./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/openssl/s3_srvr.blast.07.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_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/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_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/openssl/s3_srvr.blast.07.i.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/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_1f2ac7fa-f499-410c-8e4d-c996c9685e98/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 8c6f82e874e2f980b653c53fa0437dd3390b1771d726d8f345336fe56afb2bb6 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:40:50,914 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:40:50,917 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:40:50,985 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:40:50,987 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:40:50,993 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:40:50,996 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:40:51,002 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:40:51,005 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:40:51,012 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:40:51,014 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:40:51,016 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:40:51,017 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:40:51,020 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:40:51,024 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:40:51,034 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:40:51,037 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:40:51,038 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:40:51,042 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:40:51,051 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:40:51,054 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:40:51,056 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:40:51,059 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:40:51,061 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:40:51,066 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:40:51,067 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:40:51,067 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:40:51,070 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:40:51,070 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:40:51,072 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:40:51,073 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:40:51,075 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:40:51,077 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:40:51,079 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:40:51,081 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:40:51,082 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:40:51,083 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:40:51,083 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:40:51,083 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:40:51,085 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:40:51,086 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:40:51,088 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:40:51,151 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:40:51,152 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:40:51,152 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:40:51,153 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:40:51,161 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:40:51,162 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:40:51,162 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:40:51,163 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:40:51,163 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:40:51,163 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:40:51,164 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:40:51,165 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:40:51,165 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:40:51,165 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:40:51,166 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:40:51,166 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:40:51,166 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:40:51,167 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:40:51,168 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:40:51,168 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:40:51,168 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:40:51,169 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:40:51,169 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:40:51,169 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:40:51,169 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:40:51,170 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:40:51,172 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:40:51,172 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:40:51,172 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:40:51,173 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:40:51,173 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:40:51,174 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:40:51,174 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:40:51,174 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:40:51,175 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:40:51,175 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:40:51,175 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:40:51,175 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:40:51,176 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:40:51,176 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:40:51,176 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:40:51,177 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_1f2ac7fa-f499-410c-8e4d-c996c9685e98/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8c6f82e874e2f980b653c53fa0437dd3390b1771d726d8f345336fe56afb2bb6 [2021-11-23 02:40:51,482 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:40:51,508 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:40:51,512 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:40:51,513 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:40:51,514 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:40:51,516 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/openssl/s3_srvr.blast.07.i.cil-2.c [2021-11-23 02:40:51,606 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/data/049269aab/3bf62638b6c74b64b2f65f2d3a7885a1/FLAG64a8ece12 [2021-11-23 02:40:52,376 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:40:52,376 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/sv-benchmarks/c/openssl/s3_srvr.blast.07.i.cil-2.c [2021-11-23 02:40:52,419 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/data/049269aab/3bf62638b6c74b64b2f65f2d3a7885a1/FLAG64a8ece12 [2021-11-23 02:40:52,530 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/data/049269aab/3bf62638b6c74b64b2f65f2d3a7885a1 [2021-11-23 02:40:52,539 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:40:52,543 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:40:52,546 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:40:52,547 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:40:52,551 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:40:52,552 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:40:52" (1/1) ... [2021-11-23 02:40:52,555 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5f31c293 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:40:52, skipping insertion in model container [2021-11-23 02:40:52,556 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:40:52" (1/1) ... [2021-11-23 02:40:52,564 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:40:52,663 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:40:53,208 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_1f2ac7fa-f499-410c-8e4d-c996c9685e98/sv-benchmarks/c/openssl/s3_srvr.blast.07.i.cil-2.c[74369,74382] [2021-11-23 02:40:53,220 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:40:53,237 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:40:53,431 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_1f2ac7fa-f499-410c-8e4d-c996c9685e98/sv-benchmarks/c/openssl/s3_srvr.blast.07.i.cil-2.c[74369,74382] [2021-11-23 02:40:53,435 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:40:53,469 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:40:53,470 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:40:53 WrapperNode [2021-11-23 02:40:53,470 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:40:53,471 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:40:53,471 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:40:53,472 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:40:53,481 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:40:53" (1/1) ... [2021-11-23 02:40:53,531 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:40:53" (1/1) ... [2021-11-23 02:40:53,620 INFO L137 Inliner]: procedures = 31, calls = 223, calls flagged for inlining = 7, calls inlined = 3, statements flattened = 792 [2021-11-23 02:40:53,622 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:40:53,623 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:40:53,624 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:40:53,624 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:40:53,635 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:40:53" (1/1) ... [2021-11-23 02:40:53,635 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:40:53" (1/1) ... [2021-11-23 02:40:53,657 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:40:53" (1/1) ... [2021-11-23 02:40:53,670 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:40:53" (1/1) ... [2021-11-23 02:40:53,745 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:40:53" (1/1) ... [2021-11-23 02:40:53,774 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:40:53" (1/1) ... [2021-11-23 02:40:53,778 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:40:53" (1/1) ... [2021-11-23 02:40:53,785 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:40:53,799 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:40:53,799 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:40:53,800 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:40:53,801 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:40:53" (1/1) ... [2021-11-23 02:40:53,829 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:40:53,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:40:53,860 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:40:53,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:40:53,949 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:40:53,949 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 02:40:53,950 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 02:40:53,950 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 02:40:53,950 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 02:40:53,950 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:40:53,951 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 02:40:53,951 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:40:53,951 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:40:54,154 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:40:54,156 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:40:54,181 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 02:40:55,856 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##90: assume false; [2021-11-23 02:40:55,857 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##91: assume !false; [2021-11-23 02:40:55,857 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:40:56,361 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:40:56,361 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 02:40:56,369 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:40:56 BoogieIcfgContainer [2021-11-23 02:40:56,370 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:40:56,372 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:40:56,372 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:40:56,376 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:40:56,377 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:40:52" (1/3) ... [2021-11-23 02:40:56,378 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65509159 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:40:56, skipping insertion in model container [2021-11-23 02:40:56,378 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:40:53" (2/3) ... [2021-11-23 02:40:56,379 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65509159 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:40:56, skipping insertion in model container [2021-11-23 02:40:56,379 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:40:56" (3/3) ... [2021-11-23 02:40:56,381 INFO L111 eAbstractionObserver]: Analyzing ICFG s3_srvr.blast.07.i.cil-2.c [2021-11-23 02:40:56,388 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:40:56,389 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:40:56,447 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:40:56,456 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 02:40:56,457 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:40:56,480 INFO L276 IsEmpty]: Start isEmpty. Operand has 109 states, 107 states have (on average 1.7570093457943925) internal successors, (188), 108 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:40:56,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 02:40:56,490 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:40:56,491 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:40:56,492 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:40:56,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:40:56,499 INFO L85 PathProgramCache]: Analyzing trace with hash -1727946225, now seen corresponding path program 1 times [2021-11-23 02:40:56,512 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:40:56,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432694350] [2021-11-23 02:40:56,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:40:56,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:40:56,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:40:57,073 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 02:40:57,074 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:40:57,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432694350] [2021-11-23 02:40:57,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1432694350] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:40:57,076 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:40:57,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:40:57,078 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869023972] [2021-11-23 02:40:57,079 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:40:57,085 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:40:57,085 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:40:57,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:40:57,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:40:57,179 INFO L87 Difference]: Start difference. First operand has 109 states, 107 states have (on average 1.7570093457943925) internal successors, (188), 108 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 3 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:40:59,251 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:40:59,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:40:59,921 INFO L93 Difference]: Finished difference Result 241 states and 416 transitions. [2021-11-23 02:40:59,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:40:59,930 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 3 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-23 02:40:59,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:40:59,944 INFO L225 Difference]: With dead ends: 241 [2021-11-23 02:40:59,945 INFO L226 Difference]: Without dead ends: 128 [2021-11-23 02:40:59,951 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 02:40:59,963 INFO L933 BasicCegarLoop]: 149 mSDtfsCounter, 20 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 393 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:40:59,970 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 393 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 160 Invalid, 1 Unknown, 0 Unchecked, 2.7s Time] [2021-11-23 02:40:59,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-23 02:41:00,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 116. [2021-11-23 02:41:00,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.5391304347826087) internal successors, (177), 115 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 02:41:00,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 177 transitions. [2021-11-23 02:41:00,027 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 177 transitions. Word has length 29 [2021-11-23 02:41:00,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:00,028 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 177 transitions. [2021-11-23 02:41:00,028 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 3 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:00,029 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 177 transitions. [2021-11-23 02:41:00,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-23 02:41:00,031 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:00,032 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:00,032 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:41:00,033 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:00,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:00,034 INFO L85 PathProgramCache]: Analyzing trace with hash 1758311644, now seen corresponding path program 1 times [2021-11-23 02:41:00,034 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:00,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1512138083] [2021-11-23 02:41:00,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:00,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:00,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:00,216 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 02:41:00,216 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:00,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1512138083] [2021-11-23 02:41:00,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1512138083] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:41:00,218 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:41:00,218 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:41:00,218 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380541466] [2021-11-23 02:41:00,219 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:00,220 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:41:00,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:00,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:41:00,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:41:00,222 INFO L87 Difference]: Start difference. First operand 116 states and 177 transitions. Second operand has 4 states, 4 states have (on average 9.75) internal successors, (39), 3 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:02,242 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 02:41:02,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:02,699 INFO L93 Difference]: Finished difference Result 232 states and 348 transitions. [2021-11-23 02:41:02,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:41:02,700 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 3 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-23 02:41:02,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:02,703 INFO L225 Difference]: With dead ends: 232 [2021-11-23 02:41:02,703 INFO L226 Difference]: Without dead ends: 128 [2021-11-23 02:41:02,704 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 02:41:02,706 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 19 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 325 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:02,706 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 325 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 148 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:41:02,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-23 02:41:02,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 116. [2021-11-23 02:41:02,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.5304347826086957) internal successors, (176), 115 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 02:41:02,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 176 transitions. [2021-11-23 02:41:02,722 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 176 transitions. Word has length 39 [2021-11-23 02:41:02,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:02,723 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 176 transitions. [2021-11-23 02:41:02,723 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 3 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:02,723 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 176 transitions. [2021-11-23 02:41:02,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-23 02:41:02,726 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:02,726 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:02,726 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:41:02,726 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:02,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:02,727 INFO L85 PathProgramCache]: Analyzing trace with hash 1594262621, now seen corresponding path program 1 times [2021-11-23 02:41:02,728 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:02,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1713685530] [2021-11-23 02:41:02,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:02,729 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:02,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:02,880 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 02:41:02,880 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:02,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1713685530] [2021-11-23 02:41:02,881 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1713685530] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:41:02,881 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:41:02,881 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:41:02,882 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093272878] [2021-11-23 02:41:02,882 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:02,882 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:41:02,883 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:02,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:41:02,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:41:02,884 INFO L87 Difference]: Start difference. First operand 116 states and 176 transitions. Second operand has 4 states, 4 states have (on average 10.0) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:04,901 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 02:41:05,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:05,337 INFO L93 Difference]: Finished difference Result 232 states and 347 transitions. [2021-11-23 02:41:05,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:41:05,338 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.0) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-23 02:41:05,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:05,340 INFO L225 Difference]: With dead ends: 232 [2021-11-23 02:41:05,340 INFO L226 Difference]: Without dead ends: 128 [2021-11-23 02:41:05,341 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:41:05,343 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 17 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:05,344 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 324 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 149 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:41:05,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-23 02:41:05,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 116. [2021-11-23 02:41:05,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.5217391304347827) internal successors, (175), 115 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 02:41:05,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 175 transitions. [2021-11-23 02:41:05,363 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 175 transitions. Word has length 40 [2021-11-23 02:41:05,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:05,363 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 175 transitions. [2021-11-23 02:41:05,363 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.0) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:05,364 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 175 transitions. [2021-11-23 02:41:05,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 02:41:05,366 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:05,366 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:05,367 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:41:05,367 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:05,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:05,368 INFO L85 PathProgramCache]: Analyzing trace with hash 937174827, now seen corresponding path program 1 times [2021-11-23 02:41:05,368 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:05,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1087367117] [2021-11-23 02:41:05,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:05,369 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:05,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:05,503 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 02:41:05,504 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:05,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1087367117] [2021-11-23 02:41:05,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1087367117] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:41:05,505 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:41:05,505 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:41:05,505 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270571275] [2021-11-23 02:41:05,505 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:05,506 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:41:05,506 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:05,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:41:05,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:41:05,507 INFO L87 Difference]: Start difference. First operand 116 states and 175 transitions. Second operand has 4 states, 4 states have (on average 10.25) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:07,522 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 02:41:07,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:07,969 INFO L93 Difference]: Finished difference Result 232 states and 346 transitions. [2021-11-23 02:41:07,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:41:07,970 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.25) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-23 02:41:07,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:07,972 INFO L225 Difference]: With dead ends: 232 [2021-11-23 02:41:07,972 INFO L226 Difference]: Without dead ends: 128 [2021-11-23 02:41:07,973 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 02:41:07,975 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 15 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:07,975 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 324 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 149 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:41:07,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-23 02:41:07,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 116. [2021-11-23 02:41:07,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.5130434782608695) internal successors, (174), 115 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 02:41:07,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 174 transitions. [2021-11-23 02:41:07,989 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 174 transitions. Word has length 41 [2021-11-23 02:41:07,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:07,989 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 174 transitions. [2021-11-23 02:41:07,990 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.25) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:07,990 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 174 transitions. [2021-11-23 02:41:07,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 02:41:07,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:07,992 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:07,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:41:07,993 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:07,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:07,994 INFO L85 PathProgramCache]: Analyzing trace with hash 1600964730, now seen corresponding path program 1 times [2021-11-23 02:41:07,994 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:07,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079386683] [2021-11-23 02:41:07,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:07,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:08,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:08,158 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 02:41:08,159 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:08,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079386683] [2021-11-23 02:41:08,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1079386683] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:41:08,159 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:41:08,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:41:08,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205524974] [2021-11-23 02:41:08,160 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:08,161 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:41:08,161 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:08,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:41:08,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:41:08,165 INFO L87 Difference]: Start difference. First operand 116 states and 174 transitions. Second operand has 4 states, 4 states have (on average 10.25) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:10,180 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 02:41:10,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:10,605 INFO L93 Difference]: Finished difference Result 232 states and 345 transitions. [2021-11-23 02:41:10,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:41:10,607 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.25) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-23 02:41:10,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:10,609 INFO L225 Difference]: With dead ends: 232 [2021-11-23 02:41:10,609 INFO L226 Difference]: Without dead ends: 128 [2021-11-23 02:41:10,610 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 02:41:10,611 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 11 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:10,612 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 324 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 149 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:41:10,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-23 02:41:10,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 116. [2021-11-23 02:41:10,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.5043478260869565) internal successors, (173), 115 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 02:41:10,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 173 transitions. [2021-11-23 02:41:10,624 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 173 transitions. Word has length 41 [2021-11-23 02:41:10,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:10,624 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 173 transitions. [2021-11-23 02:41:10,624 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.25) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:10,625 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 173 transitions. [2021-11-23 02:41:10,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 02:41:10,627 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:10,628 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:10,628 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:41:10,628 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:10,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:10,629 INFO L85 PathProgramCache]: Analyzing trace with hash 1346880773, now seen corresponding path program 1 times [2021-11-23 02:41:10,629 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:10,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565216166] [2021-11-23 02:41:10,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:10,630 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:10,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:10,711 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 02:41:10,711 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:10,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565216166] [2021-11-23 02:41:10,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1565216166] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:41:10,712 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:41:10,712 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:41:10,712 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297644204] [2021-11-23 02:41:10,712 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:10,713 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:41:10,713 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:10,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:41:10,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:41:10,714 INFO L87 Difference]: Start difference. First operand 116 states and 173 transitions. Second operand has 4 states, 4 states have (on average 10.25) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:12,729 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 02:41:13,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:13,138 INFO L93 Difference]: Finished difference Result 232 states and 344 transitions. [2021-11-23 02:41:13,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:41:13,140 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.25) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-23 02:41:13,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:13,141 INFO L225 Difference]: With dead ends: 232 [2021-11-23 02:41:13,141 INFO L226 Difference]: Without dead ends: 128 [2021-11-23 02:41:13,142 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 02:41:13,143 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 9 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 325 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:13,144 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 325 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 148 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:41:13,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-23 02:41:13,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 116. [2021-11-23 02:41:13,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.4956521739130435) internal successors, (172), 115 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:13,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 172 transitions. [2021-11-23 02:41:13,154 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 172 transitions. Word has length 41 [2021-11-23 02:41:13,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:13,155 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 172 transitions. [2021-11-23 02:41:13,155 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.25) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:13,156 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 172 transitions. [2021-11-23 02:41:13,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 02:41:13,158 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:13,158 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:13,159 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:41:13,159 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:13,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:13,160 INFO L85 PathProgramCache]: Analyzing trace with hash -1885808468, now seen corresponding path program 1 times [2021-11-23 02:41:13,160 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:13,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1732472664] [2021-11-23 02:41:13,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:13,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:13,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:13,244 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 02:41:13,244 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:13,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1732472664] [2021-11-23 02:41:13,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1732472664] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:41:13,245 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:41:13,245 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:41:13,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145778751] [2021-11-23 02:41:13,246 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:13,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:41:13,247 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:13,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:41:13,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:41:13,248 INFO L87 Difference]: Start difference. First operand 116 states and 172 transitions. Second operand has 4 states, 4 states have (on average 10.5) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:15,262 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 02:41:15,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:15,630 INFO L93 Difference]: Finished difference Result 230 states and 341 transitions. [2021-11-23 02:41:15,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:41:15,632 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-23 02:41:15,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:15,633 INFO L225 Difference]: With dead ends: 230 [2021-11-23 02:41:15,633 INFO L226 Difference]: Without dead ends: 126 [2021-11-23 02:41:15,634 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 02:41:15,635 INFO L933 BasicCegarLoop]: 128 mSDtfsCounter, 9 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:15,636 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 328 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 145 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:41:15,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-23 02:41:15,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 116. [2021-11-23 02:41:15,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.4869565217391305) internal successors, (171), 115 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:15,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 171 transitions. [2021-11-23 02:41:15,645 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 171 transitions. Word has length 42 [2021-11-23 02:41:15,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:15,646 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 171 transitions. [2021-11-23 02:41:15,646 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:15,646 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 171 transitions. [2021-11-23 02:41:15,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 02:41:15,648 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:15,649 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:15,649 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 02:41:15,649 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:15,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:15,650 INFO L85 PathProgramCache]: Analyzing trace with hash -1091110920, now seen corresponding path program 1 times [2021-11-23 02:41:15,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:15,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1244891484] [2021-11-23 02:41:15,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:15,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:15,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:15,730 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 02:41:15,730 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:15,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1244891484] [2021-11-23 02:41:15,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1244891484] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:41:15,731 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:41:15,731 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:41:15,731 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175057413] [2021-11-23 02:41:15,732 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:15,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:41:15,732 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:15,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:41:15,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:41:15,734 INFO L87 Difference]: Start difference. First operand 116 states and 171 transitions. Second operand has 4 states, 4 states have (on average 10.5) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:17,762 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 02:41:18,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:18,271 INFO L93 Difference]: Finished difference Result 230 states and 340 transitions. [2021-11-23 02:41:18,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:41:18,273 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-23 02:41:18,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:18,274 INFO L225 Difference]: With dead ends: 230 [2021-11-23 02:41:18,274 INFO L226 Difference]: Without dead ends: 126 [2021-11-23 02:41:18,275 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 02:41:18,276 INFO L933 BasicCegarLoop]: 128 mSDtfsCounter, 11 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:18,277 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 328 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 145 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-23 02:41:18,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-23 02:41:18,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 116. [2021-11-23 02:41:18,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.4782608695652173) internal successors, (170), 115 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:18,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 170 transitions. [2021-11-23 02:41:18,285 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 170 transitions. Word has length 42 [2021-11-23 02:41:18,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:18,286 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 170 transitions. [2021-11-23 02:41:18,286 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:18,286 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 170 transitions. [2021-11-23 02:41:18,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 02:41:18,288 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:18,289 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:18,289 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 02:41:18,289 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:18,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:18,290 INFO L85 PathProgramCache]: Analyzing trace with hash 1618107046, now seen corresponding path program 1 times [2021-11-23 02:41:18,290 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:18,291 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097319379] [2021-11-23 02:41:18,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:18,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:18,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:18,377 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 02:41:18,378 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:18,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097319379] [2021-11-23 02:41:18,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2097319379] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:41:18,379 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:41:18,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:41:18,379 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230523305] [2021-11-23 02:41:18,379 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:18,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:41:18,380 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:18,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:41:18,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:41:18,382 INFO L87 Difference]: Start difference. First operand 116 states and 170 transitions. Second operand has 4 states, 4 states have (on average 10.75) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:20,396 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 02:41:20,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:20,736 INFO L93 Difference]: Finished difference Result 222 states and 329 transitions. [2021-11-23 02:41:20,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:41:20,738 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-23 02:41:20,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:20,739 INFO L225 Difference]: With dead ends: 222 [2021-11-23 02:41:20,739 INFO L226 Difference]: Without dead ends: 118 [2021-11-23 02:41:20,740 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 02:41:20,741 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 5 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:20,741 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 338 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 135 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:41:20,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-11-23 02:41:20,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 116. [2021-11-23 02:41:20,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.4695652173913043) internal successors, (169), 115 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:20,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 169 transitions. [2021-11-23 02:41:20,747 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 169 transitions. Word has length 43 [2021-11-23 02:41:20,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:20,748 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 169 transitions. [2021-11-23 02:41:20,748 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:20,748 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 169 transitions. [2021-11-23 02:41:20,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 02:41:20,749 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:20,749 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:20,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 02:41:20,750 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:20,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:20,750 INFO L85 PathProgramCache]: Analyzing trace with hash -939077214, now seen corresponding path program 1 times [2021-11-23 02:41:20,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:20,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [42823267] [2021-11-23 02:41:20,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:20,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:20,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:20,834 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 02:41:20,835 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:20,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [42823267] [2021-11-23 02:41:20,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [42823267] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:41:20,836 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:41:20,836 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:41:20,836 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645155416] [2021-11-23 02:41:20,836 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:20,837 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:41:20,837 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:20,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:41:20,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:41:20,838 INFO L87 Difference]: Start difference. First operand 116 states and 169 transitions. Second operand has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:22,852 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 02:41:23,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:23,241 INFO L93 Difference]: Finished difference Result 254 states and 377 transitions. [2021-11-23 02:41:23,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:41:23,242 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-23 02:41:23,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:23,244 INFO L225 Difference]: With dead ends: 254 [2021-11-23 02:41:23,244 INFO L226 Difference]: Without dead ends: 150 [2021-11-23 02:41:23,245 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 02:41:23,246 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 21 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 9 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:23,246 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 333 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 164 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:41:23,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-11-23 02:41:23,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 136. [2021-11-23 02:41:23,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 135 states have (on average 1.5037037037037038) internal successors, (203), 135 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:23,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 203 transitions. [2021-11-23 02:41:23,254 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 203 transitions. Word has length 44 [2021-11-23 02:41:23,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:23,255 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 203 transitions. [2021-11-23 02:41:23,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:23,256 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 203 transitions. [2021-11-23 02:41:23,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 02:41:23,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:23,257 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:23,257 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 02:41:23,258 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:23,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:23,259 INFO L85 PathProgramCache]: Analyzing trace with hash -776550225, now seen corresponding path program 1 times [2021-11-23 02:41:23,259 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:23,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1082670320] [2021-11-23 02:41:23,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:23,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:23,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:23,350 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 02:41:23,350 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:23,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1082670320] [2021-11-23 02:41:23,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1082670320] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:41:23,351 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:41:23,351 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:41:23,351 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491959864] [2021-11-23 02:41:23,352 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:23,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:41:23,352 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:23,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:41:23,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:41:23,354 INFO L87 Difference]: Start difference. First operand 136 states and 203 transitions. Second operand has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:25,368 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 02:41:25,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:25,773 INFO L93 Difference]: Finished difference Result 274 states and 410 transitions. [2021-11-23 02:41:25,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:41:25,775 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-23 02:41:25,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:25,777 INFO L225 Difference]: With dead ends: 274 [2021-11-23 02:41:25,777 INFO L226 Difference]: Without dead ends: 150 [2021-11-23 02:41:25,778 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 02:41:25,779 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 32 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 335 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:25,779 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 335 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 161 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:41:25,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-11-23 02:41:25,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 136. [2021-11-23 02:41:25,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 135 states have (on average 1.4962962962962962) internal successors, (202), 135 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:25,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 202 transitions. [2021-11-23 02:41:25,787 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 202 transitions. Word has length 54 [2021-11-23 02:41:25,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:25,787 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 202 transitions. [2021-11-23 02:41:25,788 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:25,788 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 202 transitions. [2021-11-23 02:41:25,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 02:41:25,789 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:25,789 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:25,789 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-23 02:41:25,790 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:25,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:25,791 INFO L85 PathProgramCache]: Analyzing trace with hash 322956010, now seen corresponding path program 1 times [2021-11-23 02:41:25,791 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:25,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [519730872] [2021-11-23 02:41:25,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:25,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:25,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:25,912 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 02:41:25,913 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:25,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [519730872] [2021-11-23 02:41:25,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [519730872] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:41:25,913 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:41:25,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:41:25,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037916980] [2021-11-23 02:41:25,914 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:25,914 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:41:25,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:25,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:41:25,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:41:25,916 INFO L87 Difference]: Start difference. First operand 136 states and 202 transitions. Second operand has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:27,930 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 02:41:28,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:28,447 INFO L93 Difference]: Finished difference Result 277 states and 415 transitions. [2021-11-23 02:41:28,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:41:28,449 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-23 02:41:28,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:28,451 INFO L225 Difference]: With dead ends: 277 [2021-11-23 02:41:28,451 INFO L226 Difference]: Without dead ends: 153 [2021-11-23 02:41:28,452 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 02:41:28,453 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 118 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 32 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 301 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:28,453 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [118 Valid, 234 Invalid, 301 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 268 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-23 02:41:28,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-11-23 02:41:28,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 152. [2021-11-23 02:41:28,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 151 states have (on average 1.4701986754966887) internal successors, (222), 151 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 02:41:28,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 222 transitions. [2021-11-23 02:41:28,462 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 222 transitions. Word has length 55 [2021-11-23 02:41:28,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:28,463 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 222 transitions. [2021-11-23 02:41:28,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:28,463 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 222 transitions. [2021-11-23 02:41:28,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-23 02:41:28,465 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:28,465 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:28,465 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 02:41:28,465 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:28,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:28,466 INFO L85 PathProgramCache]: Analyzing trace with hash -636033417, now seen corresponding path program 1 times [2021-11-23 02:41:28,467 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:28,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1642840560] [2021-11-23 02:41:28,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:28,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:28,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:28,576 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 02:41:28,576 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:28,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1642840560] [2021-11-23 02:41:28,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1642840560] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:41:28,577 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:41:28,577 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:41:28,578 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196703819] [2021-11-23 02:41:28,578 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:28,578 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:41:28,579 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:28,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:41:28,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:41:28,580 INFO L87 Difference]: Start difference. First operand 152 states and 222 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:30,594 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 02:41:31,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:31,010 INFO L93 Difference]: Finished difference Result 306 states and 447 transitions. [2021-11-23 02:41:31,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:41:31,012 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-23 02:41:31,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:31,014 INFO L225 Difference]: With dead ends: 306 [2021-11-23 02:41:31,014 INFO L226 Difference]: Without dead ends: 166 [2021-11-23 02:41:31,014 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 02:41:31,015 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 30 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 335 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:31,016 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 335 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 161 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:41:31,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-23 02:41:31,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 152. [2021-11-23 02:41:31,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 151 states have (on average 1.4635761589403973) internal successors, (221), 151 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 02:41:31,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 221 transitions. [2021-11-23 02:41:31,025 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 221 transitions. Word has length 56 [2021-11-23 02:41:31,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:31,026 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 221 transitions. [2021-11-23 02:41:31,026 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:31,026 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 221 transitions. [2021-11-23 02:41:31,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-23 02:41:31,027 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:31,028 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:31,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 02:41:31,028 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:31,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:31,029 INFO L85 PathProgramCache]: Analyzing trace with hash 845165453, now seen corresponding path program 1 times [2021-11-23 02:41:31,029 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:31,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940553062] [2021-11-23 02:41:31,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:31,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:31,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:31,124 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 02:41:31,124 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:31,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940553062] [2021-11-23 02:41:31,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [940553062] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:41:31,125 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:41:31,125 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:41:31,126 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533867606] [2021-11-23 02:41:31,126 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:31,126 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:41:31,126 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:31,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:41:31,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:41:31,128 INFO L87 Difference]: Start difference. First operand 152 states and 221 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:33,141 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 02:41:33,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:33,499 INFO L93 Difference]: Finished difference Result 306 states and 445 transitions. [2021-11-23 02:41:33,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:41:33,501 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-23 02:41:33,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:33,502 INFO L225 Difference]: With dead ends: 306 [2021-11-23 02:41:33,503 INFO L226 Difference]: Without dead ends: 166 [2021-11-23 02:41:33,503 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:41:33,504 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 25 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 335 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:33,505 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 335 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 161 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:41:33,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-23 02:41:33,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 152. [2021-11-23 02:41:33,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 151 states have (on average 1.4569536423841059) internal successors, (220), 151 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 02:41:33,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 220 transitions. [2021-11-23 02:41:33,551 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 220 transitions. Word has length 56 [2021-11-23 02:41:33,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:33,552 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 220 transitions. [2021-11-23 02:41:33,552 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:33,552 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 220 transitions. [2021-11-23 02:41:33,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-23 02:41:33,553 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:33,553 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:33,554 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 02:41:33,554 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:33,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:33,555 INFO L85 PathProgramCache]: Analyzing trace with hash 591081496, now seen corresponding path program 1 times [2021-11-23 02:41:33,555 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:33,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105305170] [2021-11-23 02:41:33,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:33,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:33,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:33,634 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 02:41:33,635 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:33,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105305170] [2021-11-23 02:41:33,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2105305170] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:41:33,635 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:41:33,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:41:33,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729526069] [2021-11-23 02:41:33,636 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:33,637 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:41:33,637 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:33,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:41:33,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:41:33,638 INFO L87 Difference]: Start difference. First operand 152 states and 220 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:35,655 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 02:41:36,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:36,095 INFO L93 Difference]: Finished difference Result 306 states and 443 transitions. [2021-11-23 02:41:36,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:41:36,097 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-23 02:41:36,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:36,099 INFO L225 Difference]: With dead ends: 306 [2021-11-23 02:41:36,099 INFO L226 Difference]: Without dead ends: 166 [2021-11-23 02:41:36,099 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 02:41:36,100 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 23 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 336 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:36,101 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 336 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 160 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:41:36,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-23 02:41:36,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 152. [2021-11-23 02:41:36,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 151 states have (on average 1.4503311258278146) internal successors, (219), 151 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 02:41:36,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 219 transitions. [2021-11-23 02:41:36,110 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 219 transitions. Word has length 56 [2021-11-23 02:41:36,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:36,111 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 219 transitions. [2021-11-23 02:41:36,111 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:36,112 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 219 transitions. [2021-11-23 02:41:36,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 02:41:36,113 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:36,113 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:36,113 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-23 02:41:36,113 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:36,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:36,114 INFO L85 PathProgramCache]: Analyzing trace with hash -730060381, now seen corresponding path program 1 times [2021-11-23 02:41:36,114 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:36,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1590573958] [2021-11-23 02:41:36,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:36,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:36,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:36,206 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 02:41:36,206 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:36,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1590573958] [2021-11-23 02:41:36,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1590573958] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:41:36,209 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:41:36,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:41:36,210 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761413927] [2021-11-23 02:41:36,210 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:36,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:41:36,211 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:36,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:41:36,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:41:36,212 INFO L87 Difference]: Start difference. First operand 152 states and 219 transitions. Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:38,225 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:41:38,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:38,654 INFO L93 Difference]: Finished difference Result 306 states and 441 transitions. [2021-11-23 02:41:38,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:41:38,656 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-23 02:41:38,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:38,657 INFO L225 Difference]: With dead ends: 306 [2021-11-23 02:41:38,657 INFO L226 Difference]: Without dead ends: 166 [2021-11-23 02:41:38,658 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 02:41:38,658 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 27 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 335 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:38,659 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 335 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 161 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:41:38,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-23 02:41:38,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 152. [2021-11-23 02:41:38,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 151 states have (on average 1.4437086092715232) internal successors, (218), 151 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:38,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 218 transitions. [2021-11-23 02:41:38,669 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 218 transitions. Word has length 57 [2021-11-23 02:41:38,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:38,669 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 218 transitions. [2021-11-23 02:41:38,670 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:38,670 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 218 transitions. [2021-11-23 02:41:38,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 02:41:38,671 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:38,671 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:38,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-23 02:41:38,672 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:38,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:38,672 INFO L85 PathProgramCache]: Analyzing trace with hash 454217721, now seen corresponding path program 1 times [2021-11-23 02:41:38,673 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:38,673 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349088835] [2021-11-23 02:41:38,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:38,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:38,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:38,749 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 02:41:38,749 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:38,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349088835] [2021-11-23 02:41:38,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1349088835] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:41:38,750 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:41:38,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:41:38,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828657604] [2021-11-23 02:41:38,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:38,751 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:41:38,751 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:38,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:41:38,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:41:38,753 INFO L87 Difference]: Start difference. First operand 152 states and 218 transitions. Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:40,767 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 02:41:41,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:41,137 INFO L93 Difference]: Finished difference Result 304 states and 437 transitions. [2021-11-23 02:41:41,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:41:41,139 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-23 02:41:41,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:41,141 INFO L225 Difference]: With dead ends: 304 [2021-11-23 02:41:41,141 INFO L226 Difference]: Without dead ends: 164 [2021-11-23 02:41:41,142 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 02:41:41,142 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 22 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 339 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:41,143 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 339 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 157 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:41:41,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-11-23 02:41:41,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 152. [2021-11-23 02:41:41,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 151 states have (on average 1.4370860927152318) internal successors, (217), 151 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:41,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 217 transitions. [2021-11-23 02:41:41,152 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 217 transitions. Word has length 57 [2021-11-23 02:41:41,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:41,152 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 217 transitions. [2021-11-23 02:41:41,153 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:41,153 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 217 transitions. [2021-11-23 02:41:41,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-23 02:41:41,154 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:41,154 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:41,155 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-23 02:41:41,155 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:41,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:41,156 INFO L85 PathProgramCache]: Analyzing trace with hash -1996067460, now seen corresponding path program 1 times [2021-11-23 02:41:41,156 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:41,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [749653412] [2021-11-23 02:41:41,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:41,157 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:41,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:41,259 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 02:41:41,260 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:41,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [749653412] [2021-11-23 02:41:41,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [749653412] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:41:41,260 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:41:41,261 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:41:41,261 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017655261] [2021-11-23 02:41:41,261 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:41,262 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:41:41,262 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:41,262 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:41:41,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:41:41,263 INFO L87 Difference]: Start difference. First operand 152 states and 217 transitions. Second operand has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:43,277 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 02:41:43,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:43,710 INFO L93 Difference]: Finished difference Result 304 states and 435 transitions. [2021-11-23 02:41:43,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:41:43,713 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-23 02:41:43,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:43,714 INFO L225 Difference]: With dead ends: 304 [2021-11-23 02:41:43,715 INFO L226 Difference]: Without dead ends: 164 [2021-11-23 02:41:43,715 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 02:41:43,716 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 24 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 339 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:43,716 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 339 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 157 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:41:43,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-11-23 02:41:43,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 152. [2021-11-23 02:41:43,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 151 states have (on average 1.4304635761589404) internal successors, (216), 151 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:43,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 216 transitions. [2021-11-23 02:41:43,725 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 216 transitions. Word has length 58 [2021-11-23 02:41:43,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:43,726 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 216 transitions. [2021-11-23 02:41:43,726 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:43,727 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 216 transitions. [2021-11-23 02:41:43,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-23 02:41:43,728 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:43,728 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:43,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-23 02:41:43,728 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:43,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:43,729 INFO L85 PathProgramCache]: Analyzing trace with hash -938752440, now seen corresponding path program 1 times [2021-11-23 02:41:43,730 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:43,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [188980631] [2021-11-23 02:41:43,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:43,730 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:43,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:43,801 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 02:41:43,802 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:43,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [188980631] [2021-11-23 02:41:43,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [188980631] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:41:43,803 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:41:43,803 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:41:43,803 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843120194] [2021-11-23 02:41:43,803 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:43,804 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:41:43,804 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:43,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:41:43,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:41:43,805 INFO L87 Difference]: Start difference. First operand 152 states and 216 transitions. Second operand has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:45,821 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 02:41:46,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:46,197 INFO L93 Difference]: Finished difference Result 296 states and 424 transitions. [2021-11-23 02:41:46,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:41:46,200 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-23 02:41:46,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:46,201 INFO L225 Difference]: With dead ends: 296 [2021-11-23 02:41:46,201 INFO L226 Difference]: Without dead ends: 156 [2021-11-23 02:41:46,202 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 02:41:46,203 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 18 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:46,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 347 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 149 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:41:46,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-11-23 02:41:46,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 152. [2021-11-23 02:41:46,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 151 states have (on average 1.423841059602649) internal successors, (215), 151 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:46,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 215 transitions. [2021-11-23 02:41:46,212 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 215 transitions. Word has length 59 [2021-11-23 02:41:46,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:46,212 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 215 transitions. [2021-11-23 02:41:46,213 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:46,213 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 215 transitions. [2021-11-23 02:41:46,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 02:41:46,214 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:46,214 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:41:46,214 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-23 02:41:46,215 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:46,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:46,215 INFO L85 PathProgramCache]: Analyzing trace with hash 825321039, now seen corresponding path program 1 times [2021-11-23 02:41:46,216 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:46,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615704998] [2021-11-23 02:41:46,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:46,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:46,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:46,318 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 02:41:46,318 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:46,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615704998] [2021-11-23 02:41:46,319 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1615704998] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:41:46,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2122482328] [2021-11-23 02:41:46,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:46,320 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:41:46,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:41:46,324 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:41:46,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:41:46,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:46,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:41:46,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:41:46,874 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 02:41:46,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:41:47,169 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 02:41:47,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2122482328] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:41:47,170 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:41:47,170 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4, 4] total 5 [2021-11-23 02:41:47,171 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136796692] [2021-11-23 02:41:47,171 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:47,171 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:41:47,172 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:47,172 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:41:47,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:41:47,173 INFO L87 Difference]: Start difference. First operand 152 states and 215 transitions. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 2 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:49,187 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 02:41:49,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:49,349 INFO L93 Difference]: Finished difference Result 292 states and 417 transitions. [2021-11-23 02:41:49,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:41:49,352 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 2 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2021-11-23 02:41:49,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:49,354 INFO L225 Difference]: With dead ends: 292 [2021-11-23 02:41:49,354 INFO L226 Difference]: Without dead ends: 290 [2021-11-23 02:41:49,355 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:41:49,356 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 116 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:49,356 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 276 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 38 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2021-11-23 02:41:49,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2021-11-23 02:41:49,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 286. [2021-11-23 02:41:49,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 285 states have (on average 1.4456140350877194) internal successors, (412), 285 states have internal predecessors, (412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:49,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 412 transitions. [2021-11-23 02:41:49,378 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 412 transitions. Word has length 62 [2021-11-23 02:41:49,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:49,379 INFO L470 AbstractCegarLoop]: Abstraction has 286 states and 412 transitions. [2021-11-23 02:41:49,379 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 2 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:49,379 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 412 transitions. [2021-11-23 02:41:49,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 02:41:49,381 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:49,381 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] [2021-11-23 02:41:49,436 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:41:49,606 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:41:49,607 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:49,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:49,607 INFO L85 PathProgramCache]: Analyzing trace with hash -795916946, now seen corresponding path program 1 times [2021-11-23 02:41:49,607 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:49,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1474301646] [2021-11-23 02:41:49,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:49,608 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:49,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:49,709 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 02:41:49,709 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:49,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1474301646] [2021-11-23 02:41:49,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1474301646] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:41:49,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [647661938] [2021-11-23 02:41:49,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:49,710 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:41:49,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:41:49,712 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:41:49,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:41:49,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:49,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:41:49,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:41:50,174 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 02:41:50,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:41:50,432 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 02:41:50,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [647661938] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:41:50,432 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:41:50,433 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4, 4] total 5 [2021-11-23 02:41:50,433 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585151168] [2021-11-23 02:41:50,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:41:50,433 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:41:50,434 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:41:50,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:41:50,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:41:50,435 INFO L87 Difference]: Start difference. First operand 286 states and 412 transitions. Second operand has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 2 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:52,455 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 02:41:52,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:41:52,606 INFO L93 Difference]: Finished difference Result 556 states and 807 transitions. [2021-11-23 02:41:52,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:41:52,607 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 2 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-23 02:41:52,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:41:52,612 INFO L225 Difference]: With dead ends: 556 [2021-11-23 02:41:52,612 INFO L226 Difference]: Without dead ends: 554 [2021-11-23 02:41:52,612 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 134 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 02:41:52,613 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 111 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:41:52,614 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 274 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 35 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2021-11-23 02:41:52,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2021-11-23 02:41:52,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 540. [2021-11-23 02:41:52,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 540 states, 539 states have (on average 1.4564007421150278) internal successors, (785), 539 states have internal predecessors, (785), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:52,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 540 states to 540 states and 785 transitions. [2021-11-23 02:41:52,643 INFO L78 Accepts]: Start accepts. Automaton has 540 states and 785 transitions. Word has length 68 [2021-11-23 02:41:52,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:41:52,643 INFO L470 AbstractCegarLoop]: Abstraction has 540 states and 785 transitions. [2021-11-23 02:41:52,643 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 2 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:41:52,644 INFO L276 IsEmpty]: Start isEmpty. Operand 540 states and 785 transitions. [2021-11-23 02:41:52,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 02:41:52,646 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:41:52,646 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:41:52,691 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:41:52,882 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:41:52,883 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:41:52,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:41:52,883 INFO L85 PathProgramCache]: Analyzing trace with hash -2143806460, now seen corresponding path program 1 times [2021-11-23 02:41:52,883 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:41:52,884 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [932608400] [2021-11-23 02:41:52,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:52,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:41:52,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:53,099 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:41:53,099 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:41:53,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [932608400] [2021-11-23 02:41:53,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [932608400] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:41:53,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842886170] [2021-11-23 02:41:53,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:41:53,102 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:41:53,102 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:41:53,107 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:41:53,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f2ac7fa-f499-410c-8e4d-c996c9685e98/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:41:53,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:41:53,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:41:53,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:41:53,700 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:41:53,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:41:54,420 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:41:54,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842886170] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:41:54,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [79298855] [2021-11-23 02:41:54,456 INFO L159 IcfgInterpreter]: Started Sifa with 54 locations of interest [2021-11-23 02:41:54,456 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:41:54,463 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:41:54,470 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:41:54,471 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs