./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/openssl/s3_srvr.blast.16.i.cil-2.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_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/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_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/openssl/s3_srvr.blast.16.i.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/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_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/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 85b77735b82f790dcf6393a6fb65098490b7c65f26539a1354e286eeb25926e8 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:46:01,410 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:46:01,413 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:46:01,466 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:46:01,467 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:46:01,473 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:46:01,475 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:46:01,480 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:46:01,482 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:46:01,490 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:46:01,492 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:46:01,494 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:46:01,494 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:46:01,497 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:46:01,499 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:46:01,506 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:46:01,508 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:46:01,509 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:46:01,512 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:46:01,519 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:46:01,521 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:46:01,524 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:46:01,528 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:46:01,529 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:46:01,536 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:46:01,536 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:46:01,537 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:46:01,539 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:46:01,540 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:46:01,541 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:46:01,543 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:46:01,544 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:46:01,546 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:46:01,547 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:46:01,549 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:46:01,549 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:46:01,550 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:46:01,550 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:46:01,550 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:46:01,551 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:46:01,552 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:46:01,553 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:46:01,608 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:46:01,610 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:46:01,611 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:46:01,611 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:46:01,618 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:46:01,618 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:46:01,619 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:46:01,619 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:46:01,619 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:46:01,619 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:46:01,620 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:46:01,621 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:46:01,621 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:46:01,621 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:46:01,622 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:46:01,622 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:46:01,622 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:46:01,622 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:46:01,623 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:46:01,623 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:46:01,623 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:46:01,624 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:46:01,624 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:46:01,624 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:46:01,624 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:46:01,625 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:46:01,626 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:46:01,626 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:46:01,627 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:46:01,627 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:46:01,627 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:46:01,628 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:46:01,628 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:46:01,628 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:46:01,628 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:46:01,629 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:46:01,629 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:46:01,629 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:46:01,629 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:46:01,629 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:46:01,630 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:46:01,630 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_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 85b77735b82f790dcf6393a6fb65098490b7c65f26539a1354e286eeb25926e8 [2021-11-23 02:46:01,945 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:46:01,968 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:46:01,971 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:46:01,973 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:46:01,974 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:46:01,975 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/openssl/s3_srvr.blast.16.i.cil-2.c [2021-11-23 02:46:02,072 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/data/29479e103/770fa83521f1440c97b4544e2cef0bf3/FLAGf27d01543 [2021-11-23 02:46:02,849 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:46:02,850 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/sv-benchmarks/c/openssl/s3_srvr.blast.16.i.cil-2.c [2021-11-23 02:46:02,886 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/data/29479e103/770fa83521f1440c97b4544e2cef0bf3/FLAGf27d01543 [2021-11-23 02:46:03,034 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/data/29479e103/770fa83521f1440c97b4544e2cef0bf3 [2021-11-23 02:46:03,037 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:46:03,039 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:46:03,041 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:46:03,041 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:46:03,045 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:46:03,046 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:46:03" (1/1) ... [2021-11-23 02:46:03,047 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17089bf9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:03, skipping insertion in model container [2021-11-23 02:46:03,048 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:46:03" (1/1) ... [2021-11-23 02:46:03,055 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:46:03,119 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:46:03,630 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_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/sv-benchmarks/c/openssl/s3_srvr.blast.16.i.cil-2.c[77660,77673] [2021-11-23 02:46:03,640 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:46:03,655 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:46:03,860 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_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/sv-benchmarks/c/openssl/s3_srvr.blast.16.i.cil-2.c[77660,77673] [2021-11-23 02:46:03,869 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:46:03,894 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:46:03,894 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:03 WrapperNode [2021-11-23 02:46:03,894 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:46:03,896 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:46:03,896 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:46:03,896 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:46:03,904 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:03" (1/1) ... [2021-11-23 02:46:03,949 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:03" (1/1) ... [2021-11-23 02:46:04,001 INFO L137 Inliner]: procedures = 31, calls = 223, calls flagged for inlining = 7, calls inlined = 3, statements flattened = 810 [2021-11-23 02:46:04,001 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:46:04,002 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:46:04,002 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:46:04,003 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:46:04,011 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:03" (1/1) ... [2021-11-23 02:46:04,012 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:03" (1/1) ... [2021-11-23 02:46:04,023 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:03" (1/1) ... [2021-11-23 02:46:04,024 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:03" (1/1) ... [2021-11-23 02:46:04,099 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:03" (1/1) ... [2021-11-23 02:46:04,111 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:03" (1/1) ... [2021-11-23 02:46:04,127 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:03" (1/1) ... [2021-11-23 02:46:04,145 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:46:04,146 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:46:04,146 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:46:04,147 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:46:04,153 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:03" (1/1) ... [2021-11-23 02:46:04,162 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:46:04,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:46:04,190 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:46:04,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:46:04,245 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:46:04,245 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 02:46:04,246 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 02:46:04,246 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 02:46:04,246 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 02:46:04,246 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:46:04,246 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 02:46:04,247 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:46:04,247 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:46:04,482 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:46:04,484 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:46:04,503 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 02:46:07,658 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##90: assume false; [2021-11-23 02:46:07,659 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##91: assume !false; [2021-11-23 02:46:07,659 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:46:08,033 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:46:08,033 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 02:46:08,036 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:46:08 BoogieIcfgContainer [2021-11-23 02:46:08,037 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:46:08,038 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:46:08,039 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:46:08,042 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:46:08,042 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:46:03" (1/3) ... [2021-11-23 02:46:08,043 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15883377 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:46:08, skipping insertion in model container [2021-11-23 02:46:08,043 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:03" (2/3) ... [2021-11-23 02:46:08,043 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15883377 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:46:08, skipping insertion in model container [2021-11-23 02:46:08,044 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:46:08" (3/3) ... [2021-11-23 02:46:08,045 INFO L111 eAbstractionObserver]: Analyzing ICFG s3_srvr.blast.16.i.cil-2.c [2021-11-23 02:46:08,052 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:46:08,052 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:46:08,121 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:46:08,137 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 02:46:08,139 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:46:08,164 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 02:46:08,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-23 02:46:08,177 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:08,178 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 02:46:08,178 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:08,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:08,186 INFO L85 PathProgramCache]: Analyzing trace with hash -1114655405, now seen corresponding path program 1 times [2021-11-23 02:46:08,211 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:08,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1882034153] [2021-11-23 02:46:08,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:08,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:08,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:08,595 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 02:46:08,596 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:08,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1882034153] [2021-11-23 02:46:08,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1882034153] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:08,597 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:08,598 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:46:08,599 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688003147] [2021-11-23 02:46:08,600 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:08,605 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:08,605 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:08,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:08,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:08,639 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 02:46:10,665 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 02:46:11,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:11,300 INFO L93 Difference]: Finished difference Result 245 states and 424 transitions. [2021-11-23 02:46:11,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:11,304 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 02:46:11,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:11,316 INFO L225 Difference]: With dead ends: 245 [2021-11-23 02:46:11,316 INFO L226 Difference]: Without dead ends: 130 [2021-11-23 02:46:11,319 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 02:46:11,323 INFO L933 BasicCegarLoop]: 148 mSDtfsCounter, 20 mSDsluCounter, 272 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s 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, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:11,324 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 391 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 174 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2021-11-23 02:46:11,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-23 02:46:11,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 118. [2021-11-23 02:46:11,369 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 02:46:11,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 181 transitions. [2021-11-23 02:46:11,373 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 181 transitions. Word has length 38 [2021-11-23 02:46:11,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:11,376 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 181 transitions. [2021-11-23 02:46:11,376 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 02:46:11,376 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 181 transitions. [2021-11-23 02:46:11,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 02:46:11,379 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:11,379 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 02:46:11,379 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:46:11,380 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:11,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:11,381 INFO L85 PathProgramCache]: Analyzing trace with hash -619989851, now seen corresponding path program 1 times [2021-11-23 02:46:11,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:11,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684480462] [2021-11-23 02:46:11,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:11,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:11,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:11,606 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 02:46:11,607 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:11,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [684480462] [2021-11-23 02:46:11,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [684480462] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:11,609 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:11,609 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:46:11,610 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731702576] [2021-11-23 02:46:11,610 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:11,612 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:11,612 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:11,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:11,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:11,615 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 02:46:13,633 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 02:46:14,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:14,065 INFO L93 Difference]: Finished difference Result 236 states and 356 transitions. [2021-11-23 02:46:14,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:14,067 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 02:46:14,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:14,068 INFO L225 Difference]: With dead ends: 236 [2021-11-23 02:46:14,068 INFO L226 Difference]: Without dead ends: 130 [2021-11-23 02:46:14,069 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 02:46:14,071 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 02:46:14,072 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 02:46:14,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-23 02:46:14,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 118. [2021-11-23 02:46:14,083 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 02:46:14,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 180 transitions. [2021-11-23 02:46:14,084 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 180 transitions. Word has length 48 [2021-11-23 02:46:14,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:14,085 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 180 transitions. [2021-11-23 02:46:14,085 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 02:46:14,085 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 180 transitions. [2021-11-23 02:46:14,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 02:46:14,087 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:14,087 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 02:46:14,087 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:46:14,088 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:14,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:14,088 INFO L85 PathProgramCache]: Analyzing trace with hash 1779140371, now seen corresponding path program 1 times [2021-11-23 02:46:14,089 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:14,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583239583] [2021-11-23 02:46:14,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:14,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:14,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:14,169 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 02:46:14,170 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:14,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [583239583] [2021-11-23 02:46:14,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [583239583] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:14,170 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:14,171 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:46:14,171 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96549579] [2021-11-23 02:46:14,171 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:14,171 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:14,172 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:14,172 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:14,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:14,173 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 02:46:16,185 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 02:46:16,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:16,588 INFO L93 Difference]: Finished difference Result 236 states and 355 transitions. [2021-11-23 02:46:16,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:16,590 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 02:46:16,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:16,592 INFO L225 Difference]: With dead ends: 236 [2021-11-23 02:46:16,592 INFO L226 Difference]: Without dead ends: 130 [2021-11-23 02:46:16,593 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 02:46:16,595 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 02:46:16,595 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 02:46:16,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-23 02:46:16,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 118. [2021-11-23 02:46:16,605 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 02:46:16,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 179 transitions. [2021-11-23 02:46:16,607 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 179 transitions. Word has length 49 [2021-11-23 02:46:16,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:16,607 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 179 transitions. [2021-11-23 02:46:16,607 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 02:46:16,608 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 179 transitions. [2021-11-23 02:46:16,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 02:46:16,610 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:16,610 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 02:46:16,610 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:46:16,611 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:16,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:16,612 INFO L85 PathProgramCache]: Analyzing trace with hash 2102442947, now seen corresponding path program 1 times [2021-11-23 02:46:16,612 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:16,612 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099297701] [2021-11-23 02:46:16,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:16,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:16,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:16,703 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 02:46:16,703 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:16,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1099297701] [2021-11-23 02:46:16,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1099297701] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:16,704 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:16,704 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:46:16,704 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321592427] [2021-11-23 02:46:16,705 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:16,705 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:16,705 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:16,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:16,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:16,706 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 02:46:18,721 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 02:46:19,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:19,180 INFO L93 Difference]: Finished difference Result 236 states and 354 transitions. [2021-11-23 02:46:19,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:19,182 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 02:46:19,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:19,183 INFO L225 Difference]: With dead ends: 236 [2021-11-23 02:46:19,183 INFO L226 Difference]: Without dead ends: 130 [2021-11-23 02:46:19,184 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 02:46:19,186 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 15 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s 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, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:19,186 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 322 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 163 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:46:19,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-23 02:46:19,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 118. [2021-11-23 02:46:19,195 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 02:46:19,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 178 transitions. [2021-11-23 02:46:19,208 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 178 transitions. Word has length 50 [2021-11-23 02:46:19,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:19,209 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 178 transitions. [2021-11-23 02:46:19,209 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 02:46:19,209 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 178 transitions. [2021-11-23 02:46:19,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 02:46:19,214 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:19,214 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 02:46:19,214 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:46:19,214 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:19,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:19,215 INFO L85 PathProgramCache]: Analyzing trace with hash -762725368, now seen corresponding path program 1 times [2021-11-23 02:46:19,215 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:19,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [168654341] [2021-11-23 02:46:19,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:19,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:19,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:19,360 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 02:46:19,360 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:19,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [168654341] [2021-11-23 02:46:19,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [168654341] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:19,361 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:19,361 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:46:19,361 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713675926] [2021-11-23 02:46:19,362 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:19,362 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:19,362 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:19,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:19,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:19,363 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 02:46:21,376 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 02:46:21,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:21,755 INFO L93 Difference]: Finished difference Result 236 states and 353 transitions. [2021-11-23 02:46:21,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:21,757 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 02:46:21,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:21,758 INFO L225 Difference]: With dead ends: 236 [2021-11-23 02:46:21,758 INFO L226 Difference]: Without dead ends: 130 [2021-11-23 02:46:21,759 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 02:46:21,761 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, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:21,761 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 322 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 163 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:46:21,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-23 02:46:21,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 118. [2021-11-23 02:46:21,770 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 02:46:21,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 177 transitions. [2021-11-23 02:46:21,771 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 177 transitions. Word has length 50 [2021-11-23 02:46:21,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:21,772 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 177 transitions. [2021-11-23 02:46:21,772 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 02:46:21,772 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 177 transitions. [2021-11-23 02:46:21,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 02:46:21,774 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:21,774 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 02:46:21,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:46:21,775 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:21,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:21,776 INFO L85 PathProgramCache]: Analyzing trace with hash -2128500662, now seen corresponding path program 1 times [2021-11-23 02:46:21,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:21,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813674867] [2021-11-23 02:46:21,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:21,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:21,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:21,843 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 02:46:21,843 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:21,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [813674867] [2021-11-23 02:46:21,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [813674867] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:21,847 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:21,847 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:46:21,847 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773245393] [2021-11-23 02:46:21,847 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:21,848 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:21,848 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:21,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:21,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:21,849 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 02:46:23,865 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 02:46:24,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:24,239 INFO L93 Difference]: Finished difference Result 236 states and 352 transitions. [2021-11-23 02:46:24,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:24,241 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 02:46:24,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:24,242 INFO L225 Difference]: With dead ends: 236 [2021-11-23 02:46:24,242 INFO L226 Difference]: Without dead ends: 130 [2021-11-23 02:46:24,243 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 02:46:24,244 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, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:24,244 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 323 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 162 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:46:24,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-23 02:46:24,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 118. [2021-11-23 02:46:24,252 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 02:46:24,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 176 transitions. [2021-11-23 02:46:24,253 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 176 transitions. Word has length 50 [2021-11-23 02:46:24,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:24,253 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 176 transitions. [2021-11-23 02:46:24,253 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 02:46:24,254 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 176 transitions. [2021-11-23 02:46:24,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 02:46:24,255 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:24,255 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 02:46:24,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:46:24,260 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:24,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:24,262 INFO L85 PathProgramCache]: Analyzing trace with hash -1695667176, now seen corresponding path program 1 times [2021-11-23 02:46:24,262 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:24,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1488711886] [2021-11-23 02:46:24,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:24,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:24,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:24,350 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 02:46:24,350 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:24,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1488711886] [2021-11-23 02:46:24,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1488711886] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:24,351 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:24,351 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:46:24,351 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533122894] [2021-11-23 02:46:24,352 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:24,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:24,352 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:24,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:24,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:24,353 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 02:46:26,362 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 02:46:26,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:26,701 INFO L93 Difference]: Finished difference Result 234 states and 349 transitions. [2021-11-23 02:46:26,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:26,702 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 02:46:26,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:26,703 INFO L225 Difference]: With dead ends: 234 [2021-11-23 02:46:26,703 INFO L226 Difference]: Without dead ends: 128 [2021-11-23 02:46:26,704 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 02:46:26,705 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 9 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s 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 02:46:26,705 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 02:46:26,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-23 02:46:26,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 118. [2021-11-23 02:46:26,713 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 02:46:26,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 175 transitions. [2021-11-23 02:46:26,714 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 175 transitions. Word has length 51 [2021-11-23 02:46:26,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:26,714 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 175 transitions. [2021-11-23 02:46:26,715 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 02:46:26,715 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 175 transitions. [2021-11-23 02:46:26,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 02:46:26,716 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:26,716 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 02:46:26,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 02:46:26,717 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:26,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:26,717 INFO L85 PathProgramCache]: Analyzing trace with hash -673846888, now seen corresponding path program 1 times [2021-11-23 02:46:26,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:26,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [796407350] [2021-11-23 02:46:26,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:26,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:26,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:26,785 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 02:46:26,786 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:26,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [796407350] [2021-11-23 02:46:26,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [796407350] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:26,786 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:26,787 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:46:26,787 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633979710] [2021-11-23 02:46:26,787 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:26,788 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:26,788 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:26,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:26,789 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:26,789 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 02:46:28,801 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 02:46:29,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:29,207 INFO L93 Difference]: Finished difference Result 234 states and 348 transitions. [2021-11-23 02:46:29,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:29,210 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 02:46:29,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:29,212 INFO L225 Difference]: With dead ends: 234 [2021-11-23 02:46:29,212 INFO L226 Difference]: Without dead ends: 128 [2021-11-23 02:46:29,212 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 02:46:29,213 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, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:29,213 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 326 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 159 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:46:29,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-23 02:46:29,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 118. [2021-11-23 02:46:29,231 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 02:46:29,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 174 transitions. [2021-11-23 02:46:29,232 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 174 transitions. Word has length 51 [2021-11-23 02:46:29,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:29,245 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 174 transitions. [2021-11-23 02:46:29,246 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 02:46:29,246 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 174 transitions. [2021-11-23 02:46:29,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 02:46:29,246 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:29,247 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 02:46:29,247 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 02:46:29,247 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:29,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:29,257 INFO L85 PathProgramCache]: Analyzing trace with hash -753253656, now seen corresponding path program 1 times [2021-11-23 02:46:29,257 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:29,257 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [809900200] [2021-11-23 02:46:29,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:29,258 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:29,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:29,357 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 02:46:29,357 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:29,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [809900200] [2021-11-23 02:46:29,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [809900200] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:29,358 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:29,358 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:46:29,358 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918641804] [2021-11-23 02:46:29,358 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:29,359 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:29,359 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:29,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:29,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:29,360 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 02:46:31,372 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 02:46:31,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:31,720 INFO L93 Difference]: Finished difference Result 226 states and 337 transitions. [2021-11-23 02:46:31,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:31,723 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 02:46:31,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:31,723 INFO L225 Difference]: With dead ends: 226 [2021-11-23 02:46:31,724 INFO L226 Difference]: Without dead ends: 120 [2021-11-23 02:46:31,724 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:46:31,725 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 5 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s 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 02:46:31,725 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 02:46:31,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-23 02:46:31,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 118. [2021-11-23 02:46:31,733 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 02:46:31,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 173 transitions. [2021-11-23 02:46:31,734 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 173 transitions. Word has length 52 [2021-11-23 02:46:31,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:31,735 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 173 transitions. [2021-11-23 02:46:31,735 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 02:46:31,735 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 173 transitions. [2021-11-23 02:46:31,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 02:46:31,736 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:31,736 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 02:46:31,736 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 02:46:31,737 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:31,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:31,737 INFO L85 PathProgramCache]: Analyzing trace with hash 210119897, now seen corresponding path program 1 times [2021-11-23 02:46:31,738 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:31,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [69563395] [2021-11-23 02:46:31,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:31,738 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:31,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:31,831 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 02:46:31,831 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:31,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [69563395] [2021-11-23 02:46:31,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [69563395] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:31,832 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:31,832 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:46:31,832 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221994646] [2021-11-23 02:46:31,833 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:31,833 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:31,833 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:31,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:31,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:31,834 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 02:46:33,847 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 02:46:34,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:34,191 INFO L93 Difference]: Finished difference Result 258 states and 385 transitions. [2021-11-23 02:46:34,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:34,192 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 02:46:34,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:34,195 INFO L225 Difference]: With dead ends: 258 [2021-11-23 02:46:34,195 INFO L226 Difference]: Without dead ends: 152 [2021-11-23 02:46:34,195 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 02:46:34,196 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 02:46:34,197 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 02:46:34,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-23 02:46:34,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 138. [2021-11-23 02:46:34,203 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 02:46:34,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 207 transitions. [2021-11-23 02:46:34,204 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 207 transitions. Word has length 53 [2021-11-23 02:46:34,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:34,205 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 207 transitions. [2021-11-23 02:46:34,205 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 02:46:34,205 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 207 transitions. [2021-11-23 02:46:34,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 02:46:34,206 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:34,206 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 02:46:34,206 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 02:46:34,206 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:34,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:34,207 INFO L85 PathProgramCache]: Analyzing trace with hash -1387332437, now seen corresponding path program 1 times [2021-11-23 02:46:34,207 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:34,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432402090] [2021-11-23 02:46:34,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:34,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:34,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:34,277 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 02:46:34,278 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:34,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432402090] [2021-11-23 02:46:34,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1432402090] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:34,278 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:34,279 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:46:34,279 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244937082] [2021-11-23 02:46:34,279 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:34,280 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:34,280 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:34,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:34,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:34,281 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 02:46:36,294 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 02:46:36,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:36,587 INFO L93 Difference]: Finished difference Result 278 states and 418 transitions. [2021-11-23 02:46:36,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:36,588 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 02:46:36,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:36,589 INFO L225 Difference]: With dead ends: 278 [2021-11-23 02:46:36,589 INFO L226 Difference]: Without dead ends: 152 [2021-11-23 02:46:36,590 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 02:46:36,591 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 32 mSDsluCounter, 228 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s 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 02:46:36,591 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 02:46:36,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-23 02:46:36,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 138. [2021-11-23 02:46:36,597 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 02:46:36,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 206 transitions. [2021-11-23 02:46:36,598 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 206 transitions. Word has length 63 [2021-11-23 02:46:36,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:36,598 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 206 transitions. [2021-11-23 02:46:36,598 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 02:46:36,598 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 206 transitions. [2021-11-23 02:46:36,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 02:46:36,599 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:36,600 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 02:46:36,600 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-23 02:46:36,600 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:36,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:36,601 INFO L85 PathProgramCache]: Analyzing trace with hash -533643315, now seen corresponding path program 1 times [2021-11-23 02:46:36,601 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:36,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [859506020] [2021-11-23 02:46:36,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:36,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:36,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:36,709 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 02:46:36,710 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:36,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [859506020] [2021-11-23 02:46:36,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [859506020] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:36,710 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:36,710 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:46:36,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738281196] [2021-11-23 02:46:36,711 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:36,711 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:46:36,711 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:36,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:46:36,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:46:36,712 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 02:46:38,729 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 02:46:39,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:39,241 INFO L93 Difference]: Finished difference Result 281 states and 423 transitions. [2021-11-23 02:46:39,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:46:39,243 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 02:46:39,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:39,244 INFO L225 Difference]: With dead ends: 281 [2021-11-23 02:46:39,244 INFO L226 Difference]: Without dead ends: 155 [2021-11-23 02:46:39,245 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 02:46:39,246 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, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:39,246 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 234 Invalid, 313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 280 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-23 02:46:39,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-23 02:46:39,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2021-11-23 02:46:39,253 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 02:46:39,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 226 transitions. [2021-11-23 02:46:39,255 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 226 transitions. Word has length 64 [2021-11-23 02:46:39,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:39,255 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 226 transitions. [2021-11-23 02:46:39,255 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 02:46:39,256 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 226 transitions. [2021-11-23 02:46:39,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 02:46:39,256 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:39,257 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 02:46:39,257 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 02:46:39,257 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:39,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:39,258 INFO L85 PathProgramCache]: Analyzing trace with hash -1969909480, now seen corresponding path program 1 times [2021-11-23 02:46:39,258 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:39,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1285549921] [2021-11-23 02:46:39,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:39,259 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:39,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:39,327 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 02:46:39,328 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:39,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1285549921] [2021-11-23 02:46:39,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1285549921] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:39,328 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:39,328 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:46:39,329 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112834774] [2021-11-23 02:46:39,329 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:39,329 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:39,329 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:39,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:39,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:39,330 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 02:46:41,343 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 02:46:41,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:41,655 INFO L93 Difference]: Finished difference Result 310 states and 455 transitions. [2021-11-23 02:46:41,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:41,656 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 02:46:41,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:41,657 INFO L225 Difference]: With dead ends: 310 [2021-11-23 02:46:41,657 INFO L226 Difference]: Without dead ends: 168 [2021-11-23 02:46:41,658 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 02:46:41,658 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 30 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s 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, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:41,659 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 333 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 175 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:46:41,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-23 02:46:41,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 154. [2021-11-23 02:46:41,665 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 02:46:41,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 225 transitions. [2021-11-23 02:46:41,666 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 225 transitions. Word has length 65 [2021-11-23 02:46:41,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:41,666 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 225 transitions. [2021-11-23 02:46:41,666 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 02:46:41,666 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 225 transitions. [2021-11-23 02:46:41,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 02:46:41,667 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:41,667 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 02:46:41,667 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 02:46:41,668 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:41,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:41,668 INFO L85 PathProgramCache]: Analyzing trace with hash 555424398, now seen corresponding path program 1 times [2021-11-23 02:46:41,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:41,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768984403] [2021-11-23 02:46:41,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:41,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:41,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:41,736 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 02:46:41,736 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:41,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768984403] [2021-11-23 02:46:41,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1768984403] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:41,737 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:41,737 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:46:41,737 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188137915] [2021-11-23 02:46:41,737 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:41,738 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:41,738 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:41,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:41,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:41,739 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 02:46:43,750 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 02:46:44,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:44,109 INFO L93 Difference]: Finished difference Result 310 states and 453 transitions. [2021-11-23 02:46:44,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:44,110 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 02:46:44,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:44,111 INFO L225 Difference]: With dead ends: 310 [2021-11-23 02:46:44,112 INFO L226 Difference]: Without dead ends: 168 [2021-11-23 02:46:44,112 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 02:46:44,113 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 02:46:44,113 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 02:46:44,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-23 02:46:44,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 154. [2021-11-23 02:46:44,121 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 02:46:44,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 224 transitions. [2021-11-23 02:46:44,122 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 224 transitions. Word has length 65 [2021-11-23 02:46:44,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:44,122 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 224 transitions. [2021-11-23 02:46:44,123 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 02:46:44,123 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 224 transitions. [2021-11-23 02:46:44,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 02:46:44,124 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:44,124 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 02:46:44,124 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 02:46:44,124 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:44,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:44,125 INFO L85 PathProgramCache]: Analyzing trace with hash -810350896, now seen corresponding path program 1 times [2021-11-23 02:46:44,125 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:44,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053948230] [2021-11-23 02:46:44,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:44,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:44,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:44,191 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 02:46:44,191 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:44,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053948230] [2021-11-23 02:46:44,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2053948230] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:44,191 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:44,192 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:46:44,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363847414] [2021-11-23 02:46:44,192 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:44,192 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:44,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:44,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:44,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:44,193 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 02:46:46,205 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:46:46,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:46,529 INFO L93 Difference]: Finished difference Result 310 states and 451 transitions. [2021-11-23 02:46:46,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:46,530 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 02:46:46,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:46,531 INFO L225 Difference]: With dead ends: 310 [2021-11-23 02:46:46,532 INFO L226 Difference]: Without dead ends: 168 [2021-11-23 02:46:46,534 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 02:46:46,535 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 23 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s 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 02:46:46,535 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 02:46:46,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-23 02:46:46,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 154. [2021-11-23 02:46:46,542 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 02:46:46,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 223 transitions. [2021-11-23 02:46:46,543 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 223 transitions. Word has length 65 [2021-11-23 02:46:46,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:46,544 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 223 transitions. [2021-11-23 02:46:46,544 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 02:46:46,544 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 223 transitions. [2021-11-23 02:46:46,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 02:46:46,545 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:46,545 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 02:46:46,545 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-23 02:46:46,545 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:46,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:46,546 INFO L85 PathProgramCache]: Analyzing trace with hash 352323100, now seen corresponding path program 1 times [2021-11-23 02:46:46,546 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:46,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [99541295] [2021-11-23 02:46:46,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:46,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:46,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:46,606 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 02:46:46,606 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:46,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [99541295] [2021-11-23 02:46:46,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [99541295] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:46,607 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:46,607 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:46:46,607 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724018373] [2021-11-23 02:46:46,607 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:46,608 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:46,608 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:46,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:46,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:46,609 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 02:46:48,621 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 02:46:48,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:48,958 INFO L93 Difference]: Finished difference Result 310 states and 449 transitions. [2021-11-23 02:46:48,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:48,960 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 02:46:48,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:48,962 INFO L225 Difference]: With dead ends: 310 [2021-11-23 02:46:48,962 INFO L226 Difference]: Without dead ends: 168 [2021-11-23 02:46:48,962 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 02:46:48,963 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 02:46:48,963 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 02:46:48,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-23 02:46:48,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 154. [2021-11-23 02:46:48,970 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 02:46:48,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 222 transitions. [2021-11-23 02:46:48,972 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 222 transitions. Word has length 66 [2021-11-23 02:46:48,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:48,972 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 222 transitions. [2021-11-23 02:46:48,972 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 02:46:48,972 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 222 transitions. [2021-11-23 02:46:48,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 02:46:48,973 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:48,973 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 02:46:48,973 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-23 02:46:48,974 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:48,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:48,975 INFO L85 PathProgramCache]: Analyzing trace with hash 512269906, now seen corresponding path program 1 times [2021-11-23 02:46:48,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:48,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [718242392] [2021-11-23 02:46:48,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:48,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:49,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:49,051 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 02:46:49,051 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:49,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [718242392] [2021-11-23 02:46:49,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [718242392] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:49,052 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:49,052 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:46:49,052 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321396062] [2021-11-23 02:46:49,052 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:49,053 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:49,053 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:49,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:49,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:49,054 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 02:46:51,067 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 02:46:51,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:51,445 INFO L93 Difference]: Finished difference Result 308 states and 445 transitions. [2021-11-23 02:46:51,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:51,447 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 02:46:51,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:51,449 INFO L225 Difference]: With dead ends: 308 [2021-11-23 02:46:51,449 INFO L226 Difference]: Without dead ends: 166 [2021-11-23 02:46:51,449 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 02:46:51,450 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, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:51,450 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 337 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 171 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:46:51,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-23 02:46:51,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 154. [2021-11-23 02:46:51,457 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 02:46:51,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 221 transitions. [2021-11-23 02:46:51,458 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 221 transitions. Word has length 66 [2021-11-23 02:46:51,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:51,459 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 221 transitions. [2021-11-23 02:46:51,459 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 02:46:51,459 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 221 transitions. [2021-11-23 02:46:51,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 02:46:51,460 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:51,460 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 02:46:51,461 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-23 02:46:51,461 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:51,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:51,461 INFO L85 PathProgramCache]: Analyzing trace with hash 2000287155, now seen corresponding path program 1 times [2021-11-23 02:46:51,462 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:51,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [867363940] [2021-11-23 02:46:51,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:51,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:51,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:51,535 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 02:46:51,535 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:51,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [867363940] [2021-11-23 02:46:51,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [867363940] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:51,536 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:51,536 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:46:51,536 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601194173] [2021-11-23 02:46:51,536 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:51,537 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:51,537 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:51,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:51,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:51,538 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 02:46:53,551 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 02:46:53,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:53,924 INFO L93 Difference]: Finished difference Result 308 states and 443 transitions. [2021-11-23 02:46:53,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:53,926 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 02:46:53,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:53,927 INFO L225 Difference]: With dead ends: 308 [2021-11-23 02:46:53,928 INFO L226 Difference]: Without dead ends: 166 [2021-11-23 02:46:53,929 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 02:46:53,929 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 24 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s 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, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:53,930 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 337 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 171 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:46:53,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-23 02:46:53,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 154. [2021-11-23 02:46:53,943 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 02:46:53,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 220 transitions. [2021-11-23 02:46:53,944 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 220 transitions. Word has length 67 [2021-11-23 02:46:53,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:53,945 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 220 transitions. [2021-11-23 02:46:53,947 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 02:46:53,947 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 220 transitions. [2021-11-23 02:46:53,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 02:46:53,948 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:53,948 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 02:46:53,949 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-23 02:46:53,949 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:53,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:53,950 INFO L85 PathProgramCache]: Analyzing trace with hash -74203881, now seen corresponding path program 1 times [2021-11-23 02:46:53,950 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:53,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1336901009] [2021-11-23 02:46:53,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:53,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:53,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:54,036 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 02:46:54,036 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:54,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1336901009] [2021-11-23 02:46:54,037 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1336901009] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:54,037 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:54,037 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:46:54,037 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236313581] [2021-11-23 02:46:54,037 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:54,039 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:54,039 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:54,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:54,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:54,040 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 02:46:56,051 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 02:46:56,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:56,401 INFO L93 Difference]: Finished difference Result 300 states and 432 transitions. [2021-11-23 02:46:56,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:56,402 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 02:46:56,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:56,404 INFO L225 Difference]: With dead ends: 300 [2021-11-23 02:46:56,404 INFO L226 Difference]: Without dead ends: 158 [2021-11-23 02:46:56,404 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 02:46:56,405 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 02:46:56,405 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 02:46:56,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-11-23 02:46:56,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 154. [2021-11-23 02:46:56,411 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 02:46:56,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 219 transitions. [2021-11-23 02:46:56,415 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 219 transitions. Word has length 68 [2021-11-23 02:46:56,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:56,415 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 219 transitions. [2021-11-23 02:46:56,415 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 02:46:56,415 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 219 transitions. [2021-11-23 02:46:56,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 02:46:56,416 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:56,416 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 02:46:56,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-23 02:46:56,417 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:56,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:56,418 INFO L85 PathProgramCache]: Analyzing trace with hash -8655381, now seen corresponding path program 1 times [2021-11-23 02:46:56,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:56,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603774534] [2021-11-23 02:46:56,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:56,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:56,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:56,525 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:46:56,525 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:56,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603774534] [2021-11-23 02:46:56,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [603774534] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:46:56,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [223052975] [2021-11-23 02:46:56,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:56,526 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:46:56,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:46:56,528 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:46:56,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:46:56,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:56,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:46:56,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:46:57,018 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:46:57,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:46:57,281 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:46:57,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [223052975] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:46:57,281 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:46:57,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4, 4] total 5 [2021-11-23 02:46:57,282 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684042828] [2021-11-23 02:46:57,282 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:57,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:46:57,283 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:57,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:46:57,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:46:57,284 INFO L87 Difference]: Start difference. First operand 154 states and 219 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:46:59,318 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 02:46:59,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:59,511 INFO L93 Difference]: Finished difference Result 295 states and 425 transitions. [2021-11-23 02:46:59,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:46:59,512 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-23 02:46:59,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:59,515 INFO L225 Difference]: With dead ends: 295 [2021-11-23 02:46:59,515 INFO L226 Difference]: Without dead ends: 293 [2021-11-23 02:46:59,515 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:46:59,516 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 103 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 14 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:59,516 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 266 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 54 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2021-11-23 02:46:59,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2021-11-23 02:46:59,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 290. [2021-11-23 02:46:59,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 290 states, 289 states have (on average 1.4498269896193772) internal successors, (419), 289 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:46:59,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 419 transitions. [2021-11-23 02:46:59,531 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 419 transitions. Word has length 71 [2021-11-23 02:46:59,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:59,532 INFO L470 AbstractCegarLoop]: Abstraction has 290 states and 419 transitions. [2021-11-23 02:46:59,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:46:59,532 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 419 transitions. [2021-11-23 02:46:59,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-23 02:46:59,534 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:59,534 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 02:46:59,575 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:46:59,754 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:46:59,755 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:59,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:59,755 INFO L85 PathProgramCache]: Analyzing trace with hash 1895753652, now seen corresponding path program 1 times [2021-11-23 02:46:59,755 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:59,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1524919584] [2021-11-23 02:46:59,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:59,756 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:59,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:59,955 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 02:46:59,956 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:59,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1524919584] [2021-11-23 02:46:59,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1524919584] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:59,956 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:59,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:46:59,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523141598] [2021-11-23 02:46:59,957 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:59,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:46:59,958 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:59,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:46:59,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:46:59,959 INFO L87 Difference]: Start difference. First operand 290 states and 419 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 02:47:01,972 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 02:47:02,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:47:02,837 INFO L93 Difference]: Finished difference Result 750 states and 1100 transitions. [2021-11-23 02:47:02,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:47:02,840 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 02:47:02,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:47:02,844 INFO L225 Difference]: With dead ends: 750 [2021-11-23 02:47:02,844 INFO L226 Difference]: Without dead ends: 472 [2021-11-23 02:47:02,845 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 02:47:02,846 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 147 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 406 mSolverCounterSat, 16 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 401 SdHoareTripleChecker+Invalid, 423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 406 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:47:02,846 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [147 Valid, 401 Invalid, 423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 406 Invalid, 1 Unknown, 0 Unchecked, 2.8s Time] [2021-11-23 02:47:02,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2021-11-23 02:47:02,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 368. [2021-11-23 02:47:02,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 368 states, 367 states have (on average 1.5286103542234333) internal successors, (561), 367 states have internal predecessors, (561), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:47:02,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 561 transitions. [2021-11-23 02:47:02,885 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 561 transitions. Word has length 110 [2021-11-23 02:47:02,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:47:02,886 INFO L470 AbstractCegarLoop]: Abstraction has 368 states and 561 transitions. [2021-11-23 02:47:02,886 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 02:47:02,886 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 561 transitions. [2021-11-23 02:47:02,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-23 02:47:02,888 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:47:02,889 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 02:47:02,889 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-23 02:47:02,889 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:47:02,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:47:02,890 INFO L85 PathProgramCache]: Analyzing trace with hash 2096018837, now seen corresponding path program 1 times [2021-11-23 02:47:02,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:47:02,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1373861711] [2021-11-23 02:47:02,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:47:02,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:47:02,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:47:03,015 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 02:47:03,015 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:47:03,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1373861711] [2021-11-23 02:47:03,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1373861711] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:47:03,016 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:47:03,016 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:47:03,017 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603161626] [2021-11-23 02:47:03,017 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:47:03,017 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:47:03,017 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:47:03,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:47:03,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:47:03,018 INFO L87 Difference]: Start difference. First operand 368 states and 561 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 02:47:05,032 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 02:47:05,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:47:05,619 INFO L93 Difference]: Finished difference Result 820 states and 1230 transitions. [2021-11-23 02:47:05,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:47:05,623 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 02:47:05,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:47:05,626 INFO L225 Difference]: With dead ends: 820 [2021-11-23 02:47:05,626 INFO L226 Difference]: Without dead ends: 464 [2021-11-23 02:47:05,628 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 02:47:05,629 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 98 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 10 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 291 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:47:05,629 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 291 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 258 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2021-11-23 02:47:05,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 464 states. [2021-11-23 02:47:05,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 464 to 368. [2021-11-23 02:47:05,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 368 states, 367 states have (on average 1.5231607629427792) internal successors, (559), 367 states have internal predecessors, (559), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:47:05,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 559 transitions. [2021-11-23 02:47:05,650 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 559 transitions. Word has length 122 [2021-11-23 02:47:05,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:47:05,650 INFO L470 AbstractCegarLoop]: Abstraction has 368 states and 559 transitions. [2021-11-23 02:47:05,651 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 02:47:05,651 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 559 transitions. [2021-11-23 02:47:05,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-23 02:47:05,653 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:47:05,653 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, 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 02:47:05,653 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-23 02:47:05,654 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:47:05,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:47:05,654 INFO L85 PathProgramCache]: Analyzing trace with hash 2021528415, now seen corresponding path program 1 times [2021-11-23 02:47:05,655 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:47:05,655 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1647696468] [2021-11-23 02:47:05,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:47:05,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:47:05,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:47:05,765 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 98 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 02:47:05,765 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:47:05,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1647696468] [2021-11-23 02:47:05,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1647696468] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:47:05,766 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:47:05,766 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:47:05,767 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351440393] [2021-11-23 02:47:05,767 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:47:05,767 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:47:05,767 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:47:05,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:47:05,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:47:05,768 INFO L87 Difference]: Start difference. First operand 368 states and 559 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 02:47:07,781 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 02:47:08,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:47:08,367 INFO L93 Difference]: Finished difference Result 848 states and 1294 transitions. [2021-11-23 02:47:08,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:47:08,370 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 122 [2021-11-23 02:47:08,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:47:08,374 INFO L225 Difference]: With dead ends: 848 [2021-11-23 02:47:08,374 INFO L226 Difference]: Without dead ends: 492 [2021-11-23 02:47:08,375 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 02:47:08,383 INFO L933 BasicCegarLoop]: 178 mSDtfsCounter, 46 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 427 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:47:08,384 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 427 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 251 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2021-11-23 02:47:08,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2021-11-23 02:47:08,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 428. [2021-11-23 02:47:08,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 428 states, 427 states have (on average 1.5573770491803278) internal successors, (665), 427 states have internal predecessors, (665), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:47:08,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 665 transitions. [2021-11-23 02:47:08,409 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 665 transitions. Word has length 122 [2021-11-23 02:47:08,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:47:08,410 INFO L470 AbstractCegarLoop]: Abstraction has 428 states and 665 transitions. [2021-11-23 02:47:08,410 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 02:47:08,410 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 665 transitions. [2021-11-23 02:47:08,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-23 02:47:08,413 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:47:08,413 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 02:47:08,413 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-23 02:47:08,413 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:47:08,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:47:08,414 INFO L85 PathProgramCache]: Analyzing trace with hash 768393437, now seen corresponding path program 1 times [2021-11-23 02:47:08,414 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:47:08,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761470623] [2021-11-23 02:47:08,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:47:08,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:47:08,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:47:08,523 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 02:47:08,523 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:47:08,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761470623] [2021-11-23 02:47:08,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1761470623] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:47:08,524 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:47:08,524 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:47:08,524 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675151323] [2021-11-23 02:47:08,524 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:47:08,525 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:47:08,525 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:47:08,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:47:08,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:47:08,526 INFO L87 Difference]: Start difference. First operand 428 states and 665 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 02:47:10,543 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 02:47:11,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:47:11,317 INFO L93 Difference]: Finished difference Result 1024 states and 1591 transitions. [2021-11-23 02:47:11,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:47:11,319 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 02:47:11,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:47:11,324 INFO L225 Difference]: With dead ends: 1024 [2021-11-23 02:47:11,324 INFO L226 Difference]: Without dead ends: 608 [2021-11-23 02:47:11,325 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 02:47:11,326 INFO L933 BasicCegarLoop]: 197 mSDtfsCounter, 74 mSDsluCounter, 308 mSDsCounter, 0 mSdLazyCounter, 305 mSolverCounterSat, 10 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 467 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 305 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:47:11,327 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 467 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 305 Invalid, 1 Unknown, 0 Unchecked, 2.7s Time] [2021-11-23 02:47:11,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 608 states. [2021-11-23 02:47:11,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 608 to 509. [2021-11-23 02:47:11,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 509 states, 508 states have (on average 1.6023622047244095) internal successors, (814), 508 states have internal predecessors, (814), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:47:11,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 509 states to 509 states and 814 transitions. [2021-11-23 02:47:11,353 INFO L78 Accepts]: Start accepts. Automaton has 509 states and 814 transitions. Word has length 122 [2021-11-23 02:47:11,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:47:11,353 INFO L470 AbstractCegarLoop]: Abstraction has 509 states and 814 transitions. [2021-11-23 02:47:11,354 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 02:47:11,354 INFO L276 IsEmpty]: Start isEmpty. Operand 509 states and 814 transitions. [2021-11-23 02:47:11,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-23 02:47:11,356 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:47:11,357 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 02:47:11,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-23 02:47:11,357 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:47:11,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:47:11,358 INFO L85 PathProgramCache]: Analyzing trace with hash 1790092917, now seen corresponding path program 1 times [2021-11-23 02:47:11,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:47:11,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091785148] [2021-11-23 02:47:11,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:47:11,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:47:11,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:47:11,559 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 02:47:11,560 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:47:11,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091785148] [2021-11-23 02:47:11,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2091785148] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:47:11,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [860875839] [2021-11-23 02:47:11,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:47:11,561 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:47:11,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:47:11,563 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:47:11,569 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:47:11,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:47:11,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 520 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:47:11,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:47:11,994 INFO L354 Elim1Store]: treesize reduction 74, result has 46.0 percent of original size [2021-11-23 02:47:11,995 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 02:47:12,007 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 02:47:12,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 110 treesize of output 80 [2021-11-23 02:47:12,078 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 02:47:12,277 INFO L354 Elim1Store]: treesize reduction 5, result has 68.8 percent of original size [2021-11-23 02:47:12,278 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 18 [2021-11-23 02:47:12,646 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 02:47:12,757 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 02:47:12,757 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:47:12,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [860875839] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:47:12,758 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:47:12,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 9 [2021-11-23 02:47:12,758 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187202328] [2021-11-23 02:47:12,759 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:47:12,759 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:47:12,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:47:12,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:47:12,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:47:12,760 INFO L87 Difference]: Start difference. First operand 509 states and 814 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 02:47:14,774 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 02:47:15,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:47:15,441 INFO L93 Difference]: Finished difference Result 1186 states and 1889 transitions. [2021-11-23 02:47:15,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:47:15,441 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 02:47:15,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:47:15,446 INFO L225 Difference]: With dead ends: 1186 [2021-11-23 02:47:15,446 INFO L226 Difference]: Without dead ends: 689 [2021-11-23 02:47:15,447 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:47:15,448 INFO L933 BasicCegarLoop]: 202 mSDtfsCounter, 74 mSDsluCounter, 311 mSDsCounter, 0 mSdLazyCounter, 306 mSolverCounterSat, 10 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 475 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 306 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:47:15,448 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 475 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 306 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2021-11-23 02:47:15,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 689 states. [2021-11-23 02:47:15,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 689 to 509. [2021-11-23 02:47:15,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 509 states, 508 states have (on average 1.6023622047244095) internal successors, (814), 508 states have internal predecessors, (814), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:47:15,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 509 states to 509 states and 814 transitions. [2021-11-23 02:47:15,473 INFO L78 Accepts]: Start accepts. Automaton has 509 states and 814 transitions. Word has length 123 [2021-11-23 02:47:15,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:47:15,473 INFO L470 AbstractCegarLoop]: Abstraction has 509 states and 814 transitions. [2021-11-23 02:47:15,473 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 02:47:15,474 INFO L276 IsEmpty]: Start isEmpty. Operand 509 states and 814 transitions. [2021-11-23 02:47:15,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-23 02:47:15,476 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:47:15,476 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 02:47:15,518 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:47:15,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-23 02:47:15,690 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:47:15,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:47:15,690 INFO L85 PathProgramCache]: Analyzing trace with hash -1984895098, now seen corresponding path program 1 times [2021-11-23 02:47:15,690 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:47:15,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364212995] [2021-11-23 02:47:15,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:47:15,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:47:15,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:47:15,776 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 02:47:15,776 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:47:15,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364212995] [2021-11-23 02:47:15,777 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1364212995] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:47:15,777 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:47:15,777 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:47:15,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232266014] [2021-11-23 02:47:15,777 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:47:15,778 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:47:15,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:47:15,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:47:15,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:47:15,780 INFO L87 Difference]: Start difference. First operand 509 states and 814 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 02:47:17,796 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 02:47:18,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:47:18,389 INFO L93 Difference]: Finished difference Result 1184 states and 1886 transitions. [2021-11-23 02:47:18,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:47:18,391 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 02:47:18,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:47:18,396 INFO L225 Difference]: With dead ends: 1184 [2021-11-23 02:47:18,396 INFO L226 Difference]: Without dead ends: 685 [2021-11-23 02:47:18,397 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 02:47:18,398 INFO L933 BasicCegarLoop]: 197 mSDtfsCounter, 72 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 9 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 467 SdHoareTripleChecker+Invalid, 310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:47:18,398 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 467 Invalid, 310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 300 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2021-11-23 02:47:18,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 685 states. [2021-11-23 02:47:18,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 685 to 589. [2021-11-23 02:47:18,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 589 states, 588 states have (on average 1.6326530612244898) internal successors, (960), 588 states have internal predecessors, (960), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:47:18,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 589 states to 589 states and 960 transitions. [2021-11-23 02:47:18,426 INFO L78 Accepts]: Start accepts. Automaton has 589 states and 960 transitions. Word has length 123 [2021-11-23 02:47:18,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:47:18,427 INFO L470 AbstractCegarLoop]: Abstraction has 589 states and 960 transitions. [2021-11-23 02:47:18,427 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 02:47:18,427 INFO L276 IsEmpty]: Start isEmpty. Operand 589 states and 960 transitions. [2021-11-23 02:47:18,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 02:47:18,430 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:47:18,430 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, 1] [2021-11-23 02:47:18,431 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-23 02:47:18,431 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:47:18,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:47:18,431 INFO L85 PathProgramCache]: Analyzing trace with hash -376982290, now seen corresponding path program 1 times [2021-11-23 02:47:18,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:47:18,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1961313754] [2021-11-23 02:47:18,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:47:18,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:47:18,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:47:18,601 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 02:47:18,601 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:47:18,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1961313754] [2021-11-23 02:47:18,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1961313754] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:47:18,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [979242843] [2021-11-23 02:47:18,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:47:18,602 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:47:18,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:47:18,608 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:47:18,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5f75554-e9d1-4ab5-aa9f-4f174a0daf89/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:47:18,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:47:18,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 523 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:47:18,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:47:19,233 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 73 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-23 02:47:19,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:47:20,033 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-23 02:47:20,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [979242843] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:47:20,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1169924581] [2021-11-23 02:47:20,067 INFO L159 IcfgInterpreter]: Started Sifa with 59 locations of interest [2021-11-23 02:47:20,067 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:47:20,074 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:47:20,080 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:47:20,081 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs