-23 02:07:46,573 INFO L226 Difference]: Without dead ends: 503 [2021-11-23 02:07:46,574 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 [2021-11-23 02:07:46,574 INFO L933 BasicCegarLoop]: 129 mSDtfsCounter, 55 mSDsluCounter, 423 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 499 SdHoareTripleChecker+Invalid, 451 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:46,575 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 499 Invalid, 451 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 444 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-23 02:07:46,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 503 states. [2021-11-23 02:07:46,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 503 to 485. [2021-11-23 02:07:46,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 1.6115702479338843) internal successors, (780), 484 states have internal predecessors, (780), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:46,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 780 transitions. [2021-11-23 02:07:46,597 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 780 transitions. Word has length 136 [2021-11-23 02:07:46,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:46,598 INFO L470 AbstractCegarLoop]: Abstraction has 485 states and 780 transitions. [2021-11-23 02:07:46,598 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:46,598 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 780 transitions. [2021-11-23 02:07:46,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 02:07:46,599 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:46,600 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 6, 6, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:46,600 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-11-23 02:07:46,600 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:46,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:46,601 INFO L85 PathProgramCache]: Analyzing trace with hash 2123951069, now seen corresponding path program 1 times [2021-11-23 02:07:46,601 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:46,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1151017302] [2021-11-23 02:07:46,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:46,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:46,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:46,685 INFO L134 CoverageAnalysis]: Checked inductivity of 219 backedges. 142 proven. 0 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-23 02:07:46,686 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:46,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1151017302] [2021-11-23 02:07:46,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1151017302] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:46,686 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:46,686 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:46,686 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704266583] [2021-11-23 02:07:46,687 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:46,687 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:46,687 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:46,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:46,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:46,688 INFO L87 Difference]: Start difference. First operand 485 states and 780 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) [2021-11-23 02:07:48,697 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:49,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:49,054 INFO L93 Difference]: Finished difference Result 992 states and 1590 transitions. [2021-11-23 02:07:49,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:49,054 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 136 [2021-11-23 02:07:49,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:49,057 INFO L225 Difference]: With dead ends: 992 [2021-11-23 02:07:49,057 INFO L226 Difference]: Without dead ends: 519 [2021-11-23 02:07:49,057 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 [2021-11-23 02:07:49,058 INFO L933 BasicCegarLoop]: 148 mSDtfsCounter, 79 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 367 SdHoareTripleChecker+Invalid, 272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:49,058 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 367 Invalid, 272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 264 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:07:49,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 519 states. [2021-11-23 02:07:49,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 519 to 485. [2021-11-23 02:07:49,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 1.609504132231405) internal successors, (779), 484 states have internal predecessors, (779), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:49,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 779 transitions. [2021-11-23 02:07:49,072 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 779 transitions. Word has length 136 [2021-11-23 02:07:49,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:49,072 INFO L470 AbstractCegarLoop]: Abstraction has 485 states and 779 transitions. [2021-11-23 02:07:49,072 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) [2021-11-23 02:07:49,073 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 779 transitions. [2021-11-23 02:07:49,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-23 02:07:49,074 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:49,074 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:49,074 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-11-23 02:07:49,074 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:49,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:49,075 INFO L85 PathProgramCache]: Analyzing trace with hash -1295658946, now seen corresponding path program 1 times [2021-11-23 02:07:49,075 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:49,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426926494] [2021-11-23 02:07:49,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:49,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:49,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:49,146 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 144 proven. 0 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-23 02:07:49,146 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:49,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426926494] [2021-11-23 02:07:49,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [426926494] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:49,147 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:49,147 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:49,147 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599725620] [2021-11-23 02:07:49,147 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:49,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:49,148 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:49,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:49,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:49,149 INFO L87 Difference]: Start difference. First operand 485 states and 779 transitions. Second operand has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:51,161 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:51,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:51,502 INFO L93 Difference]: Finished difference Result 983 states and 1578 transitions. [2021-11-23 02:07:51,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:51,502 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 137 [2021-11-23 02:07:51,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:51,504 INFO L225 Difference]: With dead ends: 983 [2021-11-23 02:07:51,505 INFO L226 Difference]: Without dead ends: 510 [2021-11-23 02:07:51,505 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 [2021-11-23 02:07:51,505 INFO L933 BasicCegarLoop]: 172 mSDtfsCounter, 49 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 415 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:51,506 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 415 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 229 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:07:51,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 510 states. [2021-11-23 02:07:51,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 510 to 485. [2021-11-23 02:07:51,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 1.6074380165289257) internal successors, (778), 484 states have internal predecessors, (778), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:51,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 778 transitions. [2021-11-23 02:07:51,529 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 778 transitions. Word has length 137 [2021-11-23 02:07:51,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:51,529 INFO L470 AbstractCegarLoop]: Abstraction has 485 states and 778 transitions. [2021-11-23 02:07:51,529 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:51,529 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 778 transitions. [2021-11-23 02:07:51,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-23 02:07:51,531 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:51,531 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:51,531 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2021-11-23 02:07:51,531 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:51,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:51,532 INFO L85 PathProgramCache]: Analyzing trace with hash 408526419, now seen corresponding path program 1 times [2021-11-23 02:07:51,532 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:51,532 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337573973] [2021-11-23 02:07:51,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:51,533 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:51,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:51,603 INFO L134 CoverageAnalysis]: Checked inductivity of 219 backedges. 162 proven. 0 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-23 02:07:51,603 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:51,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [337573973] [2021-11-23 02:07:51,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [337573973] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:51,604 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:51,604 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:51,604 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450882369] [2021-11-23 02:07:51,604 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:51,605 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:51,605 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:51,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:51,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:51,606 INFO L87 Difference]: Start difference. First operand 485 states and 778 transitions. Second operand has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:53,617 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:53,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:53,967 INFO L93 Difference]: Finished difference Result 992 states and 1586 transitions. [2021-11-23 02:07:53,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:53,967 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 137 [2021-11-23 02:07:53,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:53,970 INFO L225 Difference]: With dead ends: 992 [2021-11-23 02:07:53,970 INFO L226 Difference]: Without dead ends: 519 [2021-11-23 02:07:53,970 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 [2021-11-23 02:07:53,971 INFO L933 BasicCegarLoop]: 148 mSDtfsCounter, 61 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 367 SdHoareTripleChecker+Invalid, 272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:53,971 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 367 Invalid, 272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 264 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:07:53,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 519 states. [2021-11-23 02:07:53,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 519 to 485. [2021-11-23 02:07:53,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 1.6053719008264462) internal successors, (777), 484 states have internal predecessors, (777), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:53,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 777 transitions. [2021-11-23 02:07:53,990 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 777 transitions. Word has length 137 [2021-11-23 02:07:53,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:53,990 INFO L470 AbstractCegarLoop]: Abstraction has 485 states and 777 transitions. [2021-11-23 02:07:53,990 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:53,990 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 777 transitions. [2021-11-23 02:07:53,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-23 02:07:53,991 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:53,991 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 6, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:53,991 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2021-11-23 02:07:53,991 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:53,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:53,992 INFO L85 PathProgramCache]: Analyzing trace with hash 637904020, now seen corresponding path program 1 times [2021-11-23 02:07:53,992 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:53,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1954778648] [2021-11-23 02:07:53,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:53,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:54,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:54,063 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 148 proven. 0 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-23 02:07:54,063 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:54,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1954778648] [2021-11-23 02:07:54,063 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1954778648] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:54,063 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:54,064 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:54,064 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766862887] [2021-11-23 02:07:54,064 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:54,064 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:54,065 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:54,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:54,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:54,065 INFO L87 Difference]: Start difference. First operand 485 states and 777 transitions. Second operand has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:56,077 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:56,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:56,445 INFO L93 Difference]: Finished difference Result 992 states and 1584 transitions. [2021-11-23 02:07:56,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:56,445 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 137 [2021-11-23 02:07:56,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:56,447 INFO L225 Difference]: With dead ends: 992 [2021-11-23 02:07:56,448 INFO L226 Difference]: Without dead ends: 519 [2021-11-23 02:07:56,448 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 [2021-11-23 02:07:56,448 INFO L933 BasicCegarLoop]: 148 mSDtfsCounter, 76 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 367 SdHoareTripleChecker+Invalid, 272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:56,449 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 367 Invalid, 272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 264 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:07:56,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 519 states. [2021-11-23 02:07:56,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 519 to 485. [2021-11-23 02:07:56,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 1.603305785123967) internal successors, (776), 484 states have internal predecessors, (776), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:56,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 776 transitions. [2021-11-23 02:07:56,464 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 776 transitions. Word has length 137 [2021-11-23 02:07:56,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:56,465 INFO L470 AbstractCegarLoop]: Abstraction has 485 states and 776 transitions. [2021-11-23 02:07:56,465 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:56,465 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 776 transitions. [2021-11-23 02:07:56,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 02:07:56,466 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:56,466 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:56,466 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-11-23 02:07:56,467 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:56,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:56,467 INFO L85 PathProgramCache]: Analyzing trace with hash -933867560, now seen corresponding path program 1 times [2021-11-23 02:07:56,467 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:56,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429665903] [2021-11-23 02:07:56,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:56,468 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:56,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:56,528 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 154 proven. 0 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-23 02:07:56,529 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:56,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429665903] [2021-11-23 02:07:56,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [429665903] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:56,529 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:56,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:56,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036900528] [2021-11-23 02:07:56,530 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:56,530 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:56,530 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:56,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:56,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:56,531 INFO L87 Difference]: Start difference. First operand 485 states and 776 transitions. Second operand has 4 states, 4 states have (on average 21.0) internal successors, (84), 4 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:58,543 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:58,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:58,910 INFO L93 Difference]: Finished difference Result 984 states and 1573 transitions. [2021-11-23 02:07:58,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:58,911 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.0) internal successors, (84), 4 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 138 [2021-11-23 02:07:58,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:58,913 INFO L225 Difference]: With dead ends: 984 [2021-11-23 02:07:58,914 INFO L226 Difference]: Without dead ends: 511 [2021-11-23 02:07:58,914 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 [2021-11-23 02:07:58,914 INFO L933 BasicCegarLoop]: 152 mSDtfsCounter, 70 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:58,914 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 375 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 256 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:07:58,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 511 states. [2021-11-23 02:07:58,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 511 to 485. [2021-11-23 02:07:58,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 1.6012396694214877) internal successors, (775), 484 states have internal predecessors, (775), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:58,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 775 transitions. [2021-11-23 02:07:58,929 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 775 transitions. Word has length 138 [2021-11-23 02:07:58,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:58,930 INFO L470 AbstractCegarLoop]: Abstraction has 485 states and 775 transitions. [2021-11-23 02:07:58,930 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.0) internal successors, (84), 4 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:58,930 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 775 transitions. [2021-11-23 02:07:58,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 02:07:58,931 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:58,932 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:58,932 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2021-11-23 02:07:58,932 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:58,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:58,933 INFO L85 PathProgramCache]: Analyzing trace with hash 304071831, now seen corresponding path program 1 times [2021-11-23 02:07:58,933 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:58,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426251177] [2021-11-23 02:07:58,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:58,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:58,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:59,005 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 164 proven. 0 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-23 02:07:59,005 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:59,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426251177] [2021-11-23 02:07:59,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [426251177] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:59,006 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:59,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:59,006 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [76352868] [2021-11-23 02:07:59,006 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:59,006 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:59,007 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:59,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:59,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:59,007 INFO L87 Difference]: Start difference. First operand 485 states and 775 transitions. Second operand has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:01,018 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:01,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:01,356 INFO L93 Difference]: Finished difference Result 982 states and 1569 transitions. [2021-11-23 02:08:01,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:08:01,357 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 138 [2021-11-23 02:08:01,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:01,359 INFO L225 Difference]: With dead ends: 982 [2021-11-23 02:08:01,359 INFO L226 Difference]: Without dead ends: 509 [2021-11-23 02:08:01,359 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 [2021-11-23 02:08:01,360 INFO L933 BasicCegarLoop]: 153 mSDtfsCounter, 52 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 377 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:01,360 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 377 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 254 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:08:01,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 509 states. [2021-11-23 02:08:01,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 509 to 485. [2021-11-23 02:08:01,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 1.5991735537190082) internal successors, (774), 484 states have internal predecessors, (774), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:01,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 774 transitions. [2021-11-23 02:08:01,377 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 774 transitions. Word has length 138 [2021-11-23 02:08:01,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:01,377 INFO L470 AbstractCegarLoop]: Abstraction has 485 states and 774 transitions. [2021-11-23 02:08:01,377 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:01,378 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 774 transitions. [2021-11-23 02:08:01,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 02:08:01,379 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:01,379 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:01,379 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2021-11-23 02:08:01,380 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:01,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:01,380 INFO L85 PathProgramCache]: Analyzing trace with hash -2090629622, now seen corresponding path program 1 times [2021-11-23 02:08:01,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:08:01,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1785289917] [2021-11-23 02:08:01,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:01,380 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:08:01,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:01,462 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 121 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-23 02:08:01,463 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:01,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1785289917] [2021-11-23 02:08:01,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1785289917] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:08:01,463 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:08:01,463 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:08:01,463 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909949845] [2021-11-23 02:08:01,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:08:01,464 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:08:01,464 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:01,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:08:01,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:08:01,466 INFO L87 Difference]: Start difference. First operand 485 states and 774 transitions. Second operand has 4 states, 4 states have (on average 24.75) internal successors, (99), 4 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:03,477 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:03,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:03,776 INFO L93 Difference]: Finished difference Result 989 states and 1581 transitions. [2021-11-23 02:08:03,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:08:03,777 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.75) internal successors, (99), 4 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-23 02:08:03,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:03,781 INFO L225 Difference]: With dead ends: 989 [2021-11-23 02:08:03,781 INFO L226 Difference]: Without dead ends: 516 [2021-11-23 02:08:03,782 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:08:03,782 INFO L933 BasicCegarLoop]: 156 mSDtfsCounter, 19 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 383 SdHoareTripleChecker+Invalid, 193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:03,782 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 383 Invalid, 193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 184 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:08:03,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 516 states. [2021-11-23 02:08:03,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 516 to 504. [2021-11-23 02:08:03,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 1.6003976143141152) internal successors, (805), 503 states have internal predecessors, (805), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:03,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 805 transitions. [2021-11-23 02:08:03,809 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 805 transitions. Word has length 140 [2021-11-23 02:08:03,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:03,809 INFO L470 AbstractCegarLoop]: Abstraction has 504 states and 805 transitions. [2021-11-23 02:08:03,809 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.75) internal successors, (99), 4 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:03,809 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 805 transitions. [2021-11-23 02:08:03,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 02:08:03,811 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:03,811 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:03,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-11-23 02:08:03,811 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:03,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:03,813 INFO L85 PathProgramCache]: Analyzing trace with hash 1267540320, now seen corresponding path program 1 times [2021-11-23 02:08:03,813 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:08:03,813 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476581921] [2021-11-23 02:08:03,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:03,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:08:03,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:03,893 INFO L134 CoverageAnalysis]: Checked inductivity of 215 backedges. 158 proven. 0 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-23 02:08:03,893 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:03,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476581921] [2021-11-23 02:08:03,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1476581921] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:08:03,894 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:08:03,894 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:08:03,894 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389401495] [2021-11-23 02:08:03,894 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:08:03,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:08:03,895 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:03,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:08:03,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:08:03,895 INFO L87 Difference]: Start difference. First operand 504 states and 805 transitions. Second operand has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:05,906 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:06,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:06,251 INFO L93 Difference]: Finished difference Result 1020 states and 1629 transitions. [2021-11-23 02:08:06,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:08:06,252 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-23 02:08:06,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:06,254 INFO L225 Difference]: With dead ends: 1020 [2021-11-23 02:08:06,254 INFO L226 Difference]: Without dead ends: 528 [2021-11-23 02:08:06,255 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 [2021-11-23 02:08:06,255 INFO L933 BasicCegarLoop]: 153 mSDtfsCounter, 54 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 377 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:06,255 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 377 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 254 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:08:06,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2021-11-23 02:08:06,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 504. [2021-11-23 02:08:06,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 1.5984095427435387) internal successors, (804), 503 states have internal predecessors, (804), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:06,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 804 transitions. [2021-11-23 02:08:06,281 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 804 transitions. Word has length 140 [2021-11-23 02:08:06,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:06,282 INFO L470 AbstractCegarLoop]: Abstraction has 504 states and 804 transitions. [2021-11-23 02:08:06,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:06,282 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 804 transitions. [2021-11-23 02:08:06,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-23 02:08:06,283 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:06,283 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:06,283 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2021-11-23 02:08:06,283 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:06,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:06,284 INFO L85 PathProgramCache]: Analyzing trace with hash -66463617, now seen corresponding path program 1 times [2021-11-23 02:08:06,284 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:08:06,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664335853] [2021-11-23 02:08:06,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:06,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:08:06,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:06,352 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 135 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 02:08:06,352 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:06,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664335853] [2021-11-23 02:08:06,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [664335853] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:08:06,353 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:08:06,353 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:08:06,353 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31865882] [2021-11-23 02:08:06,354 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:08:06,354 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:08:06,354 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:06,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:08:06,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:08:06,355 INFO L87 Difference]: Start difference. First operand 504 states and 804 transitions. Second operand has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:08,366 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:08,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:08,819 INFO L93 Difference]: Finished difference Result 1064 states and 1698 transitions. [2021-11-23 02:08:08,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:08:08,820 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 141 [2021-11-23 02:08:08,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:08,823 INFO L225 Difference]: With dead ends: 1064 [2021-11-23 02:08:08,823 INFO L226 Difference]: Without dead ends: 572 [2021-11-23 02:08:08,823 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 [2021-11-23 02:08:08,824 INFO L933 BasicCegarLoop]: 177 mSDtfsCounter, 51 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:08,824 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 425 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 266 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:08:08,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2021-11-23 02:08:08,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 537. [2021-11-23 02:08:08,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 537 states, 536 states have (on average 1.6082089552238805) internal successors, (862), 536 states have internal predecessors, (862), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:08,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537 states to 537 states and 862 transitions. [2021-11-23 02:08:08,851 INFO L78 Accepts]: Start accepts. Automaton has 537 states and 862 transitions. Word has length 141 [2021-11-23 02:08:08,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:08,851 INFO L470 AbstractCegarLoop]: Abstraction has 537 states and 862 transitions. [2021-11-23 02:08:08,851 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:08,851 INFO L276 IsEmpty]: Start isEmpty. Operand 537 states and 862 transitions. [2021-11-23 02:08:08,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-23 02:08:08,853 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:08,853 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:08,853 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2021-11-23 02:08:08,853 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:08,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:08,854 INFO L85 PathProgramCache]: Analyzing trace with hash 748608388, now seen corresponding path program 1 times [2021-11-23 02:08:08,854 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:08:08,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442754697] [2021-11-23 02:08:08,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:08,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:08:08,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:08,926 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 152 proven. 0 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-23 02:08:08,926 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:08,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442754697] [2021-11-23 02:08:08,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [442754697] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:08:08,927 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:08:08,927 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:08:08,927 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248910258] [2021-11-23 02:08:08,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:08:08,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:08:08,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:08,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:08:08,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:08:08,929 INFO L87 Difference]: Start difference. First operand 537 states and 862 transitions. Second operand has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:10,940 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:11,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:11,332 INFO L93 Difference]: Finished difference Result 1074 states and 1725 transitions. [2021-11-23 02:08:11,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:08:11,333 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 141 [2021-11-23 02:08:11,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:11,336 INFO L225 Difference]: With dead ends: 1074 [2021-11-23 02:08:11,336 INFO L226 Difference]: Without dead ends: 549 [2021-11-23 02:08:11,336 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 [2021-11-23 02:08:11,337 INFO L933 BasicCegarLoop]: 159 mSDtfsCounter, 23 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 389 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 183 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:11,337 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 389 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 183 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:08:11,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 549 states. [2021-11-23 02:08:11,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 549 to 537. [2021-11-23 02:08:11,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 537 states, 536 states have (on average 1.6063432835820894) internal successors, (861), 536 states have internal predecessors, (861), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:11,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537 states to 537 states and 861 transitions. [2021-11-23 02:08:11,366 INFO L78 Accepts]: Start accepts. Automaton has 537 states and 861 transitions. Word has length 141 [2021-11-23 02:08:11,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:11,366 INFO L470 AbstractCegarLoop]: Abstraction has 537 states and 861 transitions. [2021-11-23 02:08:11,366 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:11,366 INFO L276 IsEmpty]: Start isEmpty. Operand 537 states and 861 transitions. [2021-11-23 02:08:11,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-23 02:08:11,368 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:11,368 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:11,368 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2021-11-23 02:08:11,368 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:11,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:11,369 INFO L85 PathProgramCache]: Analyzing trace with hash 1576780796, now seen corresponding path program 1 times [2021-11-23 02:08:11,369 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:08:11,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844041668] [2021-11-23 02:08:11,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:11,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:08:11,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:11,434 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 160 proven. 0 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-23 02:08:11,434 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:11,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844041668] [2021-11-23 02:08:11,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1844041668] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:08:11,434 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:08:11,435 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:08:11,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85211546] [2021-11-23 02:08:11,435 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:08:11,435 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:08:11,435 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:11,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:08:11,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:08:11,436 INFO L87 Difference]: Start difference. First operand 537 states and 861 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) [2021-11-23 02:08:13,453 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:13,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:13,832 INFO L93 Difference]: Finished difference Result 1078 states and 1728 transitions. [2021-11-23 02:08:13,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:08:13,833 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 141 [2021-11-23 02:08:13,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:13,835 INFO L225 Difference]: With dead ends: 1078 [2021-11-23 02:08:13,835 INFO L226 Difference]: Without dead ends: 553 [2021-11-23 02:08:13,836 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 [2021-11-23 02:08:13,836 INFO L933 BasicCegarLoop]: 161 mSDtfsCounter, 43 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 393 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:13,837 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 393 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 238 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:08:13,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 553 states. [2021-11-23 02:08:13,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 553 to 537. [2021-11-23 02:08:13,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 537 states, 536 states have (on average 1.6044776119402986) internal successors, (860), 536 states have internal predecessors, (860), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:13,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537 states to 537 states and 860 transitions. [2021-11-23 02:08:13,863 INFO L78 Accepts]: Start accepts. Automaton has 537 states and 860 transitions. Word has length 141 [2021-11-23 02:08:13,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:13,863 INFO L470 AbstractCegarLoop]: Abstraction has 537 states and 860 transitions. [2021-11-23 02:08:13,863 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) [2021-11-23 02:08:13,864 INFO L276 IsEmpty]: Start isEmpty. Operand 537 states and 860 transitions. [2021-11-23 02:08:13,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-23 02:08:13,865 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:13,865 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:13,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2021-11-23 02:08:13,866 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:13,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:13,866 INFO L85 PathProgramCache]: Analyzing trace with hash -926754897, now seen corresponding path program 1 times [2021-11-23 02:08:13,866 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:08:13,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [151091665] [2021-11-23 02:08:13,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:13,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:08:13,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:13,931 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 152 proven. 0 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-23 02:08:13,931 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:13,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [151091665] [2021-11-23 02:08:13,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [151091665] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:08:13,931 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:08:13,932 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:08:13,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541049953] [2021-11-23 02:08:13,932 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:08:13,932 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:08:13,933 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:13,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:08:13,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:08:13,933 INFO L87 Difference]: Start difference. First operand 537 states and 860 transitions. Second operand has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:15,945 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:16,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:16,344 INFO L93 Difference]: Finished difference Result 1097 states and 1751 transitions. [2021-11-23 02:08:16,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:08:16,350 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 142 [2021-11-23 02:08:16,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:16,352 INFO L225 Difference]: With dead ends: 1097 [2021-11-23 02:08:16,352 INFO L226 Difference]: Without dead ends: 572 [2021-11-23 02:08:16,353 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 [2021-11-23 02:08:16,353 INFO L933 BasicCegarLoop]: 176 mSDtfsCounter, 69 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 423 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:16,354 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 423 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 264 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:08:16,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2021-11-23 02:08:16,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 537. [2021-11-23 02:08:16,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 537 states, 536 states have (on average 1.6026119402985075) internal successors, (859), 536 states have internal predecessors, (859), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:16,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537 states to 537 states and 859 transitions. [2021-11-23 02:08:16,377 INFO L78 Accepts]: Start accepts. Automaton has 537 states and 859 transitions. Word has length 142 [2021-11-23 02:08:16,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:16,377 INFO L470 AbstractCegarLoop]: Abstraction has 537 states and 859 transitions. [2021-11-23 02:08:16,378 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:16,378 INFO L276 IsEmpty]: Start isEmpty. Operand 537 states and 859 transitions. [2021-11-23 02:08:16,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-23 02:08:16,379 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:16,379 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:16,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2021-11-23 02:08:16,380 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:16,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:16,380 INFO L85 PathProgramCache]: Analyzing trace with hash 1085009996, now seen corresponding path program 1 times [2021-11-23 02:08:16,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:08:16,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1188917468] [2021-11-23 02:08:16,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:16,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:08:16,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:16,450 INFO L134 CoverageAnalysis]: Checked inductivity of 219 backedges. 157 proven. 0 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-23 02:08:16,451 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:16,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1188917468] [2021-11-23 02:08:16,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1188917468] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:08:16,451 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:08:16,451 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:08:16,451 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738680115] [2021-11-23 02:08:16,452 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:08:16,452 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:08:16,452 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:16,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:08:16,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:08:16,453 INFO L87 Difference]: Start difference. First operand 537 states and 859 transitions. Second operand has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:18,412 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.96s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:20,434 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:22,448 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:22,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:22,724 INFO L93 Difference]: Finished difference Result 1072 states and 1717 transitions. [2021-11-23 02:08:22,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:08:22,724 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 142 [2021-11-23 02:08:22,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:22,727 INFO L225 Difference]: With dead ends: 1072 [2021-11-23 02:08:22,728 INFO L226 Difference]: Without dead ends: 547 [2021-11-23 02:08:22,728 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 [2021-11-23 02:08:22,729 INFO L933 BasicCegarLoop]: 159 mSDtfsCounter, 21 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 7 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 389 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:22,729 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 389 Invalid, 188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 179 Invalid, 2 Unknown, 0 Unchecked, 6.2s Time] [2021-11-23 02:08:22,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 547 states. [2021-11-23 02:08:22,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 547 to 537. [2021-11-23 02:08:22,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 537 states, 536 states have (on average 1.6007462686567164) internal successors, (858), 536 states have internal predecessors, (858), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:22,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537 states to 537 states and 858 transitions. [2021-11-23 02:08:22,758 INFO L78 Accepts]: Start accepts. Automaton has 537 states and 858 transitions. Word has length 142 [2021-11-23 02:08:22,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:22,758 INFO L470 AbstractCegarLoop]: Abstraction has 537 states and 858 transitions. [2021-11-23 02:08:22,758 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:22,759 INFO L276 IsEmpty]: Start isEmpty. Operand 537 states and 858 transitions. [2021-11-23 02:08:22,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-23 02:08:22,760 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:22,760 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:22,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2021-11-23 02:08:22,761 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:22,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:22,761 INFO L85 PathProgramCache]: Analyzing trace with hash 688355713, now seen corresponding path program 1 times [2021-11-23 02:08:22,761 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:08:22,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1152100856] [2021-11-23 02:08:22,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:22,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:08:22,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:22,828 INFO L134 CoverageAnalysis]: Checked inductivity of 219 backedges. 157 proven. 0 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-23 02:08:22,828 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:22,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1152100856] [2021-11-23 02:08:22,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1152100856] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:08:22,828 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:08:22,829 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:08:22,829 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575962644] [2021-11-23 02:08:22,829 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:08:22,829 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:08:22,830 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:22,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:08:22,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:08:22,830 INFO L87 Difference]: Start difference. First operand 537 states and 858 transitions. Second operand has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:24,841 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:25,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:25,217 INFO L93 Difference]: Finished difference Result 1095 states and 1745 transitions. [2021-11-23 02:08:25,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:08:25,218 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 143 [2021-11-23 02:08:25,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:25,220 INFO L225 Difference]: With dead ends: 1095 [2021-11-23 02:08:25,220 INFO L226 Difference]: Without dead ends: 570 [2021-11-23 02:08:25,221 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 [2021-11-23 02:08:25,221 INFO L933 BasicCegarLoop]: 175 mSDtfsCounter, 67 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 259 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 421 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 259 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:25,222 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 421 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 259 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:08:25,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 570 states. [2021-11-23 02:08:25,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 570 to 537. [2021-11-23 02:08:25,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 537 states, 536 states have (on average 1.5988805970149254) internal successors, (857), 536 states have internal predecessors, (857), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:25,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537 states to 537 states and 857 transitions. [2021-11-23 02:08:25,246 INFO L78 Accepts]: Start accepts. Automaton has 537 states and 857 transitions. Word has length 143 [2021-11-23 02:08:25,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:25,247 INFO L470 AbstractCegarLoop]: Abstraction has 537 states and 857 transitions. [2021-11-23 02:08:25,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:25,247 INFO L276 IsEmpty]: Start isEmpty. Operand 537 states and 857 transitions. [2021-11-23 02:08:25,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-23 02:08:25,248 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:25,249 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:25,249 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66 [2021-11-23 02:08:25,249 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:25,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:25,250 INFO L85 PathProgramCache]: Analyzing trace with hash 742563324, now seen corresponding path program 1 times [2021-11-23 02:08:25,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:08:25,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882934942] [2021-11-23 02:08:25,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:25,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:08:25,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:25,311 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 148 proven. 0 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-23 02:08:25,311 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:25,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882934942] [2021-11-23 02:08:25,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882934942] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:08:25,311 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:08:25,312 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:08:25,312 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077090062] [2021-11-23 02:08:25,312 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:08:25,312 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:08:25,313 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:25,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:08:25,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:08:25,313 INFO L87 Difference]: Start difference. First operand 537 states and 857 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) [2021-11-23 02:08:27,327 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:27,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:27,634 INFO L93 Difference]: Finished difference Result 1079 states and 1721 transitions. [2021-11-23 02:08:27,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:08:27,635 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 144 [2021-11-23 02:08:27,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:27,636 INFO L225 Difference]: With dead ends: 1079 [2021-11-23 02:08:27,636 INFO L226 Difference]: Without dead ends: 554 [2021-11-23 02:08:27,637 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 [2021-11-23 02:08:27,637 INFO L933 BasicCegarLoop]: 154 mSDtfsCounter, 40 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:27,637 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 379 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 199 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:08:27,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2021-11-23 02:08:27,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 537. [2021-11-23 02:08:27,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 537 states, 536 states have (on average 1.5970149253731343) internal successors, (856), 536 states have internal predecessors, (856), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:27,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537 states to 537 states and 856 transitions. [2021-11-23 02:08:27,655 INFO L78 Accepts]: Start accepts. Automaton has 537 states and 856 transitions. Word has length 144 [2021-11-23 02:08:27,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:27,656 INFO L470 AbstractCegarLoop]: Abstraction has 537 states and 856 transitions. [2021-11-23 02:08:27,656 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) [2021-11-23 02:08:27,656 INFO L276 IsEmpty]: Start isEmpty. Operand 537 states and 856 transitions. [2021-11-23 02:08:27,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-23 02:08:27,657 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:27,658 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 6, 6, 5, 5, 5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:27,658 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2021-11-23 02:08:27,658 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:27,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:27,659 INFO L85 PathProgramCache]: Analyzing trace with hash -781457094, now seen corresponding path program 1 times [2021-11-23 02:08:27,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:08:27,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2004303529] [2021-11-23 02:08:27,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:27,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:08:27,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:27,732 INFO L134 CoverageAnalysis]: Checked inductivity of 236 backedges. 154 proven. 0 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-23 02:08:27,733 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:27,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2004303529] [2021-11-23 02:08:27,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2004303529] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:08:27,733 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:08:27,733 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:08:27,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169684695] [2021-11-23 02:08:27,733 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:08:27,734 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:08:27,734 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:27,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:08:27,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:08:27,734 INFO L87 Difference]: Start difference. First operand 537 states and 856 transitions. Second operand has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:29,742 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:30,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:30,063 INFO L93 Difference]: Finished difference Result 1079 states and 1719 transitions. [2021-11-23 02:08:30,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:08:30,064 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 145 [2021-11-23 02:08:30,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:30,065 INFO L225 Difference]: With dead ends: 1079 [2021-11-23 02:08:30,065 INFO L226 Difference]: Without dead ends: 554 [2021-11-23 02:08:30,066 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 [2021-11-23 02:08:30,066 INFO L933 BasicCegarLoop]: 154 mSDtfsCounter, 38 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:30,066 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 379 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 199 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:08:30,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2021-11-23 02:08:30,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 537. [2021-11-23 02:08:30,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 537 states, 536 states have (on average 1.5951492537313432) internal successors, (855), 536 states have internal predecessors, (855), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:30,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537 states to 537 states and 855 transitions. [2021-11-23 02:08:30,084 INFO L78 Accepts]: Start accepts. Automaton has 537 states and 855 transitions. Word has length 145 [2021-11-23 02:08:30,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:30,084 INFO L470 AbstractCegarLoop]: Abstraction has 537 states and 855 transitions. [2021-11-23 02:08:30,085 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:30,085 INFO L276 IsEmpty]: Start isEmpty. Operand 537 states and 855 transitions. [2021-11-23 02:08:30,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-23 02:08:30,086 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:30,086 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 6, 5, 5, 5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:30,086 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2021-11-23 02:08:30,086 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:30,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:30,086 INFO L85 PathProgramCache]: Analyzing trace with hash 764564183, now seen corresponding path program 1 times [2021-11-23 02:08:30,087 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:08:30,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815010871] [2021-11-23 02:08:30,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:30,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:08:30,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:30,141 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 160 proven. 0 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-23 02:08:30,141 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:30,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815010871] [2021-11-23 02:08:30,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815010871] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:08:30,142 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:08:30,142 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:08:30,142 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100645769] [2021-11-23 02:08:30,142 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:08:30,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:08:30,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:30,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:08:30,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:08:30,144 INFO L87 Difference]: Start difference. First operand 537 states and 855 transitions. Second operand has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:32,154 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:32,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:32,507 INFO L93 Difference]: Finished difference Result 1079 states and 1717 transitions. [2021-11-23 02:08:32,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:08:32,508 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 146 [2021-11-23 02:08:32,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:32,509 INFO L225 Difference]: With dead ends: 1079 [2021-11-23 02:08:32,509 INFO L226 Difference]: Without dead ends: 554 [2021-11-23 02:08:32,510 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 [2021-11-23 02:08:32,510 INFO L933 BasicCegarLoop]: 154 mSDtfsCounter, 36 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:32,510 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 379 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 199 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:08:32,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2021-11-23 02:08:32,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 537. [2021-11-23 02:08:32,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 537 states, 536 states have (on average 1.5932835820895523) internal successors, (854), 536 states have internal predecessors, (854), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:32,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537 states to 537 states and 854 transitions. [2021-11-23 02:08:32,528 INFO L78 Accepts]: Start accepts. Automaton has 537 states and 854 transitions. Word has length 146 [2021-11-23 02:08:32,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:32,528 INFO L470 AbstractCegarLoop]: Abstraction has 537 states and 854 transitions. [2021-11-23 02:08:32,529 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:32,529 INFO L276 IsEmpty]: Start isEmpty. Operand 537 states and 854 transitions. [2021-11-23 02:08:32,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-23 02:08:32,530 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:32,530 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 5, 5, 5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:32,530 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2021-11-23 02:08:32,530 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:32,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:32,530 INFO L85 PathProgramCache]: Analyzing trace with hash -1302369803, now seen corresponding path program 1 times [2021-11-23 02:08:32,530 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:08:32,530 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651286325] [2021-11-23 02:08:32,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:32,531 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:08:32,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:32,591 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 166 proven. 0 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-23 02:08:32,591 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:32,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651286325] [2021-11-23 02:08:32,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1651286325] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:08:32,592 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:08:32,592 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:08:32,592 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113574568] [2021-11-23 02:08:32,592 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:08:32,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:08:32,593 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:32,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:08:32,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:08:32,593 INFO L87 Difference]: Start difference. First operand 537 states and 854 transitions. Second operand has 4 states, 4 states have (on average 22.25) internal successors, (89), 4 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:34,605 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:34,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:34,888 INFO L93 Difference]: Finished difference Result 1071 states and 1706 transitions. [2021-11-23 02:08:34,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:08:34,889 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.25) internal successors, (89), 4 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 147 [2021-11-23 02:08:34,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:34,890 INFO L225 Difference]: With dead ends: 1071 [2021-11-23 02:08:34,890 INFO L226 Difference]: Without dead ends: 546 [2021-11-23 02:08:34,890 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 [2021-11-23 02:08:34,891 INFO L933 BasicCegarLoop]: 158 mSDtfsCounter, 30 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 387 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:34,891 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 387 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 191 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:08:34,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2021-11-23 02:08:34,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 537. [2021-11-23 02:08:34,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 537 states, 536 states have (on average 1.5914179104477613) internal successors, (853), 536 states have internal predecessors, (853), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:34,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537 states to 537 states and 853 transitions. [2021-11-23 02:08:34,910 INFO L78 Accepts]: Start accepts. Automaton has 537 states and 853 transitions. Word has length 147 [2021-11-23 02:08:34,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:34,910 INFO L470 AbstractCegarLoop]: Abstraction has 537 states and 853 transitions. [2021-11-23 02:08:34,910 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.25) internal successors, (89), 4 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:34,910 INFO L276 IsEmpty]: Start isEmpty. Operand 537 states and 853 transitions. [2021-11-23 02:08:34,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-23 02:08:34,912 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:34,912 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:34,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2021-11-23 02:08:34,913 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:34,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:34,913 INFO L85 PathProgramCache]: Analyzing trace with hash 352186324, now seen corresponding path program 1 times [2021-11-23 02:08:34,913 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:08:34,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657842073] [2021-11-23 02:08:34,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:34,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:08:34,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:34,992 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 172 proven. 0 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-23 02:08:34,992 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:34,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657842073] [2021-11-23 02:08:34,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657842073] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:08:34,993 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:08:34,993 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:08:34,993 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9047068] [2021-11-23 02:08:34,993 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:08:34,994 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:08:34,994 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:34,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:08:34,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:08:34,995 INFO L87 Difference]: Start difference. First operand 537 states and 853 transitions. Second operand has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:37,006 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:37,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:37,327 INFO L93 Difference]: Finished difference Result 1078 states and 1712 transitions. [2021-11-23 02:08:37,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:08:37,328 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 147 [2021-11-23 02:08:37,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:37,329 INFO L225 Difference]: With dead ends: 1078 [2021-11-23 02:08:37,329 INFO L226 Difference]: Without dead ends: 553 [2021-11-23 02:08:37,330 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 [2021-11-23 02:08:37,330 INFO L933 BasicCegarLoop]: 161 mSDtfsCounter, 36 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 393 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:37,330 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 393 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 238 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:08:37,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 553 states. [2021-11-23 02:08:37,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 553 to 537. [2021-11-23 02:08:37,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 537 states, 536 states have (on average 1.5895522388059702) internal successors, (852), 536 states have internal predecessors, (852), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:37,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537 states to 537 states and 852 transitions. [2021-11-23 02:08:37,349 INFO L78 Accepts]: Start accepts. Automaton has 537 states and 852 transitions. Word has length 147 [2021-11-23 02:08:37,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:37,349 INFO L470 AbstractCegarLoop]: Abstraction has 537 states and 852 transitions. [2021-11-23 02:08:37,349 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:37,349 INFO L276 IsEmpty]: Start isEmpty. Operand 537 states and 852 transitions. [2021-11-23 02:08:37,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-23 02:08:37,350 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:37,350 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:37,350 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2021-11-23 02:08:37,350 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:37,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:37,351 INFO L85 PathProgramCache]: Analyzing trace with hash -779894763, now seen corresponding path program 1 times [2021-11-23 02:08:37,351 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:08:37,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941103979] [2021-11-23 02:08:37,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:37,351 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:08:37,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:37,413 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 152 proven. 0 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-23 02:08:37,413 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:37,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941103979] [2021-11-23 02:08:37,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941103979] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:08:37,414 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:08:37,414 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:08:37,414 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571247371] [2021-11-23 02:08:37,414 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:08:37,415 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:08:37,415 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:37,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:08:37,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:08:37,415 INFO L87 Difference]: Start difference. First operand 537 states and 852 transitions. Second operand has 4 states, 4 states have (on average 22.5) internal successors, (90), 4 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:39,426 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:39,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:39,770 INFO L93 Difference]: Finished difference Result 1087 states and 1724 transitions. [2021-11-23 02:08:39,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:08:39,771 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.5) internal successors, (90), 4 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 148 [2021-11-23 02:08:39,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:39,772 INFO L225 Difference]: With dead ends: 1087 [2021-11-23 02:08:39,772 INFO L226 Difference]: Without dead ends: 562 [2021-11-23 02:08:39,773 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 [2021-11-23 02:08:39,773 INFO L933 BasicCegarLoop]: 147 mSDtfsCounter, 53 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 365 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:39,773 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 365 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 220 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:08:39,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 562 states. [2021-11-23 02:08:39,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 562 to 537. [2021-11-23 02:08:39,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 537 states, 536 states have (on average 1.587686567164179) internal successors, (851), 536 states have internal predecessors, (851), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:39,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537 states to 537 states and 851 transitions. [2021-11-23 02:08:39,798 INFO L78 Accepts]: Start accepts. Automaton has 537 states and 851 transitions. Word has length 148 [2021-11-23 02:08:39,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:39,798 INFO L470 AbstractCegarLoop]: Abstraction has 537 states and 851 transitions. [2021-11-23 02:08:39,798 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.5) internal successors, (90), 4 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:39,798 INFO L276 IsEmpty]: Start isEmpty. Operand 537 states and 851 transitions. [2021-11-23 02:08:39,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-23 02:08:39,800 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:39,800 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:39,800 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72 [2021-11-23 02:08:39,800 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:39,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:39,801 INFO L85 PathProgramCache]: Analyzing trace with hash -2143140451, now seen corresponding path program 1 times [2021-11-23 02:08:39,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:08:39,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2092300023] [2021-11-23 02:08:39,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:39,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:08:39,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:39,866 INFO L134 CoverageAnalysis]: Checked inductivity of 236 backedges. 174 proven. 0 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-23 02:08:39,866 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:39,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2092300023] [2021-11-23 02:08:39,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2092300023] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:08:39,867 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:08:39,867 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:08:39,867 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762129813] [2021-11-23 02:08:39,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:08:39,868 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:08:39,868 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:39,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:08:39,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:08:39,869 INFO L87 Difference]: Start difference. First operand 537 states and 851 transitions. Second operand has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:41,879 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:42,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:42,206 INFO L93 Difference]: Finished difference Result 1076 states and 1706 transitions. [2021-11-23 02:08:42,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:08:42,207 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 148 [2021-11-23 02:08:42,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:42,208 INFO L225 Difference]: With dead ends: 1076 [2021-11-23 02:08:42,208 INFO L226 Difference]: Without dead ends: 551 [2021-11-23 02:08:42,209 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 [2021-11-23 02:08:42,209 INFO L933 BasicCegarLoop]: 162 mSDtfsCounter, 33 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 395 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:42,209 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 395 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 236 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:08:42,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2021-11-23 02:08:42,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 537. [2021-11-23 02:08:42,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 537 states, 536 states have (on average 1.585820895522388) internal successors, (850), 536 states have internal predecessors, (850), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:42,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537 states to 537 states and 850 transitions. [2021-11-23 02:08:42,228 INFO L78 Accepts]: Start accepts. Automaton has 537 states and 850 transitions. Word has length 148 [2021-11-23 02:08:42,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:42,228 INFO L470 AbstractCegarLoop]: Abstraction has 537 states and 850 transitions. [2021-11-23 02:08:42,228 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:42,228 INFO L276 IsEmpty]: Start isEmpty. Operand 537 states and 850 transitions. [2021-11-23 02:08:42,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-23 02:08:42,229 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:42,230 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 6, 6, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:42,230 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2021-11-23 02:08:42,230 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:42,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:42,230 INFO L85 PathProgramCache]: Analyzing trace with hash -733017535, now seen corresponding path program 1 times [2021-11-23 02:08:42,230 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:08:42,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786555531] [2021-11-23 02:08:42,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:42,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:08:42,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:42,324 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 158 proven. 0 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-23 02:08:42,324 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:42,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1786555531] [2021-11-23 02:08:42,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1786555531] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:08:42,324 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:08:42,325 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:08:42,325 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207941054] [2021-11-23 02:08:42,325 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:08:42,327 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:08:42,327 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:42,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:08:42,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:08:42,328 INFO L87 Difference]: Start difference. First operand 537 states and 850 transitions. Second operand has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:44,338 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:44,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:44,682 INFO L93 Difference]: Finished difference Result 1087 states and 1720 transitions. [2021-11-23 02:08:44,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:08:44,682 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 149 [2021-11-23 02:08:44,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:44,683 INFO L225 Difference]: With dead ends: 1087 [2021-11-23 02:08:44,683 INFO L226 Difference]: Without dead ends: 562 [2021-11-23 02:08:44,684 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 [2021-11-23 02:08:44,684 INFO L933 BasicCegarLoop]: 147 mSDtfsCounter, 51 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 365 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:44,684 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 365 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 220 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:08:44,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 562 states. [2021-11-23 02:08:44,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 562 to 537. [2021-11-23 02:08:44,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 537 states, 536 states have (on average 1.583955223880597) internal successors, (849), 536 states have internal predecessors, (849), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:44,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537 states to 537 states and 849 transitions. [2021-11-23 02:08:44,709 INFO L78 Accepts]: Start accepts. Automaton has 537 states and 849 transitions. Word has length 149 [2021-11-23 02:08:44,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:44,709 INFO L470 AbstractCegarLoop]: Abstraction has 537 states and 849 transitions. [2021-11-23 02:08:44,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:44,710 INFO L276 IsEmpty]: Start isEmpty. Operand 537 states and 849 transitions. [2021-11-23 02:08:44,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-23 02:08:44,711 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:44,711 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:44,712 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2021-11-23 02:08:44,712 INFO L402 AbstractCegarLoop]: === Iteration 76 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:44,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:44,712 INFO L85 PathProgramCache]: Analyzing trace with hash 336821141, now seen corresponding path program 1 times [2021-11-23 02:08:44,712 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:08:44,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633679630] [2021-11-23 02:08:44,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:44,713 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:08:45,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:45,939 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:08:45,939 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:45,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1633679630] [2021-11-23 02:08:45,939 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1633679630] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:08:45,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188156617] [2021-11-23 02:08:45,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:45,939 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:08:45,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:08:45,945 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:08:45,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:08:46,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:46,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 591 conjuncts, 79 conjunts are in the unsatisfiable core [2021-11-23 02:08:46,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:08:46,586 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Some non-self update cases but no top-level DER relation [2021-11-23 02:08:46,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [263373747] [2021-11-23 02:08:46,610 INFO L159 IcfgInterpreter]: Started Sifa with 56 locations of interest [2021-11-23 02:08:46,610 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:08:46,615 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:08:46,621 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:08:46,622 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:08:47,055 FATAL L? ?]: Ignoring exception! java.lang.IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.smtlibutils.IncrementalPlicationChecker@3bbfd57b at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.IncrementalPlicationChecker.assertLhs(IncrementalPlicationChecker.java:103) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.IncrementalPlicationChecker.checkPlication(IncrementalPlicationChecker.java:135) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.arrays.ArrayIndexEqualityManager.(ArrayIndexEqualityManager.java:92) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.ElimStorePlain.applyComplexEliminationRules(ElimStorePlain.java:337) 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$ApplicationTermTask.doStep(TermContextTransformationEngine.java:169) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.TermContextTransformationEngine.transform(TermContextTransformationEngine.java:77) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.TermContextTransformationEngine.transform(TermContextTransformationEngine.java:61) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.QuantifierPushTermWalker.eliminate(QuantifierPushTermWalker.java:243) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.QuantifierPushTermWalker.eliminate(QuantifierPushTermWalker.java:233) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools$EliminatingTermDomainOperationProvider.newQuantifier(SymbolicTools.java:285) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools$EliminatingTermDomainOperationProvider.projectExistentially(SymbolicTools.java:267) 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:119) 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) [2021-11-23 02:08:47,059 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:08:47,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-11-23 02:08:47,059 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249374261] [2021-11-23 02:08:47,059 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 02:08:47,060 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 02:08:47,060 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:47,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 02:08:47,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:08:47,061 INFO L87 Difference]: Start difference. First operand 537 states and 849 transitions. Second operand has 13 states, 13 states have (on average 11.461538461538462) internal successors, (149), 12 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) [2021-11-23 02:08:47,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 02:08:47,061 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:08:47,062 INFO L933 BasicCegarLoop]: 0 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 1 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:47,062 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 0 Invalid, 1 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:08:47,100 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:08:47,284 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:08:47,285 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.smtlibutils.IncrementalPlicationChecker@3bbfd57b at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.assertCodeBlock(IncrementalHoareTripleChecker.java:360) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.prepareAssertionStackAndAddTransition(IncrementalHoareTripleChecker.java:206) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.checkInternal(IncrementalHoareTripleChecker.java:131) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ChainingHoareTripleChecker$ProtectedHtc.checkInternal(ChainingHoareTripleChecker.java:455) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ChainingHoareTripleChecker.checkInternal(ChainingHoareTripleChecker.java:103) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.CachingHoareTripleChecker.checkInternal(CachingHoareTripleChecker.java:95) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton$InternalSuccessorComputationHelper.computeSuccWithSolver(AbstractInterpolantAutomaton.java:357) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.chooseFalseSuccessor2(BasicAbstractInterpolantAutomaton.java:107) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:73) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:233) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.TotalizeNwa.internalSuccessors(TotalizeNwa.java:213) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ComplementDeterministicNwa.internalSuccessors(ComplementDeterministicNwa.java:121) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:216) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:208) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.addInternalsAndSuccessors(NestedWordAutomatonReachableStates.java:1058) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.(NestedWordAutomatonReachableStates.java:960) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates.(NestedWordAutomatonReachableStates.java:182) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.computeDifference(Difference.java:137) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.(Difference.java:90) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.computeAutomataDifference(BasicCegarLoop.java:868) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.refineAbstraction(BasicCegarLoop.java:784) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.refineAbstractionInternal(AbstractCegarLoop.java:462) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:420) 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) [2021-11-23 02:08:47,287 INFO L158 Benchmark]: Toolchain (without parser) took 203032.37ms. Allocated memory was 100.7MB in the beginning and 157.3MB in the end (delta: 56.6MB). Free memory was 62.5MB in the beginning and 109.3MB in the end (delta: -46.8MB). Peak memory consumption was 11.3MB. Max. memory is 16.1GB. [2021-11-23 02:08:47,287 INFO L158 Benchmark]: CDTParser took 0.28ms. Allocated memory is still 100.7MB. Free memory was 81.1MB in the beginning and 81.0MB in the end (delta: 92.4kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 02:08:47,287 INFO L158 Benchmark]: CACSL2BoogieTranslator took 706.12ms. Allocated memory is still 100.7MB. Free memory was 62.3MB in the beginning and 55.0MB in the end (delta: 7.3MB). Peak memory consumption was 12.7MB. Max. memory is 16.1GB. [2021-11-23 02:08:47,287 INFO L158 Benchmark]: Boogie Procedure Inliner took 97.90ms. Allocated memory is still 100.7MB. Free memory was 55.0MB in the beginning and 50.0MB in the end (delta: 5.0MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-11-23 02:08:47,287 INFO L158 Benchmark]: Boogie Preprocessor took 134.79ms. Allocated memory is still 100.7MB. Free memory was 50.0MB in the beginning and 42.9MB in the end (delta: 7.1MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-11-23 02:08:47,287 INFO L158 Benchmark]: RCFGBuilder took 3722.26ms. Allocated memory was 100.7MB in the beginning and 125.8MB in the end (delta: 25.2MB). Free memory was 42.9MB in the beginning and 59.4MB in the end (delta: -16.5MB). Peak memory consumption was 34.0MB. Max. memory is 16.1GB. [2021-11-23 02:08:47,287 INFO L158 Benchmark]: TraceAbstraction took 198359.33ms. Allocated memory was 125.8MB in the beginning and 157.3MB in the end (delta: 31.5MB). Free memory was 59.4MB in the beginning and 109.3MB in the end (delta: -49.9MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 02:08:47,288 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28ms. Allocated memory is still 100.7MB. Free memory was 81.1MB in the beginning and 81.0MB in the end (delta: 92.4kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 706.12ms. Allocated memory is still 100.7MB. Free memory was 62.3MB in the beginning and 55.0MB in the end (delta: 7.3MB). Peak memory consumption was 12.7MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 97.90ms. Allocated memory is still 100.7MB. Free memory was 55.0MB in the beginning and 50.0MB in the end (delta: 5.0MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Boogie Preprocessor took 134.79ms. Allocated memory is still 100.7MB. Free memory was 50.0MB in the beginning and 42.9MB in the end (delta: 7.1MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * RCFGBuilder took 3722.26ms. Allocated memory was 100.7MB in the beginning and 125.8MB in the end (delta: 25.2MB). Free memory was 42.9MB in the beginning and 59.4MB in the end (delta: -16.5MB). Peak memory consumption was 34.0MB. Max. memory is 16.1GB. * TraceAbstraction took 198359.33ms. Allocated memory was 125.8MB in the beginning and 157.3MB in the end (delta: 31.5MB). Free memory was 59.4MB in the beginning and 109.3MB in the end (delta: -49.9MB). There was no memory consumed. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.smtlibutils.IncrementalPlicationChecker@3bbfd57b de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.smtlibutils.IncrementalPlicationChecker@3bbfd57b: de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 02:08:47,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/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_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/openssl/s3_srvr.blast.06.i.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V --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 1fcf2e3f406244358dbdc63025b5201d61a26c4305d0f5c4a6ff65bb76c78282 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:08:49,756 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:08:49,758 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:08:49,814 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:08:49,815 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:08:49,821 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:08:49,823 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:08:49,827 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:08:49,831 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:08:49,841 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:08:49,843 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:08:49,845 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:08:49,845 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:08:49,848 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:08:49,850 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:08:49,856 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:08:49,858 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:08:49,859 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:08:49,861 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:08:49,868 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:08:49,871 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:08:49,872 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:08:49,876 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:08:49,878 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:08:49,884 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:08:49,885 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:08:49,885 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:08:49,887 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:08:49,888 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:08:49,889 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:08:49,890 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:08:49,891 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:08:49,893 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:08:49,894 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:08:49,895 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:08:49,896 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:08:49,897 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:08:49,898 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:08:49,898 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:08:49,900 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:08:49,901 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:08:49,902 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 02:08:49,954 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:08:49,954 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:08:49,955 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:08:49,955 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:08:49,956 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:08:49,957 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:08:49,957 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:08:49,957 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:08:49,957 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:08:49,958 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:08:49,959 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:08:49,959 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:08:49,961 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:08:49,961 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:08:49,961 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:08:49,962 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:08:49,962 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:08:49,962 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:08:49,962 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:08:49,962 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 02:08:49,963 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 02:08:49,963 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 02:08:49,963 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:08:49,963 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:08:49,964 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:08:49,964 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:08:49,964 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:08:49,964 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 02:08:49,965 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:08:49,965 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:08:49,965 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:08:49,965 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:08:49,966 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:08:49,966 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 02:08:49,966 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 02:08:49,967 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:08:49,967 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:08:49,967 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:08:49,967 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_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1fcf2e3f406244358dbdc63025b5201d61a26c4305d0f5c4a6ff65bb76c78282 [2021-11-23 02:08:50,407 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:08:50,428 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:08:50,431 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:08:50,432 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:08:50,433 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:08:50,434 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/openssl/s3_srvr.blast.06.i.cil-1.c [2021-11-23 02:08:50,505 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/data/04370e9d8/2a48c46be46742d29fc40e0fd90647d1/FLAG91b0b03f3 [2021-11-23 02:08:51,278 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:08:51,279 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/sv-benchmarks/c/openssl/s3_srvr.blast.06.i.cil-1.c [2021-11-23 02:08:51,311 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/data/04370e9d8/2a48c46be46742d29fc40e0fd90647d1/FLAG91b0b03f3 [2021-11-23 02:08:51,406 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/data/04370e9d8/2a48c46be46742d29fc40e0fd90647d1 [2021-11-23 02:08:51,408 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:08:51,410 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:08:51,411 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:08:51,411 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:08:51,416 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:08:51,417 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:08:51" (1/1) ... [2021-11-23 02:08:51,419 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1df0cf80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:51, skipping insertion in model container [2021-11-23 02:08:51,420 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:08:51" (1/1) ... [2021-11-23 02:08:51,427 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:08:51,509 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:08:51,997 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_89925ffd-3ae9-45f7-be0f-188db40ba8c8/sv-benchmarks/c/openssl/s3_srvr.blast.06.i.cil-1.c[78520,78533] [2021-11-23 02:08:52,018 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:08:52,036 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-23 02:08:52,050 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:08:52,169 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_89925ffd-3ae9-45f7-be0f-188db40ba8c8/sv-benchmarks/c/openssl/s3_srvr.blast.06.i.cil-1.c[78520,78533] [2021-11-23 02:08:52,172 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:08:52,179 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:08:52,348 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_89925ffd-3ae9-45f7-be0f-188db40ba8c8/sv-benchmarks/c/openssl/s3_srvr.blast.06.i.cil-1.c[78520,78533] [2021-11-23 02:08:52,350 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:08:52,381 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:08:52,382 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:52 WrapperNode [2021-11-23 02:08:52,382 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:08:52,383 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:08:52,384 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:08:52,384 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:08:52,391 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:52" (1/1) ... [2021-11-23 02:08:52,433 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:52" (1/1) ... [2021-11-23 02:08:52,506 INFO L137 Inliner]: procedures = 35, calls = 223, calls flagged for inlining = 7, calls inlined = 3, statements flattened = 785 [2021-11-23 02:08:52,507 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:08:52,508 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:08:52,508 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:08:52,508 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:08:52,517 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:52" (1/1) ... [2021-11-23 02:08:52,518 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:52" (1/1) ... [2021-11-23 02:08:52,537 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:52" (1/1) ... [2021-11-23 02:08:52,543 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:52" (1/1) ... [2021-11-23 02:08:52,604 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:52" (1/1) ... [2021-11-23 02:08:52,629 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:52" (1/1) ... [2021-11-23 02:08:52,633 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:52" (1/1) ... [2021-11-23 02:08:52,646 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:08:52,651 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:08:52,651 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:08:52,651 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:08:52,652 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:52" (1/1) ... [2021-11-23 02:08:52,659 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:08:52,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:08:52,682 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:08:52,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:08:52,729 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:08:52,730 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 02:08:52,730 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 02:08:52,730 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-23 02:08:52,730 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 02:08:52,730 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 02:08:52,731 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:08:52,731 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:08:52,731 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-23 02:08:52,912 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:08:52,914 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:08:52,949 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 02:09:03,791 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##90: assume false; [2021-11-23 02:09:03,791 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##91: assume !false; [2021-11-23 02:09:03,791 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:09:03,803 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:09:03,803 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 02:09:03,806 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:09:03 BoogieIcfgContainer [2021-11-23 02:09:03,807 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:09:03,808 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:09:03,809 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:09:03,811 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:09:03,812 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:08:51" (1/3) ... [2021-11-23 02:09:03,813 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d729ef7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:09:03, skipping insertion in model container [2021-11-23 02:09:03,813 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:52" (2/3) ... [2021-11-23 02:09:03,813 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d729ef7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:09:03, skipping insertion in model container [2021-11-23 02:09:03,814 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:09:03" (3/3) ... [2021-11-23 02:09:03,815 INFO L111 eAbstractionObserver]: Analyzing ICFG s3_srvr.blast.06.i.cil-1.c [2021-11-23 02:09:03,821 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:09:03,821 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:09:03,891 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:09:03,909 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 [2021-11-23 02:09:03,910 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:09:03,933 INFO L276 IsEmpty]: Start isEmpty. Operand has 161 states, 159 states have (on average 1.7358490566037736) internal successors, (276), 160 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:03,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 02:09:03,950 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:03,950 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:03,951 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:03,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:03,959 INFO L85 PathProgramCache]: Analyzing trace with hash -2069453275, now seen corresponding path program 1 times [2021-11-23 02:09:03,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:09:03,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1130850793] [2021-11-23 02:09:03,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:03,977 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:09:03,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:09:03,984 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:09:03,988 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 02:09:04,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:04,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 02:09:04,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:04,498 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 [2021-11-23 02:09:04,510 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 [2021-11-23 02:09:04,628 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 0 case distinctions, treesize of input 336 treesize of output 319 [2021-11-23 02:09:05,187 INFO L354 Elim1Store]: treesize reduction 1607, result has 2.8 percent of original size [2021-11-23 02:09:05,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 8 case distinctions, treesize of input 1289 treesize of output 1241 [2021-11-23 02:09:05,385 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 0 case distinctions, treesize of input 336 treesize of output 319 [2021-11-23 02:09:05,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,406 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,530 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 36 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 97 treesize of output 49 [2021-11-23 02:09:05,706 INFO L354 Elim1Store]: treesize reduction 340, result has 2.6 percent of original size [2021-11-23 02:09:05,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 4 case distinctions, treesize of input 62 treesize of output 13 [2021-11-23 02:09:05,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:05,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 10 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 13 [2021-11-23 02:09:05,792 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 [2021-11-23 02:09:05,797 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 [2021-11-23 02:09:05,937 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:09:05,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:06,977 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:09:06,978 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:09:06,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1130850793] [2021-11-23 02:09:06,978 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1130850793] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:06,979 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:09:06,979 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2021-11-23 02:09:06,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283490662] [2021-11-23 02:09:06,981 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:06,986 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:09:06,986 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:09:07,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:09:07,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:09:07,018 INFO L87 Difference]: Start difference. First operand has 161 states, 159 states have (on average 1.7358490566037736) internal successors, (276), 160 states have internal predecessors, (276), 0 states have call successors, (0), 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 8 states, 8 states have (on average 6.625) internal successors, (53), 8 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:09,053 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:09:11,070 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:09:14,585 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:09:21,086 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.15s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:09:23,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:23,005 INFO L93 Difference]: Finished difference Result 323 states and 551 transitions. [2021-11-23 02:09:23,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:09:23,016 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 6.625) internal successors, (53), 8 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-23 02:09:23,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:23,027 INFO L225 Difference]: With dead ends: 323 [2021-11-23 02:09:23,027 INFO L226 Difference]: Without dead ends: 148 [2021-11-23 02:09:23,031 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:09:23,033 INFO L933 BasicCegarLoop]: 268 mSDtfsCounter, 8 mSDsluCounter, 814 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 1 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 1082 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 65 IncrementalHoareTripleChecker+Unchecked, 15.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:23,034 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 1082 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 218 Invalid, 3 Unknown, 65 Unchecked, 15.9s Time] [2021-11-23 02:09:23,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-23 02:09:23,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2021-11-23 02:09:23,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 147 states have (on average 1.5714285714285714) internal successors, (231), 147 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:23,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 231 transitions. [2021-11-23 02:09:23,099 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 231 transitions. Word has length 46 [2021-11-23 02:09:23,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:23,100 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 231 transitions. [2021-11-23 02:09:23,100 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 6.625) internal successors, (53), 8 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:23,101 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 231 transitions. [2021-11-23 02:09:23,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 02:09:23,108 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:23,108 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:23,129 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:23,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:09:23,329 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:23,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:23,330 INFO L85 PathProgramCache]: Analyzing trace with hash 176126179, now seen corresponding path program 1 times [2021-11-23 02:09:23,331 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:09:23,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1466014338] [2021-11-23 02:09:23,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:23,335 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:09:23,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:09:23,336 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:09:23,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 02:09:23,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:23,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:09:23,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:23,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:23,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:23,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:23,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:23,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:23,809 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:09:24,189 INFO L354 Elim1Store]: treesize reduction 1130, result has 5.7 percent of original size [2021-11-23 02:09:24,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 7 case distinctions, treesize of input 80 treesize of output 78 [2021-11-23 02:09:27,480 INFO L354 Elim1Store]: treesize reduction 2459, result has 4.9 percent of original size [2021-11-23 02:09:27,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 80 case distinctions, treesize of input 238 treesize of output 174 [2021-11-23 02:09:35,267 INFO L354 Elim1Store]: treesize reduction 792, result has 0.1 percent of original size [2021-11-23 02:09:35,267 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 183 treesize of output 87 [2021-11-23 02:09:35,365 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:09:35,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:43,628 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:09:43,629 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:09:43,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1466014338] [2021-11-23 02:09:43,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1466014338] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:43,629 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:09:43,629 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 6 [2021-11-23 02:09:43,629 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645417368] [2021-11-23 02:09:43,630 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:43,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:09:43,631 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:09:43,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:09:43,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=15, Unknown=3, NotChecked=0, Total=30 [2021-11-23 02:09:43,632 INFO L87 Difference]: Start difference. First operand 148 states and 231 transitions. Second operand has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 6 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:45,662 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:09:50,699 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.27s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:09:51,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:51,252 INFO L93 Difference]: Finished difference Result 301 states and 473 transitions. [2021-11-23 02:09:51,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:09:51,256 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 6 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-23 02:09:51,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:51,258 INFO L225 Difference]: With dead ends: 301 [2021-11-23 02:09:51,258 INFO L226 Difference]: Without dead ends: 163 [2021-11-23 02:09:51,259 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=12, Invalid=15, Unknown=3, NotChecked=0, Total=30 [2021-11-23 02:09:51,260 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 38 mSDsluCounter, 337 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 552 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 7.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:51,260 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 552 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 88 Invalid, 1 Unknown, 18 Unchecked, 7.6s Time] [2021-11-23 02:09:51,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-11-23 02:09:51,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 159. [2021-11-23 02:09:51,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 158 states have (on average 1.5822784810126582) internal successors, (250), 158 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:51,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 250 transitions. [2021-11-23 02:09:51,274 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 250 transitions. Word has length 46 [2021-11-23 02:09:51,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:51,274 INFO L470 AbstractCegarLoop]: Abstraction has 159 states and 250 transitions. [2021-11-23 02:09:51,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 6 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:51,274 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 250 transitions. [2021-11-23 02:09:51,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-23 02:09:51,276 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:51,277 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:51,290 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-11-23 02:09:51,482 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:09:51,482 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:51,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:51,483 INFO L85 PathProgramCache]: Analyzing trace with hash 755663040, now seen corresponding path program 1 times [2021-11-23 02:09:51,483 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:09:51,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1345327104] [2021-11-23 02:09:51,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:51,484 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:09:51,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:09:51,485 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:09:51,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 02:09:51,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:51,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:09:51,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:51,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:51,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:51,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:51,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:51,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:09:51,952 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:09:52,299 INFO L354 Elim1Store]: treesize reduction 1130, result has 5.7 percent of original size [2021-11-23 02:09:52,299 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 7 case distinctions, treesize of input 80 treesize of output 78 [2021-11-23 02:09:55,483 INFO L354 Elim1Store]: treesize reduction 2459, result has 4.9 percent of original size [2021-11-23 02:09:55,484 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 80 case distinctions, treesize of input 238 treesize of output 174 [2021-11-23 02:10:02,712 INFO L354 Elim1Store]: treesize reduction 792, result has 0.1 percent of original size [2021-11-23 02:10:02,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 183 treesize of output 87 [2021-11-23 02:10:02,860 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:02,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:03,185 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:03,186 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:10:03,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1345327104] [2021-11-23 02:10:03,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1345327104] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:10:03,186 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:10:03,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-23 02:10:03,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372987075] [2021-11-23 02:10:03,187 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:10:03,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:10:03,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:10:03,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:10:03,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=26, Unknown=1, NotChecked=0, Total=42 [2021-11-23 02:10:03,188 INFO L87 Difference]: Start difference. First operand 159 states and 250 transitions. Second operand has 7 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:04,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:04,176 INFO L93 Difference]: Finished difference Result 299 states and 470 transitions. [2021-11-23 02:10:04,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:10:04,176 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-23 02:10:04,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:04,178 INFO L225 Difference]: With dead ends: 299 [2021-11-23 02:10:04,178 INFO L226 Difference]: Without dead ends: 161 [2021-11-23 02:10:04,179 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 110 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=15, Invalid=26, Unknown=1, NotChecked=0, Total=42 [2021-11-23 02:10:04,180 INFO L933 BasicCegarLoop]: 220 mSDtfsCounter, 20 mSDsluCounter, 686 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 906 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 103 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:04,181 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 906 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 103 Unchecked, 1.0s Time] [2021-11-23 02:10:04,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-11-23 02:10:04,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 159. [2021-11-23 02:10:04,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 158 states have (on average 1.5759493670886076) internal successors, (249), 158 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:04,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 249 transitions. [2021-11-23 02:10:04,194 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 249 transitions. Word has length 59 [2021-11-23 02:10:04,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:04,195 INFO L470 AbstractCegarLoop]: Abstraction has 159 states and 249 transitions. [2021-11-23 02:10:04,195 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:04,195 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 249 transitions. [2021-11-23 02:10:04,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 02:10:04,197 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:04,198 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:04,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:04,419 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:10:04,420 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:04,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:04,421 INFO L85 PathProgramCache]: Analyzing trace with hash 1854767371, now seen corresponding path program 1 times [2021-11-23 02:10:04,421 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:10:04,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1661860423] [2021-11-23 02:10:04,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:04,422 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:10:04,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:10:04,422 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:10:04,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 02:10:04,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:04,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:10:04,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:04,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:04,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:04,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:04,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:04,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:04,891 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:10:05,275 INFO L354 Elim1Store]: treesize reduction 1130, result has 5.7 percent of original size [2021-11-23 02:10:05,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 7 case distinctions, treesize of input 80 treesize of output 78 [2021-11-23 02:10:08,488 INFO L354 Elim1Store]: treesize reduction 2459, result has 4.9 percent of original size [2021-11-23 02:10:08,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 80 case distinctions, treesize of input 238 treesize of output 174 [2021-11-23 02:10:15,045 INFO L354 Elim1Store]: treesize reduction 792, result has 0.1 percent of original size [2021-11-23 02:10:15,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 183 treesize of output 87 [2021-11-23 02:10:15,180 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:15,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:15,423 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:15,423 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:10:15,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1661860423] [2021-11-23 02:10:15,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1661860423] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:10:15,423 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:10:15,424 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-23 02:10:15,424 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939157343] [2021-11-23 02:10:15,424 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:10:15,424 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:10:15,424 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:10:15,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:10:15,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=26, Unknown=1, NotChecked=0, Total=42 [2021-11-23 02:10:15,425 INFO L87 Difference]: Start difference. First operand 159 states and 249 transitions. Second operand has 7 states, 7 states have (on average 9.857142857142858) internal successors, (69), 7 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:17,443 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:10:20,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:20,618 INFO L93 Difference]: Finished difference Result 308 states and 484 transitions. [2021-11-23 02:10:20,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:10:20,620 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 9.857142857142858) internal successors, (69), 7 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-23 02:10:20,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:20,621 INFO L225 Difference]: With dead ends: 308 [2021-11-23 02:10:20,622 INFO L226 Difference]: Without dead ends: 170 [2021-11-23 02:10:20,622 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=15, Invalid=26, Unknown=1, NotChecked=0, Total=42 [2021-11-23 02:10:20,623 INFO L933 BasicCegarLoop]: 217 mSDtfsCounter, 27 mSDsluCounter, 565 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 28 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 782 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:20,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 782 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 101 Invalid, 1 Unknown, 37 Unchecked, 5.2s Time] [2021-11-23 02:10:20,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-23 02:10:20,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 170. [2021-11-23 02:10:20,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 169 states have (on average 1.5621301775147929) internal successors, (264), 169 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:20,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 264 transitions. [2021-11-23 02:10:20,637 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 264 transitions. Word has length 60 [2021-11-23 02:10:20,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:20,637 INFO L470 AbstractCegarLoop]: Abstraction has 170 states and 264 transitions. [2021-11-23 02:10:20,637 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 9.857142857142858) internal successors, (69), 7 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:20,638 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 264 transitions. [2021-11-23 02:10:20,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 02:10:20,639 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:20,639 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:20,652 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (5)] Ended with exit code 0 [2021-11-23 02:10:20,849 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:10:20,849 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:20,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:20,850 INFO L85 PathProgramCache]: Analyzing trace with hash 219231991, now seen corresponding path program 1 times [2021-11-23 02:10:20,851 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:10:20,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [867132944] [2021-11-23 02:10:20,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:20,851 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:10:20,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:10:20,852 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:10:20,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 02:10:21,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:21,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:10:21,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:21,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:21,322 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:21,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:21,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:21,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:21,327 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:10:21,685 INFO L354 Elim1Store]: treesize reduction 1130, result has 5.7 percent of original size [2021-11-23 02:10:21,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 7 case distinctions, treesize of input 80 treesize of output 78 [2021-11-23 02:10:24,927 INFO L354 Elim1Store]: treesize reduction 2459, result has 4.9 percent of original size [2021-11-23 02:10:24,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 80 case distinctions, treesize of input 238 treesize of output 174 [2021-11-23 02:10:31,675 INFO L354 Elim1Store]: treesize reduction 792, result has 0.1 percent of original size [2021-11-23 02:10:31,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 183 treesize of output 87 [2021-11-23 02:10:31,798 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:31,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:32,065 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:32,065 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:10:32,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [867132944] [2021-11-23 02:10:32,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [867132944] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:10:32,065 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:10:32,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-23 02:10:32,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366392536] [2021-11-23 02:10:32,066 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:10:32,066 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:10:32,066 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:10:32,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:10:32,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=26, Unknown=1, NotChecked=0, Total=42 [2021-11-23 02:10:32,067 INFO L87 Difference]: Start difference. First operand 170 states and 264 transitions. Second operand has 7 states, 7 states have (on average 10.0) internal successors, (70), 7 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) [2021-11-23 02:10:34,091 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:10:36,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:36,268 INFO L93 Difference]: Finished difference Result 331 states and 516 transitions. [2021-11-23 02:10:36,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:10:36,270 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.0) internal successors, (70), 7 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 60 [2021-11-23 02:10:36,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:36,271 INFO L225 Difference]: With dead ends: 331 [2021-11-23 02:10:36,272 INFO L226 Difference]: Without dead ends: 182 [2021-11-23 02:10:36,272 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=15, Invalid=26, Unknown=1, NotChecked=0, Total=42 [2021-11-23 02:10:36,273 INFO L933 BasicCegarLoop]: 217 mSDtfsCounter, 20 mSDsluCounter, 804 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 25 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 1021 SdHoareTripleChecker+Invalid, 329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 203 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:36,273 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 1021 Invalid, 329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 100 Invalid, 1 Unknown, 203 Unchecked, 4.2s Time] [2021-11-23 02:10:36,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-11-23 02:10:36,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 182. [2021-11-23 02:10:36,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 181 states have (on average 1.5469613259668509) internal successors, (280), 181 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:36,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 280 transitions. [2021-11-23 02:10:36,283 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 280 transitions. Word has length 60 [2021-11-23 02:10:36,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:36,284 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 280 transitions. [2021-11-23 02:10:36,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.0) internal successors, (70), 7 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) [2021-11-23 02:10:36,284 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 280 transitions. [2021-11-23 02:10:36,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 02:10:36,285 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:36,285 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:36,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:36,501 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:10:36,501 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:36,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:36,502 INFO L85 PathProgramCache]: Analyzing trace with hash -426584320, now seen corresponding path program 1 times [2021-11-23 02:10:36,502 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:10:36,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [587948240] [2021-11-23 02:10:36,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:36,503 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:10:36,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:10:36,503 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:10:36,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 02:10:36,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:36,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:10:36,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:36,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:36,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:36,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:36,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:36,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:36,870 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:10:37,257 INFO L354 Elim1Store]: treesize reduction 1130, result has 5.7 percent of original size [2021-11-23 02:10:37,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 7 case distinctions, treesize of input 80 treesize of output 78 [2021-11-23 02:10:40,468 INFO L354 Elim1Store]: treesize reduction 2459, result has 4.9 percent of original size [2021-11-23 02:10:40,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 80 case distinctions, treesize of input 238 treesize of output 174 [2021-11-23 02:10:47,823 INFO L354 Elim1Store]: treesize reduction 792, result has 0.1 percent of original size [2021-11-23 02:10:47,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 183 treesize of output 87 [2021-11-23 02:10:47,929 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:47,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:48,180 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:48,180 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:10:48,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [587948240] [2021-11-23 02:10:48,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [587948240] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:10:48,181 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:10:48,181 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-23 02:10:48,181 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682722252] [2021-11-23 02:10:48,181 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:10:48,181 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:10:48,181 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:10:48,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:10:48,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=26, Unknown=1, NotChecked=0, Total=42 [2021-11-23 02:10:48,182 INFO L87 Difference]: Start difference. First operand 182 states and 280 transitions. Second operand has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:50,199 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:10:53,070 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.12s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:10:54,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:54,062 INFO L93 Difference]: Finished difference Result 354 states and 549 transitions. [2021-11-23 02:10:54,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:10:54,064 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 0 states have call successors, (0), 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 60 [2021-11-23 02:10:54,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:54,065 INFO L225 Difference]: With dead ends: 354 [2021-11-23 02:10:54,065 INFO L226 Difference]: Without dead ends: 193 [2021-11-23 02:10:54,066 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=15, Invalid=26, Unknown=1, NotChecked=0, Total=42 [2021-11-23 02:10:54,066 INFO L933 BasicCegarLoop]: 209 mSDtfsCounter, 37 mSDsluCounter, 664 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 28 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 873 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 136 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:54,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 873 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 92 Invalid, 1 Unknown, 136 Unchecked, 5.9s Time] [2021-11-23 02:10:54,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-11-23 02:10:54,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 189. [2021-11-23 02:10:54,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 1.553191489361702) internal successors, (292), 188 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:54,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 292 transitions. [2021-11-23 02:10:54,077 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 292 transitions. Word has length 60 [2021-11-23 02:10:54,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:54,077 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 292 transitions. [2021-11-23 02:10:54,077 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:54,077 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 292 transitions. [2021-11-23 02:10:54,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 02:10:54,078 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:54,079 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:54,097 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (7)] Ended with exit code 0 [2021-11-23 02:10:54,290 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:10:54,290 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:54,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:54,290 INFO L85 PathProgramCache]: Analyzing trace with hash 1898096192, now seen corresponding path program 1 times [2021-11-23 02:10:54,291 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:10:54,291 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [800195039] [2021-11-23 02:10:54,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:54,291 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:10:54,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:10:54,292 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:10:54,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 02:10:54,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:54,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:10:54,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:54,726 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:54,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:54,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:54,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:54,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:10:54,733 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:10:55,077 INFO L354 Elim1Store]: treesize reduction 1130, result has 5.7 percent of original size [2021-11-23 02:10:55,077 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 7 case distinctions, treesize of input 80 treesize of output 78 [2021-11-23 02:10:58,221 INFO L354 Elim1Store]: treesize reduction 2459, result has 4.9 percent of original size [2021-11-23 02:10:58,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 80 case distinctions, treesize of input 238 treesize of output 174 [2021-11-23 02:11:05,342 INFO L354 Elim1Store]: treesize reduction 792, result has 0.1 percent of original size [2021-11-23 02:11:05,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 183 treesize of output 87 [2021-11-23 02:11:05,451 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:11:05,451 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:05,692 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:11:05,692 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:11:05,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [800195039] [2021-11-23 02:11:05,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [800195039] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:11:05,693 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:11:05,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-23 02:11:05,693 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089976179] [2021-11-23 02:11:05,693 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:11:05,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:11:05,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:11:05,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:11:05,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=26, Unknown=1, NotChecked=0, Total=42 [2021-11-23 02:11:05,694 INFO L87 Difference]: Start difference. First operand 189 states and 292 transitions. Second operand has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 7 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:07,715 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:11:10,880 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.38s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:11:13,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:13,821 INFO L93 Difference]: Finished difference Result 361 states and 560 transitions. [2021-11-23 02:11:13,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:11:13,823 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 7 states have internal predecessors, (75), 0 states have call successors, (0), 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 60 [2021-11-23 02:11:13,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:13,824 INFO L225 Difference]: With dead ends: 361 [2021-11-23 02:11:13,825 INFO L226 Difference]: Without dead ends: 193 [2021-11-23 02:11:13,825 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=15, Invalid=26, Unknown=1, NotChecked=0, Total=42 [2021-11-23 02:11:13,826 INFO L933 BasicCegarLoop]: 209 mSDtfsCounter, 35 mSDsluCounter, 570 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 30 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 779 SdHoareTripleChecker+Invalid, 210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 79 IncrementalHoareTripleChecker+Unchecked, 8.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:13,826 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 779 Invalid, 210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 100 Invalid, 1 Unknown, 79 Unchecked, 8.1s Time] [2021-11-23 02:11:13,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-11-23 02:11:13,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 189. [2021-11-23 02:11:13,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 1.5425531914893618) internal successors, (290), 188 states have internal predecessors, (290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:13,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 290 transitions. [2021-11-23 02:11:13,836 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 290 transitions. Word has length 60 [2021-11-23 02:11:13,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:13,836 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 290 transitions. [2021-11-23 02:11:13,836 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 7 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:13,836 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 290 transitions. [2021-11-23 02:11:13,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 02:11:13,837 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:13,838 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:13,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:11:14,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:11:14,046 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:14,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:14,047 INFO L85 PathProgramCache]: Analyzing trace with hash -1920769353, now seen corresponding path program 1 times [2021-11-23 02:11:14,047 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:11:14,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1973861706] [2021-11-23 02:11:14,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:14,048 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:11:14,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:11:14,048 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:11:14,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 02:11:14,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:14,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:11:14,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:14,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:14,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:14,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:14,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:14,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:14,545 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:11:14,874 INFO L354 Elim1Store]: treesize reduction 1130, result has 5.7 percent of original size [2021-11-23 02:11:14,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 7 case distinctions, treesize of input 80 treesize of output 78 [2021-11-23 02:11:18,084 INFO L354 Elim1Store]: treesize reduction 2459, result has 4.9 percent of original size [2021-11-23 02:11:18,084 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 80 case distinctions, treesize of input 238 treesize of output 174 [2021-11-23 02:11:24,830 INFO L354 Elim1Store]: treesize reduction 792, result has 0.1 percent of original size [2021-11-23 02:11:24,831 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 183 treesize of output 87 [2021-11-23 02:11:24,947 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:11:24,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:25,175 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:11:25,175 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:11:25,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1973861706] [2021-11-23 02:11:25,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1973861706] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:11:25,176 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:11:25,176 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-23 02:11:25,176 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375305375] [2021-11-23 02:11:25,176 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:11:25,177 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:11:25,177 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:11:25,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:11:25,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=26, Unknown=1, NotChecked=0, Total=42 [2021-11-23 02:11:25,180 INFO L87 Difference]: Start difference. First operand 189 states and 290 transitions. Second operand has 7 states, 7 states have (on average 10.285714285714286) internal successors, (72), 7 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:27,206 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:11:29,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:29,057 INFO L93 Difference]: Finished difference Result 358 states and 555 transitions. [2021-11-23 02:11:29,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:11:29,059 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.285714285714286) internal successors, (72), 7 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-23 02:11:29,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:29,061 INFO L225 Difference]: With dead ends: 358 [2021-11-23 02:11:29,061 INFO L226 Difference]: Without dead ends: 190 [2021-11-23 02:11:29,061 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 114 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=15, Invalid=26, Unknown=1, NotChecked=0, Total=42 [2021-11-23 02:11:29,062 INFO L933 BasicCegarLoop]: 216 mSDtfsCounter, 27 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 25 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 565 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 36 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:29,062 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 565 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 88 Invalid, 1 Unknown, 36 Unchecked, 3.9s Time] [2021-11-23 02:11:29,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-11-23 02:11:29,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 190. [2021-11-23 02:11:29,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 189 states have (on average 1.5343915343915344) internal successors, (290), 189 states have internal predecessors, (290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:29,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 290 transitions. [2021-11-23 02:11:29,076 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 290 transitions. Word has length 61 [2021-11-23 02:11:29,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:29,079 INFO L470 AbstractCegarLoop]: Abstraction has 190 states and 290 transitions. [2021-11-23 02:11:29,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.285714285714286) internal successors, (72), 7 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:29,079 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 290 transitions. [2021-11-23 02:11:29,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 02:11:29,081 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:29,082 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:29,095 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:11:29,290 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:11:29,290 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:29,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:29,290 INFO L85 PathProgramCache]: Analyzing trace with hash 1011603538, now seen corresponding path program 1 times [2021-11-23 02:11:29,291 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:11:29,291 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [719546805] [2021-11-23 02:11:29,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:29,291 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:11:29,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:11:29,292 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:11:29,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 02:11:29,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:29,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:11:29,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:29,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:29,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:29,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:29,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:29,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:29,751 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:11:30,105 INFO L354 Elim1Store]: treesize reduction 1130, result has 5.7 percent of original size [2021-11-23 02:11:30,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 7 case distinctions, treesize of input 80 treesize of output 78 [2021-11-23 02:11:33,233 INFO L354 Elim1Store]: treesize reduction 2459, result has 4.9 percent of original size [2021-11-23 02:11:33,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 80 case distinctions, treesize of input 238 treesize of output 174 [2021-11-23 02:11:40,060 INFO L354 Elim1Store]: treesize reduction 792, result has 0.1 percent of original size [2021-11-23 02:11:40,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 183 treesize of output 87 [2021-11-23 02:11:40,175 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:11:40,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:40,410 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:11:40,410 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:11:40,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [719546805] [2021-11-23 02:11:40,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [719546805] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:11:40,410 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:11:40,411 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-23 02:11:40,411 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364035646] [2021-11-23 02:11:40,411 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:11:40,411 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:11:40,412 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:11:40,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:11:40,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=26, Unknown=1, NotChecked=0, Total=42 [2021-11-23 02:11:40,412 INFO L87 Difference]: Start difference. First operand 190 states and 290 transitions. Second operand has 7 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:40,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:40,992 INFO L93 Difference]: Finished difference Result 359 states and 554 transitions. [2021-11-23 02:11:40,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:11:40,993 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 0 states have call successors, (0), 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 [2021-11-23 02:11:40,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:40,994 INFO L225 Difference]: With dead ends: 359 [2021-11-23 02:11:40,995 INFO L226 Difference]: Without dead ends: 190 [2021-11-23 02:11:40,995 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 116 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=15, Invalid=26, Unknown=1, NotChecked=0, Total=42 [2021-11-23 02:11:40,996 INFO L933 BasicCegarLoop]: 223 mSDtfsCounter, 10 mSDsluCounter, 692 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 915 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 102 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:40,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 915 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 102 Unchecked, 0.6s Time] [2021-11-23 02:11:40,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-11-23 02:11:41,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 190. [2021-11-23 02:11:41,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 189 states have (on average 1.529100529100529) internal successors, (289), 189 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:41,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 289 transitions. [2021-11-23 02:11:41,005 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 289 transitions. Word has length 62 [2021-11-23 02:11:41,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:41,006 INFO L470 AbstractCegarLoop]: Abstraction has 190 states and 289 transitions. [2021-11-23 02:11:41,006 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:41,006 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 289 transitions. [2021-11-23 02:11:41,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 02:11:41,007 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:41,007 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:41,026 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (10)] Ended with exit code 0 [2021-11-23 02:11:41,222 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:11:41,223 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:41,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:41,223 INFO L85 PathProgramCache]: Analyzing trace with hash -2021179534, now seen corresponding path program 1 times [2021-11-23 02:11:41,223 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:11:41,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1198015894] [2021-11-23 02:11:41,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:41,224 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:11:41,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:11:41,224 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:11:41,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 02:11:41,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:41,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:11:41,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:41,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:41,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:41,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:41,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:41,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:41,698 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:11:42,089 INFO L354 Elim1Store]: treesize reduction 1130, result has 5.7 percent of original size [2021-11-23 02:11:42,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 7 case distinctions, treesize of input 80 treesize of output 78 [2021-11-23 02:11:45,168 INFO L354 Elim1Store]: treesize reduction 2459, result has 4.9 percent of original size [2021-11-23 02:11:45,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 80 case distinctions, treesize of input 238 treesize of output 174 [2021-11-23 02:11:52,129 INFO L354 Elim1Store]: treesize reduction 792, result has 0.1 percent of original size [2021-11-23 02:11:52,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 183 treesize of output 87 [2021-11-23 02:11:52,263 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:11:52,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:52,523 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:11:52,523 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:11:52,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1198015894] [2021-11-23 02:11:52,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1198015894] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:11:52,523 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:11:52,523 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-23 02:11:52,524 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223875276] [2021-11-23 02:11:52,524 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:11:52,524 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:11:52,524 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:11:52,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:11:52,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=26, Unknown=1, NotChecked=0, Total=42 [2021-11-23 02:11:52,525 INFO L87 Difference]: Start difference. First operand 190 states and 289 transitions. Second operand has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:53,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:53,085 INFO L93 Difference]: Finished difference Result 359 states and 553 transitions. [2021-11-23 02:11:53,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:11:53,085 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 0 states have call successors, (0), 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 63 [2021-11-23 02:11:53,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:53,086 INFO L225 Difference]: With dead ends: 359 [2021-11-23 02:11:53,086 INFO L226 Difference]: Without dead ends: 190 [2021-11-23 02:11:53,087 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=15, Invalid=26, Unknown=1, NotChecked=0, Total=42 [2021-11-23 02:11:53,087 INFO L933 BasicCegarLoop]: 222 mSDtfsCounter, 10 mSDsluCounter, 470 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 692 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 101 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:53,087 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 692 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 101 Unchecked, 0.6s Time] [2021-11-23 02:11:53,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-11-23 02:11:53,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 190. [2021-11-23 02:11:53,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 189 states have (on average 1.5238095238095237) internal successors, (288), 189 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:53,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 288 transitions. [2021-11-23 02:11:53,096 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 288 transitions. Word has length 63 [2021-11-23 02:11:53,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:53,096 INFO L470 AbstractCegarLoop]: Abstraction has 190 states and 288 transitions. [2021-11-23 02:11:53,096 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:53,097 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 288 transitions. [2021-11-23 02:11:53,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 02:11:53,097 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:53,098 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, 1, 1] [2021-11-23 02:11:53,122 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:11:53,321 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:11:53,322 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:53,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:53,322 INFO L85 PathProgramCache]: Analyzing trace with hash 485580554, now seen corresponding path program 1 times [2021-11-23 02:11:53,322 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:11:53,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1980399052] [2021-11-23 02:11:53,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:53,323 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:11:53,323 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:11:53,323 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:11:53,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 02:11:53,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:53,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:11:53,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:53,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:53,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:53,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:53,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:53,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:53,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:53,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:53,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:53,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:53,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:53,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:53,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:53,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:11:53,815 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:11:53,816 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:11:53,816 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:11:53,817 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:11:53,817 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:11:54,154 INFO L354 Elim1Store]: treesize reduction 1134, result has 5.3 percent of original size [2021-11-23 02:11:54,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 7 case distinctions, treesize of input 56 treesize of output 74 [2021-11-23 02:11:55,110 INFO L354 Elim1Store]: treesize reduction 336, result has 0.3 percent of original size [2021-11-23 02:11:55,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 107 treesize of output 35 [2021-11-23 02:11:55,172 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:11:55,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:55,381 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:11:55,382 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:11:55,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1980399052] [2021-11-23 02:11:55,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1980399052] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:11:55,382 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:11:55,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 5 [2021-11-23 02:11:55,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283939894] [2021-11-23 02:11:55,382 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:11:55,382 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:11:55,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:11:55,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:11:55,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:11:55,383 INFO L87 Difference]: Start difference. First operand 190 states and 288 transitions. Second operand has 5 states, 5 states have (on average 16.0) internal successors, (80), 5 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) [2021-11-23 02:11:57,418 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:12:05,857 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.23s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:12:08,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:08,086 INFO L93 Difference]: Finished difference Result 400 states and 611 transitions. [2021-11-23 02:12:08,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:12:08,088 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 16.0) internal successors, (80), 5 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 63 [2021-11-23 02:12:08,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:08,089 INFO L225 Difference]: With dead ends: 400 [2021-11-23 02:12:08,090 INFO L226 Difference]: Without dead ends: 231 [2021-11-23 02:12:08,090 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 120 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:12:08,091 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 58 mSDsluCounter, 344 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 16 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 559 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:08,091 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 559 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 162 Invalid, 1 Unknown, 0 Unchecked, 12.6s Time] [2021-11-23 02:12:08,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-11-23 02:12:08,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 212. [2021-11-23 02:12:08,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 211 states have (on average 1.5213270142180095) internal successors, (321), 211 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:12:08,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 321 transitions. [2021-11-23 02:12:08,109 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 321 transitions. Word has length 63 [2021-11-23 02:12:08,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:08,109 INFO L470 AbstractCegarLoop]: Abstraction has 212 states and 321 transitions. [2021-11-23 02:12:08,110 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 16.0) internal successors, (80), 5 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) [2021-11-23 02:12:08,110 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 321 transitions. [2021-11-23 02:12:08,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-23 02:12:08,111 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:08,111 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:12:08,127 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:08,318 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:12:08,321 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:08,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:08,321 INFO L85 PathProgramCache]: Analyzing trace with hash 103289337, now seen corresponding path program 1 times [2021-11-23 02:12:08,322 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:12:08,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1374970937] [2021-11-23 02:12:08,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:08,322 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:12:08,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:12:08,323 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:12:08,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 02:12:08,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:08,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:12:08,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:08,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:08,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:08,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:08,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:08,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:08,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:08,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:08,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:08,837 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:08,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:08,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:08,843 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:08,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:08,845 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:12:08,846 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:12:08,846 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:12:08,847 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:12:08,847 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:12:09,201 INFO L354 Elim1Store]: treesize reduction 1134, result has 5.3 percent of original size [2021-11-23 02:12:09,202 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 7 case distinctions, treesize of input 56 treesize of output 74 [2021-11-23 02:12:09,865 INFO L354 Elim1Store]: treesize reduction 336, result has 0.3 percent of original size [2021-11-23 02:12:09,866 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 107 treesize of output 35 [2021-11-23 02:12:09,969 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 30 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:12:09,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:12:10,193 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 30 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:12:10,193 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:12:10,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1374970937] [2021-11-23 02:12:10,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1374970937] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:10,194 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:12:10,194 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-23 02:12:10,194 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441018756] [2021-11-23 02:12:10,194 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:10,195 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:12:10,195 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:12:10,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:12:10,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:12:10,196 INFO L87 Difference]: Start difference. First operand 212 states and 321 transitions. Second operand has 6 states, 6 states have (on average 14.666666666666666) internal successors, (88), 6 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:12:12,220 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:12:14,229 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:12:24,728 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.19s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:12:35,213 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.68s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:12:36,411 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.20s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:12:37,588 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.18s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:12:41,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:41,577 INFO L93 Difference]: Finished difference Result 543 states and 834 transitions. [2021-11-23 02:12:41,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:12:41,579 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.666666666666666) internal successors, (88), 6 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-23 02:12:41,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:41,582 INFO L225 Difference]: With dead ends: 543 [2021-11-23 02:12:41,582 INFO L226 Difference]: Without dead ends: 352 [2021-11-23 02:12:41,583 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:12:41,584 INFO L933 BasicCegarLoop]: 283 mSDtfsCounter, 195 mSDsluCounter, 924 mSDsCounter, 0 mSdLazyCounter, 546 mSolverCounterSat, 48 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 30.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 1207 SdHoareTripleChecker+Invalid, 596 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 546 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 31.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:41,584 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [195 Valid, 1207 Invalid, 596 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 546 Invalid, 2 Unknown, 0 Unchecked, 31.3s Time] [2021-11-23 02:12:41,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2021-11-23 02:12:41,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 228. [2021-11-23 02:12:41,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 227 states have (on average 1.5110132158590308) internal successors, (343), 227 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:12:41,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 343 transitions. [2021-11-23 02:12:41,594 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 343 transitions. Word has length 76 [2021-11-23 02:12:41,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:41,594 INFO L470 AbstractCegarLoop]: Abstraction has 228 states and 343 transitions. [2021-11-23 02:12:41,595 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.666666666666666) internal successors, (88), 6 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:12:41,595 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 343 transitions. [2021-11-23 02:12:41,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 02:12:41,596 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:41,596 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:12:41,623 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:41,810 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:12:41,810 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:41,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:41,810 INFO L85 PathProgramCache]: Analyzing trace with hash 873631865, now seen corresponding path program 1 times [2021-11-23 02:12:41,811 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:12:41,811 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [538466233] [2021-11-23 02:12:41,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:41,811 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:12:41,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:12:41,812 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:12:41,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 02:12:42,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:42,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:12:42,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:42,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:42,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:42,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:42,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:42,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:42,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:42,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:42,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:42,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:42,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:42,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:42,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:42,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:42,555 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:12:42,555 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:12:42,556 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:12:42,556 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:12:42,557 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:12:42,931 INFO L354 Elim1Store]: treesize reduction 1134, result has 5.3 percent of original size [2021-11-23 02:12:42,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 7 case distinctions, treesize of input 56 treesize of output 74 [2021-11-23 02:12:43,480 INFO L354 Elim1Store]: treesize reduction 336, result has 0.3 percent of original size [2021-11-23 02:12:43,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 107 treesize of output 35 [2021-11-23 02:12:43,629 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:12:43,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:12:43,917 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:12:43,917 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:12:43,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [538466233] [2021-11-23 02:12:43,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [538466233] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:43,918 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:12:43,918 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-23 02:12:43,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564858026] [2021-11-23 02:12:43,918 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:43,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:12:43,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:12:43,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:12:43,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:12:43,919 INFO L87 Difference]: Start difference. First operand 228 states and 343 transitions. Second operand has 6 states, 6 states have (on average 14.833333333333334) internal successors, (89), 6 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:12:45,940 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:12:51,599 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.05s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:12:55,655 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.47s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:13:00,739 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.94s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:13:03,539 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.57s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:13:06,247 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.65s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:13:10,543 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:13:10,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:13:10,774 INFO L93 Difference]: Finished difference Result 563 states and 856 transitions. [2021-11-23 02:13:10,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:13:10,776 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.833333333333334) internal successors, (89), 6 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-23 02:13:10,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:13:10,778 INFO L225 Difference]: With dead ends: 563 [2021-11-23 02:13:10,779 INFO L226 Difference]: Without dead ends: 356 [2021-11-23 02:13:10,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:13:10,780 INFO L933 BasicCegarLoop]: 149 mSDtfsCounter, 202 mSDsluCounter, 517 mSDsCounter, 0 mSdLazyCounter, 447 mSolverCounterSat, 67 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 26.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 202 SdHoareTripleChecker+Valid, 666 SdHoareTripleChecker+Invalid, 516 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 447 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 26.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:13:10,780 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [202 Valid, 666 Invalid, 516 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 447 Invalid, 2 Unknown, 0 Unchecked, 26.7s Time] [2021-11-23 02:13:10,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2021-11-23 02:13:10,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 253. [2021-11-23 02:13:10,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 1.4880952380952381) internal successors, (375), 252 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:13:10,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 375 transitions. [2021-11-23 02:13:10,792 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 375 transitions. Word has length 79 [2021-11-23 02:13:10,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:13:10,793 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 375 transitions. [2021-11-23 02:13:10,793 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.833333333333334) internal successors, (89), 6 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:13:10,793 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 375 transitions. [2021-11-23 02:13:10,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 02:13:10,794 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:13:10,794 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:13:10,817 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-23 02:13:11,012 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:13:11,012 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:13:11,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:13:11,012 INFO L85 PathProgramCache]: Analyzing trace with hash -2003334101, now seen corresponding path program 1 times [2021-11-23 02:13:11,013 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:13:11,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2146604295] [2021-11-23 02:13:11,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:11,014 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:13:11,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:13:11,014 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:13:11,016 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 02:13:11,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:11,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:13:11,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:11,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:11,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:11,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:11,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:11,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:11,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:11,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:11,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:11,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:11,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:11,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:11,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:11,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:11,657 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:13:11,658 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:13:11,658 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:13:11,659 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:13:11,659 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:13:12,003 INFO L354 Elim1Store]: treesize reduction 1134, result has 5.3 percent of original size [2021-11-23 02:13:12,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 7 case distinctions, treesize of input 56 treesize of output 74 [2021-11-23 02:13:12,582 INFO L354 Elim1Store]: treesize reduction 336, result has 0.3 percent of original size [2021-11-23 02:13:12,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 107 treesize of output 35 [2021-11-23 02:13:12,695 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:13:12,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:12,938 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:13:12,938 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:13:12,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2146604295] [2021-11-23 02:13:12,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2146604295] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:13:12,938 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:13:12,938 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-23 02:13:12,939 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903728099] [2021-11-23 02:13:12,939 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:13:12,939 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:13:12,939 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:13:12,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:13:12,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:13:12,940 INFO L87 Difference]: Start difference. First operand 253 states and 375 transitions. Second operand has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:13:14,963 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:13:16,471 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.05s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:13:22,008 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.37s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:13:26,666 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:13:28,084 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.42s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:13:33,054 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.07s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:13:34,982 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:13:39,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:13:39,618 INFO L93 Difference]: Finished difference Result 589 states and 892 transitions. [2021-11-23 02:13:39,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:13:39,619 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-23 02:13:39,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:13:39,621 INFO L225 Difference]: With dead ends: 589 [2021-11-23 02:13:39,621 INFO L226 Difference]: Without dead ends: 357 [2021-11-23 02:13:39,622 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:13:39,622 INFO L933 BasicCegarLoop]: 161 mSDtfsCounter, 188 mSDsluCounter, 583 mSDsCounter, 0 mSdLazyCounter, 489 mSolverCounterSat, 61 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 25.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 744 SdHoareTripleChecker+Invalid, 551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 489 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 26.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:13:39,623 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [188 Valid, 744 Invalid, 551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 489 Invalid, 1 Unknown, 0 Unchecked, 26.6s Time] [2021-11-23 02:13:39,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2021-11-23 02:13:39,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 242. [2021-11-23 02:13:39,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 241 states have (on average 1.4813278008298756) internal successors, (357), 241 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:13:39,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 357 transitions. [2021-11-23 02:13:39,632 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 357 transitions. Word has length 80 [2021-11-23 02:13:39,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:13:39,632 INFO L470 AbstractCegarLoop]: Abstraction has 242 states and 357 transitions. [2021-11-23 02:13:39,632 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:13:39,633 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 357 transitions. [2021-11-23 02:13:39,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 02:13:39,634 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:13:39,634 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:13:39,649 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (15)] Ended with exit code 0 [2021-11-23 02:13:39,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:13:39,841 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:13:39,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:13:39,841 INFO L85 PathProgramCache]: Analyzing trace with hash -1965557864, now seen corresponding path program 1 times [2021-11-23 02:13:39,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:13:39,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [111907358] [2021-11-23 02:13:39,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:39,842 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:13:39,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:13:39,844 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:13:39,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 02:13:40,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:40,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:13:40,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:40,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:40,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:40,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:40,390 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:40,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:40,392 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:13:40,468 INFO L354 Elim1Store]: treesize reduction 188, result has 13.8 percent of original size [2021-11-23 02:13:40,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 40 [2021-11-23 02:13:40,533 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:13:40,533 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:13:40,534 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:13:40,823 INFO L354 Elim1Store]: treesize reduction 850, result has 7.0 percent of original size [2021-11-23 02:13:40,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 13 case distinctions, treesize of input 72 treesize of output 89 [2021-11-23 02:13:42,913 INFO L354 Elim1Store]: treesize reduction 336, result has 0.3 percent of original size [2021-11-23 02:13:42,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 110 treesize of output 38 [2021-11-23 02:13:42,951 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:13:42,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:43,292 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:13:43,293 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:13:43,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [111907358] [2021-11-23 02:13:43,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [111907358] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:13:43,293 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:13:43,293 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-23 02:13:43,293 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101226791] [2021-11-23 02:13:43,293 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:13:43,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:13:43,294 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:13:43,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:13:43,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:13:43,294 INFO L87 Difference]: Start difference. First operand 242 states and 357 transitions. Second operand has 7 states, 7 states have (on average 15.857142857142858) internal successors, (111), 7 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:13:45,313 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:13:53,393 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.34s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:13:55,395 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:01,227 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.62s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:02,244 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:05,062 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:07,734 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.03s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:10,828 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.50s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:12,308 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.48s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:15,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:15,102 INFO L93 Difference]: Finished difference Result 706 states and 1063 transitions. [2021-11-23 02:14:15,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:14:15,103 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 15.857142857142858) internal successors, (111), 7 states have internal predecessors, (111), 0 states have call successors, (0), 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 85 [2021-11-23 02:14:15,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:15,106 INFO L225 Difference]: With dead ends: 706 [2021-11-23 02:14:15,106 INFO L226 Difference]: Without dead ends: 485 [2021-11-23 02:14:15,107 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 162 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:14:15,108 INFO L933 BasicCegarLoop]: 177 mSDtfsCounter, 438 mSDsluCounter, 592 mSDsCounter, 0 mSdLazyCounter, 519 mSolverCounterSat, 89 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 30.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 438 SdHoareTripleChecker+Valid, 769 SdHoareTripleChecker+Invalid, 610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 519 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 31.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:15,108 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [438 Valid, 769 Invalid, 610 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 519 Invalid, 2 Unknown, 0 Unchecked, 31.7s Time] [2021-11-23 02:14:15,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 485 states. [2021-11-23 02:14:15,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 485 to 296. [2021-11-23 02:14:15,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 296 states, 295 states have (on average 1.505084745762712) internal successors, (444), 295 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:14:15,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 444 transitions. [2021-11-23 02:14:15,122 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 444 transitions. Word has length 85 [2021-11-23 02:14:15,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:15,123 INFO L470 AbstractCegarLoop]: Abstraction has 296 states and 444 transitions. [2021-11-23 02:14:15,123 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 15.857142857142858) internal successors, (111), 7 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:14:15,123 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 444 transitions. [2021-11-23 02:14:15,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 02:14:15,124 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:15,125 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:15,143 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 02:14:15,340 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:14:15,341 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:15,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:15,341 INFO L85 PathProgramCache]: Analyzing trace with hash -660899661, now seen corresponding path program 1 times [2021-11-23 02:14:15,342 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:14:15,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [801975813] [2021-11-23 02:14:15,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:15,342 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:14:15,342 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:14:15,343 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:14:15,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 02:14:15,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:15,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:14:15,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:14:15,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:14:15,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:14:15,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:14:15,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:14:15,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:14:15,985 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:14:16,062 INFO L354 Elim1Store]: treesize reduction 188, result has 13.8 percent of original size [2021-11-23 02:14:16,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 40 [2021-11-23 02:14:16,119 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:14:16,119 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:14:16,120 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:14:16,407 INFO L354 Elim1Store]: treesize reduction 850, result has 7.0 percent of original size [2021-11-23 02:14:16,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 13 case distinctions, treesize of input 72 treesize of output 89 [2021-11-23 02:14:18,421 INFO L354 Elim1Store]: treesize reduction 336, result has 0.3 percent of original size [2021-11-23 02:14:18,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 110 treesize of output 38 [2021-11-23 02:14:18,454 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:14:18,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:14:18,822 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:14:18,822 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:14:18,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [801975813] [2021-11-23 02:14:18,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [801975813] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:18,822 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:18,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-23 02:14:18,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199317595] [2021-11-23 02:14:18,823 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:18,823 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:14:18,823 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:14:18,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:14:18,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:14:18,824 INFO L87 Difference]: Start difference. First operand 296 states and 444 transitions. Second operand has 7 states, 7 states have (on average 16.142857142857142) internal successors, (113), 7 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:14:20,855 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:22,864 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:31,788 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.33s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:33,675 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.39s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:38,236 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.24s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:39,939 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.70s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:49,206 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:51,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:51,838 INFO L93 Difference]: Finished difference Result 771 states and 1176 transitions. [2021-11-23 02:14:51,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:14:51,840 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 16.142857142857142) internal successors, (113), 7 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-23 02:14:51,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:51,843 INFO L225 Difference]: With dead ends: 771 [2021-11-23 02:14:51,843 INFO L226 Difference]: Without dead ends: 496 [2021-11-23 02:14:51,844 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 164 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:14:51,844 INFO L933 BasicCegarLoop]: 190 mSDtfsCounter, 335 mSDsluCounter, 652 mSDsCounter, 0 mSdLazyCounter, 532 mSolverCounterSat, 80 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 32.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 335 SdHoareTripleChecker+Valid, 842 SdHoareTripleChecker+Invalid, 615 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 532 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 32.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:51,845 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [335 Valid, 842 Invalid, 615 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 532 Invalid, 3 Unknown, 0 Unchecked, 32.9s Time] [2021-11-23 02:14:51,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2021-11-23 02:14:51,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 318. [2021-11-23 02:14:51,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 318 states, 317 states have (on average 1.5362776025236593) internal successors, (487), 317 states have internal predecessors, (487), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:14:51,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 487 transitions. [2021-11-23 02:14:51,858 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 487 transitions. Word has length 86 [2021-11-23 02:14:51,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:51,859 INFO L470 AbstractCegarLoop]: Abstraction has 318 states and 487 transitions. [2021-11-23 02:14:51,859 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 16.142857142857142) internal successors, (113), 7 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:14:51,859 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 487 transitions. [2021-11-23 02:14:51,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 02:14:51,861 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:51,861 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, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:51,879 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (17)] Ended with exit code 0 [2021-11-23 02:14:52,078 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:14:52,078 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:52,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:52,079 INFO L85 PathProgramCache]: Analyzing trace with hash 1795100272, now seen corresponding path program 1 times [2021-11-23 02:14:52,080 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:14:52,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1860238905] [2021-11-23 02:14:52,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:52,080 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:14:52,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:14:52,081 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:14:52,102 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 02:14:52,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:52,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:14:52,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:14:52,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:14:52,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:14:52,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:14:52,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:14:52,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:14:52,681 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:14:52,788 INFO L354 Elim1Store]: treesize reduction 188, result has 13.8 percent of original size [2021-11-23 02:14:52,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 40 [2021-11-23 02:14:52,865 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:14:52,866 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:14:52,866 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:14:53,171 INFO L354 Elim1Store]: treesize reduction 850, result has 7.0 percent of original size [2021-11-23 02:14:53,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 13 case distinctions, treesize of input 72 treesize of output 89 [2021-11-23 02:14:54,691 INFO L354 Elim1Store]: treesize reduction 336, result has 0.3 percent of original size [2021-11-23 02:14:54,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 110 treesize of output 38 [2021-11-23 02:14:54,804 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 83 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:14:54,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:14:55,193 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 83 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:14:55,194 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:14:55,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1860238905] [2021-11-23 02:14:55,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1860238905] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:55,194 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:55,194 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-23 02:14:55,194 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241999336] [2021-11-23 02:14:55,194 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:55,195 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:14:55,195 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:14:55,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:14:55,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:14:55,195 INFO L87 Difference]: Start difference. First operand 318 states and 487 transitions. Second operand has 7 states, 7 states have (on average 19.0) internal successors, (133), 7 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:14:57,237 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:07,283 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.43s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:09,737 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.17s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:15,041 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.93s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:16,656 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.61s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:21,797 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.09s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:23,436 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.06s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:24,858 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.40s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:26,123 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.26s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:29,454 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.54s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:31,186 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.73s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:32,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:32,813 INFO L93 Difference]: Finished difference Result 839 states and 1299 transitions. [2021-11-23 02:15:32,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:15:32,814 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 19.0) internal successors, (133), 7 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2021-11-23 02:15:32,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:32,816 INFO L225 Difference]: With dead ends: 839 [2021-11-23 02:15:32,817 INFO L226 Difference]: Without dead ends: 542 [2021-11-23 02:15:32,817 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 220 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:15:32,818 INFO L933 BasicCegarLoop]: 186 mSDtfsCounter, 233 mSDsluCounter, 770 mSDsCounter, 0 mSdLazyCounter, 610 mSolverCounterSat, 54 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 36.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 956 SdHoareTripleChecker+Invalid, 665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 610 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 37.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:32,818 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [233 Valid, 956 Invalid, 665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 610 Invalid, 1 Unknown, 0 Unchecked, 37.5s Time] [2021-11-23 02:15:32,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2021-11-23 02:15:32,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 369. [2021-11-23 02:15:32,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 369 states, 368 states have (on average 1.548913043478261) internal successors, (570), 368 states have internal predecessors, (570), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:15:32,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369 states to 369 states and 570 transitions. [2021-11-23 02:15:32,834 INFO L78 Accepts]: Start accepts. Automaton has 369 states and 570 transitions. Word has length 114 [2021-11-23 02:15:32,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:32,834 INFO L470 AbstractCegarLoop]: Abstraction has 369 states and 570 transitions. [2021-11-23 02:15:32,835 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 19.0) internal successors, (133), 7 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:15:32,835 INFO L276 IsEmpty]: Start isEmpty. Operand 369 states and 570 transitions. [2021-11-23 02:15:32,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-23 02:15:32,836 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:32,837 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, 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] [2021-11-23 02:15:32,866 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:33,055 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:15:33,056 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:15:33,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:33,056 INFO L85 PathProgramCache]: Analyzing trace with hash -688905657, now seen corresponding path program 1 times [2021-11-23 02:15:33,057 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:15:33,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [859497528] [2021-11-23 02:15:33,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:33,057 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:15:33,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:15:33,058 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:15:33,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 02:15:33,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:33,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:15:33,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:33,552 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:15:33,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:33,815 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:15:33,816 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:15:33,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [859497528] [2021-11-23 02:15:33,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [859497528] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:15:33,816 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:15:33,816 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-23 02:15:33,816 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082738318] [2021-11-23 02:15:33,816 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:15:33,817 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:15:33,817 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:15:33,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:15:33,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:15:33,818 INFO L87 Difference]: Start difference. First operand 369 states and 570 transitions. Second operand has 4 states, 4 states have (on average 37.0) internal successors, (148), 4 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:15:34,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:34,704 INFO L93 Difference]: Finished difference Result 1373 states and 2148 transitions. [2021-11-23 02:15:34,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:15:34,704 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 37.0) internal successors, (148), 4 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 120 [2021-11-23 02:15:34,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:34,709 INFO L225 Difference]: With dead ends: 1373 [2021-11-23 02:15:34,709 INFO L226 Difference]: Without dead ends: 1025 [2021-11-23 02:15:34,710 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 236 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:15:34,711 INFO L933 BasicCegarLoop]: 245 mSDtfsCounter, 325 mSDsluCounter, 363 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 325 SdHoareTripleChecker+Valid, 608 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:34,711 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [325 Valid, 608 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:15:34,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1025 states. [2021-11-23 02:15:34,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1025 to 1016. [2021-11-23 02:15:34,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1016 states, 1015 states have (on average 1.5458128078817734) internal successors, (1569), 1015 states have internal predecessors, (1569), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:15:34,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1016 states to 1016 states and 1569 transitions. [2021-11-23 02:15:34,762 INFO L78 Accepts]: Start accepts. Automaton has 1016 states and 1569 transitions. Word has length 120 [2021-11-23 02:15:34,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:34,762 INFO L470 AbstractCegarLoop]: Abstraction has 1016 states and 1569 transitions. [2021-11-23 02:15:34,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 37.0) internal successors, (148), 4 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:15:34,763 INFO L276 IsEmpty]: Start isEmpty. Operand 1016 states and 1569 transitions. [2021-11-23 02:15:34,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-23 02:15:34,765 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:34,765 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, 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] [2021-11-23 02:15:34,785 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:34,978 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:15:34,978 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:15:34,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:34,978 INFO L85 PathProgramCache]: Analyzing trace with hash -440759163, now seen corresponding path program 1 times [2021-11-23 02:15:34,979 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:15:34,979 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1694513724] [2021-11-23 02:15:34,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:34,979 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:15:34,979 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:15:34,980 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:15:34,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 02:15:35,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:35,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:15:35,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:35,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:15:35,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:15:35,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:15:35,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:15:35,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:15:35,484 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:15:35,561 INFO L354 Elim1Store]: treesize reduction 188, result has 13.8 percent of original size [2021-11-23 02:15:35,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 40 [2021-11-23 02:15:35,626 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:15:35,627 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:15:35,627 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:15:35,910 INFO L354 Elim1Store]: treesize reduction 850, result has 7.0 percent of original size [2021-11-23 02:15:35,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 13 case distinctions, treesize of input 72 treesize of output 89 [2021-11-23 02:15:37,793 INFO L354 Elim1Store]: treesize reduction 336, result has 0.3 percent of original size [2021-11-23 02:15:37,793 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 110 treesize of output 38 [2021-11-23 02:15:37,925 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:15:37,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:38,397 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:15:38,397 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:15:38,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1694513724] [2021-11-23 02:15:38,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1694513724] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:15:38,398 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:15:38,398 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-23 02:15:38,398 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861741861] [2021-11-23 02:15:38,398 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:15:38,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:15:38,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:15:38,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:15:38,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:15:38,399 INFO L87 Difference]: Start difference. First operand 1016 states and 1569 transitions. Second operand has 7 states, 7 states have (on average 20.571428571428573) internal successors, (144), 7 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:15:40,426 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:49,579 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:50,778 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.19s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:55,360 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.38s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:56,984 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.58s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:58,192 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.21s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:16:01,360 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:16:08,979 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.14s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:16:09,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:16:09,182 INFO L93 Difference]: Finished difference Result 2637 states and 4039 transitions. [2021-11-23 02:16:09,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:16:09,184 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 20.571428571428573) internal successors, (144), 7 states have internal predecessors, (144), 0 states have call successors, (0), 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 120 [2021-11-23 02:16:09,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:16:09,193 INFO L225 Difference]: With dead ends: 2637 [2021-11-23 02:16:09,193 INFO L226 Difference]: Without dead ends: 1642 [2021-11-23 02:16:09,195 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 232 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:16:09,196 INFO L933 BasicCegarLoop]: 161 mSDtfsCounter, 315 mSDsluCounter, 515 mSDsCounter, 0 mSdLazyCounter, 494 mSolverCounterSat, 76 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 29.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 315 SdHoareTripleChecker+Valid, 676 SdHoareTripleChecker+Invalid, 571 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 494 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 30.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:16:09,196 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [315 Valid, 676 Invalid, 571 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 494 Invalid, 1 Unknown, 0 Unchecked, 30.6s Time] [2021-11-23 02:16:09,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1642 states. [2021-11-23 02:16:09,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1642 to 1127. [2021-11-23 02:16:09,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1127 states, 1126 states have (on average 1.5479573712255772) internal successors, (1743), 1126 states have internal predecessors, (1743), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:16:09,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1127 states to 1127 states and 1743 transitions. [2021-11-23 02:16:09,254 INFO L78 Accepts]: Start accepts. Automaton has 1127 states and 1743 transitions. Word has length 120 [2021-11-23 02:16:09,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:16:09,254 INFO L470 AbstractCegarLoop]: Abstraction has 1127 states and 1743 transitions. [2021-11-23 02:16:09,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 20.571428571428573) internal successors, (144), 7 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:16:09,255 INFO L276 IsEmpty]: Start isEmpty. Operand 1127 states and 1743 transitions. [2021-11-23 02:16:09,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-23 02:16:09,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:16:09,258 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, 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] [2021-11-23 02:16:09,278 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 02:16:09,479 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:16:09,479 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:16:09,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:16:09,480 INFO L85 PathProgramCache]: Analyzing trace with hash -404149718, now seen corresponding path program 1 times [2021-11-23 02:16:09,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:16:09,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1219551621] [2021-11-23 02:16:09,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:09,481 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:16:09,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:16:09,482 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:16:09,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 02:16:10,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:10,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:16:10,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:16:10,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:16:10,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:16:10,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:16:10,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:16:10,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:16:10,117 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:16:10,193 INFO L354 Elim1Store]: treesize reduction 188, result has 13.8 percent of original size [2021-11-23 02:16:10,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 40 [2021-11-23 02:16:10,249 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:16:10,256 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:16:10,256 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:16:10,537 INFO L354 Elim1Store]: treesize reduction 850, result has 7.0 percent of original size [2021-11-23 02:16:10,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 13 case distinctions, treesize of input 72 treesize of output 89 [2021-11-23 02:16:12,383 INFO L354 Elim1Store]: treesize reduction 336, result has 0.3 percent of original size [2021-11-23 02:16:12,383 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 110 treesize of output 38 [2021-11-23 02:16:12,486 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 89 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:16:12,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:16:12,885 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 89 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:16:12,886 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:16:12,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1219551621] [2021-11-23 02:16:12,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1219551621] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:16:12,886 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:16:12,886 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-23 02:16:12,886 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153094057] [2021-11-23 02:16:12,886 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:16:12,892 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:16:12,892 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:16:12,893 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:16:12,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:16:12,893 INFO L87 Difference]: Start difference. First operand 1127 states and 1743 transitions. Second operand has 7 states, 7 states have (on average 20.857142857142858) internal successors, (146), 7 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:16:14,917 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:16:20,737 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.21s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:16:24,660 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.57s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:16:27,407 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.80s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:16:28,506 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.10s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:16:31,633 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.12s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:16:44,319 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.60s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:16:44,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:16:44,724 INFO L93 Difference]: Finished difference Result 2731 states and 4183 transitions. [2021-11-23 02:16:44,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:16:44,725 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 20.857142857142858) internal successors, (146), 7 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 121 [2021-11-23 02:16:44,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:16:44,732 INFO L225 Difference]: With dead ends: 2731 [2021-11-23 02:16:44,732 INFO L226 Difference]: Without dead ends: 1625 [2021-11-23 02:16:44,734 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 234 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:16:44,734 INFO L933 BasicCegarLoop]: 160 mSDtfsCounter, 246 mSDsluCounter, 546 mSDsCounter, 0 mSdLazyCounter, 507 mSolverCounterSat, 75 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 30.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 706 SdHoareTripleChecker+Invalid, 583 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 507 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 31.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:16:44,735 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [246 Valid, 706 Invalid, 583 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 507 Invalid, 1 Unknown, 0 Unchecked, 31.7s Time] [2021-11-23 02:16:44,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1625 states. [2021-11-23 02:16:44,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1625 to 1127. [2021-11-23 02:16:44,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1127 states, 1126 states have (on average 1.5426287744227354) internal successors, (1737), 1126 states have internal predecessors, (1737), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:16:44,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1127 states to 1127 states and 1737 transitions. [2021-11-23 02:16:44,791 INFO L78 Accepts]: Start accepts. Automaton has 1127 states and 1737 transitions. Word has length 121 [2021-11-23 02:16:44,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:16:44,792 INFO L470 AbstractCegarLoop]: Abstraction has 1127 states and 1737 transitions. [2021-11-23 02:16:44,792 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 20.857142857142858) internal successors, (146), 7 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:16:44,792 INFO L276 IsEmpty]: Start isEmpty. Operand 1127 states and 1737 transitions. [2021-11-23 02:16:44,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-23 02:16:44,795 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:16:44,795 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, 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] [2021-11-23 02:16:44,813 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 02:16:45,013 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:16:45,013 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:16:45,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:16:45,014 INFO L85 PathProgramCache]: Analyzing trace with hash -1206993117, now seen corresponding path program 1 times [2021-11-23 02:16:45,015 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:16:45,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [980796016] [2021-11-23 02:16:45,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:45,015 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:16:45,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:16:45,016 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:16:45,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 02:16:45,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:45,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:16:45,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:16:45,606 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 02:16:45,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:16:45,921 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 02:16:45,921 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:16:45,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [980796016] [2021-11-23 02:16:45,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [980796016] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:16:45,921 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:16:45,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-23 02:16:45,921 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394594377] [2021-11-23 02:16:45,921 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:16:45,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:16:45,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:16:45,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:16:45,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:16:45,923 INFO L87 Difference]: Start difference. First operand 1127 states and 1737 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:16:46,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:16:46,520 INFO L93 Difference]: Finished difference Result 2260 states and 3487 transitions. [2021-11-23 02:16:46,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:16:46,521 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 128 [2021-11-23 02:16:46,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:16:46,527 INFO L225 Difference]: With dead ends: 2260 [2021-11-23 02:16:46,527 INFO L226 Difference]: Without dead ends: 1154 [2021-11-23 02:16:46,529 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 253 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:16:46,530 INFO L933 BasicCegarLoop]: 242 mSDtfsCounter, 15 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 430 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:16:46,530 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 430 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:16:46,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1154 states. [2021-11-23 02:16:46,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1154 to 1154. [2021-11-23 02:16:46,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1154 states, 1153 states have (on average 1.5368603642671292) internal successors, (1772), 1153 states have internal predecessors, (1772), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:16:46,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1154 states to 1154 states and 1772 transitions. [2021-11-23 02:16:46,584 INFO L78 Accepts]: Start accepts. Automaton has 1154 states and 1772 transitions. Word has length 128 [2021-11-23 02:16:46,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:16:46,585 INFO L470 AbstractCegarLoop]: Abstraction has 1154 states and 1772 transitions. [2021-11-23 02:16:46,585 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:16:46,585 INFO L276 IsEmpty]: Start isEmpty. Operand 1154 states and 1772 transitions. [2021-11-23 02:16:46,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-23 02:16:46,588 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:16:46,588 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, 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] [2021-11-23 02:16:46,603 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 02:16:46,803 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:16:46,804 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:16:46,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:16:46,804 INFO L85 PathProgramCache]: Analyzing trace with hash 946113701, now seen corresponding path program 1 times [2021-11-23 02:16:46,805 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:16:46,805 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2116380824] [2021-11-23 02:16:46,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:46,805 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:16:46,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:16:46,806 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:16:46,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 02:16:47,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:47,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:16:47,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:16:47,303 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 33 proven. 0 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2021-11-23 02:16:47,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:16:47,598 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 33 proven. 0 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2021-11-23 02:16:47,598 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:16:47,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2116380824] [2021-11-23 02:16:47,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2116380824] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:16:47,599 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:16:47,599 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-23 02:16:47,599 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899560607] [2021-11-23 02:16:47,599 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:16:47,599 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:16:47,600 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:16:47,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:16:47,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:16:47,600 INFO L87 Difference]: Start difference. First operand 1154 states and 1772 transitions. Second operand has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 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) [2021-11-23 02:16:47,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:16:47,708 INFO L93 Difference]: Finished difference Result 2289 states and 3523 transitions. [2021-11-23 02:16:47,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:16:47,711 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 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 128 [2021-11-23 02:16:47,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:16:47,715 INFO L225 Difference]: With dead ends: 2289 [2021-11-23 02:16:47,715 INFO L226 Difference]: Without dead ends: 1156 [2021-11-23 02:16:47,717 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 253 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:16:47,717 INFO L933 BasicCegarLoop]: 230 mSDtfsCounter, 4 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 409 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:16:47,718 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 409 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:16:47,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1156 states. [2021-11-23 02:16:47,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1156 to 1156. [2021-11-23 02:16:47,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1156 states, 1155 states have (on average 1.535930735930736) internal successors, (1774), 1155 states have internal predecessors, (1774), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:16:47,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1156 states to 1156 states and 1774 transitions. [2021-11-23 02:16:47,773 INFO L78 Accepts]: Start accepts. Automaton has 1156 states and 1774 transitions. Word has length 128 [2021-11-23 02:16:47,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:16:47,773 INFO L470 AbstractCegarLoop]: Abstraction has 1156 states and 1774 transitions. [2021-11-23 02:16:47,773 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 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) [2021-11-23 02:16:47,773 INFO L276 IsEmpty]: Start isEmpty. Operand 1156 states and 1774 transitions. [2021-11-23 02:16:47,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-23 02:16:47,776 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:16:47,776 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, 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] [2021-11-23 02:16:47,799 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 02:16:48,000 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:16:48,000 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:16:48,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:16:48,001 INFO L85 PathProgramCache]: Analyzing trace with hash 2135350117, now seen corresponding path program 1 times [2021-11-23 02:16:48,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:16:48,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [501994212] [2021-11-23 02:16:48,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:48,002 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:16:48,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:16:48,002 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:16:48,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 02:16:48,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:48,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:16:48,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:16:48,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:16:48,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:16:48,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:16:48,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:16:48,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:16:48,536 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:16:48,611 INFO L354 Elim1Store]: treesize reduction 188, result has 13.8 percent of original size [2021-11-23 02:16:48,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 40 [2021-11-23 02:16:48,666 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:16:48,667 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:16:48,667 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:16:48,975 INFO L354 Elim1Store]: treesize reduction 850, result has 7.0 percent of original size [2021-11-23 02:16:48,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 13 case distinctions, treesize of input 72 treesize of output 89 [2021-11-23 02:16:50,981 INFO L354 Elim1Store]: treesize reduction 336, result has 0.3 percent of original size [2021-11-23 02:16:50,981 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 110 treesize of output 38 [2021-11-23 02:16:51,101 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 90 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:16:51,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:16:52,073 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 90 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:16:52,073 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:16:52,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [501994212] [2021-11-23 02:16:52,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [501994212] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:16:52,073 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:16:52,073 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 5 [2021-11-23 02:16:52,073 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365903773] [2021-11-23 02:16:52,073 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:16:52,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:16:52,074 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:16:52,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:16:52,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:16:52,074 INFO L87 Difference]: Start difference. First operand 1156 states and 1774 transitions. Second operand has 5 states, 5 states have (on average 31.4) internal successors, (157), 5 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:16:54,090 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:02,364 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:03,557 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.19s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:07,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:17:07,728 INFO L93 Difference]: Finished difference Result 2521 states and 3862 transitions. [2021-11-23 02:17:07,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:17:07,730 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 31.4) internal successors, (157), 5 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 131 [2021-11-23 02:17:07,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:17:07,735 INFO L225 Difference]: With dead ends: 2521 [2021-11-23 02:17:07,735 INFO L226 Difference]: Without dead ends: 1388 [2021-11-23 02:17:07,737 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 254 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:17:07,743 INFO L933 BasicCegarLoop]: 213 mSDtfsCounter, 120 mSDsluCounter, 342 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 10 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 555 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:17:07,743 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [120 Valid, 555 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 228 Invalid, 2 Unknown, 0 Unchecked, 15.6s Time] [2021-11-23 02:17:07,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1388 states. [2021-11-23 02:17:07,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1388 to 1283. [2021-11-23 02:17:07,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1283 states, 1282 states have (on average 1.534321372854914) internal successors, (1967), 1282 states have internal predecessors, (1967), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:17:07,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1283 states to 1283 states and 1967 transitions. [2021-11-23 02:17:07,800 INFO L78 Accepts]: Start accepts. Automaton has 1283 states and 1967 transitions. Word has length 131 [2021-11-23 02:17:07,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:17:07,801 INFO L470 AbstractCegarLoop]: Abstraction has 1283 states and 1967 transitions. [2021-11-23 02:17:07,801 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 31.4) internal successors, (157), 5 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:17:07,801 INFO L276 IsEmpty]: Start isEmpty. Operand 1283 states and 1967 transitions. [2021-11-23 02:17:07,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-23 02:17:07,804 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:17:07,804 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, 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] [2021-11-23 02:17:07,827 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 02:17:08,022 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:17:08,022 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:17:08,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:17:08,022 INFO L85 PathProgramCache]: Analyzing trace with hash 1140656419, now seen corresponding path program 1 times [2021-11-23 02:17:08,023 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:17:08,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [433045770] [2021-11-23 02:17:08,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:17:08,023 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:17:08,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:17:08,024 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:17:08,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 02:17:08,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:17:08,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:17:08,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:17:08,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:17:08,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:17:08,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:17:08,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:17:08,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:17:08,738 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:17:08,825 INFO L354 Elim1Store]: treesize reduction 190, result has 12.8 percent of original size [2021-11-23 02:17:08,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 38 [2021-11-23 02:17:08,898 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:17:08,899 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:17:08,899 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:17:09,184 INFO L354 Elim1Store]: treesize reduction 850, result has 7.0 percent of original size [2021-11-23 02:17:09,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 13 case distinctions, treesize of input 70 treesize of output 87 [2021-11-23 02:17:10,257 INFO L354 Elim1Store]: treesize reduction 336, result has 0.3 percent of original size [2021-11-23 02:17:10,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 108 treesize of output 36 [2021-11-23 02:17:10,403 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 75 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 02:17:10,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:17:11,136 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 75 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 02:17:11,136 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:17:11,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [433045770] [2021-11-23 02:17:11,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [433045770] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:17:11,136 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:17:11,136 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 5 [2021-11-23 02:17:11,136 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917161689] [2021-11-23 02:17:11,136 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:17:11,137 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:17:11,137 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:17:11,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:17:11,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:17:11,137 INFO L87 Difference]: Start difference. First operand 1283 states and 1967 transitions. Second operand has 5 states, 5 states have (on average 25.2) internal successors, (126), 5 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:17:13,154 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:17,493 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.19s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:19,589 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.39s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:21,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:17:21,455 INFO L93 Difference]: Finished difference Result 2654 states and 4064 transitions. [2021-11-23 02:17:21,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:17:21,457 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 25.2) internal successors, (126), 5 states have internal predecessors, (126), 0 states have call successors, (0), 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 131 [2021-11-23 02:17:21,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:17:21,462 INFO L225 Difference]: With dead ends: 2654 [2021-11-23 02:17:21,463 INFO L226 Difference]: Without dead ends: 1394 [2021-11-23 02:17:21,464 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 254 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:17:21,464 INFO L933 BasicCegarLoop]: 256 mSDtfsCounter, 54 mSDsluCounter, 383 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 639 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:17:21,465 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 639 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 161 Invalid, 1 Unknown, 0 Unchecked, 10.2s Time] [2021-11-23 02:17:21,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1394 states. [2021-11-23 02:17:21,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1394 to 1355. [2021-11-23 02:17:21,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1355 states, 1354 states have (on average 1.5280649926144756) internal successors, (2069), 1354 states have internal predecessors, (2069), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:17:21,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1355 states to 1355 states and 2069 transitions. [2021-11-23 02:17:21,528 INFO L78 Accepts]: Start accepts. Automaton has 1355 states and 2069 transitions. Word has length 131 [2021-11-23 02:17:21,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:17:21,528 INFO L470 AbstractCegarLoop]: Abstraction has 1355 states and 2069 transitions. [2021-11-23 02:17:21,528 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 25.2) internal successors, (126), 5 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:17:21,528 INFO L276 IsEmpty]: Start isEmpty. Operand 1355 states and 2069 transitions. [2021-11-23 02:17:21,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-23 02:17:21,531 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:17:21,532 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:17:21,553 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (25)] Ended with exit code 0 [2021-11-23 02:17:21,746 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:17:21,746 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:17:21,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:17:21,746 INFO L85 PathProgramCache]: Analyzing trace with hash 499824474, now seen corresponding path program 1 times [2021-11-23 02:17:21,747 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:17:21,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2140001538] [2021-11-23 02:17:21,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:17:21,747 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:17:21,747 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:17:21,748 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:17:21,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 02:17:22,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:17:22,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:17:22,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:17:22,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:17:22,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:17:22,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:17:22,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:17:22,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:17:22,394 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:17:22,470 INFO L354 Elim1Store]: treesize reduction 188, result has 13.8 percent of original size [2021-11-23 02:17:22,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 40 [2021-11-23 02:17:22,525 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:17:22,526 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:17:22,526 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:17:22,827 INFO L354 Elim1Store]: treesize reduction 850, result has 7.0 percent of original size [2021-11-23 02:17:22,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 13 case distinctions, treesize of input 72 treesize of output 89 [2021-11-23 02:17:24,245 INFO L354 Elim1Store]: treesize reduction 336, result has 0.3 percent of original size [2021-11-23 02:17:24,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 110 treesize of output 38 [2021-11-23 02:17:24,399 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 134 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-23 02:17:24,399 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:17:24,816 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 134 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-23 02:17:24,816 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:17:24,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2140001538] [2021-11-23 02:17:24,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2140001538] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:17:24,816 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:17:24,816 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-23 02:17:24,816 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728304393] [2021-11-23 02:17:24,816 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:17:24,817 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:17:24,817 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:17:24,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:17:24,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:17:24,817 INFO L87 Difference]: Start difference. First operand 1355 states and 2069 transitions. Second operand has 7 states, 7 states have (on average 18.857142857142858) internal successors, (132), 7 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) [2021-11-23 02:17:26,837 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:28,848 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:36,407 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.65s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:37,833 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.43s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:41,122 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.31s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:52,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:17:52,706 INFO L93 Difference]: Finished difference Result 3153 states and 4781 transitions. [2021-11-23 02:17:52,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:17:52,707 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 18.857142857142858) internal successors, (132), 7 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 141 [2021-11-23 02:17:52,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:17:52,717 INFO L225 Difference]: With dead ends: 3153 [2021-11-23 02:17:52,717 INFO L226 Difference]: Without dead ends: 1821 [2021-11-23 02:17:52,719 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 274 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:17:52,719 INFO L933 BasicCegarLoop]: 186 mSDtfsCounter, 307 mSDsluCounter, 456 mSDsCounter, 0 mSdLazyCounter, 416 mSolverCounterSat, 67 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 27.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 307 SdHoareTripleChecker+Valid, 642 SdHoareTripleChecker+Invalid, 485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 416 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:17:52,720 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [307 Valid, 642 Invalid, 485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 416 Invalid, 2 Unknown, 0 Unchecked, 27.7s Time] [2021-11-23 02:17:52,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1821 states. [2021-11-23 02:17:52,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1821 to 1445. [2021-11-23 02:17:52,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1445 states, 1444 states have (on average 1.5186980609418284) internal successors, (2193), 1444 states have internal predecessors, (2193), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:17:52,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1445 states to 1445 states and 2193 transitions. [2021-11-23 02:17:52,784 INFO L78 Accepts]: Start accepts. Automaton has 1445 states and 2193 transitions. Word has length 141 [2021-11-23 02:17:52,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:17:52,784 INFO L470 AbstractCegarLoop]: Abstraction has 1445 states and 2193 transitions. [2021-11-23 02:17:52,784 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 18.857142857142858) internal successors, (132), 7 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) [2021-11-23 02:17:52,785 INFO L276 IsEmpty]: Start isEmpty. Operand 1445 states and 2193 transitions. [2021-11-23 02:17:52,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-23 02:17:52,788 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:17:52,788 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:17:52,813 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-23 02:17:53,002 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:17:53,002 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:17:53,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:17:53,002 INFO L85 PathProgramCache]: Analyzing trace with hash 1754593456, now seen corresponding path program 1 times [2021-11-23 02:17:53,003 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:17:53,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1786319240] [2021-11-23 02:17:53,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:17:53,003 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:17:53,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:17:53,004 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:17:53,066 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 02:17:53,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:17:53,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:17:53,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:17:53,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:17:53,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:17:53,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:17:53,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:17:53,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:17:53,951 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:17:54,029 INFO L354 Elim1Store]: treesize reduction 188, result has 13.8 percent of original size [2021-11-23 02:17:54,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 40 [2021-11-23 02:17:54,087 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:17:54,087 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:17:54,088 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:17:54,381 INFO L354 Elim1Store]: treesize reduction 850, result has 7.0 percent of original size [2021-11-23 02:17:54,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 13 case distinctions, treesize of input 72 treesize of output 89 [2021-11-23 02:17:56,041 INFO L354 Elim1Store]: treesize reduction 336, result has 0.3 percent of original size [2021-11-23 02:17:56,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 110 treesize of output 38 [2021-11-23 02:17:56,198 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 136 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-23 02:17:56,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:17:56,622 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 136 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-23 02:17:56,623 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:17:56,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1786319240] [2021-11-23 02:17:56,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1786319240] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:17:56,623 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:17:56,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-23 02:17:56,623 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193458297] [2021-11-23 02:17:56,623 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:17:56,623 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:17:56,624 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:17:56,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:17:56,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:17:56,624 INFO L87 Difference]: Start difference. First operand 1445 states and 2193 transitions. Second operand has 7 states, 7 states have (on average 19.142857142857142) internal successors, (134), 7 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) [2021-11-23 02:17:58,648 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:18:07,984 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.19s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:18:11,454 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:18:21,611 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.55s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:18:27,868 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:18:28,879 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:18:30,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:30,251 INFO L93 Difference]: Finished difference Result 3327 states and 5023 transitions. [2021-11-23 02:18:30,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:18:30,252 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 19.142857142857142) internal successors, (134), 7 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 142 [2021-11-23 02:18:30,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:30,259 INFO L225 Difference]: With dead ends: 3327 [2021-11-23 02:18:30,260 INFO L226 Difference]: Without dead ends: 1905 [2021-11-23 02:18:30,261 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 276 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:18:30,261 INFO L933 BasicCegarLoop]: 191 mSDtfsCounter, 234 mSDsluCounter, 613 mSDsCounter, 0 mSdLazyCounter, 527 mSolverCounterSat, 69 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 32.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 804 SdHoareTripleChecker+Invalid, 598 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 527 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 33.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:30,261 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [234 Valid, 804 Invalid, 598 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 527 Invalid, 2 Unknown, 0 Unchecked, 33.5s Time] [2021-11-23 02:18:30,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1905 states. [2021-11-23 02:18:30,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1905 to 1538. [2021-11-23 02:18:30,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1538 states, 1537 states have (on average 1.509433962264151) internal successors, (2320), 1537 states have internal predecessors, (2320), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:30,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1538 states to 1538 states and 2320 transitions. [2021-11-23 02:18:30,335 INFO L78 Accepts]: Start accepts. Automaton has 1538 states and 2320 transitions. Word has length 142 [2021-11-23 02:18:30,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:30,336 INFO L470 AbstractCegarLoop]: Abstraction has 1538 states and 2320 transitions. [2021-11-23 02:18:30,336 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 19.142857142857142) internal successors, (134), 7 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) [2021-11-23 02:18:30,336 INFO L276 IsEmpty]: Start isEmpty. Operand 1538 states and 2320 transitions. [2021-11-23 02:18:30,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-23 02:18:30,340 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:30,340 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:18:30,364 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 02:18:30,560 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:18:30,561 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:30,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:30,561 INFO L85 PathProgramCache]: Analyzing trace with hash 1578965143, now seen corresponding path program 1 times [2021-11-23 02:18:30,562 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:18:30,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [320788923] [2021-11-23 02:18:30,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:30,562 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:18:30,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:18:30,564 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:18:30,569 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_89925ffd-3ae9-45f7-be0f-188db40ba8c8/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 02:18:31,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:31,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:18:31,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:31,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:31,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:31,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:31,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:31,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:31,348 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:18:31,427 INFO L354 Elim1Store]: treesize reduction 188, result has 13.8 percent of original size [2021-11-23 02:18:31,427 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 40 [2021-11-23 02:18:31,487 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:18:31,488 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:18:31,488 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:18:31,801 INFO L354 Elim1Store]: treesize reduction 850, result has 7.0 percent of original size [2021-11-23 02:18:31,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 13 case distinctions, treesize of input 72 treesize of output 89 [2021-11-23 02:18:33,135 INFO L354 Elim1Store]: treesize reduction 336, result has 0.3 percent of original size [2021-11-23 02:18:33,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 110 treesize of output 38 [2021-11-23 02:18:33,327 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 130 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-23 02:18:33,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:18:33,814 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 130 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-23 02:18:33,814 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:18:33,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [320788923] [2021-11-23 02:18:33,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [320788923] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:18:33,814 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:18:33,815 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 7 [2021-11-23 02:18:33,815 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145233222] [2021-11-23 02:18:33,815 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:18:33,815 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:18:33,815 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:18:33,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:18:33,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:18:33,816 INFO L87 Difference]: Start difference. First operand 1538 states and 2320 transitions. Second operand has 7 states, 7 states have (on average 19.142857142857142) internal successors, (134), 7 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) [2021-11-23 02:18:35,841 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:18:37,848 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers []