./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.4.1.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.4.1.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 3fcf713e89fe507946e50cd7ac5d1f3269c91b4606b9da766f31c3632a8650aa --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:12:24,138 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:12:24,145 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:12:24,193 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:12:24,194 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:12:24,195 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:12:24,198 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:12:24,200 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:12:24,203 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:12:24,204 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:12:24,206 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:12:24,208 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:12:24,208 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:12:24,210 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:12:24,212 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:12:24,214 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:12:24,215 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:12:24,216 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:12:24,219 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:12:24,222 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:12:24,224 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:12:24,226 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:12:24,227 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:12:24,228 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:12:24,233 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:12:24,233 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:12:24,239 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:12:24,241 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:12:24,243 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:12:24,244 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:12:24,246 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:12:24,247 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:12:24,251 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:12:24,253 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:12:24,255 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:12:24,256 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:12:24,257 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:12:24,258 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:12:24,258 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:12:24,259 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:12:24,260 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:12:24,262 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:12:24,316 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:12:24,316 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:12:24,317 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:12:24,317 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:12:24,325 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:12:24,326 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:12:24,326 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:12:24,326 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:12:24,327 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:12:24,327 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:12:24,328 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:12:24,329 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:12:24,329 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:12:24,329 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:12:24,330 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:12:24,330 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:12:24,330 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:12:24,331 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:12:24,332 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:12:24,332 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:12:24,332 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:12:24,333 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:12:24,333 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:12:24,333 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:12:24,333 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:12:24,334 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:12:24,336 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:12:24,336 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:12:24,337 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:12:24,337 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:12:24,339 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:12:24,339 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:12:24,339 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:12:24,340 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:12:24,340 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:12:24,340 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:12:24,341 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:12:24,341 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:12:24,341 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:12:24,342 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:12:24,342 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:12:24,342 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_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3fcf713e89fe507946e50cd7ac5d1f3269c91b4606b9da766f31c3632a8650aa [2021-11-25 19:12:24,669 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:12:24,707 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:12:24,711 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:12:24,712 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:12:24,713 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:12:24,715 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.4.1.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-25 19:12:24,798 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/data/adea6433a/c7d703feec644c6083be73b17af2a8ec/FLAG57ce7261b [2021-11-25 19:12:25,564 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:12:25,565 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.4.1.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-25 19:12:25,584 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/data/adea6433a/c7d703feec644c6083be73b17af2a8ec/FLAG57ce7261b [2021-11-25 19:12:25,752 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/data/adea6433a/c7d703feec644c6083be73b17af2a8ec [2021-11-25 19:12:25,757 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:12:25,759 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:12:25,763 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:12:25,763 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:12:25,768 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:12:25,769 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:12:25" (1/1) ... [2021-11-25 19:12:25,771 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6be863d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:12:25, skipping insertion in model container [2021-11-25 19:12:25,772 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:12:25" (1/1) ... [2021-11-25 19:12:25,781 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:12:25,852 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:12:26,202 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_df1fecea-0f35-4fee-a041-efc6692e6b04/sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.4.1.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c[12650,12663] [2021-11-25 19:12:26,271 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:12:26,285 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:12:26,389 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_df1fecea-0f35-4fee-a041-efc6692e6b04/sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.4.1.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c[12650,12663] [2021-11-25 19:12:26,461 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:12:26,491 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:12:26,491 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:12:26 WrapperNode [2021-11-25 19:12:26,492 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:12:26,493 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:12:26,493 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:12:26,493 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:12:26,500 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:12:26" (1/1) ... [2021-11-25 19:12:26,517 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:12:26" (1/1) ... [2021-11-25 19:12:26,583 INFO L137 Inliner]: procedures = 24, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 1261 [2021-11-25 19:12:26,586 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:12:26,587 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:12:26,587 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:12:26,587 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:12:26,594 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:12:26" (1/1) ... [2021-11-25 19:12:26,594 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:12:26" (1/1) ... [2021-11-25 19:12:26,599 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:12:26" (1/1) ... [2021-11-25 19:12:26,599 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:12:26" (1/1) ... [2021-11-25 19:12:26,618 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:12:26" (1/1) ... [2021-11-25 19:12:26,645 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:12:26" (1/1) ... [2021-11-25 19:12:26,648 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:12:26" (1/1) ... [2021-11-25 19:12:26,655 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:12:26,656 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:12:26,656 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:12:26,656 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:12:26,677 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:12:26" (1/1) ... [2021-11-25 19:12:26,684 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:12:26,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:12:26,716 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:12:26,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:12:26,761 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:12:26,761 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:12:26,762 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:12:26,762 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:12:26,978 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:12:26,996 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:12:27,999 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:12:28,299 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:12:28,299 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-25 19:12:28,302 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:12:28 BoogieIcfgContainer [2021-11-25 19:12:28,302 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:12:28,304 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:12:28,304 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:12:28,307 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:12:28,307 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:12:25" (1/3) ... [2021-11-25 19:12:28,308 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3998d354 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:12:28, skipping insertion in model container [2021-11-25 19:12:28,308 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:12:26" (2/3) ... [2021-11-25 19:12:28,308 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3998d354 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:12:28, skipping insertion in model container [2021-11-25 19:12:28,308 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:12:28" (3/3) ... [2021-11-25 19:12:28,309 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_floodmax.4.1.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-25 19:12:28,314 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:12:28,315 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:12:28,361 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:12:28,367 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 19:12:28,368 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:12:28,387 INFO L276 IsEmpty]: Start isEmpty. Operand has 243 states, 241 states have (on average 1.6639004149377594) internal successors, (401), 242 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:28,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-25 19:12:28,400 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:28,400 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:28,401 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:28,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:28,406 INFO L85 PathProgramCache]: Analyzing trace with hash -1791153164, now seen corresponding path program 1 times [2021-11-25 19:12:28,414 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:28,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996005582] [2021-11-25 19:12:28,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:28,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:28,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:28,866 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:12:28,866 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:28,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996005582] [2021-11-25 19:12:28,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996005582] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:28,868 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:12:28,868 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:12:28,869 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698225363] [2021-11-25 19:12:28,870 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:28,874 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:12:28,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:28,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:12:28,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:28,904 INFO L87 Difference]: Start difference. First operand has 243 states, 241 states have (on average 1.6639004149377594) internal successors, (401), 242 states have internal predecessors, (401), 0 states have call successors, (0), 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 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:29,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:29,145 INFO L93 Difference]: Finished difference Result 408 states and 666 transitions. [2021-11-25 19:12:29,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:12:29,148 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 89 [2021-11-25 19:12:29,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:29,163 INFO L225 Difference]: With dead ends: 408 [2021-11-25 19:12:29,163 INFO L226 Difference]: Without dead ends: 313 [2021-11-25 19:12:29,166 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:29,169 INFO L933 BasicCegarLoop]: 479 mSDtfsCounter, 147 mSDsluCounter, 360 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 810 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:29,170 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [147 Valid, 810 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:12:29,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2021-11-25 19:12:29,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 311. [2021-11-25 19:12:29,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 311 states, 310 states have (on average 1.5580645161290323) internal successors, (483), 310 states have internal predecessors, (483), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:29,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 483 transitions. [2021-11-25 19:12:29,234 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 483 transitions. Word has length 89 [2021-11-25 19:12:29,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:29,235 INFO L470 AbstractCegarLoop]: Abstraction has 311 states and 483 transitions. [2021-11-25 19:12:29,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:29,235 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 483 transitions. [2021-11-25 19:12:29,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-11-25 19:12:29,241 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:29,241 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:29,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 19:12:29,242 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:29,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:29,242 INFO L85 PathProgramCache]: Analyzing trace with hash -727100931, now seen corresponding path program 1 times [2021-11-25 19:12:29,243 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:29,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1249820941] [2021-11-25 19:12:29,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:29,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:29,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:29,494 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:12:29,495 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:29,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1249820941] [2021-11-25 19:12:29,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1249820941] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:29,496 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:12:29,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:12:29,497 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472013398] [2021-11-25 19:12:29,497 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:29,500 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:12:29,500 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:29,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:12:29,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:29,501 INFO L87 Difference]: Start difference. First operand 311 states and 483 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:29,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:29,673 INFO L93 Difference]: Finished difference Result 559 states and 885 transitions. [2021-11-25 19:12:29,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:12:29,674 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 91 [2021-11-25 19:12:29,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:29,680 INFO L225 Difference]: With dead ends: 559 [2021-11-25 19:12:29,680 INFO L226 Difference]: Without dead ends: 400 [2021-11-25 19:12:29,686 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:29,689 INFO L933 BasicCegarLoop]: 334 mSDtfsCounter, 136 mSDsluCounter, 336 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 643 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:29,689 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 643 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:12:29,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2021-11-25 19:12:29,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 398. [2021-11-25 19:12:29,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 398 states, 397 states have (on average 1.5642317380352644) internal successors, (621), 397 states have internal predecessors, (621), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:29,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 621 transitions. [2021-11-25 19:12:29,733 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 621 transitions. Word has length 91 [2021-11-25 19:12:29,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:29,734 INFO L470 AbstractCegarLoop]: Abstraction has 398 states and 621 transitions. [2021-11-25 19:12:29,734 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:29,735 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 621 transitions. [2021-11-25 19:12:29,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-25 19:12:29,739 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:29,740 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:29,740 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 19:12:29,740 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:29,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:29,741 INFO L85 PathProgramCache]: Analyzing trace with hash 2006695004, now seen corresponding path program 1 times [2021-11-25 19:12:29,741 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:29,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123863171] [2021-11-25 19:12:29,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:29,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:29,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:29,878 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:12:29,879 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:29,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123863171] [2021-11-25 19:12:29,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [123863171] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:29,881 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:12:29,881 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:12:29,882 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90625597] [2021-11-25 19:12:29,882 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:29,884 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:12:29,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:29,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:12:29,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:29,885 INFO L87 Difference]: Start difference. First operand 398 states and 621 transitions. Second operand has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:30,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:30,026 INFO L93 Difference]: Finished difference Result 837 states and 1332 transitions. [2021-11-25 19:12:30,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:12:30,028 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2021-11-25 19:12:30,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:30,034 INFO L225 Difference]: With dead ends: 837 [2021-11-25 19:12:30,035 INFO L226 Difference]: Without dead ends: 592 [2021-11-25 19:12:30,038 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:30,047 INFO L933 BasicCegarLoop]: 415 mSDtfsCounter, 136 mSDsluCounter, 334 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 721 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:30,047 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 721 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:12:30,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2021-11-25 19:12:30,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 590. [2021-11-25 19:12:30,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 590 states, 589 states have (on average 1.5823429541595926) internal successors, (932), 589 states have internal predecessors, (932), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:30,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 590 states to 590 states and 932 transitions. [2021-11-25 19:12:30,080 INFO L78 Accepts]: Start accepts. Automaton has 590 states and 932 transitions. Word has length 94 [2021-11-25 19:12:30,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:30,080 INFO L470 AbstractCegarLoop]: Abstraction has 590 states and 932 transitions. [2021-11-25 19:12:30,081 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:30,081 INFO L276 IsEmpty]: Start isEmpty. Operand 590 states and 932 transitions. [2021-11-25 19:12:30,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-25 19:12:30,085 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:30,085 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:30,085 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 19:12:30,085 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:30,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:30,086 INFO L85 PathProgramCache]: Analyzing trace with hash 1727106365, now seen corresponding path program 1 times [2021-11-25 19:12:30,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:30,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828914891] [2021-11-25 19:12:30,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:30,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:30,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:30,195 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:12:30,195 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:30,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [828914891] [2021-11-25 19:12:30,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [828914891] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:30,196 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:12:30,196 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:12:30,196 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132196425] [2021-11-25 19:12:30,196 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:30,197 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:12:30,197 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:30,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:12:30,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:30,198 INFO L87 Difference]: Start difference. First operand 590 states and 932 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:30,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:30,330 INFO L93 Difference]: Finished difference Result 1290 states and 2062 transitions. [2021-11-25 19:12:30,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:12:30,331 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2021-11-25 19:12:30,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:30,337 INFO L225 Difference]: With dead ends: 1290 [2021-11-25 19:12:30,337 INFO L226 Difference]: Without dead ends: 853 [2021-11-25 19:12:30,338 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:30,345 INFO L933 BasicCegarLoop]: 343 mSDtfsCounter, 135 mSDsluCounter, 344 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 659 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:30,347 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 659 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:12:30,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 853 states. [2021-11-25 19:12:30,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 853 to 851. [2021-11-25 19:12:30,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 851 states, 850 states have (on average 1.5894117647058823) internal successors, (1351), 850 states have internal predecessors, (1351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:30,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 851 states to 851 states and 1351 transitions. [2021-11-25 19:12:30,394 INFO L78 Accepts]: Start accepts. Automaton has 851 states and 1351 transitions. Word has length 96 [2021-11-25 19:12:30,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:30,396 INFO L470 AbstractCegarLoop]: Abstraction has 851 states and 1351 transitions. [2021-11-25 19:12:30,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:30,396 INFO L276 IsEmpty]: Start isEmpty. Operand 851 states and 1351 transitions. [2021-11-25 19:12:30,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-25 19:12:30,398 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:30,399 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:30,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 19:12:30,399 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:30,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:30,409 INFO L85 PathProgramCache]: Analyzing trace with hash -158699486, now seen corresponding path program 1 times [2021-11-25 19:12:30,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:30,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1604165557] [2021-11-25 19:12:30,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:30,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:30,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:30,541 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:12:30,541 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:30,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1604165557] [2021-11-25 19:12:30,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1604165557] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:30,542 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:12:30,542 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:12:30,542 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321140307] [2021-11-25 19:12:30,542 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:30,544 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:12:30,544 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:30,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:12:30,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:30,546 INFO L87 Difference]: Start difference. First operand 851 states and 1351 transitions. Second operand has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:30,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:30,708 INFO L93 Difference]: Finished difference Result 2058 states and 3306 transitions. [2021-11-25 19:12:30,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:12:30,709 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 99 [2021-11-25 19:12:30,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:30,717 INFO L225 Difference]: With dead ends: 2058 [2021-11-25 19:12:30,717 INFO L226 Difference]: Without dead ends: 1378 [2021-11-25 19:12:30,719 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:30,719 INFO L933 BasicCegarLoop]: 387 mSDtfsCounter, 130 mSDsluCounter, 335 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 694 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:30,721 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 694 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:12:30,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1378 states. [2021-11-25 19:12:30,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1378 to 1376. [2021-11-25 19:12:30,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1376 states, 1375 states have (on average 1.5978181818181818) internal successors, (2197), 1375 states have internal predecessors, (2197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:30,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1376 states to 1376 states and 2197 transitions. [2021-11-25 19:12:30,835 INFO L78 Accepts]: Start accepts. Automaton has 1376 states and 2197 transitions. Word has length 99 [2021-11-25 19:12:30,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:30,836 INFO L470 AbstractCegarLoop]: Abstraction has 1376 states and 2197 transitions. [2021-11-25 19:12:30,836 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:30,837 INFO L276 IsEmpty]: Start isEmpty. Operand 1376 states and 2197 transitions. [2021-11-25 19:12:30,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-25 19:12:30,843 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:30,843 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:30,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 19:12:30,844 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:30,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:30,846 INFO L85 PathProgramCache]: Analyzing trace with hash 1123710545, now seen corresponding path program 1 times [2021-11-25 19:12:30,846 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:30,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044323343] [2021-11-25 19:12:30,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:30,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:30,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:30,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:12:30,930 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:30,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044323343] [2021-11-25 19:12:30,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1044323343] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:30,930 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:12:30,930 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:12:30,930 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272097736] [2021-11-25 19:12:30,931 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:30,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:12:30,931 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:30,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:12:30,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:30,932 INFO L87 Difference]: Start difference. First operand 1376 states and 2197 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:31,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:31,134 INFO L93 Difference]: Finished difference Result 3279 states and 5268 transitions. [2021-11-25 19:12:31,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:12:31,135 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 101 [2021-11-25 19:12:31,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:31,148 INFO L225 Difference]: With dead ends: 3279 [2021-11-25 19:12:31,148 INFO L226 Difference]: Without dead ends: 2074 [2021-11-25 19:12:31,151 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:31,152 INFO L933 BasicCegarLoop]: 344 mSDtfsCounter, 129 mSDsluCounter, 345 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 661 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:31,152 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 661 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:12:31,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2074 states. [2021-11-25 19:12:31,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2074 to 2072. [2021-11-25 19:12:31,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2072 states, 2071 states have (on average 1.5997102848865283) internal successors, (3313), 2071 states have internal predecessors, (3313), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:31,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2072 states to 2072 states and 3313 transitions. [2021-11-25 19:12:31,327 INFO L78 Accepts]: Start accepts. Automaton has 2072 states and 3313 transitions. Word has length 101 [2021-11-25 19:12:31,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:31,328 INFO L470 AbstractCegarLoop]: Abstraction has 2072 states and 3313 transitions. [2021-11-25 19:12:31,328 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:31,329 INFO L276 IsEmpty]: Start isEmpty. Operand 2072 states and 3313 transitions. [2021-11-25 19:12:31,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-25 19:12:31,330 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:31,331 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:31,331 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 19:12:31,331 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:31,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:31,332 INFO L85 PathProgramCache]: Analyzing trace with hash -1686559704, now seen corresponding path program 1 times [2021-11-25 19:12:31,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:31,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1521798535] [2021-11-25 19:12:31,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:31,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:31,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:31,411 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:12:31,411 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:31,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1521798535] [2021-11-25 19:12:31,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1521798535] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:31,412 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:12:31,412 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:12:31,412 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382926919] [2021-11-25 19:12:31,412 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:31,412 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:12:31,413 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:31,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:12:31,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:31,413 INFO L87 Difference]: Start difference. First operand 2072 states and 3313 transitions. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:31,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:31,736 INFO L93 Difference]: Finished difference Result 5379 states and 8652 transitions. [2021-11-25 19:12:31,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:12:31,737 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-25 19:12:31,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:31,759 INFO L225 Difference]: With dead ends: 5379 [2021-11-25 19:12:31,759 INFO L226 Difference]: Without dead ends: 3496 [2021-11-25 19:12:31,764 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:31,767 INFO L933 BasicCegarLoop]: 359 mSDtfsCounter, 124 mSDsluCounter, 336 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 667 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:31,767 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [124 Valid, 667 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:12:31,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3496 states. [2021-11-25 19:12:31,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3496 to 3494. [2021-11-25 19:12:31,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3494 states, 3493 states have (on average 1.6003435442313199) internal successors, (5590), 3493 states have internal predecessors, (5590), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:32,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3494 states to 3494 states and 5590 transitions. [2021-11-25 19:12:32,016 INFO L78 Accepts]: Start accepts. Automaton has 3494 states and 5590 transitions. Word has length 104 [2021-11-25 19:12:32,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:32,016 INFO L470 AbstractCegarLoop]: Abstraction has 3494 states and 5590 transitions. [2021-11-25 19:12:32,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:32,017 INFO L276 IsEmpty]: Start isEmpty. Operand 3494 states and 5590 transitions. [2021-11-25 19:12:32,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-25 19:12:32,020 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:32,020 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:32,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 19:12:32,020 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:32,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:32,022 INFO L85 PathProgramCache]: Analyzing trace with hash 1560949449, now seen corresponding path program 1 times [2021-11-25 19:12:32,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:32,022 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1791385965] [2021-11-25 19:12:32,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:32,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:32,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:32,112 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:12:32,112 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:32,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1791385965] [2021-11-25 19:12:32,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1791385965] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:32,113 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:12:32,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:12:32,113 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708163527] [2021-11-25 19:12:32,113 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:32,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:12:32,115 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:32,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:12:32,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:32,116 INFO L87 Difference]: Start difference. First operand 3494 states and 5590 transitions. Second operand has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:32,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:32,509 INFO L93 Difference]: Finished difference Result 8700 states and 13962 transitions. [2021-11-25 19:12:32,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:12:32,510 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 106 [2021-11-25 19:12:32,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:32,544 INFO L225 Difference]: With dead ends: 8700 [2021-11-25 19:12:32,546 INFO L226 Difference]: Without dead ends: 5395 [2021-11-25 19:12:32,552 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:32,553 INFO L933 BasicCegarLoop]: 345 mSDtfsCounter, 123 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 663 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:32,554 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 663 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:12:32,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5395 states. [2021-11-25 19:12:32,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5395 to 5393. [2021-11-25 19:12:32,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5393 states, 5392 states have (on average 1.5992210682492582) internal successors, (8623), 5392 states have internal predecessors, (8623), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:32,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5393 states to 5393 states and 8623 transitions. [2021-11-25 19:12:32,923 INFO L78 Accepts]: Start accepts. Automaton has 5393 states and 8623 transitions. Word has length 106 [2021-11-25 19:12:32,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:32,925 INFO L470 AbstractCegarLoop]: Abstraction has 5393 states and 8623 transitions. [2021-11-25 19:12:32,925 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:32,925 INFO L276 IsEmpty]: Start isEmpty. Operand 5393 states and 8623 transitions. [2021-11-25 19:12:32,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-25 19:12:32,927 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:32,927 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:32,927 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 19:12:32,927 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:32,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:32,928 INFO L85 PathProgramCache]: Analyzing trace with hash -1036556746, now seen corresponding path program 1 times [2021-11-25 19:12:32,928 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:32,928 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [268425847] [2021-11-25 19:12:32,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:32,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:32,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:33,031 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:12:33,031 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:33,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [268425847] [2021-11-25 19:12:33,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [268425847] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:33,032 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:12:33,032 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:12:33,032 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308552894] [2021-11-25 19:12:33,032 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:33,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:12:33,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:33,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:12:33,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:12:33,034 INFO L87 Difference]: Start difference. First operand 5393 states and 8623 transitions. Second operand has 6 states, 6 states have (on average 18.166666666666668) internal successors, (109), 6 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:34,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:34,068 INFO L93 Difference]: Finished difference Result 13476 states and 21549 transitions. [2021-11-25 19:12:34,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 19:12:34,068 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.166666666666668) internal successors, (109), 6 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 109 [2021-11-25 19:12:34,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:34,121 INFO L225 Difference]: With dead ends: 13476 [2021-11-25 19:12:34,121 INFO L226 Difference]: Without dead ends: 8290 [2021-11-25 19:12:34,131 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-25 19:12:34,133 INFO L933 BasicCegarLoop]: 346 mSDtfsCounter, 1040 mSDsluCounter, 2815 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1040 SdHoareTripleChecker+Valid, 3045 SdHoareTripleChecker+Invalid, 387 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:34,133 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1040 Valid, 3045 Invalid, 387 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:12:34,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8290 states. [2021-11-25 19:12:34,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8290 to 8276. [2021-11-25 19:12:34,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8276 states, 8275 states have (on average 1.589728096676737) internal successors, (13155), 8275 states have internal predecessors, (13155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:34,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8276 states to 8276 states and 13155 transitions. [2021-11-25 19:12:34,727 INFO L78 Accepts]: Start accepts. Automaton has 8276 states and 13155 transitions. Word has length 109 [2021-11-25 19:12:34,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:34,728 INFO L470 AbstractCegarLoop]: Abstraction has 8276 states and 13155 transitions. [2021-11-25 19:12:34,728 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.166666666666668) internal successors, (109), 6 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:34,729 INFO L276 IsEmpty]: Start isEmpty. Operand 8276 states and 13155 transitions. [2021-11-25 19:12:34,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-25 19:12:34,730 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:34,730 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:34,731 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 19:12:34,731 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:34,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:34,732 INFO L85 PathProgramCache]: Analyzing trace with hash -2135550104, now seen corresponding path program 1 times [2021-11-25 19:12:34,732 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:34,732 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1227101785] [2021-11-25 19:12:34,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:34,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:34,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:34,820 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:12:34,820 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:34,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1227101785] [2021-11-25 19:12:34,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1227101785] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:34,821 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:12:34,821 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:12:34,821 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586091255] [2021-11-25 19:12:34,821 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:34,822 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:12:34,822 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:34,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:12:34,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:12:34,823 INFO L87 Difference]: Start difference. First operand 8276 states and 13155 transitions. Second operand has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:35,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:35,405 INFO L93 Difference]: Finished difference Result 16347 states and 26005 transitions. [2021-11-25 19:12:35,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:12:35,405 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 110 [2021-11-25 19:12:35,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:35,449 INFO L225 Difference]: With dead ends: 16347 [2021-11-25 19:12:35,449 INFO L226 Difference]: Without dead ends: 8278 [2021-11-25 19:12:35,464 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:12:35,465 INFO L933 BasicCegarLoop]: 335 mSDtfsCounter, 255 mSDsluCounter, 690 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 255 SdHoareTripleChecker+Valid, 970 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:35,466 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [255 Valid, 970 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:12:35,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8278 states. [2021-11-25 19:12:35,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8278 to 8276. [2021-11-25 19:12:35,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8276 states, 8275 states have (on average 1.585619335347432) internal successors, (13121), 8275 states have internal predecessors, (13121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:35,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8276 states to 8276 states and 13121 transitions. [2021-11-25 19:12:35,969 INFO L78 Accepts]: Start accepts. Automaton has 8276 states and 13121 transitions. Word has length 110 [2021-11-25 19:12:35,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:35,969 INFO L470 AbstractCegarLoop]: Abstraction has 8276 states and 13121 transitions. [2021-11-25 19:12:35,970 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:35,970 INFO L276 IsEmpty]: Start isEmpty. Operand 8276 states and 13121 transitions. [2021-11-25 19:12:35,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-25 19:12:35,971 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:35,972 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:35,972 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 19:12:35,972 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:35,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:35,973 INFO L85 PathProgramCache]: Analyzing trace with hash -1840047811, now seen corresponding path program 1 times [2021-11-25 19:12:35,973 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:35,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017825263] [2021-11-25 19:12:35,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:35,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:36,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:36,048 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:12:36,048 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:36,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017825263] [2021-11-25 19:12:36,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1017825263] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:36,049 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:12:36,049 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:12:36,049 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002610960] [2021-11-25 19:12:36,049 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:36,050 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:12:36,050 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:36,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:12:36,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:12:36,051 INFO L87 Difference]: Start difference. First operand 8276 states and 13121 transitions. Second operand has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:36,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:36,733 INFO L93 Difference]: Finished difference Result 16347 states and 25937 transitions. [2021-11-25 19:12:36,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:12:36,733 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2021-11-25 19:12:36,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:36,757 INFO L225 Difference]: With dead ends: 16347 [2021-11-25 19:12:36,757 INFO L226 Difference]: Without dead ends: 8278 [2021-11-25 19:12:36,771 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:12:36,771 INFO L933 BasicCegarLoop]: 339 mSDtfsCounter, 263 mSDsluCounter, 692 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 263 SdHoareTripleChecker+Valid, 976 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:36,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [263 Valid, 976 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:12:36,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8278 states. [2021-11-25 19:12:37,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8278 to 8276. [2021-11-25 19:12:37,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8276 states, 8275 states have (on average 1.5815105740181268) internal successors, (13087), 8275 states have internal predecessors, (13087), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:37,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8276 states to 8276 states and 13087 transitions. [2021-11-25 19:12:37,398 INFO L78 Accepts]: Start accepts. Automaton has 8276 states and 13087 transitions. Word has length 111 [2021-11-25 19:12:37,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:37,398 INFO L470 AbstractCegarLoop]: Abstraction has 8276 states and 13087 transitions. [2021-11-25 19:12:37,398 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:37,399 INFO L276 IsEmpty]: Start isEmpty. Operand 8276 states and 13087 transitions. [2021-11-25 19:12:37,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-25 19:12:37,400 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:37,400 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:37,400 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-25 19:12:37,401 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:37,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:37,401 INFO L85 PathProgramCache]: Analyzing trace with hash -1264853297, now seen corresponding path program 1 times [2021-11-25 19:12:37,401 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:37,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981858673] [2021-11-25 19:12:37,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:37,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:37,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:37,468 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:12:37,469 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:37,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981858673] [2021-11-25 19:12:37,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1981858673] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:37,469 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:12:37,469 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:12:37,470 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047205030] [2021-11-25 19:12:37,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:37,470 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:12:37,470 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:37,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:12:37,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:12:37,471 INFO L87 Difference]: Start difference. First operand 8276 states and 13087 transitions. Second operand has 4 states, 4 states have (on average 28.0) internal successors, (112), 4 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:38,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:38,069 INFO L93 Difference]: Finished difference Result 16347 states and 25869 transitions. [2021-11-25 19:12:38,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:12:38,069 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 28.0) internal successors, (112), 4 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-25 19:12:38,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:38,090 INFO L225 Difference]: With dead ends: 16347 [2021-11-25 19:12:38,090 INFO L226 Difference]: Without dead ends: 8278 [2021-11-25 19:12:38,100 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:12:38,101 INFO L933 BasicCegarLoop]: 340 mSDtfsCounter, 261 mSDsluCounter, 694 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 979 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:38,101 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [261 Valid, 979 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:12:38,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8278 states. [2021-11-25 19:12:38,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8278 to 8276. [2021-11-25 19:12:38,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8276 states, 8275 states have (on average 1.5774018126888218) internal successors, (13053), 8275 states have internal predecessors, (13053), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:38,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8276 states to 8276 states and 13053 transitions. [2021-11-25 19:12:38,550 INFO L78 Accepts]: Start accepts. Automaton has 8276 states and 13053 transitions. Word has length 112 [2021-11-25 19:12:38,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:38,550 INFO L470 AbstractCegarLoop]: Abstraction has 8276 states and 13053 transitions. [2021-11-25 19:12:38,551 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 28.0) internal successors, (112), 4 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:38,551 INFO L276 IsEmpty]: Start isEmpty. Operand 8276 states and 13053 transitions. [2021-11-25 19:12:38,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-25 19:12:38,552 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:38,553 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:38,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-25 19:12:38,553 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:38,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:38,554 INFO L85 PathProgramCache]: Analyzing trace with hash -609134524, now seen corresponding path program 1 times [2021-11-25 19:12:38,554 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:38,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [115909304] [2021-11-25 19:12:38,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:38,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:38,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:38,629 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:12:38,629 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:38,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [115909304] [2021-11-25 19:12:38,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [115909304] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:38,630 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:12:38,630 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:12:38,630 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451823110] [2021-11-25 19:12:38,630 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:38,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:12:38,631 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:38,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:12:38,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:12:38,632 INFO L87 Difference]: Start difference. First operand 8276 states and 13053 transitions. Second operand has 4 states, 4 states have (on average 28.25) internal successors, (113), 4 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:39,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:39,223 INFO L93 Difference]: Finished difference Result 16347 states and 25801 transitions. [2021-11-25 19:12:39,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:12:39,224 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 28.25) internal successors, (113), 4 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2021-11-25 19:12:39,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:39,244 INFO L225 Difference]: With dead ends: 16347 [2021-11-25 19:12:39,244 INFO L226 Difference]: Without dead ends: 8278 [2021-11-25 19:12:39,256 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:12:39,257 INFO L933 BasicCegarLoop]: 341 mSDtfsCounter, 259 mSDsluCounter, 696 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 982 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:39,257 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [259 Valid, 982 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:12:39,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8278 states. [2021-11-25 19:12:39,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8278 to 8276. [2021-11-25 19:12:39,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8276 states, 8275 states have (on average 1.5732930513595167) internal successors, (13019), 8275 states have internal predecessors, (13019), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:39,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8276 states to 8276 states and 13019 transitions. [2021-11-25 19:12:39,857 INFO L78 Accepts]: Start accepts. Automaton has 8276 states and 13019 transitions. Word has length 113 [2021-11-25 19:12:39,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:39,858 INFO L470 AbstractCegarLoop]: Abstraction has 8276 states and 13019 transitions. [2021-11-25 19:12:39,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 28.25) internal successors, (113), 4 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:39,858 INFO L276 IsEmpty]: Start isEmpty. Operand 8276 states and 13019 transitions. [2021-11-25 19:12:39,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-25 19:12:39,860 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:39,860 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:39,861 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-25 19:12:39,861 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:39,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:39,861 INFO L85 PathProgramCache]: Analyzing trace with hash 1514935861, now seen corresponding path program 1 times [2021-11-25 19:12:39,862 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:39,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [799268910] [2021-11-25 19:12:39,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:39,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:39,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:40,059 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:12:40,059 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:40,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [799268910] [2021-11-25 19:12:40,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [799268910] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:40,060 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:12:40,060 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:12:40,060 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643221841] [2021-11-25 19:12:40,060 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:40,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:12:40,061 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:40,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:12:40,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:12:40,062 INFO L87 Difference]: Start difference. First operand 8276 states and 13019 transitions. Second operand has 6 states, 6 states have (on average 19.166666666666668) internal successors, (115), 6 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:40,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:40,953 INFO L93 Difference]: Finished difference Result 16347 states and 25733 transitions. [2021-11-25 19:12:40,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:12:40,954 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 19.166666666666668) internal successors, (115), 6 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 115 [2021-11-25 19:12:40,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:40,975 INFO L225 Difference]: With dead ends: 16347 [2021-11-25 19:12:40,975 INFO L226 Difference]: Without dead ends: 8278 [2021-11-25 19:12:40,987 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:12:40,988 INFO L933 BasicCegarLoop]: 336 mSDtfsCounter, 338 mSDsluCounter, 1008 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 338 SdHoareTripleChecker+Valid, 1269 SdHoareTripleChecker+Invalid, 191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:40,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [338 Valid, 1269 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:12:41,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8278 states. [2021-11-25 19:12:41,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8278 to 8276. [2021-11-25 19:12:41,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8276 states, 8275 states have (on average 1.5713595166163141) internal successors, (13003), 8275 states have internal predecessors, (13003), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:41,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8276 states to 8276 states and 13003 transitions. [2021-11-25 19:12:41,575 INFO L78 Accepts]: Start accepts. Automaton has 8276 states and 13003 transitions. Word has length 115 [2021-11-25 19:12:41,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:41,576 INFO L470 AbstractCegarLoop]: Abstraction has 8276 states and 13003 transitions. [2021-11-25 19:12:41,576 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 19.166666666666668) internal successors, (115), 6 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:41,576 INFO L276 IsEmpty]: Start isEmpty. Operand 8276 states and 13003 transitions. [2021-11-25 19:12:41,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-25 19:12:41,578 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:41,578 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:41,578 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-25 19:12:41,578 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:41,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:41,579 INFO L85 PathProgramCache]: Analyzing trace with hash -2110499679, now seen corresponding path program 1 times [2021-11-25 19:12:41,579 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:41,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [708224236] [2021-11-25 19:12:41,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:41,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:41,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:41,763 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:12:41,763 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:41,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [708224236] [2021-11-25 19:12:41,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [708224236] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:41,764 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:12:41,764 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:12:41,764 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218387540] [2021-11-25 19:12:41,764 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:41,765 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:12:41,765 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:41,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:12:41,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:12:41,766 INFO L87 Difference]: Start difference. First operand 8276 states and 13003 transitions. Second operand has 6 states, 6 states have (on average 19.666666666666668) internal successors, (118), 6 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:42,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:42,610 INFO L93 Difference]: Finished difference Result 20541 states and 32197 transitions. [2021-11-25 19:12:42,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:12:42,611 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 19.666666666666668) internal successors, (118), 6 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 118 [2021-11-25 19:12:42,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:42,643 INFO L225 Difference]: With dead ends: 20541 [2021-11-25 19:12:42,643 INFO L226 Difference]: Without dead ends: 12472 [2021-11-25 19:12:42,657 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:12:42,658 INFO L933 BasicCegarLoop]: 341 mSDtfsCounter, 438 mSDsluCounter, 1029 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 438 SdHoareTripleChecker+Valid, 1298 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:42,658 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [438 Valid, 1298 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:12:42,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12472 states. [2021-11-25 19:12:43,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12472 to 12470. [2021-11-25 19:12:43,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12470 states, 12469 states have (on average 1.5618734461464432) internal successors, (19475), 12469 states have internal predecessors, (19475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:43,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12470 states to 12470 states and 19475 transitions. [2021-11-25 19:12:43,340 INFO L78 Accepts]: Start accepts. Automaton has 12470 states and 19475 transitions. Word has length 118 [2021-11-25 19:12:43,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:43,341 INFO L470 AbstractCegarLoop]: Abstraction has 12470 states and 19475 transitions. [2021-11-25 19:12:43,341 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 19.666666666666668) internal successors, (118), 6 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:43,341 INFO L276 IsEmpty]: Start isEmpty. Operand 12470 states and 19475 transitions. [2021-11-25 19:12:43,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-25 19:12:43,343 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:43,343 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:43,343 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-25 19:12:43,343 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:43,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:43,344 INFO L85 PathProgramCache]: Analyzing trace with hash -969702568, now seen corresponding path program 1 times [2021-11-25 19:12:43,344 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:43,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785194912] [2021-11-25 19:12:43,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:43,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:43,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:43,504 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:12:43,505 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:43,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [785194912] [2021-11-25 19:12:43,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [785194912] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:43,505 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:12:43,505 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:12:43,506 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807363017] [2021-11-25 19:12:43,506 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:43,506 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:12:43,506 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:43,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:12:43,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:12:43,507 INFO L87 Difference]: Start difference. First operand 12470 states and 19475 transitions. Second operand has 6 states, 6 states have (on average 19.833333333333332) internal successors, (119), 6 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:44,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:44,512 INFO L93 Difference]: Finished difference Result 15348 states and 23856 transitions. [2021-11-25 19:12:44,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 19:12:44,513 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 19.833333333333332) internal successors, (119), 6 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 119 [2021-11-25 19:12:44,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:44,547 INFO L225 Difference]: With dead ends: 15348 [2021-11-25 19:12:44,548 INFO L226 Difference]: Without dead ends: 15346 [2021-11-25 19:12:44,552 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:12:44,553 INFO L933 BasicCegarLoop]: 557 mSDtfsCounter, 369 mSDsluCounter, 1663 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 369 SdHoareTripleChecker+Valid, 2103 SdHoareTripleChecker+Invalid, 246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:44,553 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [369 Valid, 2103 Invalid, 246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:12:44,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15346 states. [2021-11-25 19:12:45,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15346 to 12484. [2021-11-25 19:12:45,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12484 states, 12483 states have (on average 1.5596411119122007) internal successors, (19469), 12483 states have internal predecessors, (19469), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:45,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12484 states to 12484 states and 19469 transitions. [2021-11-25 19:12:45,295 INFO L78 Accepts]: Start accepts. Automaton has 12484 states and 19469 transitions. Word has length 119 [2021-11-25 19:12:45,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:45,296 INFO L470 AbstractCegarLoop]: Abstraction has 12484 states and 19469 transitions. [2021-11-25 19:12:45,296 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 19.833333333333332) internal successors, (119), 6 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:45,296 INFO L276 IsEmpty]: Start isEmpty. Operand 12484 states and 19469 transitions. [2021-11-25 19:12:45,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-25 19:12:45,298 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:45,299 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:45,299 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-25 19:12:45,299 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:45,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:45,300 INFO L85 PathProgramCache]: Analyzing trace with hash 2050752886, now seen corresponding path program 1 times [2021-11-25 19:12:45,300 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:45,300 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285063837] [2021-11-25 19:12:45,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:45,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:45,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:46,077 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:12:46,078 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:46,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285063837] [2021-11-25 19:12:46,078 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [285063837] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:12:46,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1650509230] [2021-11-25 19:12:46,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:46,079 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:12:46,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:12:46,085 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:12:46,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:12:46,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:46,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 632 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:12:46,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:12:46,804 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:12:46,804 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:12:46,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1650509230] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:46,805 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:12:46,805 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [13] total 15 [2021-11-25 19:12:46,805 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452456592] [2021-11-25 19:12:46,806 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:46,806 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:12:46,806 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:46,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:12:46,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:12:46,807 INFO L87 Difference]: Start difference. First operand 12484 states and 19469 transitions. Second operand has 4 states, 4 states have (on average 31.25) internal successors, (125), 3 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:48,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:48,670 INFO L93 Difference]: Finished difference Result 36750 states and 57353 transitions. [2021-11-25 19:12:48,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:12:48,671 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 31.25) internal successors, (125), 3 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 127 [2021-11-25 19:12:48,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:48,714 INFO L225 Difference]: With dead ends: 36750 [2021-11-25 19:12:48,714 INFO L226 Difference]: Without dead ends: 24471 [2021-11-25 19:12:48,735 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2021-11-25 19:12:48,736 INFO L933 BasicCegarLoop]: 393 mSDtfsCounter, 793 mSDsluCounter, 350 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 793 SdHoareTripleChecker+Valid, 721 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:48,736 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [793 Valid, 721 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:12:48,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24471 states. [2021-11-25 19:12:50,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24471 to 24469. [2021-11-25 19:12:50,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24469 states, 24468 states have (on average 1.5560732385156122) internal successors, (38074), 24468 states have internal predecessors, (38074), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:50,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24469 states to 24469 states and 38074 transitions. [2021-11-25 19:12:50,166 INFO L78 Accepts]: Start accepts. Automaton has 24469 states and 38074 transitions. Word has length 127 [2021-11-25 19:12:50,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:50,166 INFO L470 AbstractCegarLoop]: Abstraction has 24469 states and 38074 transitions. [2021-11-25 19:12:50,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 31.25) internal successors, (125), 3 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:50,166 INFO L276 IsEmpty]: Start isEmpty. Operand 24469 states and 38074 transitions. [2021-11-25 19:12:50,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-25 19:12:50,168 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:50,168 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:50,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:12:50,371 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 19:12:50,372 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:50,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:50,373 INFO L85 PathProgramCache]: Analyzing trace with hash 2066299650, now seen corresponding path program 1 times [2021-11-25 19:12:50,373 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:50,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [331444592] [2021-11-25 19:12:50,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:50,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:50,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:50,472 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 19:12:50,472 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:50,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [331444592] [2021-11-25 19:12:50,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [331444592] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:50,473 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:12:50,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:12:50,473 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601101464] [2021-11-25 19:12:50,473 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:50,474 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:12:50,474 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:50,474 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:12:50,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:50,475 INFO L87 Difference]: Start difference. First operand 24469 states and 38074 transitions. Second operand has 3 states, 3 states have (on average 42.333333333333336) internal successors, (127), 3 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:53,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:53,257 INFO L93 Difference]: Finished difference Result 71785 states and 111776 transitions. [2021-11-25 19:12:53,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:12:53,258 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 42.333333333333336) internal successors, (127), 3 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 129 [2021-11-25 19:12:53,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:53,340 INFO L225 Difference]: With dead ends: 71785 [2021-11-25 19:12:53,340 INFO L226 Difference]: Without dead ends: 47404 [2021-11-25 19:12:53,367 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:53,367 INFO L933 BasicCegarLoop]: 621 mSDtfsCounter, 246 mSDsluCounter, 350 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 943 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:53,368 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [246 Valid, 943 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:12:53,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47404 states. [2021-11-25 19:12:56,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47404 to 47402. [2021-11-25 19:12:56,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47402 states, 47401 states have (on average 1.5497985274572266) internal successors, (73462), 47401 states have internal predecessors, (73462), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:56,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47402 states to 47402 states and 73462 transitions. [2021-11-25 19:12:56,776 INFO L78 Accepts]: Start accepts. Automaton has 47402 states and 73462 transitions. Word has length 129 [2021-11-25 19:12:56,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:56,776 INFO L470 AbstractCegarLoop]: Abstraction has 47402 states and 73462 transitions. [2021-11-25 19:12:56,776 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 42.333333333333336) internal successors, (127), 3 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:12:56,776 INFO L276 IsEmpty]: Start isEmpty. Operand 47402 states and 73462 transitions. [2021-11-25 19:12:56,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-25 19:12:56,778 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:56,779 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:56,779 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-25 19:12:56,779 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:56,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:56,780 INFO L85 PathProgramCache]: Analyzing trace with hash -2122052879, now seen corresponding path program 1 times [2021-11-25 19:12:56,780 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:56,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1151287602] [2021-11-25 19:12:56,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:56,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:56,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:12:56,829 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:12:56,829 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:56,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1151287602] [2021-11-25 19:12:56,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1151287602] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:12:56,830 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:12:56,830 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:12:56,830 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605693139] [2021-11-25 19:12:56,830 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:12:56,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:12:56,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:56,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:12:56,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:12:56,832 INFO L87 Difference]: Start difference. First operand 47402 states and 73462 transitions. Second operand has 3 states, 3 states have (on average 42.333333333333336) internal successors, (127), 3 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:13:02,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:13:02,845 INFO L93 Difference]: Finished difference Result 142113 states and 220236 transitions. [2021-11-25 19:13:02,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:13:02,846 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 42.333333333333336) internal successors, (127), 3 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 129 [2021-11-25 19:13:02,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:13:03,027 INFO L225 Difference]: With dead ends: 142113 [2021-11-25 19:13:03,027 INFO L226 Difference]: Without dead ends: 94759 [2021-11-25 19:13:03,092 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:13:03,093 INFO L933 BasicCegarLoop]: 336 mSDtfsCounter, 306 mSDsluCounter, 357 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 306 SdHoareTripleChecker+Valid, 664 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:13:03,093 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [306 Valid, 664 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:13:03,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94759 states. [2021-11-25 19:13:06,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94759 to 47416. [2021-11-25 19:13:06,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47416 states, 47415 states have (on average 1.5497205525677529) internal successors, (73480), 47415 states have internal predecessors, (73480), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:13:07,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47416 states to 47416 states and 73480 transitions. [2021-11-25 19:13:07,051 INFO L78 Accepts]: Start accepts. Automaton has 47416 states and 73480 transitions. Word has length 129 [2021-11-25 19:13:07,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:13:07,051 INFO L470 AbstractCegarLoop]: Abstraction has 47416 states and 73480 transitions. [2021-11-25 19:13:07,052 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 42.333333333333336) internal successors, (127), 3 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:13:07,052 INFO L276 IsEmpty]: Start isEmpty. Operand 47416 states and 73480 transitions. [2021-11-25 19:13:07,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-25 19:13:07,055 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:13:07,055 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:13:07,056 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-25 19:13:07,056 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:13:07,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:13:07,057 INFO L85 PathProgramCache]: Analyzing trace with hash -1364135696, now seen corresponding path program 1 times [2021-11-25 19:13:07,057 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:13:07,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [91028055] [2021-11-25 19:13:07,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:13:07,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:13:07,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:13:07,164 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:13:07,164 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:13:07,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [91028055] [2021-11-25 19:13:07,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [91028055] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:13:07,164 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:13:07,165 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:13:07,165 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242279369] [2021-11-25 19:13:07,165 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:13:07,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:13:07,166 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:13:07,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:13:07,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:13:07,166 INFO L87 Difference]: Start difference. First operand 47416 states and 73480 transitions. Second operand has 5 states, 5 states have (on average 25.6) internal successors, (128), 4 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:13:11,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:13:11,313 INFO L93 Difference]: Finished difference Result 94174 states and 146009 transitions. [2021-11-25 19:13:11,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:13:11,314 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 25.6) internal successors, (128), 4 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 130 [2021-11-25 19:13:11,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:13:11,393 INFO L225 Difference]: With dead ends: 94174 [2021-11-25 19:13:11,393 INFO L226 Difference]: Without dead ends: 47416 [2021-11-25 19:13:11,425 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:13:11,425 INFO L933 BasicCegarLoop]: 287 mSDtfsCounter, 585 mSDsluCounter, 405 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 585 SdHoareTripleChecker+Valid, 644 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:13:11,426 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [585 Valid, 644 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:13:11,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47416 states. [2021-11-25 19:13:15,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47416 to 47416. [2021-11-25 19:13:15,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47416 states, 47415 states have (on average 1.5258884319308237) internal successors, (72350), 47415 states have internal predecessors, (72350), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:13:15,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47416 states to 47416 states and 72350 transitions. [2021-11-25 19:13:15,483 INFO L78 Accepts]: Start accepts. Automaton has 47416 states and 72350 transitions. Word has length 130 [2021-11-25 19:13:15,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:13:15,484 INFO L470 AbstractCegarLoop]: Abstraction has 47416 states and 72350 transitions. [2021-11-25 19:13:15,484 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 25.6) internal successors, (128), 4 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:13:15,484 INFO L276 IsEmpty]: Start isEmpty. Operand 47416 states and 72350 transitions. [2021-11-25 19:13:15,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-25 19:13:15,487 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:13:15,487 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:13:15,488 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-25 19:13:15,488 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:13:15,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:13:15,488 INFO L85 PathProgramCache]: Analyzing trace with hash 154822123, now seen corresponding path program 1 times [2021-11-25 19:13:15,489 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:13:15,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255102007] [2021-11-25 19:13:15,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:13:15,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:13:15,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:13:15,972 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:13:15,972 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:13:15,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255102007] [2021-11-25 19:13:15,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255102007] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:13:15,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [525992788] [2021-11-25 19:13:15,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:13:15,973 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:13:15,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:13:15,974 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:13:15,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df1fecea-0f35-4fee-a041-efc6692e6b04/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:13:16,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:13:16,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 638 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:13:16,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:13:16,505 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:13:16,506 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:13:16,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [525992788] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:13:16,506 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:13:16,506 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [13] total 15 [2021-11-25 19:13:16,508 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889962194] [2021-11-25 19:13:16,508 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:13:16,509 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:13:16,509 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:13:16,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:13:16,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:13:16,510 INFO L87 Difference]: Start difference. First operand 47416 states and 72350 transitions. Second operand has 4 states, 4 states have (on average 32.0) internal successors, (128), 3 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)